EP3606893B1 - Capsaicinoid smoke - Google Patents
Capsaicinoid smoke Download PDFInfo
- Publication number
- EP3606893B1 EP3606893B1 EP18724372.0A EP18724372A EP3606893B1 EP 3606893 B1 EP3606893 B1 EP 3606893B1 EP 18724372 A EP18724372 A EP 18724372A EP 3606893 B1 EP3606893 B1 EP 3606893B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- smoke
- composition
- initiator
- reaction
- monomer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000779 smoke Substances 0.000 title claims description 199
- YKPUWZUDDOIDPM-SOFGYWHQSA-N capsaicin Chemical compound COC1=CC(CNC(=O)CCCC\C=C\C(C)C)=CC=C1O YKPUWZUDDOIDPM-SOFGYWHQSA-N 0.000 title claims description 55
- 239000003999 initiator Substances 0.000 claims description 89
- 239000000203 mixture Substances 0.000 claims description 88
- 239000000178 monomer Substances 0.000 claims description 63
- 150000001875 compounds Chemical class 0.000 claims description 48
- 238000006116 polymerization reaction Methods 0.000 claims description 29
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 230000000977 initiatory effect Effects 0.000 claims description 14
- 239000000945 filler Substances 0.000 claims description 13
- 229910021485 fumed silica Inorganic materials 0.000 claims description 12
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims description 8
- -1 capsaicinoid compound Chemical class 0.000 claims description 5
- 230000000622 irritating effect Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 239000012530 fluid Substances 0.000 claims 2
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 claims 2
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 claims 2
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims 1
- FGGJBCRKSVGDPO-UHFFFAOYSA-N hydroperoxycyclohexane Chemical compound OOC1CCCCC1 FGGJBCRKSVGDPO-UHFFFAOYSA-N 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 72
- 238000006243 chemical reaction Methods 0.000 description 69
- 239000000523 sample Substances 0.000 description 39
- 239000000463 material Substances 0.000 description 32
- 238000000354 decomposition reaction Methods 0.000 description 25
- 238000004519 manufacturing process Methods 0.000 description 24
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 21
- 229920000642 polymer Polymers 0.000 description 21
- 239000000047 product Substances 0.000 description 20
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 18
- 230000003287 optical effect Effects 0.000 description 17
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 16
- MEBONNVPKOBPEA-UHFFFAOYSA-N 1,1,2-trimethylcyclohexane Chemical class CC1CCCCC1(C)C MEBONNVPKOBPEA-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 230000007246 mechanism Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 229960002504 capsaicin Drugs 0.000 description 9
- 235000017663 capsaicin Nutrition 0.000 description 9
- 235000002566 Capsicum Nutrition 0.000 description 8
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 8
- 241000208293 Capsicum Species 0.000 description 7
- 239000001390 capsicum minimum Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000006227 byproduct Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- PYOLJOJPIPCRDP-UHFFFAOYSA-N 1,1,3-trimethylcyclohexane Chemical compound CC1CCCC(C)(C)C1 PYOLJOJPIPCRDP-UHFFFAOYSA-N 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- AKDLSISGGARWFP-UHFFFAOYSA-N Homodihydrocapsaicin Chemical compound COC1=CC(CNC(=O)CCCCCCCC(C)C)=CC=C1O AKDLSISGGARWFP-UHFFFAOYSA-N 0.000 description 4
- 231100000111 LD50 Toxicity 0.000 description 4
- VQEONGKQWIFHMN-UHFFFAOYSA-N Nordihydrocapsaicin Chemical compound COC1=CC(CNC(=O)CCCCCC(C)C)=CC=C1O VQEONGKQWIFHMN-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 4
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- 239000007795 chemical reaction product Substances 0.000 description 4
- 231100001261 hazardous Toxicity 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 229910001120 nichrome Inorganic materials 0.000 description 4
- RGOVYLWUIBMPGK-UHFFFAOYSA-N nonivamide Chemical compound CCCCCCCCC(=O)NCC1=CC=C(O)C(OC)=C1 RGOVYLWUIBMPGK-UHFFFAOYSA-N 0.000 description 4
- 239000008601 oleoresin Substances 0.000 description 4
- 230000037361 pathway Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 231100000419 toxicity Toxicity 0.000 description 4
- 230000001988 toxicity Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- QEQBMZQFDDDTPN-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy benzenecarboperoxoate Chemical compound CC(C)(C)OOOC(=O)C1=CC=CC=C1 QEQBMZQFDDDTPN-UHFFFAOYSA-N 0.000 description 3
- 241000282412 Homo Species 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- VHHHONWQHHHLTI-UHFFFAOYSA-N hexachloroethane Chemical compound ClC(Cl)(Cl)C(Cl)(Cl)Cl VHHHONWQHHHLTI-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002085 irritant Substances 0.000 description 3
- 231100000021 irritant Toxicity 0.000 description 3
- 210000004072 lung Anatomy 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical class CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- 238000001429 visible spectrum Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- NALFRYPTRXKZPN-UHFFFAOYSA-N 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane Chemical compound CC1CC(C)(C)CC(OOC(C)(C)C)(OOC(C)(C)C)C1 NALFRYPTRXKZPN-UHFFFAOYSA-N 0.000 description 2
- ODNRTOSCFYDTKF-UHFFFAOYSA-N 1,3,5-trimethylcyclohexane Chemical compound CC1CC(C)CC(C)C1 ODNRTOSCFYDTKF-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 2
- 239000005711 Benzoic acid Substances 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 2
- 206010006784 Burning sensation Diseases 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 241000124008 Mammalia Species 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 2
- 208000002193 Pain Diseases 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- SESFRYSPDFLNCH-UHFFFAOYSA-N benzyl benzoate Chemical compound C=1C=CC=CC=1C(=O)OCC1=CC=CC=C1 SESFRYSPDFLNCH-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001722 carbon compounds Chemical class 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 2
- 230000001684 chronic effect Effects 0.000 description 2
- 231100000762 chronic effect Toxicity 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- XJQPQKLURWNAAH-UHFFFAOYSA-N dihydrocapsaicin Chemical compound COC1=CC(CNC(=O)CCCCCCC(C)C)=CC=C1O XJQPQKLURWNAAH-UHFFFAOYSA-N 0.000 description 2
- RBCYRZPENADQGZ-UHFFFAOYSA-N dihydrocapsaicin Natural products COC1=CC(COC(=O)CCCCCCC(C)C)=CC=C1O RBCYRZPENADQGZ-UHFFFAOYSA-N 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 239000000469 ethanolic extract Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- MLJGZARGNROKAC-VQHVLOKHSA-N homocapsaicin Chemical compound CCC(C)\C=C\CCCCC(=O)NCC1=CC=C(O)C(OC)=C1 MLJGZARGNROKAC-VQHVLOKHSA-N 0.000 description 2
- JKIHLSTUOQHAFF-UHFFFAOYSA-N homocapsaicin Natural products COC1=CC(CNC(=O)CCCCCC=CC(C)C)=CC=C1O JKIHLSTUOQHAFF-UHFFFAOYSA-N 0.000 description 2
- JZNZUOZRIWOBGG-UHFFFAOYSA-N homocapsaicin-II Natural products COC1=CC(CNC(=O)CCCCC=CCC(C)C)=CC=C1O JZNZUOZRIWOBGG-UHFFFAOYSA-N 0.000 description 2
- GOBFKCLUUUDTQE-UHFFFAOYSA-N homodihydrocapsaicin-II Natural products CCC(C)CCCCCCC(=O)NCC1=CC=C(O)C(OC)=C1 GOBFKCLUUUDTQE-UHFFFAOYSA-N 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 231100000053 low toxicity Toxicity 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- QPJVMBTYPHYUOC-UHFFFAOYSA-N methyl benzoate Chemical compound COC(=O)C1=CC=CC=C1 QPJVMBTYPHYUOC-UHFFFAOYSA-N 0.000 description 2
- 229960004036 nonivamide Drugs 0.000 description 2
- 231100001160 nonlethal Toxicity 0.000 description 2
- PGMYKACGEOXYJE-UHFFFAOYSA-N pentyl acetate Chemical compound CCCCCOC(C)=O PGMYKACGEOXYJE-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 230000001698 pyrogenic effect Effects 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 239000004509 smoke generator Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- WINCSBAYCULVDU-UHFFFAOYSA-N 1,1,2-trimethylcyclopentane Chemical compound CC1CCCC1(C)C WINCSBAYCULVDU-UHFFFAOYSA-N 0.000 description 1
- 235000002567 Capsicum annuum Nutrition 0.000 description 1
- 240000004160 Capsicum annuum Species 0.000 description 1
- 235000008534 Capsicum annuum var annuum Nutrition 0.000 description 1
- 235000002568 Capsicum frutescens Nutrition 0.000 description 1
- 206010011224 Cough Diseases 0.000 description 1
- 229920004943 Delrin® Polymers 0.000 description 1
- 208000000059 Dyspnea Diseases 0.000 description 1
- 206010013975 Dyspnoeas Diseases 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 206010015150 Erythema Diseases 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 206010015958 Eye pain Diseases 0.000 description 1
- 206010019233 Headaches Diseases 0.000 description 1
- 206010023644 Lacrimation increased Diseases 0.000 description 1
- 201000008197 Laryngitis Diseases 0.000 description 1
- 206010028813 Nausea Diseases 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- CIBSHGQCRWLUSX-UHFFFAOYSA-N OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.CCC(CO)(CO)CO.CCC(CO)(CO)CO Chemical compound OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.CCC(CO)(CO)CO.CCC(CO)(CO)CO CIBSHGQCRWLUSX-UHFFFAOYSA-N 0.000 description 1
- 206010068319 Oropharyngeal pain Diseases 0.000 description 1
- 239000006002 Pepper Substances 0.000 description 1
- 235000016761 Piper aduncum Nutrition 0.000 description 1
- 235000017804 Piper guineense Nutrition 0.000 description 1
- 244000203593 Piper nigrum Species 0.000 description 1
- 235000008184 Piper nigrum Nutrition 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 206010038731 Respiratory tract irritation Diseases 0.000 description 1
- 208000036071 Rhinorrhea Diseases 0.000 description 1
- 206010039101 Rhinorrhoea Diseases 0.000 description 1
- 241001247145 Sebastes goodei Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 206010047700 Vomiting Diseases 0.000 description 1
- 206010047924 Wheezing Diseases 0.000 description 1
- HVVWZTWDBSEWIH-UHFFFAOYSA-N [2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HVVWZTWDBSEWIH-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001408 amides Chemical group 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229960002903 benzyl benzoate Drugs 0.000 description 1
- 206010005159 blepharospasm Diseases 0.000 description 1
- 230000000744 blepharospasm Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 239000001511 capsicum annuum Substances 0.000 description 1
- 239000001722 capsicum frutescens oleoresin Substances 0.000 description 1
- 229940050948 capsicum oleoresin Drugs 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 230000007665 chronic toxicity Effects 0.000 description 1
- 231100000160 chronic toxicity Toxicity 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013068 control sample Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Natural products CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 235000013373 food additive Nutrition 0.000 description 1
- 239000002778 food additive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 231100001032 irritation of the eye Toxicity 0.000 description 1
- 230000004317 lacrimation Effects 0.000 description 1
- 231100001231 less toxic Toxicity 0.000 description 1
- 231100000647 material safety data sheet Toxicity 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229940095102 methyl benzoate Drugs 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 231100000017 mucous membrane irritation Toxicity 0.000 description 1
- 230000008693 nausea Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 210000004789 organ system Anatomy 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 210000004994 reproductive system Anatomy 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 230000035909 sensory irritation Effects 0.000 description 1
- 238000013207 serial dilution Methods 0.000 description 1
- 208000013220 shortness of breath Diseases 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 206010042772 syncope Diseases 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
- 239000003832 thermite Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 208000023409 throat pain Diseases 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 231100000925 very toxic Toxicity 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
- 230000008673 vomiting Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
- C06D7/00—Compositions for gas-attacks
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
- C06D3/00—Generation of smoke or mist (chemical part)
Definitions
- Smoke generation devices generate smoke in military applications for signaling, for marking target or landing zones, and for screening of movements.
