US20040049972A1 - Method for producing adhesive polyacrylates using mercapto functional photoinitiators - Google Patents
Method for producing adhesive polyacrylates using mercapto functional photoinitiators Download PDFInfo
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- US20040049972A1 US20040049972A1 US10/343,523 US34352303A US2004049972A1 US 20040049972 A1 US20040049972 A1 US 20040049972A1 US 34352303 A US34352303 A US 34352303A US 2004049972 A1 US2004049972 A1 US 2004049972A1
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- United States
- Prior art keywords
- radicals
- groups
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- psa
- polymerization
- Prior art date
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- 239000000853 adhesive Substances 0.000 title claims abstract description 16
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 15
- 229920000058 polyacrylate Polymers 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 125000003396 thiol group Chemical class [H]S* 0.000 title 1
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 25
- -1 hydroxyalkylphenone Chemical compound 0.000 claims abstract description 18
- 239000000178 monomer Substances 0.000 claims abstract description 18
- 239000011541 reaction mixture Substances 0.000 claims abstract description 14
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 claims abstract description 6
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012965 benzophenone Substances 0.000 claims abstract description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 4
- 238000007342 radical addition reaction Methods 0.000 claims abstract description 4
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 claims abstract description 3
- 244000028419 Styrax benzoin Species 0.000 claims abstract description 3
- 235000000126 Styrax benzoin Nutrition 0.000 claims abstract description 3
- 235000008411 Sumatra benzointree Nutrition 0.000 claims abstract description 3
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 3
- 125000003277 amino group Chemical group 0.000 claims abstract description 3
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 claims abstract description 3
- 150000004056 anthraquinones Chemical class 0.000 claims abstract description 3
- WURBFLDFSFBTLW-UHFFFAOYSA-N benzil Chemical compound C=1C=CC=CC=1C(=O)C(=O)C1=CC=CC=C1 WURBFLDFSFBTLW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229960002130 benzoin Drugs 0.000 claims abstract description 3
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims abstract description 3
- BMFYCFSWWDXEPB-UHFFFAOYSA-N cyclohexyl(phenyl)methanone Chemical compound C=1C=CC=CC=1C(=O)C1CCCCC1 BMFYCFSWWDXEPB-UHFFFAOYSA-N 0.000 claims abstract description 3
- 235000019382 gum benzoic Nutrition 0.000 claims abstract description 3
- 125000005843 halogen group Chemical group 0.000 claims abstract description 3
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 20
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 13
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- 239000002390 adhesive tape Substances 0.000 claims description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 125000000524 functional group Chemical group 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 69
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 30
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 26
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 24
- 239000000047 product Substances 0.000 description 24
- 238000010992 reflux Methods 0.000 description 17
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 16
- 239000002904 solvent Substances 0.000 description 16
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000001035 drying Methods 0.000 description 14
- 229920000642 polymer Polymers 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000007787 solid Substances 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 238000010998 test method Methods 0.000 description 13
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 11
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 description 10
- 239000005020 polyethylene terephthalate Substances 0.000 description 10
- 238000005160 1H NMR spectroscopy Methods 0.000 description 9
- XBELKORJOVZQCZ-UHFFFAOYSA-N 4-benzoyl-n-(2-sulfanylethyl)benzamide Chemical compound C1=CC(C(=O)NCCS)=CC=C1C(=O)C1=CC=CC=C1 XBELKORJOVZQCZ-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000011521 glass Substances 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 230000035484 reaction time Effects 0.000 description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 description 7
- 235000011152 sodium sulphate Nutrition 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 6
- RFENWGBCFDTELK-UHFFFAOYSA-N 4-benzoyl-n-[5-[(4-benzoylbenzoyl)amino]-6-oxo-6-(2-sulfanylethylamino)hexyl]benzamide Chemical compound C=1C=C(C(=O)C=2C=CC=CC=2)C=CC=1C(=O)NC(C(=O)NCCS)CCCCNC(=O)C(C=C1)=CC=C1C(=O)C1=CC=CC=C1 RFENWGBCFDTELK-UHFFFAOYSA-N 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 5
- MZXWBWOJFFFQNH-UHFFFAOYSA-N [3-(4-benzoylbenzoyl)oxy-5-(2-sulfanylethylcarbamoyl)phenyl] 4-benzoylbenzoate Chemical compound C=1C(OC(=O)C=2C=CC(=CC=2)C(=O)C=2C=CC=CC=2)=CC(C(=O)NCCS)=CC=1OC(=O)C(C=C1)=CC=C1C(=O)C1=CC=CC=C1 MZXWBWOJFFFQNH-UHFFFAOYSA-N 0.000 description 5
- NOBYOEQUFMGXBP-UHFFFAOYSA-N (4-tert-butylcyclohexyl) (4-tert-butylcyclohexyl)oxycarbonyloxy carbonate Chemical compound C1CC(C(C)(C)C)CCC1OC(=O)OOC(=O)OC1CCC(C(C)(C)C)CC1 NOBYOEQUFMGXBP-UHFFFAOYSA-N 0.000 description 4
- 0 [1*]C(=C)C(=O)O[2*] Chemical compound [1*]C(=C)C(=O)O[2*] 0.000 description 4
- RYULULVJWLRDQH-UHFFFAOYSA-N [4-(bromomethyl)phenyl]-phenylmethanone Chemical compound C1=CC(CBr)=CC=C1C(=O)C1=CC=CC=C1 RYULULVJWLRDQH-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 150000008366 benzophenones Chemical class 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000012043 crude product Substances 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 239000012943 hotmelt Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- OGMADIBCHLQMIP-UHFFFAOYSA-N 2-aminoethanethiol;hydron;chloride Chemical compound Cl.NCCS OGMADIBCHLQMIP-UHFFFAOYSA-N 0.000 description 3
- OZCULFZQSHFJNI-UHFFFAOYSA-N 4-benzoylbenzoyl chloride Chemical compound C1=CC(C(=O)Cl)=CC=C1C(=O)C1=CC=CC=C1 OZCULFZQSHFJNI-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 3
- MSMAPCFQRXQMRL-UHFFFAOYSA-N (2-oxo-1,2-diphenylethyl) prop-2-enoate Chemical compound C=1C=CC=CC=1C(OC(=O)C=C)C(=O)C1=CC=CC=C1 MSMAPCFQRXQMRL-UHFFFAOYSA-N 0.000 description 2
- WXPWZZHELZEVPO-UHFFFAOYSA-N (4-methylphenyl)-phenylmethanone Chemical compound C1=CC(C)=CC=C1C(=O)C1=CC=CC=C1 WXPWZZHELZEVPO-UHFFFAOYSA-N 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 2
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- UYEMGAFJOZZIFP-UHFFFAOYSA-N 3,5-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC(O)=CC(O)=C1 UYEMGAFJOZZIFP-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 2
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical compound [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- YQBMZQPBSUBLKC-UHFFFAOYSA-N [3-(4-benzoylbenzoyl)oxy-5-carbonochloridoylphenyl] 4-benzoylbenzoate Chemical compound C=1C(OC(=O)C=2C=CC(=CC=2)C(=O)C=2C=CC=CC=2)=CC(C(=O)Cl)=CC=1OC(=O)C(C=C1)=CC=C1C(=O)C1=CC=CC=C1 YQBMZQPBSUBLKC-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 150000003926 acrylamides Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- QSZHIYSULZBTKW-UHFFFAOYSA-N methyl 3,5-bis[(4-benzoylbenzoyl)oxy]benzoate Chemical compound C=1C(OC(=O)C=2C=CC(=CC=2)C(=O)C=2C=CC=CC=2)=CC(C(=O)OC)=CC=1OC(=O)C(C=C1)=CC=C1C(=O)C1=CC=CC=C1 QSZHIYSULZBTKW-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- JXUDPCQVJSFZNT-UHFFFAOYSA-N phenyl-[4-(sulfanylmethyl)phenyl]methanone Chemical compound C1=CC(CS)=CC=C1C(=O)C1=CC=CC=C1 JXUDPCQVJSFZNT-UHFFFAOYSA-N 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- 239000001124 (E)-prop-1-ene-1,2,3-tricarboxylic acid Substances 0.000 description 1
- VEQCTDMBEVLHOF-UHFFFAOYSA-N 1-(2-benzoylphenyl)prop-2-en-1-one Chemical class C=CC(=O)C1=CC=CC=C1C(=O)C1=CC=CC=C1 VEQCTDMBEVLHOF-UHFFFAOYSA-N 0.000 description 1
- WMUBNWIGNSIRDH-UHFFFAOYSA-N 2,3,3-trichloroprop-2-enoic acid Chemical compound OC(=O)C(Cl)=C(Cl)Cl WMUBNWIGNSIRDH-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- GOVCZBPNOKTRKC-UHFFFAOYSA-N 3,5-bis[(4-benzoylbenzoyl)oxy]benzoic acid Chemical compound C=1C(OC(=O)C=2C=CC(=CC=2)C(=O)C=2C=CC=CC=2)=CC(C(=O)O)=CC=1OC(=O)C(C=C1)=CC=C1C(=O)C1=CC=CC=C1 GOVCZBPNOKTRKC-UHFFFAOYSA-N 0.000 description 1
- YYPNJNDODFVZLE-UHFFFAOYSA-N 3-methylbut-2-enoic acid Chemical compound CC(C)=CC(O)=O YYPNJNDODFVZLE-UHFFFAOYSA-N 0.000 description 1
- IFQUPKAISSPFTE-UHFFFAOYSA-N 4-benzoylbenzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1C(=O)C1=CC=CC=C1 IFQUPKAISSPFTE-UHFFFAOYSA-N 0.000 description 1
- SXIFAEWFOJETOA-UHFFFAOYSA-N 4-hydroxy-butyl Chemical group [CH2]CCCO SXIFAEWFOJETOA-UHFFFAOYSA-N 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N Benzoic acid Natural products OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- QPUXWAKDRUWGSD-UHFFFAOYSA-N C=C(C(ON)=O)N Chemical compound C=C(C(ON)=O)N QPUXWAKDRUWGSD-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical class Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 1
- BVHLGVCQOALMSV-JEDNCBNOSA-N L-lysine hydrochloride Chemical compound Cl.NCCCC[C@H](N)C(O)=O BVHLGVCQOALMSV-JEDNCBNOSA-N 0.000 description 1
- NQTADLQHYWFPDB-UHFFFAOYSA-N N-Hydroxysuccinimide Chemical compound ON1C(=O)CCC1=O NQTADLQHYWFPDB-UHFFFAOYSA-N 0.000 description 1
- 229920012485 Plasticized Polyvinyl chloride Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- NGAOFHGFNBPDCU-UHFFFAOYSA-N [2-(dibromomethyl)phenyl]-phenylmethanone Chemical compound BrC(Br)C1=CC=CC=C1C(=O)C1=CC=CC=C1 NGAOFHGFNBPDCU-UHFFFAOYSA-N 0.000 description 1
- UIDPPPSJGQSONY-UHFFFAOYSA-N [H]N(CCS)C(=O)c1cc(OCc2ccc(C(=O)c3ccccc3)cc2)cc(OCc2ccc(C(=O)c3ccccc3)cc2)c1 Chemical compound [H]N(CCS)C(=O)c1cc(OCc2ccc(C(=O)c3ccccc3)cc2)cc(OCc2ccc(C(=O)c3ccccc3)cc2)c1 UIDPPPSJGQSONY-UHFFFAOYSA-N 0.000 description 1
- 150000008062 acetophenones Chemical class 0.000 description 1
- 229940091181 aconitic acid Drugs 0.000 description 1
- 229920006222 acrylic ester polymer Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- WXBLLCUINBKULX-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1.OC(=O)C1=CC=CC=C1 WXBLLCUINBKULX-UHFFFAOYSA-N 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- PVEOYINWKBTPIZ-UHFFFAOYSA-N but-3-enoic acid Chemical compound OC(=O)CC=C PVEOYINWKBTPIZ-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- GTZCVFVGUGFEME-IWQZZHSRSA-N cis-aconitic acid Chemical compound OC(=O)C\C(C(O)=O)=C\C(O)=O GTZCVFVGUGFEME-IWQZZHSRSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000004440 column chromatography Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- LNGNZSMIUVQZOX-UHFFFAOYSA-L disodium;dioxido(sulfanylidene)-$l^{4}-sulfane Chemical compound [Na+].[Na+].[O-]S([O-])=S LNGNZSMIUVQZOX-UHFFFAOYSA-L 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002668 lysine derivatives Chemical class 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- VQGNBMWMQMFATM-UHFFFAOYSA-N phenyl-[2-(2-phenylethenyl)phenyl]methanone Chemical class C=1C=CC=C(C=CC=2C=CC=CC=2)C=1C(=O)C1=CC=CC=C1 VQGNBMWMQMFATM-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000011877 solvent mixture Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000446 sulfanediyl group Chemical class *S* 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 229920006250 telechelic polymer Polymers 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- CZDYPVPMEAXLPK-UHFFFAOYSA-N tetramethylsilane Chemical compound C[Si](C)(C)C CZDYPVPMEAXLPK-UHFFFAOYSA-N 0.000 description 1
- 238000004809 thin layer chromatography Methods 0.000 description 1
- GTZCVFVGUGFEME-UHFFFAOYSA-N trans-aconitic acid Natural products OC(=O)CC(C(O)=O)=CC(O)=O GTZCVFVGUGFEME-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
- C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
- C08F20/12—Esters of monohydric alcohols or phenols
Definitions
- the invention relates to a process for preparing pressure-sensitively adhesive polyacrylates by free-radical addition polymerization.
- PSAs Pressure sensitive adhesives
- the PSAs employed for these purposes must have certain properties, such as, for example, good surface tack, high cohesion, good tack at low and high temperatures, and good thermal load-bearing capacity.
- U.S. Pat. No. 4,144,157 describes UV-crosslinkable PSAs which have been synthesized, for example, from acrylic esters and from (meth)acrylic acid 2-alkoxy-2-phenyl-2-benzoylethyl esters. Disadvantageous again is the low reactivity of these photoinitiators and the associated low cohesion of the PSAs prepared.
- U.S. Pat. No. 4,737,559 discloses UV-crosslinkable acrylic PSAs containing copolymerizable (meth)acryloylbenzophenone derivatives in the polymer chain. These PSAs were specifically conceived for use in the medical sector, such as for plasters, for example.
- DE 38 44 445 A1 describes UV-crosslinkable PSAs based on (meth)acrylic ester polymers, which comprise a UV-reactive, copolymerized monomer in the form of an N-substituted (meth)acrylamide-benzophenone derivative; a (meth)acryloyloxy-benzophenone derivative or a styrene-benzophenone derivative.
- UV-crosslinkable PSAs based on isoamyl (meth)acrylate copolymers are described in DE 38 36 968 A1. These PSAs are based on ⁇ - ⁇ -monoolefinically unsaturated acids whose homopolymers possess a glass transition temperature of below ⁇ 30° C., on monoolefinically unsaturated acids and/or their anhydride, on further olefinically unsaturated monomers containing functional groups, and on a polymerizable (meth)acryloyloxybenzophenone or acetophenone derivative. Although the room temperature cohesion of the PSAs thus prepared; following brief UV irradiation, is acceptable, the thermal load-bearing capacity is inadequate.
- copolymerized photoinitiators fulfill only the function of UV crosslinking after coating. Accordingly it is necessary, for example, for preparing acrylic PSAs in acetone, to add regulators, so that the polymerization can be conducted with only a low solvent fraction and gelling of the polymer is avoided.