- Devices for producing obscurant smoke for the battlefield are typically either explosively-charged, meaning the devices use an explosive charge to disperse fine particles, or chemically-reactive, meaning a chemical reaction generates smoke.
- Some chemically-reactive smoke generation devices utilize inorganic materials that are activated in a self-sustaining chemical reaction to produces smoke as a byproduct of the heat generation. Examples of these smoke generation devices are thermite grenades and the HC (hexachloroethane), TA (terephthalic acid), and WP (white phosphorus, or red phosphorus) smoke grenades in the current military inventory.
- Heat generation is an issue with either explosively-charged or chemically-reactive smoke generation devices.
- Traditional smoke generation devices are incendiary and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death. What is desired is a smoke producing mixture that is capable of producing smoke while minimizing the incendiary and chemical hazards of present devices.
- Capsaicinoids are a class of compounds first discovered in the fruits of genus Capsicum (chili peppers). Capsaicinoids have the unusual property of causing sensory irritation in mammals, including humans, and produce a sensation of burning in any tissue with they contact. The burning sensation can be very severe, causing excruciating pain, fainting, and even temporary blindness. However, capsaicinoids have very low toxicity, and while contact with the compounds can be agonizingly painful, exposure has few or no lasting effects. These properties would seem to make capsaicinoids ideal nonlethal weapons. However, delivery of capsaicinoids is difficult. Capsaicinoids are non-volatile and extremely insoluble in water.
- capsaicinoids have been limited to delivery by sprays, which have many disadvantages. Sprays are inaccurate, and even if the target is hit, the target will not feel the full effects of the capsaicinoids unless the spray contacts the target's mouth, nose, or eyes. Sprays have limited range, giving the user little time to aim and allowing the target to achieve close proximity to the user before the user has a chance to use the spray. This disadvantage is especially acute when the user is targeting an attacking animal, many of which can cover the distance between the maximum range of the spray and the user within one or two seconds.
- US 2014/020588 discloses a composition for the low-temperature generation of smoke comprising a monomer compound that exothermically polymerizes upon initiation and an initiator compound.
- US 1,886,394 , FR 3018277 and ES 2302620 disclose smoke generating pyrotechnic compositions comprising a capsaicin or capsaicinoid compound.
- a smoke producing method and device of the present disclosure produces a non-incendiary, organic-polymerization based, smoke-producing reaction.
- Some embodiments of the smoke contain one or more capsaicinoid compounds.
- the method of generating smoke comprises initiating a frontal polymerization reaction by heating a composition comprising a monomer compound that exothermically polymerizes upon initiation with an initiator compound, and an initiator compound that initiates polymerization of the monomer compound present at a mass concentration that is at least five percent (5%) of the mass concentration of the monomer compound.
- the smoke produced mainly comprises thermal decomposition products of the initiator compound.
- the initiator may also decompose exothermically.
- the by-product that results from smoke generation in this embodiment is a solid material that will slowly degrade over time if exposed to outside conditions.
- the initiator concentration controls the chain length of the produced polymer. Also, in a typical polymer reaction, the initiator is consumed, chemically bonded to the polymeric molecules. In this type of smoke producing reaction the objective, at a minimum, is to decompose and volatilize initiator as well as additives and /or portions of the monomer itself.
- Frontal polymerization is a process in which the reaction propagates directionally through the reaction vessel because of the coupling of thermal transport and the Arrhenius-dependence of the kinetics of an exothermic reaction.
- Frontal polymerization is very much like a flame but propagating through condensed materials instead of a gas.
- the components are premixed, but stable until initiated by an external source. For example, consider a 2-part epoxy: as soon as the two components are mixed, an exothermic reaction is initiated).
- RTV type polymers will self-initiate once exposed to oxygen.
- the reactions developed here operate differently than either of these or similar types of examples.
- Frontal Polymerization is a form of self-propagating high-temperature synthesis (SPHTS).
- high-temperature is used to indicate higher than ambient temperature, but certainly lower in temperature than pyrotechnic igniters used in current smoke grenades.
- FP as in the case of SPHTS the system will not start reacting until sufficient energy is applied to the material to get a reaction front propagating through the system.
- This self-propagating wave moves rapidly through the system as long as sufficient heat is generated at the propagation front.
- these systems are inherently stable until a sufficient amount of energy is added to start the reaction. Materials with high heat capacity can be incorporated into the mixture.
- the system can be turned such that the heat released does not lead to excessive heating of the surrounding environment, thereby reducing incendiary hazards.
- the addition of filler materials has the effect of reducing the front temperature and thereby reducing the incendiary hazard since the "excess" heat generated can be "absorbed” in the material itself and not transmitted to the environment.
- the reactants used in the smoke producing compounds disclosed herein have reaction temperatures in the range of 300-400°C. (However, as indicated above, the reaction temperature may be tuned to above ambient to 400° C).
- reaction temperatures in the range of 300-400°C.
- the reaction temperature may be tuned to above ambient to 400° C.
- the initiator concentrations are on the order of 1% or less by mass. This concentration is expressed in polymer literature as 1 pph (parts per hundred of the monomer). As an example, a 10 gram sample with 20 pph initiator and 10 pph fumed silica contains 10 grams of monomer, 2.0 grams of initiator, and 1.0 grams of fumed silica. In experimental testing of the smoke producing compound of the present disclosure, it was found that increasing the amount of initiator in the compound increased the amount of smoke produced.
- Smoke production is caused by a decomposition of the monomer-initiator pair in the smoke generation compound.
- the fact that smoke production comes from the monomer-initiator pairs has advantages.
- lower reaction temperatures can be used because higher temperatures are not required to volatize a third component in the mixture.
- the initiator is the source of the smoke in this embodiment, it is only necessary to have a sufficient reaction temperature to sustain the initiator decomposition reaction.
- a higher efficiency of smoke production can be achieved. Since the smoke is due to the initiator and no longer to a third component the "extra" mass was no longer necessary. The monomer itself may decompose, leading to additional smoke production.
- a composition for the non-pyrotechnic generation of capsaicinoid-containing smoke comprising: a monomer compound that exothermically polymerizes upon initiation with an initiator compound; an initiator compound that initiates polymerization of the monomer compound, said initiator present at a mass concentration that is at least double the mass concentration of the monomer compound; and a capsaicinoid compound in an amount effective to produce an organoleptic effect in the smoke.
- a method of generating capsaicinoid-containing smoke comprising initiating a frontal polymerization reaction by heating the composition above to a sufficient temperature, and generating smoke comprising the capsaicinoid and thermal decomposition products of the initiator compound.
- a non-pyrotechnic capsaicinoid smoke generator comprising: a support member having a length and a width; the composition above supported by the support member; an ignition wire in contact with the composition; and a source of electric current connected to the ignition wire.
- the disclosure provides compositions for producing smoke.
- the smoke may contain one or more capsaicinoid compounds.
- Various embodiments of the compositions disclosed herein have advantages over previously known smoke-producing compositions; for example: low or no flame front (safe to use indoors, outdoors, and in training environments with flame hazards); low toxicity of the smoke and any non-smoke residues; environmentally friendly (little to no residue or hazardous byproducts); high packing density; high smoke yield/low agglomeration of smoke particles; easily aerosolized, rapid smoke generation (short time constant); good obscuration properties in the visible portion of the electromagnetic spectrum; long smoke durations with appropriate buoyancy; and good shelf life (i.e., after mixing components, the mixture does not self-initiate polymerization).
- the monomer provides the carbon compounds that will form the polymer chains and the initiator provides a mechanism to join the carbon compounds together.
- the baseline monomer used in the composition of the present disclosure is TMPTA (trimethylolpropane triacrylate).
- TMPTA trimethylolpropane triacrylate
- Other monomers are possible and it is possible to combine other materials with the monomer for various effects. For example, by combining TMPTA with dibutyl phthalate, a large amount of smoke can be generated, but the smoke is not as buoyant as with TMPTA only. It may be possible to develop a smoke with tailorable buoyancy - which is useful if it is desired to reduce the duration of the smoke.
- the smoke producing compound of the present disclosure can result in smoke durations in excess of 20 min.
- the monomer may also be a material with a backbone other than carbon; for example, the Silicon backbone in Silicone caulk or RTV sealant.
- the production of a polymer is not a necessity.
- the primary role of the monomer is that it provides the heat source so that the reaction proceeds in a timely manner.
- Frontal Polymerization as opposed to other polymerization mechanisms, the mixed monomer and initiator are stable until an external excitation source is added.
- the baseline initiator for the smoke producing compound of the present disclosure is Luperox®-231 (1,1-Bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane).
- Other initiators are possible but may have, or are shown to have, undesirable effects.
- t-butyl peroxybenzoate may be used with good smoke generation results.
- the benzoic acid byproducts are considerably more hazardous than the trimethyl cyclohexanes (TMCH) generated with the baseline initiator.
- TMCH trimethyl cyclohexanes
- the trimethyl cyclohexane smoke product or byproduct is not an acid or acid forming material. According to the toxicity analysis the inhalation and LD50 thresholds of TMCH are much higher than for the currently used materials (HC and RP).
- the ignition (or initiation) mechanism used in the testing disclosed herein was a heat source.
- the heat source does not have to, but can, be pyrogenic.
- This ignition mechanism list is not exhaustive.
- Other ignition mechanisms considered are: piezo devices that might be used to ignite something more pyrogenic such as cannon fuse, battery powered voltage sources for nichrome wire, etc. A mixture including monomer and initiator will not self-initiate without an ignition source - this contributes to the long shelf life and inertness of the material.
- the filler provides a mechanism, or a matrix, for the smoke mixture to have a shape other than that provided by its container (e.g., a liquid or gas assumes the shape of its container, but a solid or a gel may not).
- Fumed silica, kaolin (clay) powder, and powdered sugar have all been used as fillers. Fumed silica has provided the best performance - the mass required is low, it has a high area-mass ratio which provides significant thickening with a low thermal mass. This prevents it from robbing the reaction of the heat required for the reaction to propagate. Increasing the amounts of kaolin powder and powdered sugar have been shown to rob the reaction of its necessary heat and reduce the amount of smoke.
- the smoke mixture is left as a liquid - so the filler / thickening agent might not be required or might be detrimental to the application.
- the primary mixture components of the smoke producing composition also have enough thermal conductivity that, if a point ignition source is applied, the bulk mixture reactants may quickly convect the required reaction energy away from the reaction site and cause the reaction to quench itself.
- the very low thermal conductivity of fumed silica "insulates" the reaction region, preventing the heat of reaction or of initiation from convecting away too rapidly.
- a large area heat source such as a heat gun, may be required to inject significant heat into the mixture to overwhelm the convective heat losses.
- Present experimentation has shown cases where, for all other mixture components held constant, increases in filler (fumed silica) have resulted in a higher absorption smoke.
- the filler may provide more nucleation sites for polymerization to initiate.
- the smoke producing compound if X g of TMPTA monomer is used, then greater than 0.1 X g of Luperox® 231 initiator, and greater than or equal to 0.1 X g of fumed silica filler are to be used. This mixture would be considered a "greater than 10 pph" mixture (greater than 10 parts initiator to .100 parts monomer). Note that the initiator concentration may be allowed to approach infinity (i.e., no monomer) and still generate smoke. The initiator may also decompose exothermically.
- ratios for standard reactions wherein the polymerization product, not the smoke product, is desired are characterized by initiator concentrations utilizing much less than 10 pph - typically 0.01 pph - 0,1 pph, but less than 1 pph.
- the TMPTA (trimethylolpropane triacrylate) is a trifunctional monomer. This means that there are three double-bond carbon ends associated with each monomer molecule.
- Typical monomer-polymer system include compounds that have a single carbon double-bond along the monomer chain; ethylene, styrene, vinyl chloride.
- a single initiator molecule causes the breaking of the double bond and a monomer free radial to be formed. This monomer free radical then reacts with other monomers and a polymer molecule begins to grow. Termination of the process occurs when two free radicals combine; either a second polymer free radical or the other half of the initiator molecule. Polymer molecules of 1000 to 100,000 monomers are commonly produced.