- the reduction in the solvent fraction is of great interest particularly for polyacrylate-based hotmelt PSAs, since in this case, following polymerization, the solvent has to be removed, which is laborious, and it would therefore be desirable to minimize the amounts used, on economic and environmental grounds.
- U.S. Pat. No. 5,942,555 used regulators likewise containing a photoinitiator to prepare telechelic polymers, and subsequently activated them with UV light.
- Sulfur compounds in PSAs are known from the field of the rubber adhesives. There, they serve as stabilizers; see in this respect DE 198 26 103 A1, which describes the use of solid monothiols, soluble or dispersible in rubber, as stabilizers in melted PSAs based on natural rubber or synthetic rubbers, suitable tackifier resins, and promoters for the purpose of increasing the radiation crosslinking yield.
- Polyfunctional (meth)acrylates can be added here as crosslinking promoters.
- Claim 1 relates accordingly to a process for preparing pressure-sensitively adhesive polyacrylates by free-radical addition polymerization, in which mercapto-functionalized photoinitiators of the general formula (I) and/or (II)
- R and R′ being chosen independently of one another from the following groups:
- radicals which comprise one or more of the substituted or unsubstituted radicals specified under a).
- the fraction of the compounds (I) and/or (II) is from 0.01 to 5% by weight, based on the monomers employed.
- the polymerization takes place using a monomer mixture which comprises at least the following component:
- R 2 an alkyl chain having 2-20 carbon atoms
- Examples of monomers from group a) are butyl, pentyl, hexyl, heptyl, octyl, isooctyl, 2-methylheptyl, 2-ethylhexyl, nonyl, decyl, dodecyl, lauryl or stearyl (meth)acrylate or (meth)acrylic acid.
- group b) examples include maleic anhydride, styrene, styrene compounds, vinyl acetate, (meth)acrylamides, N-substituted (meth)acrylamides, ⁇ -pacryloyloxypropionic acid, vinylacetic acid, fumaric acid, crotonic acid, aconitic acid, dimethylacrylic acid, trichloroacrylic acid, itaconic acid, vinyl acetate, hydroxyalkyl (meth)acrylate, amino-containing (meth)acrylates, hydroxyl-containing (meth)acrylates, with particular preference 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate and/or 4-hydroxybutyl (meth)acrylate, and double-bond-functionalized photoinitiators.
- composition of the corresponding monomers is preferably chosen such that the resultant adhesives possess pressure-sensitively adhesive properties in accordance with D. Satas [Handbook of Pressure Sensitive Adhesive Technology, 1989, VAN NOSTRAND REINHOLD, New York].
- the free radical polymerization can be carried out in the presence of one or more organic solvents and/or in the presence of water or without solvent. It is preferred to use as little solvent as possible. Depending on conversion and temperature, the polymerization time is between 6 and 48 h.
- solvents used include preferably esters of saturated carboxylic acids (such as ethyl acetate), aliphatic hydrocarbons (such as n-hexane or n-heptane), ketones (such as acetone or methyl ethyl ketone), special boiling point spirit or mixtures of these solvents.
- esters of saturated carboxylic acids such as ethyl acetate
- aliphatic hydrocarbons such as n-hexane or n-heptane
- ketones such as acetone or methyl ethyl ketone
- special boiling point spirit or mixtures of these solvents special boiling point spirit or mixtures of these solvents.
- stabilizers and emulsifiers which are familiar to the skilled worker for this purpose to the polymerization.
- Polymerization initiators used include customary radical-forming compounds such as peroxides, azo compounds, and peroxosulfates, for example. Initiator mixtures can also be used.
- polymerization regulators it is possible, for example to use alcohols and ethers.
- the polymerization may be carried out in polymerization reactors, which are generally provided with a stirrer, two or more feed vessels, reflux condenser, heating and cooling, and are equipped for operation under N 2 atmosphere and superatmospheric pressure.
- the polymerization medium can be rermoved under reduced pressure, this operation being carried out at elevated temperatures, for example, and advantageously in the range from 80 to 150° C.
- the polymers can then be used in solvent-free state, particularly as hotmelt PSAs. Depending on further processing and field of application it may also be of advantage to prepare the polymers of the invention without solvent.
- the polymers of the invention can be modified in customary fashion.
- tackifying resins such as terpene, terpenephenolic, C5, C9, C5/C9 hydrocarbon, pinene or indene resins or rosins, alone or in combination with one another.
- various fillers e.g., chalk, carbon black, glass microbeads, etc.
- aging inhibitors as additives.
- crosslinkers, and UV crosslinking promoters that are known to the skilled worker are admixed.
- Polyfunctional acrylate crosslinkers are particularly advantageous for the preparation of star polymers.
- the polymers are advantageously applied conventionally by brushing, spraying, rolling, knifecoating, pouring or extruding, where appropriate at elevated temperature—usually in the temperature range from 20 to 150° C.—to substrates suitable as carrier materials for this purpose: for example, to paper, paperboard, wood, metals, and polymer films, made for example from plasticized PVC; polyethylene, polyamides, polyethylene glycol terephthalate or polypropylene. Where solvents are used, they can easily be evaporated from the coatings, where appropriate at room temperature or slightly elevated temperatures, generally at temperatures of 20-150° C., preferably of 50-100° C., using, customarily, radiant heaters or heated-air circulation apparatus.
- the pressure-sensitively adhesive polyacrylates are crosslinked by ultraviolet radiation in a wavelength range from 200 to 400 nm.
- Crosslinking of the hotmelt PSAs of the invention takes place advantageously by brief UV irradiation with commercially customary high-pressure or medium-pressure mercury lamps having an output of, for example, from 80 to 160 W/cm. It may be appropriate to adapt the output of the lamp to the belt speed or, if the belt is running slowly, to shade off the belt partly in order to reduce the thermal load thereon.
- the irradiation time depends on the construction and output of the respective lamps.
- the invention relates, moreover, to the use of the pressure-sensitively adhesive polyacrylates prepared by the inventive process to produce PSA articles, particularly for producing an adhesive tape comprising an acrylic PSA applied to one or both sides of a backing.
- the UV-curing polyacrylates prepared by the inventive process are particularly suitable as melts or as solutions for preparing PSA materials having improved tack, improved bond strength, and high cohesion, such as PSA tapes, PSA sheets or PSA labels.
- films of polyethylene glycol terephthalate were coated with an adhesive application of 50 g/m 2 .
- dissolved polymers are used for adhesive performance testing
- the solvents are evaporated in a drying oven at 120° C. for 10 minutes.
- the dry PSA films were irradiated using an Eltosch unit with medium-pressure mercury lamps.
- the distance of the UV lamps from the irradiated PSA films was 5 cm, the output of the UV lamps is 120 W/cm.
- the product was diluted with 150 ml of chloroform, washed with 5 times 250 ml of 0.1 N hydrochloric acid, dried over sodium sulfate and finally recrystallized twice from 15:1 toluene/hexane. 12.9 g (65% yield) of the product were isolated.
- the different phases were separated with a centrifuge and the aqueous phase was extracted with three times 50 ml of chloroform.
- the combined organic phases were dried over sodium sulfate.
- the mother liquor was diluted with water and the precipitated product was filtered off, dissolved again in chloroform and then washed with 10% strength aqueous sodium hydrogen carbonate solution, 1 N hydrochloric acid and water. The product was used without further purification.
- a strip 20 mm wide of an acrylic PSA laminated onto a polyester film was applied to steel plates washed twice with acetone and once with isopropanol.
- the PSA strip was pressed onto the substrate twice using a 2 kg weight.
- the adhesive tape was then immediately peeled from the substrate at a speed of 300 mm/min and at an angle of 180°. All. measurements were conducted at room temperature under standardized climatic conditions.
- a strip of the adhesive tape 13 mm wide was applied to a smooth steel surface cleaned three times with acetone and once with isopropanol. The area of application was 20 mm ⁇ 13 mm (length ⁇ width). The adhesive tape was then pressed onto the steel substrate four times using a 2 kg weight. A 1 kg weight was fastened to the adhesive tape at room temperature and at 70° C.
- a conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 320 g of 2-ethylhexyl acrylate, 56 g of butyl acrylate, 20 g of acrylic acid, 200 g of acetone and 4 g of 4-mercaptomethylbenzophenone. After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C. with stirring and then 0.2 g of AIBN (azoisobutyronitrile) was added 0.2 g of AIBN was added after a reaction time of 1.5 h, and 100 g of acetone after 3 h.
- AIBN azoisobutyronitrile
- the PSA tape was dried in a drying oven at 120° C. for 10 minutes.
- the PSA specimen was subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254 nm) in 2 passes at 20 m/min.
- UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- a conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 320 g of 2-ethylhexyl acrylate, 56 g of butyl acrylate, 20 g of acrylic acid, 200 g of acetone and 4 9 of Ebecryl ⁇ P 36 (acrylated benzophenone derivative from UCB).
- the reaction mixture was heated to an internal temperature of 58° C. with stirring and then 0.2 g of AIBN (azoisobutyronitrile) was added.
- AIBN azoisobutyronitrile
- 0.2 g of AIBN was added after a reaction time of 1.5 h, 100 g of acetone after 3 h.
- 0.2 g of Perkadox ⁇ 16 bis(4-tert-butylcyclohexanyl) peroxydicarbonate
- a conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 320 g of 2-ethylhexyl acrylate, 56 g of butyl acrylate, 20 g of acrylic acid, 200 g of acetone/isopropanol (97:3) and 4 g of Ebecryl ⁇ P 36 (acrylated benzophenone derivative from UCB). After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C with stirring and then 0.2 g of AIBN (azoisobutyronitrile) was added.
- AIBN azoisobutyronitrile
- 0.2 9 of AIBN was added after a reaction time of 1.5 h, and 100 g of acetone/isopropanol (97:3) after 3 h. After 8 and 10 hours of reaction, in each case 0.2 g of Perkadox ⁇ 16 (bis(4-tert-butylcyclohexanyl) peroxydicarbonate) was added, and after 10 h a further 100 g of acetone/isopropanol (97:3) were added for dilution. The polymerization was terminated after 24 h by cooling. The product was a polymer having a molecular weight of 760 000 g/mol (M w from gel permeation chromatography).
- the PSA thus prepared was diluted down to 35% (solids) with acetone and then applied at 50 g/m 2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 ⁇ m thick.
- the PSA tape was dried in a drying oven at 120° C. for 10 minutes.
- the PSA specimen was subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254 nm) in 2 passes at 20 m/min.
- UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- a conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 360 g of 2-ethylhexyl acrylate, 34 g of acrylic acid, 200 g of acetone and 6 g of N-(2-mercaptoethyl)-4-benzoylbenzamide. After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C. with stirring, and subsequently the procedure of example 7 was followed.
- the product is a polymer having a molecular weight of 710 000 g/mol (M w from gel permeation chromatography).
- the PSA thus prepared was diluted down to 35% (solids) with acetone and then applied at 50 g/m 2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 ⁇ m thick.
- the PSA tape was dried in a drying oven at 120° C. for 10 minutes.
- the PSA specimen was subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254,nm) in 2 passes at 20 m/min.
- UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- a conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 360 g of 2-ethylhexyl acrylate, 34 g of acrylic acid, 200 g of acetone and 6 g of benzoin acrylate (prepared by the method of Guse et al. in accordance with DE 27 43 979 A1).
- the reaction mixture was heated to an internal temperature of 58° C. with stirring and then 0.2 g of AIBN (azoisobutyronitrile) was added 0.2 g of AIBN was added after a reaction time of 1.5 h, 100 g of acetone after 3 h.
- 0.2 g of Perkadox ⁇ 16 bis(4-tert-butylcyclohexanyl) peroxydicarbonate
- a conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 360 g of 2-ethylhexyl acrylate, 34 g of acrylic acid, 200 g of acetone/isopropanol (97:3) and 6 g of benzoin acrylate (prepared by the method of Guse et al. in accordance with DE 27 43 979 A1). After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C. with stirring, and subsequently the procedure of example 7 was followed. The product was a polymer having a molecular weight of 750,000 g/mol (M w from gel permeation chromatography).
- the PSA thus prepared was diluted down to 35% (solids) with acetone. and then applied at 50 g/m 2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 ⁇ m thick.
- the PSA tape was dried in a drying oven at 120° C. for 10 minutes.
- the PSA specimen was subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254 nm) in 2 passes at 20 m/min.
- UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- the mercapto-functionalized photo-initiator is very suitable for preparing acrylic PSAs by the inventive process. There is no need to supply any regulator to the polymerization (examples 7+10).
- Comparison with examples 9 and 12 shows that acrylated photoinitiators can be copolymerized by the addition of a regulator.
- the polymers prepared by the process of the invention were diluted down to 35% (solids) with acetone and then applied at 50 g/m 2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 ⁇ m thick.
- the PSA tapes were dried in a drying oven at 120° C. for 10 minutes.
- the PSA specimens were subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254 nm),in 2 passes at 20 m/min.
- UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
Abstract
A process for preparing pressure-sensitively adhesive polyacrylates by free-radical addition polymerization, characterized in that mercapto-functionalized photoinitiators of the general formula (I) and/or (II).
H—S—R (I)
R—S—S—R′ (II)
are added to the monomer mixture or to the reaction mixture, R and R′ being chosen independently of one another from the following groups:
a) benzophenone, acetophenone, benzil, benzoin, hydroxyalkylphenone, phenylcyclohexyl ketone, anthraquinone, thioxanthone, triazine, or fluorenone radicals, it being possible for each of these radicals to be substituted by one or more halogen atoms and/or one or more alkoxy groups and/or one or more amino groups or hydroxyl groups,
b) radicals which comprise one or more of the substituted or unsubstituted radicals specified under a).
Description
- The invention relates to a process for preparing pressure-sensitively adhesive polyacrylates by free-radical addition polymerization.
- Pressure sensitive adhesives (PSAs) are increasingly being employed to produce PSA tapes, self-adhesive labels, adhering protective films or other self-adhesive products. The PSAs employed for these purposes must have certain properties, such as, for example, good surface tack, high cohesion, good tack at low and high temperatures, and good thermal load-bearing capacity.
- DE 24 11 169 A1 describes UV-crosslinkable PSAs for which copolymers of (meth)acrylic esters, and, monoolefinically unsaturated ethers and (meth)acrylic ester derivatives of substituted benzophenone are used as copolymerized photoinitiators. The UV reactivity of the polymerizable benzophenones, however, is low, and after UV crosslinking the shear strength of the PSAs prepared from the polymers is too low.
- U.S. Pat. No. 4,144,157 describes UV-crosslinkable PSAs which have been synthesized, for example, from acrylic esters and from (meth)acrylic acid 2-alkoxy-2-phenyl-2-benzoylethyl esters. Disadvantageous again is the low reactivity of these photoinitiators and the associated low cohesion of the PSAs prepared.
- U.S. Pat. No. 4,737,559 discloses UV-crosslinkable acrylic PSAs containing copolymerizable (meth)acryloylbenzophenone derivatives in the polymer chain. These PSAs were specifically conceived for use in the medical sector, such as for plasters, for example.
- The PSAs prepared in accordance with said patent application require a relatively long irradiation time, as a result of which bond strength and tack are adversely affected.
- DE 38 44 445 A1 describes UV-crosslinkable PSAs based on (meth)acrylic ester polymers, which comprise a UV-reactive, copolymerized monomer in the form of an N-substituted (meth)acrylamide-benzophenone derivative; a (meth)acryloyloxy-benzophenone derivative or a styrene-benzophenone derivative.