- One of the controlling parameters of the final chain length is the number of initiator molecules added.
- typical initiator concentrations are a few hundredths to millionths of percent; high initiator concentrations yield low molecular weight polymer molecules.
- the heat generated from the polymerization process is due to the breaking of the carbon double bond and the formation of a carbon single bond. This process releases 60kJ of energy per mole of double bonds.
- the process temperature of the reaction depends on the heat capacity of the monomer molecules. Molecules such as poly(ethylene) C2H4 have a much lower heat capacity than molecules such as styrene C8H10 and have much higher reaction temperature since they both have a single double-bonded carbon that participates in the reaction.
- Capsaicinoids are a class of compounds originally discovered in Capsicum spp., although synthetic derivatives have also been produced. Capsaicinoids are generally related to capsaicin, which has the following structure:
- Capsaicinoids tend to share the 4-hydroxy-3-methoxyphenyl methyl group but vary in the structure of the hydrocarbon tail bound to the amide moiety. For example, some capsaicinoids lack double bonds in the hydrocarbon tail, others lack the pendant methyl group, other vary the location of the unsaturated carbons, in still others the length of the hydrocarbon tail varies from about 7 to about 9 carbons (not counting pendant groups).
- a capsaicinoid is any ester of vanillamine having a hydrocarbon tail at least 5 carbons in length.
- the capsaicinoid is one that is exerts an organoleptic effect on the intended target (which will be a mammal).
- organoleptic means producing a sensible effect, such as a burning sensation.
- the effect may be an irritant effect, meaning an effect that is at least painful.
- the irritant effect may also be one or more of ocular redness, ocular pain, lacrimation, blepharospasm, blindness, respiratory tract irritation, mucous membrane irritation, coughing, wheezing, intranasal pain, throat pain, laryngitis, headache, nausea, vomiting, runny nose, and shortness of breath.
- capsaicinoids known to exert organoleptic or irritating effects include capsaicin, dihydrocapsaicin, nordihydrocapsaicin, homocapsaicin, homodihydrocapsaicin, and nonivamide. Salts, esters, and other derivatives of the capsaicinoid may be used, so long as the derivative has the desired organoleptic or irritant properties.
- the organoleptic properties of capsaicinoids (and other substances) are generally measured in the art by the method of Scoville (1912) J. Am. Pharm. Assoc, vol. 1, pp.
- the method involves extracting one grain (64.8 mg) of the sample in 100 mL of ethanol; then serially diluting the extract in water.
- the serial dilutions are tasted by a panel of tasters, until the highest dilution in which the substance can be tasted is identified.
- the ratio of water to the ethanol extract in said highest tasteable dilution is the potency of the sample in "Scoville Heat Units" (SHU).
- SHU Stcoville Heat Units
- capsaicinoids have been assigned standard SHU values, as follows (a commonly eaten variety of Capsicum annuum has been included for reference): TABLE 1: EXEMPLAR CAPSAICINOIDS AND THEIR SHU VALUES Compound SHU Capsaicin 1.6 x 10 7 Dihydrocapsaicin 1.5 x 10 7 Nonivamide 9.1 x 10 6 Nordihydrocapsaicin 9.1 x 10 6 Homodihydrocapsaicin 8.6 x 106 Homocapsaicin 8.6 x 10 6 Jalape ⁇ o pepper 5-20 x 10 3 Any of the above capsaicinoids may be used.
- the concentration of capsaicinoid will be sufficient to confer an organoleptic property to the smoke, such as an irritant property.
- some embodiments of the composition contain at least 1% w/w of the capsaicinoid.
- Further embodiments of the composition contain the capsaicinoid at 1-20% w/w, 2-15% w/w, or 5-10% w/w.
- Specific embodiments of the composition contain 5 or 10% capsaicinoid by weight.
- the concentration of the capsaicinoid in the composition may also be designed to achieve a target SHU or SHU range.
- some embodiments of the composition are at least 10 5 , 1.6x10 5 , or 10 6 SHU.
- Further embodiments of the composition contain the capsaicinoid at 1.6x10 5 to 3.2x10 6 , 3.2x10 5 to 2.4x10 6 , or 8x10 6 to 1.6x10 7 SHU.
- Specific embodiments of the composition are 8x10 6 or 1.6x10 7 SHU.
- Fig. 1 is a functional schematic of an exemplary test performed to measure the characteristics of a smoke producing sample 101 in a chamber 100.
- the chamber 100 was substantially one (1) cubic foot in volume (11" x 12" by 10"). Specifically, a Fisher Scientific® Dry Box was used as an air tight chamber 100 in this test.
- An FP reaction of the sample 101 was remotely initiated via a wire 108 extending through the chamber wall and to a power source (not shown).
- a fan 106 inside the chamber 100 circulated the smoke (not shown) produced by the reaction.
- Visible spectra measurements were taken with an Ocean Optics HR2000 UV-Vis spectrometer 102.
- the optical cell (not shown) was a Starna 34-SOG-100 10cm cell. Infrared spectra were determined with a Nexus470 FTIR 103 using a 4" pathlength cell (not shown) with KBr windows (not shown).
- the chamber 101 comprised a transparent window 107 to allow visual access to the sample under test for viewing the smoke and measuring smoke parameters.
- a vent hood 104 collected fumes from the test and a vent 105 vented fumes outside of the building.
- Tests were run to quantify the amount of material necessary to produced a dense enough smoke for obscuration.
- a series of tests using different sample weights with 25 pph starting material versus optical density were run in the 50ft 3 chamber.
- the amount of material was increased from 5 to 25 grams of monomer (all with 25 pph of initiator); this corresponds to 0.1 to 0.5 grams of monomer per ft3 of chamber volume.
- Figs. 2a - 2f show a series of photographic measurements showing the smoke density increase as increasing amounts of sample smoke producing material are activated.
- a laser power meter 201 measured optical transmission of smoke in the chamber 200.
- Tape 203 defined a rectangular transparent window 204.
- Two tape strips 202 were mounted horizontally on the opposite inside side wall of the chamber.
- the tape strips 202 are clearly visible through the window 204.
- the smoke density is 0.10 grams monomer per cubic foot
- the tape strips 202 become less visible.
- the beam 207 from the laser power meter 201 is clearly visible in Fig. 2b .
- Fig. 2c which illustrates a smoke density of 0.15 grams monomer per cubic foot
- the tape strips 202 are invisible.
- the smoke density is 0.20 grams monomer per cubic foot.
- the smoke density is 0.25 grams monomer per cubic foot.
- the smoke density is 0.30 grams monomer per cubic foot.
- Fig. 3 is a plot of the optical density versus time for the same mass of materials from testing performed in 50ft3 chamber. This figure shows that after about 0.15 grams of starting monomer per cubic foot (gm/ft 3 ), the optical density drops below 0.1. Comparing the results of Figs. 2c with Fig. 3 at 0.15 gm/ft 3 the smoke density is almost sufficient to totally obscure the reference tapes 202 ( Fig. 2c ) on the opposite wall. As the sample mass increases up to 0.3 gcf the smoke density and its obscurant ability clearly increase.
- the photographic series Figs. 2a - 2f illustrates a quirk of the laser beam visibility: with increasing smoke density, the laser beam 207 actually seems brighter and more visible. This result is also shown in the data of Fig. 3 .
- the measured optical density for starting sample mass of greater than 0.15 gcf is actually greater than for 0.15 gcf itself, while it is clear from the photographs in Fig. 2c - 2f that the smoke is denser. This higher measured optical density is likely due to a multiple scattering phenomena competing with the initial beam absorption/scattering.
- the duration of the smoke is considerable.
- the starting monomer and initiator in the exemplary testing was TMPTA and Luperox® 231.
- the expected decomposition products have been analyzed both through a literature review and via Gas Chromotograph-Mass Spectrometer (GC-MS) analysis of the smoke products.
- GC-MS Gas Chromotograph-Mass Spectrometer
- Fig. 4a is a schematic of the decomposition pathway of the Luperox® 231 and Fig. 4b is a schematic of the decomposition pathway of the mono- and di-function monomer impurities in the commercial grade TMPTA. In this schematic, dotted lines are cleavage.
- reaction products are trimethylcyclohexane and t-butyl alcohol.
- the reaction products of the monomer decomposition are not seen in the smoke but may affect its infrared absorption properties.
- the mass loss was approximately proportional to the amount of initiator added. At higher initiator concentrations (greater than 10 pph) the total mass loss was greater than the initiator mass.
- the additional mass loss -- resulting in more smoke -- is considered to be due to a decomposition of mono-functional, and di-functional "impurities" that are present in the commercial grade TMPTA.
- the additional mass loss could be due to a decomposition of the tri-functional TMPTA itself, but this is considered to be unlikely.
- Fig. 5 illustrates the results of an additional series of tests run with concentrations approaching 50 pph. Note that it is unclear whether that the mass loss rate is decreasing at the 50 pph (50%) point. This indicates that it is desirable to perform additional tests with initiator concentrations greater than 50 pph.
- the internal temperature of 5 gram samples of the mixed compound was measured in order to better understand the safety, and non-incendiary, characteristics of the frontal polymerization reaction.
- the internal sample temperature was 100-200°C.
- the internal temperature increased to 300-350°C. This temperature is likely sufficient to lead to some decomposition of the monomer itself, which may be helped by the appreciable excess of initiator.
- a series of tests was performed to determine the effect of aspect ratio (width v. length at fixed heights) of the sample versus the amount of smoke produced. These tests were conducted under three testing/operating scenarios, 1) front and rear initiation of the reaction, 2) cylindrical samples of varying aspect ratio, initiated from the top "free” surface, and 3) rectangular samples of varying aspect ratios. Test geometries 1) and 2) were conducted in the one ft 3 test chamber and the third series of tests were conducted in the 50 ft3 chamber.
- the sample smoke producing compound was 10 pph Luperox® 231 and 10 pph fumed silica filler.
- Figs. 6a - 6c illustrate the tests performed to analyze initiation of a smoke producing reaction to measure the amount of smoke produced when the reaction was initiated from the front, expanding portion, of the sample contained in a glass vial.
- the sample 600 is disposed near an open front end 601 of a glass vial 602.
- the sample 600 has just been ignited.
- Fig. 6c is a wider view of the sample 600 after the smoke has expanded. The smoke was close to neutrally buoyant and filled the test chamber in an amount that would be expected, given the size of the sample.
- Figs. 7a - 7c illustrate the tests performed to analyze initiation of a smoke producing reaction to measure the amount of smoke produced when the reaction is initiated from a sample disposed in the rear, constrained, portion of a glass vial.
- the sample 700 is disposed near the rear end 701 of a glass vial 702.
- any hot smoke vapors have to travel through the unreacted portion of the sample before reaching the open end 703 of the vial 702.
- the resultant smoke was denser than the surrounding air and tended to sink to the bottom of the test chamber.
- the frontal polymerization reaction proceeded to completion.
- the second series of trials tested a constant volume of material in three cylinder shapes with bores of different aspect ratios, 2:1, 1:1, 1:3, and 1:5, as illustrated in Fig. 8 .
- the cylinder bores were generated by drilling holes in a Delrin puck. A syringe was used to place the samples in the bore holes.
- These tests showed that the 2:1 aspect ratio sample had the most smoke production; the 1:3 and 1:5 aspect ratio tests produced a minor amount of smoke.
- the 2:1 aspect ratio test produced a typical amount of smoke.
- Table 4 The test results are reported in Table 4 below. In each of these tests, the reaction was initiated at the top of the sample with enclosed sides and bottom. The conclusion from these tests is that a low aspect ratio of height to diameter is desirable. Table 4.
- Fig. 9 is a photograph of a test setup from the final series of tests, which were conducted with 10 gram samples (20 pph initiator, 10 pph silica), spread out on a section of lumber 900.
- Selected thickness lumber guide rails 901 were spaced about one inch apart, the guide rails were varied from 3/16 inches in height, to 1 ⁇ 4" in height to 1 ⁇ 2" in height, and the sample 902 (shown after the reaction) was spread out to roughly 1.5 to 4 inches long between the guide rails.
- Note that the in Fig. 9 lumber shows no signs of combustion and in spite of the fact that it has been used for several dozen tests.
- the measured optical density values are given in Table 5 below. These results confirm that the layer thickness play a critical role in the efficiency of smoke produced. Table 5.
- Initiators Monomers Luperox® 231 t-butyl peroxybenzoate TMPTA (Trimethylolpropane triacrylate) Good smoke-Control sample Similar to Control TMPTA+dibutyl phthalate Good or better smoke-smoke sinks No Test PETA (Petaerythritol triacrylate) Poor smoke Poor smoke DTMPTA (Di(trimethylolpropane) triacrylate) Poor or no smoke No smoke
- Fig. 10 illustrates the visible absorption spectrum of the smoke produced from the TMPTA-Luperox 231 reaction from the start of the reaction to about 20 minutes after is shown.
- the data was taken using the one ft3 chamber that was connected to the Ocean Optics spectrometer through flow-ports installed in the back of the chamber.
- This figure shows that the smoke produced has a uniform absorption across the (entire) visible spectrum from 300-1000 nm. Thus, it evenly scatters all the visible wavelengths. It can also be seen in the figure that the smoke has a persistence of at least 5 minutes. From this data and from other tests this indicates that the particle sizes are in a range where there is not rapid sedimentation of the particles or droplets.
- Fig. 11 illustrates the infrared absorption spectrum of the smoke produced from the TMPTA-Luperox 231 reaction from the start of the reaction to about 9 minutes after the reaction.
- the data was taken using the 1 ft3 chamber that was connected to the Nexus 470 FTIR system through flow-ports installed in the back of the chamber.
- the infrared cell has KBr windows.
- the infrared spectrum has unique peaks associated with the trimethylcyclohexane, t-butyl alcohol, and acetone produced in the reaction.
- the infrared peak from a human body is centered around 10 m; indicating that the current version of this smoke is not an infrared obscurant for humans.
- the absorption peaks at approximately 6, 7 and 8 m indicate that the smoke has obscurant properties for 225, 150, and 100°C bodies. No efforts were made during the Phase I research to modify the reaction products to make the smoke obscure humans.
- the toxicity of the decomposition products has been analyzed from the MSDS data that is available for the initiator decomposition products: trimethylcyclohexane, tert-butyl alcohol, and acetone. Values for the known decomposition products of our formulation and current inventory grenades are given in Table 7 below. While excessive exposure to acetone and ter-tbutyl alcohol should be avoided, these compounds are the primary component of many household products such as nail polish remover. Table 7 below shows that the decomposition products of the smoke producing formulation disclosed herein are substantially less toxic or reactive than presently used compounds. (Hexachloroethane and phosphoric acid are included as reference materials.) Table 7. Toxicity and workplace exposure data for Luperox® 231 decomposition products.
- the composition is not incendiary, and adding (inorganic) oxidizers to the mix may cause it to start a fire, which would be undesirable. Therefore, the composition avoids inorganic oxidizers.
- the smoke in the composition is produced from the decomposition of the initiator in the composition, which can be thought of as an/the oxidizer.
- the composition differs from currently known formulations in that it is this "oxidizer" that makes the smoke. Adding an inorganic oxidizer would likely cause the smoke production to decrease.
- the desired smoke production requires approximately 0.020 grams of material per cubic foot of obscured volume when viewed through a 10 m thick smoke screen. For a 5 m thick smoke screen 0.04 grams / cu. ft. of material are required, The obscurant factor is constant across the visible spectrum, and has infrared absorption in specific wavelength ranges. Assuming ideal and complete reaction efficiency, for a 300 m 3 (3m ⁇ 10m ⁇ 10m or 10,600 ft3) obscured volume, approximately 200 cm 3 of material is projected to be required, representing a device approximately 4 inch in height and 2 inches diameter; without casing, fuse or ignition source. Analysis of the mechanism of smoke production indicates a strong potential that a smoke could be produced with 0.010-0.015 grams of material per cubic foot of required coverage. The casing and fusing requirements will result in a final device size of generally 5 inches in height and about 3 inches diameter; which represents devices currently in the inventory.
- Fig, 12 depicts an embodiment (not part of the invention) of a smoke generating device 1100 using the compound disclosed herein.
- the smoke generating compound (not shown) is applied to disks 1101, 1102, 1103, 1104 and 1105 stacked atop one another.
- disks 1101 - 1105 are shown in Fig. 11 , this number of disks is illustrated for explanatory purposes; a smoke generating device 1100 may comprise 10-30 stacked disks, or more or fewer, as desired.
- each disk 1101 -1105 is formed from non-woven fiber, such as a plastic fiber similar to Scotch Brite® pads or a plastic Brillo® pad, or fiberglass.
- the disks 1101 -1105 may also be formed from other materials with a high surface area for maximizing the composition's exposure to oxygen during the smoke-producing reaction.
- An ignition wire 1106 extends through openings 1107 in the disks 1101 - 1105 for initiating the reaction.
- the ignition wire 1106 may be "woven" into the fiber comprising the disk.
- Wires 1108, 1109, 1110, and 1111 extend between adjacent disks.
- wire 1108 extends between disk 1101 and disk 1102;
- wire 1109 extends between disk 1102 and disk 1103;
- wire 1110 extends between disk 1103 and disk 1104;
- wire 1111 extends between disk 1104 and disk 1105,
- insulators are disposed between adjacent disks to isolate each disk from the remaining disks, to prevent the disks from sticking together.
- Fig. 13 depicts an embodiment (not part of the invention) of a smoke producing device comprising a substrate 1300 formed from a single sheet of material, rolled into a spiral shape as shown.
- the substrate 1300 may be formed from the materials discussed above with respect to Fig. 12 .
- An ignition line 1301 extends through the substrate 1300.
- Fig. 14 depicts a "stacked spiral" arrangement in which a plurality of spiral substrates 1400 like those discussed above with respect to Fig. 13 are stacked atop one another. Each substrate comprises an ignition line 1401.
- Figs. 15a, 15b and 15c depict an embodiment (not part of the invention) of a smoke producing device in which a plurality of cylindrical petals 150, 151 and 152 nested inside a cylindrical container 153 that is hinged on one side via a hinge 154.
- Figs. 15a and 15b depict the container 153 before the smoke producing ignition is initiated
- Fig. 15c depicts the container 153 after the ignition has begun.
- three petals 150, 151, and 152 are depicted in the illustrated embodiment, more or fewer petals are employed in other embodiments.
- the ignition sequence causes the container 153 to be split so that it opens up along a hinge line 155 of the container 153.
- the concentrically arranged petals 150, 151 and 152 are ignited and split along one side so that they "open up” like a blooming flower.
- Each of the petals 150, 151 and 152 may be formed from the materials discussed with respect to Fig. 12 above.
- a first test was performed by adding commercially available oleoresin capsicum (ethanol extract from Capsicum fruit) to a non-pyrotechnic smoke composition comprising 10% w/w monomer, 10% w/w fumed silica filler, and 80% w/w initiator.
- the oleoresin capsicum was added to the non-pyrotechnic smoke composition at a ratio of 1 part oleoresin capsicum to 10 parts smoke composition by weight.
- a frontal polymerization reaction was initiated in 10 g of the mixture placed in an enclosed shipping container 8 feet (2.44 m) by 10 feet (3.05 m) by 40 feet (12.19 m) (90.7 m 3 ). Smoke production was observed to be very slow.
- a second test was performed using crystalized capsaicin in place of capsicum oleoresin.
- Capsaicin was added to the same smoke composition at a ratio of 1 part capsaicin to 10 parts smoke composition by weight.
- a frontal polymerization reaction was initiated in 10 g of the mixture placed in an enclosed warehouse 25 feet (7.62 m) by 25 feet (7.62 m) by 25 feet (7.62 m) (442.5 m 3 ). The rate of smoke production did not appear to be affected by the addition of the capsaicin.
- two human test subjects approached the warehouse after the completion of smoke production, they were immediately repelled upon contact with the smoke. The subjects coughed severely and reported burning irritation of the eyes and nasal passages.
- the test was repeated using a mixture at a ratio of 1 part capsaicin to 20 parts smoke composition by weight with similar results.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Botany (AREA)
- Pest Control & Pesticides (AREA)
- Plant Pathology (AREA)
- Polymerisation Methods In General (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
- Smoke generation devices generate smoke in military applications for signaling, for marking target or landing zones, and for screening of movements. Devices for producing obscurant smoke for the battlefield are typically either explosively-charged, meaning the devices use an explosive charge to disperse fine particles, or chemically-reactive, meaning a chemical reaction generates smoke. Some chemically-reactive smoke generation devices utilize inorganic materials that are activated in a self-sustaining chemical reaction to produces smoke as a byproduct of the heat generation. Examples of these smoke generation devices are thermite grenades and the HC (hexachloroethane), TA (terephthalic acid), and WP (white phosphorus, or red phosphorus) smoke grenades in the current military inventory. The reactions in these devices have large free energies of reaction, and are by necessity exothermic. As such, the reactions produce considerable heat and toxic, or hazardous, compounds. Typical smoke-producing reactions produce much more heat than is necessary to sustain the reaction. The adiabatic flame temperatures of these materials greatly exceed 1000°C, which is one of the factors that leads to their incendiary characteristics.
- Heat generation is an issue with either explosively-charged or chemically-reactive smoke generation devices. Traditional smoke generation devices are incendiary and can set cloth, fuel, ammunition and other combustibles on fire, and cause serious burns or death. What is desired is a smoke producing mixture that is capable of producing smoke while minimizing the incendiary and chemical hazards of present devices.
- Capsaicinoids are a class of compounds first discovered in the fruits of genus Capsicum (chili peppers). Capsaicinoids have the unusual property of causing sensory irritation in mammals, including humans, and produce a sensation of burning in any tissue with they contact. The burning sensation can be very severe, causing excruciating pain, fainting, and even temporary blindness. However, capsaicinoids have very low toxicity, and while contact with the compounds can be agonizingly painful, exposure has few or no lasting effects. These properties would seem to make capsaicinoids ideal nonlethal weapons. However, delivery of capsaicinoids is difficult. Capsaicinoids are non-volatile and extremely insoluble in water. There have been no successful efforts to deliver capsaicinoids as a gas or smoke, due to their low volatility and insolubility. As a result, the use of capsaicinoids as nonlethal weapons has been limited to delivery by sprays, which have many disadvantages. Sprays are inaccurate, and even if the target is hit, the target will not feel the full effects of the capsaicinoids unless the spray contacts the target's mouth, nose, or eyes. Sprays have limited range, giving the user little time to aim and allowing the target to achieve close proximity to the user before the user has a chance to use the spray. This disadvantage is especially acute when the user is targeting an attacking animal, many of which can cover the distance between the maximum range of the spray and the user within one or two seconds.
- Consequently there is a need in the art for a means to deliver capsaicinoids in the form of a smoke, ideally a non-toxic and non-pyrotechnic smoke that will neither poison nor burn those exposed to it.
-
US 2014/020588 discloses a composition for the low-temperature generation of smoke comprising a monomer compound that exothermically polymerizes upon initiation and an initiator compound.US 1,886,394 ,FR 3018277 ES 2302620 - A smoke producing method and device of the present disclosure produces a non-incendiary, organic-polymerization based, smoke-producing reaction. Some embodiments of the smoke contain one or more capsaicinoid compounds. In one embodiment, the method of generating smoke comprises initiating a frontal polymerization reaction by heating a composition comprising a monomer compound that exothermically polymerizes upon initiation with an initiator compound, and an initiator compound that initiates polymerization of the monomer compound present at a mass concentration that is at least five percent (5%) of the mass concentration of the monomer compound. In this embodiment, the smoke produced mainly comprises thermal decomposition products of the initiator compound. The initiator may also decompose exothermically. The by-product that results from smoke generation in this embodiment is a solid material that will slowly degrade over time if exposed to outside conditions.