- UV-crosslinkable PSAs based on isoamyl (meth)acrylate copolymers are described in DE 38 36 968 A1. These PSAs are based on α-β-monoolefinically unsaturated acids whose homopolymers possess a glass transition temperature of below −30° C., on monoolefinically unsaturated acids and/or their anhydride, on further olefinically unsaturated monomers containing functional groups, and on a polymerizable (meth)acryloyloxybenzophenone or acetophenone derivative. Although the room temperature cohesion of the PSAs thus prepared; following brief UV irradiation, is acceptable, the thermal load-bearing capacity is inadequate.
- The thermal load-bearing capacity was solved in DE 195 01 024 A1 through the use of a copolymerizable photoinitiator based on a diester of carbonic acid.
- All of the methods set out and described above, however, have a key disadvantage. The copolymerized photoinitiators fulfill only the function of UV crosslinking after coating. Accordingly it is necessary, for example, for preparing acrylic PSAs in acetone, to add regulators, so that the polymerization can be conducted with only a low solvent fraction and gelling of the polymer is avoided. The reduction in the solvent fraction is of great interest particularly for polyacrylate-based hotmelt PSAs, since in this case, following polymerization, the solvent has to be removed, which is laborious, and it would therefore be desirable to minimize the amounts used, on economic and environmental grounds.
- U.S. Pat. No. 5,942,555 used regulators likewise containing a photoinitiator to prepare telechelic polymers, and subsequently activated them with UV light.
- Sulfur compounds in PSAs are known from the field of the rubber adhesives. There, they serve as stabilizers; see in this respect DE 198 26 103 A1, which describes the use of solid monothiols, soluble or dispersible in rubber, as stabilizers in melted PSAs based on natural rubber or synthetic rubbers, suitable tackifier resins, and promoters for the purpose of increasing the radiation crosslinking yield. Polyfunctional (meth)acrylates can be added here as crosslinking promoters.
- It is an object of the present invention to provide a process for preparing UV-crosslinkable acrylic pressure sensitive adhesives, especially UV-crosslinkable acrylic hotmelt pressure sensitive adhesives, with the acrylic PSAs thus prepared no longer having the disadvantages mentioned of the prior art.
- This object is achieved by means of a process as set out in the main claim. The subclaims relate to advantageous developments and embodiments of this process and also to the use of the adhesives thus prepared for producing PSA articles.
- Claim 1 relates accordingly to a process for preparing pressure-sensitively adhesive polyacrylates by free-radical addition polymerization, in which mercapto-functionalized photoinitiators of the general formula (I) and/or (II)
- H—S—R (I)
- R—S—S—R (II)
- are added to the monomer mixture or to the reaction mixture, R and R′ being chosen independently of one another from the following groups:
- a) benzophenone, acetophenone, benzil, benzoin, hydroxyalkylphenone, phenylcyclohexyl ketone, anthraquinone, thioxanthone,.triazine, or fluorenone radicals, it being possible for each of these radicals to be substituted by one or more halogen atoms and/or one or more alkoxy groups and/or one or more amino groups or hydroxyl groups,
- b) radicals which comprise one or more of the substituted or unsubstituted radicals specified under a).
- In a first advantageous development of this process the fraction of the compounds (I) and/or (II) is from 0.01 to 5% by weight, based on the monomers employed.
- In a further embodiment of the process, which is very favorable in the inventive sense, the polymerization takes place using a monomer mixture which comprises at least the following component:
-
- where R1═H or CH3
- and R2=an alkyl chain having 2-20 carbon atoms
- with a fraction of from 65 to 100% by weight,
- and which optionally comprises the following component:
- b) vinyl compounds having functional groups
- with a fraction of from 0 to 35% by weight,
- it being possible optionally for further components to be present in the monomer mixture.
- Examples of monomers from group a) are butyl, pentyl, hexyl, heptyl, octyl, isooctyl, 2-methylheptyl, 2-ethylhexyl, nonyl, decyl, dodecyl, lauryl or stearyl (meth)acrylate or (meth)acrylic acid. Examples that may be mentioned of group b) include maleic anhydride, styrene, styrene compounds, vinyl acetate, (meth)acrylamides, N-substituted (meth)acrylamides, β-pacryloyloxypropionic acid, vinylacetic acid, fumaric acid, crotonic acid, aconitic acid, dimethylacrylic acid, trichloroacrylic acid, itaconic acid, vinyl acetate, hydroxyalkyl (meth)acrylate, amino-containing (meth)acrylates, hydroxyl-containing (meth)acrylates, with particular preference 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate and/or 4-hydroxybutyl (meth)acrylate, and double-bond-functionalized photoinitiators.
- The composition of the corresponding monomers is preferably chosen such that the resultant adhesives possess pressure-sensitively adhesive properties in accordance with D. Satas [Handbook of Pressure Sensitive Adhesive Technology, 1989, VAN NOSTRAND REINHOLD, New York].
- The free radical polymerization can be carried out in the presence of one or more organic solvents and/or in the presence of water or without solvent. It is preferred to use as little solvent as possible. Depending on conversion and temperature, the polymerization time is between 6 and 48 h.
- In the case of solution polymerization, solvents used include preferably esters of saturated carboxylic acids (such as ethyl acetate), aliphatic hydrocarbons (such as n-hexane or n-heptane), ketones (such as acetone or methyl ethyl ketone), special boiling point spirit or mixtures of these solvents. For polymerization in aqueous media or in mixtures of organic and aqueous solvents, it is preferred to add stabilizers and emulsifiers which are familiar to the skilled worker for this purpose to the polymerization. Polymerization initiators used include customary radical-forming compounds such as peroxides, azo compounds, and peroxosulfates, for example. Initiator mixtures can also be used.
- In the polymerization, in addition to the thio compounds modified with a UV photoinitiator, it is also possible to use further regulators for lowering the molecular weight and reducing the polydispersity. As so-called polymerization regulators it is possible, for example to use alcohols and ethers.
- The polymerization may be carried out in polymerization reactors, which are generally provided with a stirrer, two or more feed vessels, reflux condenser, heating and cooling, and are equipped for operation under N2 atmosphere and superatmospheric pressure.
- Following polymerization in solvent, the polymerization medium can be rermoved under reduced pressure, this operation being carried out at elevated temperatures, for example, and advantageously in the range from 80 to 150° C. The polymers can then be used in solvent-free state, particularly as hotmelt PSAs. Depending on further processing and field of application it may also be of advantage to prepare the polymers of the invention without solvent.
- To prepare the acrylic PSAs, the polymers of the invention can be modified in customary fashion. Added favorably, for example, are tackifying resins, such as terpene, terpenephenolic, C5, C9, C5/C9 hydrocarbon, pinene or indene resins or rosins, alone or in combination with one another. Depending on application it is further of advantage to admix plasticizers, various fillers (e.g., chalk, carbon black, glass microbeads, etc.) and aging inhibitors as additives. Optionally, furthermore, crosslinkers, and UV crosslinking promoters that are known to the skilled worker are admixed. Polyfunctional acrylate crosslinkers are particularly advantageous for the preparation of star polymers.
- The polymers are advantageously applied conventionally by brushing, spraying, rolling, knifecoating, pouring or extruding, where appropriate at elevated temperature—usually in the temperature range from 20 to 150° C.—to substrates suitable as carrier materials for this purpose: for example, to paper, paperboard, wood, metals, and polymer films, made for example from plasticized PVC; polyethylene, polyamides, polyethylene glycol terephthalate or polypropylene. Where solvents are used, they can easily be evaporated from the coatings, where appropriate at room temperature or slightly elevated temperatures, generally at temperatures of 20-150° C., preferably of 50-100° C., using, customarily, radiant heaters or heated-air circulation apparatus.