- In a typical polymer reaction, the initiator concentration controls the chain length of the produced polymer. Also, in a typical polymer reaction, the initiator is consumed, chemically bonded to the polymeric molecules. In this type of smoke producing reaction the objective, at a minimum, is to decompose and volatilize initiator as well as additives and /or portions of the monomer itself.
- Frontal polymerization (FP) is a process in which the reaction propagates directionally through the reaction vessel because of the coupling of thermal transport and the Arrhenius-dependence of the kinetics of an exothermic reaction. Frontal polymerization is very much like a flame but propagating through condensed materials instead of a gas. In frontal polymerization reactions, the components are premixed, but stable until initiated by an external source. For example, consider a 2-part epoxy: as soon as the two components are mixed, an exothermic reaction is initiated). As another example, RTV type polymers will self-initiate once exposed to oxygen. The reactions developed here operate differently than either of these or similar types of examples.
- Frontal Polymerization is a form of self-propagating high-temperature synthesis (SPHTS). Here the term "high-temperature" is used to indicate higher than ambient temperature, but certainly lower in temperature than pyrotechnic igniters used in current smoke grenades. In FP as in the case of SPHTS the system will not start reacting until sufficient energy is applied to the material to get a reaction front propagating through the system. This self-propagating wave moves rapidly through the system as long as sufficient heat is generated at the propagation front. Thus, these systems are inherently stable until a sufficient amount of energy is added to start the reaction. Materials with high heat capacity can be incorporated into the mixture. Thus, the system can be turned such that the heat released does not lead to excessive heating of the surrounding environment, thereby reducing incendiary hazards. In other words, the addition of filler materials has the effect of reducing the front temperature and thereby reducing the incendiary hazard since the "excess" heat generated can be "absorbed" in the material itself and not transmitted to the environment.
- The reactants used in the smoke producing compounds disclosed herein have reaction temperatures in the range of 300-400°C. (However, as indicated above, the reaction temperature may be tuned to above ambient to 400° C). Thus, even with combustible, low heat capacity materials it is difficult for a device using these materials, particularly the exposed, exterior, material to get above the temperatures necessary to cause structural materials, such as wood, to combust. It is also unlikely that if there were an accidental activation of a device during storage that other devices in the same container would ignite or that other storage containers would be breached. In addition, the manufacture of devices with lower energetic materials is also much less hazardous that current pyrotechnic based devices.
- In a typical polymerization compound to make a polymer, the initiator concentrations are on the order of 1% or less by mass. This concentration is expressed in polymer literature as 1 pph (parts per hundred of the monomer). As an example, a 10 gram sample with 20 pph initiator and 10 pph fumed silica contains 10 grams of monomer, 2.0 grams of initiator, and 1.0 grams of fumed silica. In experimental testing of the smoke producing compound of the present disclosure, it was found that increasing the amount of initiator in the compound increased the amount of smoke produced.
- Smoke production is caused by a decomposition of the monomer-initiator pair in the smoke generation compound. The fact that smoke production comes from the monomer-initiator pairs has advantages. First, lower reaction temperatures can be used because higher temperatures are not required to volatize a third component in the mixture. Since the initiator is the source of the smoke in this embodiment, it is only necessary to have a sufficient reaction temperature to sustain the initiator decomposition reaction. Also, a higher efficiency of smoke production can be achieved. Since the smoke is due to the initiator and no longer to a third component the "extra" mass was no longer necessary. The monomer itself may decompose, leading to additional smoke production.
- In a first aspect, a composition for the non-pyrotechnic generation of capsaicinoid-containing smoke is provided, the composition comprising: a monomer compound that exothermically polymerizes upon initiation with an initiator compound; an initiator compound that initiates polymerization of the monomer compound, said initiator present at a mass concentration that is at least double the mass concentration of the monomer compound; and a capsaicinoid compound in an amount effective to produce an organoleptic effect in the smoke.
- In a second aspect not forming part of the invention, a method of generating capsaicinoid-containing smoke is provided, the method comprising initiating a frontal polymerization reaction by heating the composition above to a sufficient temperature, and generating smoke comprising the capsaicinoid and thermal decomposition products of the initiator compound.
- In a third aspect not forming part of the invention, a non-pyrotechnic capsaicinoid smoke generator is provided, said smoke generator comprising: a support member having a length and a width; the composition above supported by the support member; an ignition wire in contact with the composition; and a source of electric current connected to the ignition wire.
- The above presents a simplified summary in order to provide a basic understanding of some aspects of the claimed subject matter. This summary is not an extensive overview. It is not intended to identify key or critical elements or to delineate the scope of the claimed subject matter. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
- The disclosure can be better understood with reference to the following drawings. The elements of the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the disclosure. Furthermore, like reference numerals designate corresponding parts throughout the several views.
-
Fig. 1 is a functional schematic of an exemplary test performed to measure the characteristics of a smoke producing sample, -
Figs. 2a - 2f show a series of photographic measurements showing the smoke density increase as increasing amounts of sample smoke producing material are activated. -
Fig. 3 is plot of the optical density versus time for a variety of smoke producing compositions under test. -
Fig. 4a is a schematic of a hypothetical mechanism of the decomposition pathway of the Luperox® 231. -
Fig. 4b is a schematic of a hypothetical mechanism of the decomposition pathway of the mono- and di-function monomer impurities in the commercial grade TMPTA. -
Fig. 5 illustrates the results of an additional series of tests run with concentrations approaching 50 pph. -
Figs. 6a - 6c illustrate the tests performed to analyze initiation of a smoke producing reaction to measure the amount of smoke produced when the reaction was initiated from the front of a smoke producing sample contained in a glass vial. -
Figs. 7a - 7c illustrate the tests performed to analyze initiation of a smoke producing reaction. -
Fig. 8 illustrates a plurality of cylindrical shapes tested in a series of trails of the smoke producing composition. -
Fig. 9 is a photograph of a test setup from a series of tests of the smoke producing composition spread out on a section of lumber. -
Fig. 10 illustrates the visible absorption spectrum of the smoke produced from the TMPTA-Luperox 231 reaction from the start of the reaction to about 20 minutes after is shown. -
Fig. 11 illustrates the infrared absorption spectrum of the smoke produced from the TMPTA-Luperox 231 reaction from the start of the reaction to about 9 minutes after the reaction. -
Fig. 12 depicts a stacked disked embodiment of a smoke generating device. -
Fig. 13 depicts an embodiment of a smoke producing device comprising a substrate formed from a single sheet of material, rolled into a spiral shape. -
Fig. 14 depicts a "stacked spiral" arrangement in which a plurality of spiral substrates are stacked atop one another. -
Figs. 15a, 15b and 15c depict an embodiment of a smoke producing device in which a plurality of cylindrical petals are arranged "concentrically" inside a cylindrical container that is hinged on one side. - The disclosure provides compositions for producing smoke. The smoke may contain one or more capsaicinoid compounds. Various embodiments of the compositions disclosed herein have advantages over previously known smoke-producing compositions; for example: low or no flame front (safe to use indoors, outdoors, and in training environments with flame hazards); low toxicity of the smoke and any non-smoke residues; environmentally friendly (little to no residue or hazardous byproducts); high packing density; high smoke yield/low agglomeration of smoke particles; easily aerosolized, rapid smoke generation (short time constant); good obscuration properties in the visible portion of the electromagnetic spectrum; long smoke durations with appropriate buoyancy; and good shelf life (i.e., after mixing components, the mixture does not self-initiate polymerization).
- In general, there are a minimum of two components - a monomer and an initiator - required to achieve polymerization. In the present embodiment, the monomer provides the carbon compounds that will form the polymer chains and the initiator provides a mechanism to join the carbon compounds together. The baseline monomer used in the composition of the present disclosure is TMPTA (trimethylolpropane triacrylate). Other monomers are possible and it is possible to combine other materials with the monomer for various effects. For example, by combining TMPTA with dibutyl phthalate, a large amount of smoke can be generated, but the smoke is not as buoyant as with TMPTA only. It may be possible to develop a smoke with tailorable buoyancy - which is useful if it is desired to reduce the duration of the smoke. Currently, in an enclosed environment, the smoke producing compound of the present disclosure can result in smoke durations in excess of 20 min. Note that the monomer may also be a material with a backbone other than carbon; for example, the Silicon backbone in Silicone caulk or RTV sealant. In addition, the production of a polymer is not a necessity. The primary role of the monomer is that it provides the heat source so that the reaction proceeds in a timely manner. In Frontal Polymerization, as opposed to other polymerization mechanisms, the mixed monomer and initiator are stable until an external excitation source is added.
- For example, by combining TMPTA with methyl benzoate, benzyl benzoate, and pentyl acetate, considerable amounts of smoke are produced but they have slightly less buoyancy than TMPTA only. This may result in the ability to tailor the buoyancy. These materials are esters used as food additives / aromatics. An additional reason for employing TMPTA monomer in the smoke mixture is that it is a good, high quality (purity), inexpensive monomer.
- The baseline initiator for the smoke producing compound of the present disclosure is Luperox®-231 (1,1-Bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane). Other initiators are possible but may have, or are shown to have, undesirable effects. For example, t-butyl peroxybenzoate may be used with good smoke generation results. However, the benzoic acid byproducts are considerably more hazardous than the trimethyl cyclohexanes (TMCH) generated with the baseline initiator. The trimethyl cyclohexane smoke product or byproduct is not an acid or acid forming material. According to the toxicity analysis the inhalation and LD50 thresholds of TMCH are much higher than for the currently used materials (HC and RP).
- One embodiment of the smoke producing compound of the present disclosure requires two other components: an ignition mechanism and a filler. The ignition (or initiation) mechanism used in the testing disclosed herein was a heat source. The heat source does not have to, but can, be pyrogenic. To date, Estes model rocket igniters, simple nichrome wire loops attached to voltage sources, hot air from a heat gun, soldering iron tips, open flame, focused intense light, have all been used to initiate the FP reaction. This ignition mechanism list is not exhaustive. Other ignition mechanisms considered are: piezo devices that might be used to ignite something more pyrogenic such as cannon fuse, battery powered voltage sources for nichrome wire, etc. A mixture including monomer and initiator will not self-initiate without an ignition source - this contributes to the long shelf life and inertness of the material.
- Ignition tests have been conducted with a 1" conduction loop of 30 gauge nickel-chromium (NiCr, or nichrome) wire with a resistance/unit length of approximately 0.5 Ohm/in. The wire was buried slightly under the surface of the smoke producing composition (which is typically in gel form) and a current draw of approximately 1 Amp was sufficient to initiate the FP reaction. Using Power, P = I2R, where I is the current in Amps and R is the resistance in Ohms, this yields an input Power of P = (1 Amp)2(0.5 Ohm) = 0.5 W.
- In the current embodiment (for an application such as smoke grenade usage), the filler provides a mechanism, or a matrix, for the smoke mixture to have a shape other than that provided by its container (e.g., a liquid or gas assumes the shape of its container, but a solid or a gel may not). Fumed silica, kaolin (clay) powder, and powdered sugar have all been used as fillers. Fumed silica has provided the best performance - the mass required is low, it has a high area-mass ratio which provides significant thickening with a low thermal mass. This prevents it from robbing the reaction of the heat required for the reaction to propagate. Increasing the amounts of kaolin powder and powdered sugar have been shown to rob the reaction of its necessary heat and reduce the amount of smoke.
- There are other envisioned applications where the smoke mixture is left as a liquid - so the filler / thickening agent might not be required or might be detrimental to the application. An example of a situation in which the thickening agent is not required: A liquid smoke mixture is carried on a military robot. If an individual approached too close to the robot, the liquid would be sprayed onto a hot surface (i.e., hot plate or wire) located somewhere on the robot. This would generate a signaling / deterrent smoke. In addition, this might not require large temperatures to initiate the reaction so that the smoke generation mechanism is not an incendiary hazard to the robot or to the local environment.
- The primary mixture components of the smoke producing composition also have enough thermal conductivity that, if a point ignition source is applied, the bulk mixture reactants may quickly convect the required reaction energy away from the reaction site and cause the reaction to quench itself. The very low thermal conductivity of fumed silica "insulates" the reaction region, preventing the heat of reaction or of initiation from convecting away too rapidly. When no filler is present a large area heat source, such as a heat gun, may be required to inject significant heat into the mixture to overwhelm the convective heat losses. Present experimentation has shown cases where, for all other mixture components held constant, increases in filler (fumed silica) have resulted in a higher absorption smoke. The filler may provide more nucleation sites for polymerization to initiate.