- In a way which is also very advantageous for the inventive process, the pressure-sensitively adhesive polyacrylates are crosslinked by ultraviolet radiation in a wavelength range from 200 to 400 nm. Crosslinking of the hotmelt PSAs of the invention takes place advantageously by brief UV irradiation with commercially customary high-pressure or medium-pressure mercury lamps having an output of, for example, from 80 to 160 W/cm. It may be appropriate to adapt the output of the lamp to the belt speed or, if the belt is running slowly, to shade off the belt partly in order to reduce the thermal load thereon. The irradiation time depends on the construction and output of the respective lamps.
- The invention relates, moreover, to the use of the pressure-sensitively adhesive polyacrylates prepared by the inventive process to produce PSA articles, particularly for producing an adhesive tape comprising an acrylic PSA applied to one or both sides of a backing.
- The UV-curing polyacrylates prepared by the inventive process are particularly suitable as melts or as solutions for preparing PSA materials having improved tack, improved bond strength, and high cohesion, such as PSA tapes, PSA sheets or PSA labels.
- The PSA properties of the polyacrylates prepared by the inventive process, following UV irradiation, are determined by the test methods described below.
- For the test, films of polyethylene glycol terephthalate were coated with an adhesive application of 50 g/m2.
- Where dissolved polymers are used for adhesive performance testing, the solvents are evaporated in a drying oven at 120° C. for 10 minutes. The dry PSA films were irradiated using an Eltosch unit with medium-pressure mercury lamps. The distance of the UV lamps from the irradiated PSA films was 5 cm, the output of the UV lamps is 120 W/cm.
- The invention is illustrated below by examples. Amounts, proportions, and percentages are based on the total amount of the monomers.
- Preparation of the UV-Activatable Thior Gulators
-
- Preparation of 4-benzoylbenzoyl chloride
- 1.0 kg (4.2 mol) of 4-benzoylbenzoic acid were filled into a 5 L reactor, equipped with a reflux condenser and a stirrer, and additionally 645 ml (8.84 mol) of thionyl chloride and 725 ml of toluene were added. Then 3.5 ml of DMF were added and the mixture was boiled under reflux for 4 h. After cooling, the solvent was removed under reduced pressure and excess thionyl chloride was removed by evaporating three times with 500 ml of toluene each time. The product was recrystallized from a 1:4 toluene/hexane mixture and recovered with 934 g (86% yield) after-drying in a vacuum oven.
-
- Preparation of 4-bromomethylbenzophenone
- 750 g (3.82 mol) of 4-methylbenzophenone were filled into a 5 L reactor, equipped with a reflux condenser and a stirrer, and additionally 2850 ml of benzene were added. The mixture was heated to reflux and 610 g (3.82 mol) of bromine in solution in 330 ml of benzene were added dropwise. The rate of addition was approximately 1.5 ml/min. The reactor was irradiated with a halogen lamp at 100 W to initiate the reaction, thereafter with different cycles of identical output.
- In each of the cycles, the irradiation was carried out in alternation for a period of 5 s, followed by a period of 40 s without irradiation. After 1 h, this cycle was altered to a sequence of 10 s irradiation and 40 s without irradiation. After the end of the reaction (decoloration of the dark brown solution by consumptive reaction with bromine) the crude product was analyzed by means of GC. A mixture of monobromo and dibromomethyl-benzophenone and unreacted 4-methylbenzophenone was found. The reaction mixture was washed with 10 g of sodium thiosulfite in 100 g of water and 3 times with 200 g of water each time. The product was subsequently dried over sodium sulfate and recrystallized twice from 1:3 toluene/hexane. After drying under reduced pressure, 590 g of 4-bromomethylbenzophenone (56% yield) were isolated.
-
- Preparation of 4-mercaptomethylbenzophenone (I)
- 4.14 g (54.4 mmol) of thiourea were dissolved in 31.5 ml of ethanol (95%), 15.0 g (54.4 mmol) of 4-bromomethylbenzophenone were added with gentle heating and stirring, and the mixture was stirred overnight at room temperature. The solid product was isolated by filtration and washed several times with ethanol. After drying in a vacuum oven, 15.6 g were isolated (82% yield). No further purification was carried out.
- 12.5 g (35.5 mmol) of this hydrobromide salt were dissolved in 250 ml of water with heating and then 5.7 g of sodium hydroxide (0.143 mol) in solution in 10 ml of water were added. After 45 minutes of refluxing the solution was cooled to room temperature, a pH of less than 2 was set using concentrated sulfuric acid, and the product was extracted 5 times with 60 ml of chloroform. The combined extracts were washed with 100 ml of water and dried over sodium sulfate. After the solvent had been removed, 7.9 g (97%) were isolated.
- The melting point was 54° C.1H-NMR at 300 MHz (CDCl3) gave [ppm]: 7.14-7.78 (m, 9 H), 3.70 (d, 2H) and 1.77 (t, 1 H). The signals were consistent with the desired product.
- Preparation of N-(2-mercaptoethyl)-4-benzoylbenzamide (II)
- 24.39 g (0.215 mol) of 2-aminoethanethiol hydrochloride in solution in 200 ml of chloroform were placed under argon in a 1 L three-necked flask. A solution of 50 g (0.204 mol) of 4-benzoylbenzoyl chloride and 250 ml of chloroform was subsequently added dropwise over a period of 45 minutes. The mixture was stirred at room temperature overnight. It was then washed with water and a 0.1 N HCl solution and dried over sodium sulfate. After the drying operation, twofold recrystallization from toluene gave 50 g of a white powder (86% yield).
- The melting point was 112° C.1H-NMR at 300 MHz (CDCl3) gave [ppm]: 7.18-7.82 (m, 9 H), 6.70-7.02 (m, 1H), 3.52 (q, 2H), 2.54-2.97 (m, 2H) and 1.37 (t, 1H). The signals were consistent with the desired product.
- Preparation of N-(2-mercaptoethyl)-3,5-bis(4-benzoylbenzoyloxy)benzamide (III)
- 46.2 g (0.30 mol) of 3,5-dihydroxybenzoic acid were introduced into a 250 ml flask with Soxlett extractor and reflux condenser. 48.6 ml of methanol and 0.8 ml of sulfuric acid were added and 50 g of molecular sieve (3Å) were placed in the Soxlett extractor. The extractor was filled with methanol and the entire mixture was refluxed overnight. The methylated crude product was subsequently isolated after removal of the solvent.
- The entire product was placed in a 2 L reactor with reflux condenser and stirrer, and then 173.25 g (0.63 mol) of 4-bromomethylbenzophenone, 207 g (1.50 mol) of potassium carbonate and 1200 ml of acetone were added. During overnight reflux, the reaction was monitored by thin-layer chromatography. Following complete conversion the solid was isolated by filtration and acetone was removed under reduced pressure. The solid was dissolved in 1 L of water and then extracted with three times 1 L of chloroform. The extracts were combined with the acetone-soluble fraction and dried over sodium sulfate, and 177 g of the crude product were isolated. The crude product was recrystallized twice from acetonitrile, to give ultimately 145 g (87%).
- The melting point was 130° C.1H-NMR at 300 MHz (CDCl3) gave [ppm]: 7.22-7.78 (m, 18 H), 7.15 (d, 2H), 6.69 (t, 1H), 5.02 (s, 4H) and 3.84 (s, 3H). The signals were consistent with the desired product: methyl 3,5-bis(4-benzoylbenzoyloxy)benzoate.
- 60.1 g (0.108 mol) of methyl 3,5-bis(4-benzoylbenzoyloxy)benzoate were introduced into a 2 L reactor and 120 ml of water, 480 ml of methanol and 6.48 g (0.162 mol) of sodium hydroxide were added. The reaction mixture was refluxed for 3 h. After hydrolysis of the ester, the mixture was cooled and methanol was removed under reduced pressure. The sodium salt which remained was dissolved in 2 400 ml of hot water and the free acid was subsequently precipitated using hydrochloric acid. Filtration, washing with water, and vacuum oven drying gave 54 g of a white powder (92%).
- The melting point was 188° C. The melting point was 130° C.1H-NMR at 300 MHz (CDCl3) gave [ppm]: 7.28-7.78 (m, 18 H), 7.15 (d, 2H), 5.86 (t, 1H) and 5.16 (s, 4H). The signals were consistent with the desired product: 3,5-bis(4-benzoylbenzoyloxy)benzoic acid.
- 20 g (36.86 mmol) of 3,5-7bis(4-benzoylbenzoyloxy)benzoic acid were introduced together with 36 ml of toluene, 5.4 ml (74.0 mmol) of thionyl chloride and 28 μl of N,N-dimethylformamide into a 250 ml flask. The mixture was refluxed for 4 h. After the acid chloride had formed the mixture was cooled to room temperature, the solvent and excess thionyl chloride were removed under reduced pressure, and purification was continued by evaporating a further 4 times with 20 ml of chloroform each time. Recrystallization from toluene gave 18.5 g of the product (89% yield).
- The melting point was 125° C.1H-NMR at 300 MHz (CDCl3) gave [ppm]: 7.29-7.78 (m, 18 H), 7.20 (d, 2H), 6.79 (t, 1H), 5.08 (s, 4H). The signals were consistent with the desired product: 3,5-bis(4-benzoylbenzoyloxy)benzoyl chloride.
- 4.19 g (36.7 mmol) of 2-aminoethanethiol hydrochloride were introduced into a 250 ml flask with reflux condenser and stirrer and then 15 ml of chloroform and 10.64 ml (76.5 mmol) of triethylamine were added. The reaction mixture was cooled to 0° C. using an ice bath and then 18.4 g (32.8 mmol) of 3,5-bis(4-benzoylbenzoyloxy)benzoyl chloride in solution in 50 ml of chloroform were added dropwise over a period of 50 minutes. After a further 30 minutes of ice cooling, the mixture was warmed to room temperature for 2 h. The product was diluted with 150 ml of chloroform, washed with 5 times 250 ml of 0.1 N hydrochloric acid, dried over sodium sulfate and finally recrystallized twice from 15:1 toluene/hexane. 12.9 g (65% yield) of the product were isolated.
- The melting point was 114° C.1H-NMR at 300 MHz (DMSO-d6) gave [ppm]: 7.20-7.80 (m, 18 H), 7.00 (d, 2H), 6.66 (t, 1H), 6.52 (broad t, 1H), 5.08 (s, 4H), 3.50 (q, 2H), 2.74 (q, 2H) and 1.40 (t, 1 H). The signals were consistent with the desired product: N-(2-mercaptoethyl)-3,5-bis(4-benzoylbenzoyloxy)benzamide. (III).
- Preparation of N-(2-mercaptoethyl)-2,6-bis(4-benzoylbenzamido)hexanamide (IV)
- 3.65 g (20 mmol) of lysine monohydrochloride were dissolved in 8 ml of 2 N aqueous sodium hydroxide solution and the solution was cooled using an ice bath. A solution of 10.77 g (44 mmol) of 4-benzoylbenzoyl chloride in 17 ml of chloroform was added simultaneously with 4.48. of sodium hydroxide in 19 ml of water. The reaction mixture was stirred for 2 h with ice cooling and then for 3 h at room temperature. Hydrochloric acid was used to set a pH of less than 1, and then 60 ml of chloroform were added. The different phases were separated with a centrifuge and the aqueous phase was extracted with three times 50 ml of chloroform. The combined organic phases were dried over sodium sulfate. The mother liquor was diluted with water and the precipitated product was filtered off, dissolved again in chloroform and then washed with 10% strength aqueous sodium hydrogen carbonate solution, 1 N hydrochloric acid and water. The product was used without further purification.
- 4.35 g (7.73 mmol) of the lysine derivative and 0.901 g (7.83 mmol) of N-hydroxy-succinimide were dissolved in 40 ml of 1,4-dioxane, and then 1.951 g (9.45 mmol) of 1,3-dycyclohexylcarbodiimide (DCC) in 10 ml of 1,4-dioxane were added. The ester was filtered off and dried (4.1 g, 81% yield). In a separate flask, 0.75 g (6.6 mmol) of 2-aminoethanethiol hydrochloride were dissolved in 15 ml of chloroform. 4.1 g (6.22 mmol) of the ester, following dissolution in 25 ml of chloroform, are added slowly dropwise to this solution at room temperature over a period of 30 minutes. After 4 h the reaction mixture was washed with water and 0.05 N hydrochloric acid, dried over sodium sulfate and then purified by column chromatography using a solvent mixture of 95% chloroform and 5% methanol. 2.2.g (yield 56%) of the product were isolated.
-
- Polymerizations
- 180° Bond Strength Test (Test Method A)
- A strip 20 mm wide of an acrylic PSA laminated onto a polyester film was applied to steel plates washed twice with acetone and once with isopropanol. The PSA strip was pressed onto the substrate twice using a 2 kg weight. The adhesive tape was then immediately peeled from the substrate at a speed of 300 mm/min and at an angle of 180°. All. measurements were conducted at room temperature under standardized climatic conditions.
- The measurement results are reported in N/cm and are averaged from three measurements.
- Shear Strength (Test Method B)
- A strip of the adhesive tape 13 mm wide was applied to a smooth steel surface cleaned three times with acetone and once with isopropanol. The area of application was 20 mm×13 mm (length×width). The adhesive tape was then pressed onto the steel substrate four times using a 2 kg weight. A 1 kg weight was fastened to the adhesive tape at room temperature and at 70° C.
- The shear stability times measured are reported in minutes and correspond to the average of three measurements.
- A conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 320 g of 2-ethylhexyl acrylate, 56 g of butyl acrylate, 20 g of acrylic acid, 200 g of acetone and 4 g of 4-mercaptomethylbenzophenone. After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C. with stirring and then 0.2 g of AIBN (azoisobutyronitrile) was added 0.2 g of AIBN was added after a reaction time of 1.5 h, and 100 g of acetone after 3 h. After 8 and 10 hours of reaction, in each case 0.2 g of Perkadox© 16 (bis(4-tert-butylcyclohexanyl) peroxydicarbonate) was added, and after 10 h a further 100 g of acetone were added for dilution. The polymerization was terminated after 24 h by cooling. The product was a polymer having a molecular weight of 740 000 g/mol (Mw from gel permeation chromatography). The PSA thus prepared was diluted down to 35% (solids) with acetone and then applied at 50 g/m2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 μm thick. The PSA tape was dried in a drying oven at 120° C. for 10 minutes. The PSA specimen was subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254 nm) in 2 passes at 20 m/min.
- The UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- The results are compiled in table 2.
TABLE 2 SST, RT, 10 N SST, 70° C., 10 N BS steel [N/cm] [min] [min] Example 7 6.1 7 840 1 355 - A conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 320 g of 2-ethylhexyl acrylate, 56 g of butyl acrylate, 20 g of acrylic acid, 200 g of acetone and 4 9 of Ebecryl© P 36 (acrylated benzophenone derivative from UCB). After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C. with stirring and then 0.2 g of AIBN (azoisobutyronitrile) was added. 0.2 g of AIBN was added after a reaction time of 1.5 h, 100 g of acetone after 3 h. After a reaction time of 8 h, 0.2 g of Perkadox© 16 (bis(4-tert-butylcyclohexanyl) peroxydicarbonate) was added.
- After 9 h, the polymerization had to be terminated, since the batch had completely gelled.