- In one embodiment of the smoke producing compound, if X g of TMPTA monomer is used, then greater than 0.1 X g of Luperox® 231 initiator, and greater than or equal to 0.1 X g of fumed silica filler are to be used. This mixture would be considered a "greater than 10 pph" mixture (greater than 10 parts initiator to .100 parts monomer). Note that the initiator concentration may be allowed to approach infinity (i.e., no monomer) and still generate smoke. The initiator may also decompose exothermically. In comparison, ratios for standard reactions wherein the polymerization product, not the smoke product, is desired, are characterized by initiator concentrations utilizing much less than 10 pph - typically 0.01 pph - 0,1 pph, but less than 1 pph.
- The TMPTA (trimethylolpropane triacrylate) is a trifunctional monomer. This means that there are three double-bond carbon ends associated with each monomer molecule. Typical monomer-polymer system include compounds that have a single carbon double-bond along the monomer chain; ethylene, styrene, vinyl chloride. A single initiator molecule causes the breaking of the double bond and a monomer free radial to be formed. This monomer free radical then reacts with other monomers and a polymer molecule begins to grow. Termination of the process occurs when two free radicals combine; either a second polymer free radical or the other half of the initiator molecule. Polymer molecules of 1000 to 100,000 monomers are commonly produced. One of the controlling parameters of the final chain length is the number of initiator molecules added. Thus, typical initiator concentrations are a few hundredths to millionths of percent; high initiator concentrations yield low molecular weight polymer molecules. The heat generated from the polymerization process is due to the breaking of the carbon double bond and the formation of a carbon single bond. This process releases 60kJ of energy per mole of double bonds. The process temperature of the reaction depends on the heat capacity of the monomer molecules. Molecules such as poly(ethylene) C2H4 have a much lower heat capacity than molecules such as styrene C8H10 and have much higher reaction temperature since they both have a single double-bonded carbon that participates in the reaction.
-
- Capsaicinoids tend to share the 4-hydroxy-3-methoxyphenyl methyl group but vary in the structure of the hydrocarbon tail bound to the amide moiety. For example, some capsaicinoids lack double bonds in the hydrocarbon tail, others lack the pendant methyl group, other vary the location of the unsaturated carbons, in still others the length of the hydrocarbon tail varies from about 7 to about 9 carbons (not counting pendant groups). Loosely defined, a capsaicinoid is any ester of vanillamine having a hydrocarbon tail at least 5 carbons in length.
- The capsaicinoid is one that is exerts an organoleptic effect on the intended target (which will be a mammal). In this context "organoleptic" means producing a sensible effect, such as a burning sensation. The effect may be an irritant effect, meaning an effect that is at least painful. The irritant effect may also be one or more of ocular redness, ocular pain, lacrimation, blepharospasm, blindness, respiratory tract irritation, mucous membrane irritation, coughing, wheezing, intranasal pain, throat pain, laryngitis, headache, nausea, vomiting, runny nose, and shortness of breath.
- Examples of capsaicinoids known to exert organoleptic or irritating effects include capsaicin, dihydrocapsaicin, nordihydrocapsaicin, homocapsaicin, homodihydrocapsaicin, and nonivamide. Salts, esters, and other derivatives of the capsaicinoid may be used, so long as the derivative has the desired organoleptic or irritant properties. The organoleptic properties of capsaicinoids (and other substances) are generally measured in the art by the method of Scoville (1912) J. Am. Pharm. Assoc, vol. 1, pp. 453-454 The method involves extracting one grain (64.8 mg) of the sample in 100 mL of ethanol; then serially diluting the extract in water. The serial dilutions are tasted by a panel of tasters, until the highest dilution in which the substance can be tasted is identified. The ratio of water to the ethanol extract in said highest tasteable dilution is the potency of the sample in "Scoville Heat Units" (SHU). In any instance in which a value or range of SHU is claimed, such value or range is based on the method of Scoville (1912). Various capsaicinoids have been assigned standard SHU values, as follows (a commonly eaten variety of Capsicum annuum has been included for reference):
TABLE 1: EXEMPLAR CAPSAICINOIDS AND THEIR SHU VALUES Compound SHU Capsaicin 1.6 x 107 Dihydrocapsaicin 1.5 x 107 Nonivamide 9.1 x 106 Nordihydrocapsaicin 9.1 x 106 Homodihydrocapsaicin 8.6 x 106 Homocapsaicin 8.6 x 106 Jalapeño pepper 5-20 x 103 - The concentration of the capsaicinoid in the composition may also be designed to achieve a target SHU or SHU range. For example, some embodiments of the composition are at least 105, 1.6x105, or 106 SHU. Further embodiments of the composition contain the capsaicinoid at 1.6x105 to 3.2x106, 3.2x105 to 2.4x106, or 8x106 to 1.6x107 SHU. Specific embodiments of the composition are 8x106 or 1.6x107 SHU.
- The addition of "excess" initiator, in this case Luperox® 231 (1,1-Di-(tert-butylperoxy)-3,3,5-trimethylcyclohexane)), to a trifunctional monomer is against all polymerization practice because it increases the amount of smoke and decreases the quality of the resultant polymer. In fact, the more initiator is added, the poorer the strength of the resultant polymer, because there are more voids, more fractures, etc. During the course of this work it was not clear, until experimental tests were performed, that the polymerization reaction would even occur as increasing amount of initiator were added to the monomer. Increasing the initiator amount beyond the minimum necessary to sustain the polymerization reaction, likely causes an excessive number of polymerization reactions to occur simultaneously in a confined space. The distinct polymers formed by these multiple polymerization reactions will not necessarily bond with other polymers to form longer polymers. The result is that shorter than normally desired polymer chains are formed, resulting in a far weaker polymer product. As the initiator concentration is increased excessively, the polymer product has much shorter chains and is far weaker.
- A series of preliminary experiments were conducted with initiator concentrations from 1 to 15 pph (parts per hundred of monomer). These preliminary tests qualitatively indicated that higher initiator concentrations resulted in increasing smoke yields. More importantly, these tests indicated that high initiator concentrations did not adversely affect the rate of the polymerization process and that sufficient heat was generated for the initiator to decompose into a visible smoke.
-
Fig. 1 is a functional schematic of an exemplary test performed to measure the characteristics of asmoke producing sample 101 in achamber 100. Thechamber 100 was substantially one (1) cubic foot in volume (11" x 12" by 10"). Specifically, a Fisher Scientific® Dry Box was used as an airtight chamber 100 in this test. An FP reaction of thesample 101 was remotely initiated via awire 108 extending through the chamber wall and to a power source (not shown). Afan 106 inside thechamber 100 circulated the smoke (not shown) produced by the reaction. Visible spectra measurements were taken with an Ocean Optics HR2000 UV-Visspectrometer 102. The optical cell (not shown) was a Starna 34-SOG-100 10cm cell. Infrared spectra were determined with aNexus470 FTIR 103 using a 4" pathlength cell (not shown) with KBr windows (not shown). - The
chamber 101 comprised atransparent window 107 to allow visual access to the sample under test for viewing the smoke and measuring smoke parameters. Avent hood 104 collected fumes from the test and avent 105 vented fumes outside of the building. - In a similar test of the smoke producing sample, a 50 ft3 PVC and plastic wrapped chamber (not shown) was constructed. Two clear plastic windows 204 (
Fig. 2a ) on the chamber 200 (Fig. 2a ) provided for optical measurements and visualization of the smoke production. - A series of experiments were completed in both the 1 ft3 and 50 ft3 chambers to test the limits of smoke production with increasing initiator concentration. Measurements of smoke production versus initiator concentration from 5 to 50 pph have been made in the 1 ft3 chamber and from 5 to 25 pph in the 50 ft3 chamber. For tests in both the 1 ft3 and 50 ft3 chambers optical transmission measurements (l/l0) were made versus time using a 633nm laser and Newport laser power meter. From these tests it was determined that increasing the initiator concentration to at least 25-30 pph gave a good smoke production reaction and that increasing to 50 pph would continue to produce more smoke. Tests were run to quantify the amount of material necessary to produced a dense enough smoke for obscuration. A series of tests using different sample weights with 25 pph starting material versus optical density were run in the 50ft3 chamber. The amount of material was increased from 5 to 25 grams of monomer (all with 25 pph of initiator); this corresponds to 0.1 to 0.5 grams of monomer per ft3 of chamber volume.
-
Figs. 2a - 2f show a series of photographic measurements showing the smoke density increase as increasing amounts of sample smoke producing material are activated. A laser power meter 201 measured optical transmission of smoke in thechamber 200. Tape 203 defined a rectangular transparent window 204. Two tape strips 202 were mounted horizontally on the opposite inside side wall of the chamber. As can be seen inFig. 2a , which illustrates thechamber 200 before a smoke producing reaction is initiated, the tape strips 202 are clearly visible through the window 204. However, as smoke concentration increases, as shown inFig 2b , in which the smoke density is 0.10 grams monomer per cubic foot, the tape strips 202 become less visible. The beam 207 from the laser power meter 201 is clearly visible inFig. 2b . - In
Fig. 2c , which illustrates a smoke density of 0.15 grams monomer per cubic foot, the tape strips 202 are invisible. InFig. 2d , the smoke density is 0.20 grams monomer per cubic foot. InFig. 2e , the smoke density is 0.25 grams monomer per cubic foot. InFig. 2f , the smoke density is 0.30 grams monomer per cubic foot. - It is notable that the testing illustrated in
Figs. 2a - 2f was performed indoors in plastic containment chambers. This highlights the non-incendiary characteristic of the reaction. The smoke does have an odor to it so the chamber needs to be vented outside. However, an unpleasant odor could be advantageous in some situations where a "stink bomb" might be desired. -
Fig. 3 is a plot of the optical density versus time for the same mass of materials from testing performed in 50ft3 chamber. This figure shows that after about 0.15 grams of starting monomer per cubic foot (gm/ft3), the optical density drops below 0.1. Comparing the results ofFigs. 2c withFig. 3 at 0.15 gm/ft3 the smoke density is almost sufficient to totally obscure the reference tapes 202 (Fig. 2c ) on the opposite wall. As the sample mass increases up to 0.3 gcf the smoke density and its obscurant ability clearly increase. - The photographic series
Figs. 2a - 2f illustrates a quirk of the laser beam visibility: with increasing smoke density, the laser beam 207 actually seems brighter and more visible. This result is also shown in the data ofFig. 3 . The measured optical density for starting sample mass of greater than 0.15 gcf is actually greater than for 0.15 gcf itself, while it is clear from the photographs inFig. 2c - 2f that the smoke is denser. This higher measured optical density is likely due to a multiple scattering phenomena competing with the initial beam absorption/scattering. Note also fromFig. 3 that the duration of the smoke (at least in this controlled environment, i.e., in the absence of driving winds) is considerable. - The starting monomer and initiator in the exemplary testing was TMPTA and Luperox® 231. The expected decomposition products have been analyzed both through a literature review and via Gas Chromotograph-Mass Spectrometer (GC-MS) analysis of the smoke products. The literature review lists as the decomposition products:
- a. 3,3,5-trimethylcyclohexane,
- b. 2,4,4-trimethylcyclohexane,
- c. Trimethylcyclopentane
- d. t-butyl alcohol,
- e. acetone,
- f. methane, and
- g. carbon dioxide.
- Experimental GC-MS analysis essentially confirmed the literature results but showed only three components in the smoke:
- a. 3,3,5-trimethylcyclohexane,
- b. 2,4,4-trimethylcyclohexane, and
- c. t-butyl alcohol.
- Neither acetone nor trimethycyclopentane were detected. The molecular weights and melting and boiling points of some of the decomposition components are listed in Table 2 below. Acetone and Tert-butyl alcohol are gases room temperatures and the trimethylcyclohexane is liquid droplets at room temperature.
Table 2. Molecular weights and melting and boiling points of Luperox® 231 decomposition products Decomposition Product Vapor Species Molecular Weight [g/mole] Melting Point [°C] Boiling Point [°C] 1,3,5-trimethylcyclohexane 126.24 -49.7 138.5 Acetone 58.08 -95 56.2 Tert-butyl alcohol 74.12 25.2 82.2 -
Fig. 4a is a schematic of the decomposition pathway of the Luperox® 231 andFig. 4b is a schematic of the decomposition pathway of the mono- and di-function monomer impurities in the commercial grade TMPTA. In this schematic, dotted lines are cleavage. - From the GC-MS analysis of the smoke produced, the reaction products are trimethylcyclohexane and t-butyl alcohol. The reaction products of the monomer decomposition are not seen in the smoke but may affect its infrared absorption properties.
- A series of tests were performed to measure the mass loss of the sample smoke generation compound versus the amount of initiator used in the compound. These tests were performed to confirm that the majority of the initiator was decomposing, and this expectation was confirmed. For the higher initiator concentrations and for thin (< 1/8") sample thickness, there was more mass loss than just the initiator itself. The significance of sample thickness is discussed further below.
- A series of tests was also performed to determine the mass loss over a wider initiator concentration range, and the initiator concentration was varied from 1 pph to 30 pph. The fumed silica (thickening agent) content was held constant at 10 pph. The starting TMPTA monomer was 2 grams and the mass of the initiator was varied from 0.02 to 0.60 grams. Two to three samples were run for each mixture composition. The results of these tests are presented in Table 3 below,
Table 3. Percent mass loss of monomer-initiator-filler mixtures versus the initial initiator concentration. Initiator Concentration [parts per hundred] 1 5 10 20 30 Percent mass loss (number of samples) 0.5-1 (2) 4.0-5.2 (3) 9.8-13.4 (3) 22-32 (3) 33-49 (2) - As can be seen from Table 3, from about 1 to 5 pph of initiator, the mass loss was approximately proportional to the amount of initiator added. At higher initiator concentrations (greater than 10 pph) the total mass loss was greater than the initiator mass. The additional mass loss -- resulting in more smoke -- is considered to be due to a decomposition of mono-functional, and di-functional "impurities" that are present in the commercial grade TMPTA. The additional mass loss could be due to a decomposition of the tri-functional TMPTA itself, but this is considered to be unlikely.
-
Fig. 5 illustrates the results of an additional series of tests run with concentrations approaching 50 pph. Note that it is unclear whether that the mass loss rate is decreasing at the 50 pph (50%) point. This indicates that it is desirable to perform additional tests with initiator concentrations greater than 50 pph. - The internal temperature of 5 gram samples of the mixed compound was measured in order to better understand the safety, and non-incendiary, characteristics of the frontal polymerization reaction. In initiator concentrations of less than 5 pph, the internal sample temperature was 100-200°C. At initiator concentrations from about 15 to 30 pph, the internal temperature increased to 300-350°C. This temperature is likely sufficient to lead to some decomposition of the monomer itself, which may be helped by the appreciable excess of initiator.
- A series of tests was performed to determine the effect of aspect ratio (width v. length at fixed heights) of the sample versus the amount of smoke produced. These tests were conducted under three testing/operating scenarios, 1) front and rear initiation of the reaction, 2) cylindrical samples of varying aspect ratio, initiated from the top "free" surface, and 3) rectangular samples of varying aspect ratios. Test geometries 1) and 2) were conducted in the one ft3 test chamber and the third series of tests were conducted in the 50 ft3 chamber. The sample smoke producing compound was 10
pph Luperox® 231 and 10 pph fumed silica filler. -
Figs. 6a - 6c illustrate the tests performed to analyze initiation of a smoke producing reaction to measure the amount of smoke produced when the reaction was initiated from the front, expanding portion, of the sample contained in a glass vial. InFig. 6a , thesample 600 is disposed near an openfront end 601 of aglass vial 602. InFig. 6b , thesample 600 has just been ignited.Fig. 6c is a wider view of thesample 600 after the smoke has expanded. The smoke was close to neutrally buoyant and filled the test chamber in an amount that would be expected, given the size of the sample. -
Figs. 7a - 7c illustrate the tests performed to analyze initiation of a smoke producing reaction to measure the amount of smoke produced when the reaction is initiated from a sample disposed in the rear, constrained, portion of a glass vial. InFig. 7a , thesample 700 is disposed near therear end 701 of aglass vial 702. In this series of tests, as shown inFigs. 7b and 7c , any hot smoke vapors have to travel through the unreacted portion of the sample before reaching theopen end 703 of thevial 702. The resultant smoke was denser than the surrounding air and tended to sink to the bottom of the test chamber. In both of the tests illustrated inFigs 6 and7 , the frontal polymerization reaction proceeded to completion. - The second series of trials tested a constant volume of material in three cylinder shapes with bores of different aspect ratios, 2:1, 1:1, 1:3, and 1:5, as illustrated in
Fig. 8 . The cylinder bores were generated by drilling holes in a Delrin puck. A syringe was used to place the samples in the bore holes. These tests showed that the 2:1 aspect ratio sample had the most smoke production; the 1:3 and 1:5 aspect ratio tests produced a minor amount of smoke. The 2:1 aspect ratio test produced a typical amount of smoke. The test results are reported in Table 4 below. In each of these tests, the reaction was initiated at the top of the sample with enclosed sides and bottom. The conclusion from these tests is that a low aspect ratio of height to diameter is desirable.Table 4. Optical transmittance of smoke produced for various aspect ratio cylindrical samples Sample Aspect Ratio [diameter to height] Sample Diameter [inches] Optical Transmittance [1/10] 2:1 1 0.20 1:1 5/8 0.8 1:3 1/2 0.97 1:5 1/4 1.0-no signal loss -
Fig. 9 is a photograph of a test setup from the final series of tests, which were conducted with 10 gram samples (20 pph initiator, 10 pph silica), spread out on a section oflumber 900. Selected thicknesslumber guide rails 901 were spaced about one inch apart, the guide rails were varied from 3/16 inches in height, to ¼" in height to ½" in height, and the sample 902 (shown after the reaction) was spread out to roughly 1.5 to 4 inches long between the guide rails. Note that the inFig. 9 lumber shows no signs of combustion and in spite of the fact that it has been used for several dozen tests. The measured optical density values are given in Table 5 below. These results confirm that the layer thickness play a critical role in the efficiency of smoke produced.Table 5. Optical transmittance measurements versus aspect ratio and sample thickness for fixed mass samples. Sample Aspect Ratio [height to length] Sample Thickness [inches] Sample Length [inches] Optical Transmittance [l/l0] 1:20 3/16 ∼4 0.10 1:12 1/4 ∼3 0.25 1:3 1/2 ∼1.5 .98-no signal loss - A series of tests were conducted with TMPTA and initiators other than Luperox® 231 and tests of monomers other than TMPTA to confirm that the smoke production was due to the decomposition of the Luperox® 231 and to confirm the effectiveness of TMPTA as the monomer. These tests were only run for qualitative, rather than quantitative smoke production assessment. The mixture composition was 10 pph initiator and 10 pph fumed silica. Table 6 shows the results of these tests.
Table 6. Monomer-Initiator combinations tested for their qualitative smoke production ability. Initiators Monomers Luperox® 231 t-butyl peroxybenzoate TMPTA (Trimethylolpropane triacrylate) Good smoke-Control sample Similar to Control TMPTA+dibutyl phthalate Good or better smoke-smoke sinks No Test PETA (Petaerythritol triacrylate) Poor smoke Poor smoke DTMPTA (Di(trimethylolpropane) triacrylate) Poor or no smoke No smoke - The results in this table highlight the fact that the Luperox® 231/TMPTA initiator/monomer combination is rather unique in its ability to produce large volumes of smoke. The t-butyl peroxybenzoate initiator did produce good quality of smoke. However, one of its reaction products would be benzoic acid. Thus, a smoke from this initiator would have a much higher toxicity than the methylcyclohexanes from Luperox® 231. The TMPTA+dibutyl phthalate mixture did produce a good quality, albeit sinking, smoke.
-
Fig. 10 illustrates the visible absorption spectrum of the smoke produced from the TMPTA-Luperox 231 reaction from the start of the reaction to about 20 minutes after is shown. The data was taken using the one ft3 chamber that was connected to the Ocean Optics spectrometer through flow-ports installed in the back of the chamber. This figure shows that the smoke produced has a uniform absorption across the (entire) visible spectrum from 300-1000 nm. Thus, it evenly scatters all the visible wavelengths. It can also be seen in the figure that the smoke has a persistence of at least 5 minutes. From this data and from other tests this indicates that the particle sizes are in a range where there is not rapid sedimentation of the particles or droplets. -
Fig. 11 illustrates the infrared absorption spectrum of the smoke produced from the TMPTA-Luperox 231 reaction from the start of the reaction to about 9 minutes after the reaction. The data was taken using the 1 ft3 chamber that was connected to the Nexus 470 FTIR system through flow-ports installed in the back of the chamber. The infrared cell has KBr windows. The infrared spectrum has unique peaks associated with the trimethylcyclohexane, t-butyl alcohol, and acetone produced in the reaction. The infrared peak from a human body is centered around 10m; indicating that the current version of this smoke is not an infrared obscurant for humans. The absorption peaks at approximately 6, 7 and 8 m indicate that the smoke has obscurant properties for 225, 150, and 100°C bodies. No efforts were made during the Phase I research to modify the reaction products to make the smoke obscure humans. - The toxicity of the decomposition products has been analyzed from the MSDS data that is available for the initiator decomposition products: trimethylcyclohexane, tert-butyl alcohol, and acetone. Values for the known decomposition products of our formulation and current inventory grenades are given in Table 7 below. While excessive exposure to acetone and ter-tbutyl alcohol should be avoided, these compounds are the primary component of many household products such as nail polish remover. Table 7 below shows that the decomposition products of the smoke producing formulation disclosed herein are substantially less toxic or reactive than presently used compounds. (Hexachloroethane and phosphoric acid are included as reference materials.)
Table 7. Toxicity and workplace exposure data for Luperox® 231 decomposition products. LD50 [mg/kg] Exposure limit [(mg/kg)/time-hrs] notes trimethylcyclohexanes No data No data 3 TWA 2000 mg/m3Chronic effect on humans-toxic to lungs methylcyclohexane 2,250-oral 7613 vapor-4 hours Chronic effect on humans-toxic to lungs tert-butyl alcohol 2,743-oral 10,000 vapor-4 hours may cause reproductive system damage acetone 3000-oral 44,000 vapor-4 hours may cause CNS damage hexachloroethane (M8 HC) 4,900-oral No data, but known respiratory irritant TWA-10mg/m3 Confirmed animal carcinogen, very toxic to aquatic life-long lasting Terephthalic acid (M83 TA) 3200 TWA-10mg/m3 Chronic toxicity to multiple organ systems phosphoric acid 1550-oral 850 vapor - 1 hour TLV-1mg/m3 LD50 = Median Lethal Dose
TWA = Time Weighted Average
TLV = Threshold Limit Value - Questions have been raised as to whether adding oxiders to the mix would it speed up the reaction and make smoke faster. The composition is not incendiary, and adding (inorganic) oxidizers to the mix may cause it to start a fire, which would be undesirable. Therefore, the composition avoids inorganic oxidizers. The smoke in the composition is produced from the decomposition of the initiator in the composition, which can be thought of as an/the oxidizer. The composition differs from currently known formulations in that it is this "oxidizer" that makes the smoke. Adding an inorganic oxidizer would likely cause the smoke production to decrease.
- The desired smoke production requires approximately 0.020 grams of material per cubic foot of obscured volume when viewed through a 10 m thick smoke screen. For a 5 m thick smoke screen 0.04 grams / cu. ft. of material are required, The obscurant factor is constant across the visible spectrum, and has infrared absorption in specific wavelength ranges. Assuming ideal and complete reaction efficiency, for a 300 m3 (3m×10m×10m or 10,600 ft3) obscured volume, approximately 200 cm3 of material is projected to be required, representing a device approximately 4 inch in height and 2 inches diameter; without casing, fuse or ignition source. Analysis of the mechanism of smoke production indicates a strong potential that a smoke could be produced with 0.010-0.015 grams of material per cubic foot of required coverage. The casing and fusing requirements will result in a final device size of generally 5 inches in height and about 3 inches diameter; which represents devices currently in the inventory.
- It is unlikely that the local oxygen concentration has any effect on the amount of smoke produced. Based upon the decomposition mechanism of the Luperox® 231, oxygen is not required. It is currently unknown whether extra mass loss from the mono- or di-functional monomers requires oxygen or not.
-
Fig, 12 depicts an embodiment (not part of the invention) of asmoke generating device 1100 using the compound disclosed herein. In this "stacked disk arrangement," the smoke generating compound (not shown) is applied todisks Fig. 11 , this number of disks is illustrated for explanatory purposes; asmoke generating device 1100 may comprise 10-30 stacked disks, or more or fewer, as desired. - In this embodiment, each disk 1101 -1105 is formed from non-woven fiber, such as a plastic fiber similar to Scotch Brite® pads or a plastic Brillo® pad, or fiberglass. The disks 1101 -1105 may also be formed from other materials with a high surface area for maximizing the composition's exposure to oxygen during the smoke-producing reaction.
- An ignition wire 1106 extends through
openings 1107 in the disks 1101 - 1105 for initiating the reaction. In other embodiments, the ignition wire 1106 may be "woven" into the fiber comprising the disk. -
Wires wire 1108 extends betweendisk 1101 anddisk 1102;wire 1109 extends betweendisk 1102 anddisk 1103;wire 1110 extends betweendisk 1103 anddisk 1104;wire 1111 extends betweendisk 1104 anddisk 1105, - In some embodiments, insulators (not shown) are disposed between adjacent disks to isolate each disk from the remaining disks, to prevent the disks from sticking together.
-
Fig. 13 depicts an embodiment (not part of the invention) of a smoke producing device comprising asubstrate 1300 formed from a single sheet of material, rolled into a spiral shape as shown. Thesubstrate 1300 may be formed from the materials discussed above with respect toFig. 12 . Anignition line 1301 extends through thesubstrate 1300. -
Fig. 14 depicts a "stacked spiral" arrangement in which a plurality ofspiral substrates 1400 like those discussed above with respect toFig. 13 are stacked atop one another. Each substrate comprises anignition line 1401. -
Figs. 15a, 15b and 15c depict an embodiment (not part of the invention) of a smoke producing device in which a plurality ofcylindrical petals cylindrical container 153 that is hinged on one side via ahinge 154.Figs. 15a and 15b depict thecontainer 153 before the smoke producing ignition is initiated, andFig. 15c depicts thecontainer 153 after the ignition has begun. Although threepetals - The ignition sequence causes the
container 153 to be split so that it opens up along ahinge line 155 of thecontainer 153. The concentrically arrangedpetals petals Fig. 12 above. - A first test was performed by adding commercially available oleoresin capsicum (ethanol extract from Capsicum fruit) to a non-pyrotechnic smoke composition comprising 10% w/w monomer, 10% w/w fumed silica filler, and 80% w/w initiator. The oleoresin capsicum was added to the non-pyrotechnic smoke composition at a ratio of 1 part oleoresin capsicum to 10 parts smoke composition by weight. A frontal polymerization reaction was initiated in 10 g of the mixture placed in an
enclosed shipping container 8 feet (2.44 m) by 10 feet (3.05 m) by 40 feet (12.19 m) (90.7 m3). Smoke production was observed to be very slow. When two human test subjects approached the shipping container after the completion of smoke production, they were immediately repelled upon contact with the smoke. The subjects coughed and reported irritation of the sinuses and lungs. The test was repeated using a mixture at a ratio of 1 part oleoresin capsicum to 20 parts smoke composition by weight. Smoke production was not slowed. However, the test subjects were able to tolerate contact with the smoke for several minutes. - A second test was performed using crystalized capsaicin in place of capsicum oleoresin. Capsaicin was added to the same smoke composition at a ratio of 1 part capsaicin to 10 parts smoke composition by weight. A frontal polymerization reaction was initiated in 10 g of the mixture placed in an enclosed warehouse 25 feet (7.62 m) by 25 feet (7.62 m) by 25 feet (7.62 m) (442.5 m3). The rate of smoke production did not appear to be affected by the addition of the capsaicin. When two human test subjects approached the warehouse after the completion of smoke production, they were immediately repelled upon contact with the smoke. The subjects coughed severely and reported burning irritation of the eyes and nasal passages. The test was repeated using a mixture at a ratio of 1 part capsaicin to 20 parts smoke composition by weight with similar results.
Claims (15)
- A composition for the non-pyrotechnic generation of capsaicinoid-containing smoke, the composition comprising:(a) a monomer compound that exothermically polymerizes upon initiation with an initiator compound;(b) an initiator compound that initiates polymerization of the monomer compound, said initiator present at a mass concentration that is at least 5% the mass concentration of the monomer compound; and(c) a capsaicinoid compound in an amount effective to produce an irritant effect in the smoke.
- The composition of claim 1, wherein the initiator present at a mass concentration that is at least 10% the mass concentration of the monomer compound.
- The composition of claim 1 or claim 2, wherein the initiator is present at a mass concentration that is at least double the mass concentration of the monomer compound.
- The composition of any one of claims 1-3, wherein the composition is at least 105 SHU.
- The composition of any one of claims 1-4, wherein the composition is at least 106 SHU.
- The composition of any one of claims 1-5, comprising a filler agent.
- The composition of any one of claims 1 -6, comprising an infrared-opaque agent.
- The composition of any one of claims 1-7, wherein the composition is not fluid.
- The composition of any one of claims 1-8, wherein the composition is not fluid, and wherein the composition is formed to allow the propagation of a frontal polymerization reaction.
- The composition of any one of claims 1-9, wherein the monomer compound is TMPTA.
- The composition of any one of claims 1 -10, wherein the initiator compound is selected from the group consisting of: di-tert-butyl peroxide, tert-butyl peroxybenzoate, tert-butyl hydroperoxide, and cyclohexyl hydroperoxide.
- The composition of any one of claims 1-11, wherein the initiator compound is tert-butyl peroxybenzoate.
- The composition of any one of claims 1-12, further comprising at least 2% mass concentration of fumed silica.
- The composition of any one of claims 1-13, comprising dibutyl phthalate.
- The composition of any one of claims 1-14 comprising a heat source to activate the initiator compound.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/482,481 US10941086B2 (en) | 2012-05-07 | 2017-04-07 | Capsaicinoid smoke |
PCT/US2018/026731 WO2018187809A1 (en) | 2017-04-07 | 2018-04-09 | Capsaicinoid smoke |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3606893A1 EP3606893A1 (en) | 2020-02-12 |
EP3606893B1 true EP3606893B1 (en) | 2021-02-24 |
Family
ID=62152633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18724372.0A Active EP3606893B1 (en) | 2017-04-07 | 2018-04-09 | Capsaicinoid smoke |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3606893B1 (en) |
AU (1) | AU2018249955B2 (en) |
CA (1) | CA3056808A1 (en) |
WO (1) | WO2018187809A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2813549C1 (en) * | 2022-11-15 | 2024-02-13 | Акционерное общество "Федеральный научно-производственный центр "Научно-исследовательский институт прикладной химии" | Liquid composition with irritant action (embodiments) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021237024A1 (en) * | 2020-05-21 | 2021-11-25 | Knowflame, Inc. | Disinfectant system |
WO2023091752A1 (en) * | 2021-11-19 | 2023-05-25 | Polaris Sensor Technologies, Inc. | Pesticide system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1886394A (en) * | 1927-02-24 | 1932-11-08 | Lake Erie Chemical Company | Dense opaque smoke and irritating fume and gas producing chemicals |
ES2302620B1 (en) * | 2006-07-10 | 2009-05-07 | Falken S.A. | FUMIGENA MIX, IGNITION COMPOSITION AND DEVICE FOR YOUR STORAGE. |
US9617195B2 (en) * | 2012-05-07 | 2017-04-11 | Polaris Sensor Technologies, Inc. | Low flame smoke |
FR3018277B1 (en) * | 2014-03-07 | 2016-04-15 | Etienne Lacroix Tous Artifices S A | INCAPACITANT FUMIGENE COMPOSITION COMPRISING MICROENCAPSULATED OLEUM CAPSICUM RESIN |
-
2018
- 2018-04-09 WO PCT/US2018/026731 patent/WO2018187809A1/en active Application Filing
- 2018-04-09 EP EP18724372.0A patent/EP3606893B1/en active Active
- 2018-04-09 CA CA3056808A patent/CA3056808A1/en active Pending
- 2018-04-09 AU AU2018249955A patent/AU2018249955B2/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2813549C1 (en) * | 2022-11-15 | 2024-02-13 | Акционерное общество "Федеральный научно-производственный центр "Научно-исследовательский институт прикладной химии" | Liquid composition with irritant action (embodiments) |
Also Published As
Publication number | Publication date |
---|---|
AU2018249955B2 (en) | 2021-12-09 |
EP3606893A1 (en) | 2020-02-12 |
WO2018187809A1 (en) | 2018-10-11 |
AU2018249955A1 (en) | 2019-10-10 |
CA3056808A1 (en) | 2018-10-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2847145B1 (en) | Low flame smoke | |
US20210147313A1 (en) | Capsaicinoid smoke | |
US20140238258A1 (en) | Colored Pyrotechnic Smoke-Producing Composition | |
EP3606893B1 (en) | Capsaicinoid smoke | |
ES2589752T3 (en) | Pyrotechnic generator of colored flames | |
CN108578945B (en) | Aerosol extinguishing patch | |
AU2005305380A1 (en) | Improved flame suppressant aerosol generant | |
JP2007521111A (en) | Manual fire extinguisher | |
Shehata | A new cobalt chelate as flame retardant for polypropylene filled with magnesium hydroxide | |
US20020137875A1 (en) | Fire suppressing gas generator composition | |
US20160115090A1 (en) | Pyrotechnic yellow smoke compositions based on solvent yellow 33 | |
KR100265094B1 (en) | Castable infrared illuminant compositions | |
EP2468700A2 (en) | Pyrotechnic decoy material for infra-red decoys | |
RU2392993C1 (en) | Pyrotechnic aerosol-forming compound | |
CN116159276A (en) | Self-cooling flameless hot aerosol fire extinguishing agent and preparation method thereof | |
RU2230726C2 (en) | Aerosol generation pyrotechnic composition for systems performing volumetric fire-extinguishing | |
Sabatini | Advances toward the development of “Green” pyrotechnics | |
RU2214848C1 (en) | Aerosol-generating energetic polymeric composite for system of volume fire extinguishing | |
Talawar et al. | Synthesis, characterization, thermolysis and performance evaluation of mercuric-5-nitrotetrazole (MNT) | |
CN107108389B (en) | O-chlorobenzylidene malononitrile (CS) type self-igniting pyrotechnic composition with low ignition temperature | |
US20180016202A1 (en) | Obscurant compositions | |
Oliveira et al. | Assessment of the synthesis routes conditions for obtaining ammonium dinitramide by the FT-IR | |
US2633455A (en) | Smoke generator | |
JP6795368B2 (en) | Smoke agent composition | |
US6521064B1 (en) | Pyrotechnic burster composition |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20191031 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20200918 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 1364250 Country of ref document: AT Kind code of ref document: T Effective date: 20210315 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602018013072 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG9D |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20210224 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210524 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210624 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210525 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210524 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1364250 Country of ref document: AT Kind code of ref document: T Effective date: 20210224 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210624 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602018013072 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210409 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20210430 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210430 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20211103 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210430 Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 |
|
26N | No opposition filed |
Effective date: 20211125 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210409 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210624 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210430 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E Free format text: REGISTERED BETWEEN 20230209 AND 20230215 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20180409 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20230404 Year of fee payment: 6 Ref country code: FR Payment date: 20230424 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20230419 Year of fee payment: 6 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210224 |