- A conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 320 g of 2-ethylhexyl acrylate, 56 g of butyl acrylate, 20 g of acrylic acid, 200 g of acetone/isopropanol (97:3) and 4 g of Ebecryl© P 36 (acrylated benzophenone derivative from UCB). After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C with stirring and then 0.2 g of AIBN (azoisobutyronitrile) was added. 0.2 9 of AIBN was added after a reaction time of 1.5 h, and 100 g of acetone/isopropanol (97:3) after 3 h. After 8 and 10 hours of reaction, in each case 0.2 g of Perkadox© 16 (bis(4-tert-butylcyclohexanyl) peroxydicarbonate) was added, and after 10 h a further 100 g of acetone/isopropanol (97:3) were added for dilution. The polymerization was terminated after 24 h by cooling. The product was a polymer having a molecular weight of 760 000 g/mol (Mw from gel permeation chromatography). The PSA thus prepared was diluted down to 35% (solids) with acetone and then applied at 50 g/m2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 μm thick. The PSA tape was dried in a drying oven at 120° C. for 10 minutes. The PSA specimen was subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254 nm) in 2 passes at 20 m/min.
- The UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- The results are compiled in table 3.
TABLE 3 SST, RT, 10 N SST, 70° C., 10 N BS steel [N/cm] [min] [min] Example 10 5.8 6 350 560 - A conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 360 g of 2-ethylhexyl acrylate, 34 g of acrylic acid, 200 g of acetone and 6 g of N-(2-mercaptoethyl)-4-benzoylbenzamide. After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C. with stirring, and subsequently the procedure of example 7 was followed. The product is a polymer having a molecular weight of 710 000 g/mol (Mw from gel permeation chromatography). The PSA thus prepared was diluted down to 35% (solids) with acetone and then applied at 50 g/m2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 μm thick. The PSA tape was dried in a drying oven at 120° C. for 10 minutes. The PSA specimen was subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254,nm) in 2 passes at 20 m/min.
- The UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- The results are compiled in table 4.
TABLE 4 SST, RT, 10 N SST, 70° C., 10 N BS steel [N/cm] [min] [min] Example 10 5.2 +10 000 7 525 - A conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 360 g of 2-ethylhexyl acrylate, 34 g of acrylic acid, 200 g of acetone and 6 g of benzoin acrylate (prepared by the method of Guse et al. in accordance with DE 27 43 979 A1). After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C. with stirring and then 0.2 g of AIBN (azoisobutyronitrile) was added 0.2 g of AIBN was added after a reaction time of 1.5 h, 100 g of acetone after 3 h. After a reaction time of 8 h, 0.2 g of Perkadox© 16 (bis(4-tert-butylcyclohexanyl) peroxydicarbonate) was added.
- After 9 h, the polymerization had to be terminated, since the batch had completely gelled.
- A conventional 2 L glass reactor equipped with a mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath was charged with 360 g of 2-ethylhexyl acrylate, 34 g of acrylic acid, 200 g of acetone/isopropanol (97:3) and 6 g of benzoin acrylate (prepared by the method of Guse et al. in accordance with DE 27 43 979 A1). After 30 minutes of nitrogen gas inertization, the reaction mixture was heated to an internal temperature of 58° C. with stirring, and subsequently the procedure of example 7 was followed. The product was a polymer having a molecular weight of 750,000 g/mol (Mw from gel permeation chromatography). The PSA thus prepared was diluted down to 35% (solids) with acetone. and then applied at 50 g/m2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 μm thick. The PSA tape was dried in a drying oven at 120° C. for 10 minutes. The PSA specimen was subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254 nm) in 2 passes at 20 m/min.
- The UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- The results are compiled in table 5.
TABLE 5 SST, RT, 10N SST, 70° C., 10 N BS steel [N/cm] [min] [min] Example 9 5.3 +10 000 2 455 - As apparent from the described examples 7 to 12, the mercapto-functionalized photo-initiator is very suitable for preparing acrylic PSAs by the inventive process. There is no need to supply any regulator to the polymerization (examples 7+10). The polymerizations conducted analogously (examples 8 and 11) gelled. Comparison with examples 9 and 12 shows that acrylated photoinitiators can be copolymerized by the addition of a regulator. Comparison of tables 2 and 3 and 4 and 5, respectively, indicates a significantly poorer thermal shear stability for this method, however.
- The polymerization of the following monomer mixtures (table 6: composition of the monomer mixtures used; amounts in % by weight) was conducted in a conventional 2 L glass reactor equipped with mechanical stirrer, reflux condenser, internal temperature sensor and a heating bath. The procedure adopted was analogous to that in example 7, retaining the amounts of solvent and initiator. There was no change either in the times at which each of the additions were made. The reaction time was 24 h.
- The polymers prepared by the process of the invention were diluted down to 35% (solids) with acetone and then applied at 50 g/m2 (solids after drying) to a primed PET (polyethylene terephthalate) film 23 μm thick. The PSA tapes were dried in a drying oven at 120° C. for 10 minutes. The PSA specimens were subsequently irradiated in a UV unit (from Eltosch) with a UV lamp (120 W/cm, 254 nm),in 2 passes at 20 m/min.
- The UV-crosslinked PSA tapes were tested for bond strength on steel (test method A) and for cohesion by a shear test at room temperature and at 70° C. (test method B).
- The results are compiled in table 7.
TABLE 6 Mercapto- functionalized photoinitiator 2-EHA AA 2-HEA IO MA Conc. Example [%] [%] [%] [%] [%] Comp. [%] 13 0 5 0 75 19 I 1 14 46 1 5.5 46 0 II 1.5 15 0 5 0 75 18 III 2 16 88 10 0 0 0 IV 2 17 95 3 0 0 0 I 2 18 60 10 0 20 8 I 2 -
TABLE 7 SST, RT, 10 N SST, 70° C., 10 N Example BS steel [N/cm] [min] [min] 13 4.8 +10 000 6 890 14 5.9 2 325 280 15 5.0 +10 000 7 275 16 4.6 +10 000 +10 000 17 5.3 5 640 1 065 18 4.4 +10 000 +10 000
Claims (5)
1. A process for preparing pressure-sensitively adhesive polyacrylates by free-radical addition polymerization, characterized in that mercapto-functionalized photoinitiators of the general formula (I) and/or (II)
H—S—R (I) R—S—S—R′ (II)
are added to the monomer mixture or to the reaction mixture, R and R′ being chosen independently of one another from the following groups:
a) benzophenone, acetophenone, benzil, benzoin, hydroxyalkylphenone, phenylcyclohexyl ketone, anthraquinone, thioxanthone, triazine, or fluorenone radicals, it being possible for each of these radicals to be substituted by one or more halogen atoms and/or one or more alkoxy groups and/or one or more amino groups or hydroxyl groups,
b) radicals which comprise one or more of the substituted or unsubstituted radicals specified under a).
2. The process of claim 1 , characterized in that the fraction of the compounds (I) and/or (II) is from 0.01 to 5% by weight, based on the monomers employed.
3. The process of at least one of the preceding claims, characterized in that the polymerization takes place using a monomer mixture which comprises at least the following component:
a) acrylic and methacrylic acid monomers of the following structure
where R1═H or CH3
and R2=an alkyl chain having 2-20 carbon atoms
with a fraction of from 65 to 100% by weight,
and which optionally comprises the following component:
b) vinyl compounds having functional groups
with a fraction of from 0 to 35% by weight,
it being possible optionally for further components to be present in the monomer mixture.
4. The process of at least one of the preceding claims, characterized in that the pressure-sensitively adhesive polyacrylates are crosslinked by ultraviolet radiation in a wavelength range from 200 to 400 nm.
5. The use of the pressure-sensitively adhesive polyacrylates of at least one of the preceding claims to produce PSA articles, particularly for producing an adhesive tape comprising an acrylic PSA applied to one or both sides of a backing.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10039212A DE10039212A1 (en) | 2000-08-11 | 2000-08-11 | Process for the preparation of pressure-sensitive polyacrylates using mercapto-functionalized photoinitiators |
DE10039212.1 | 2000-08-11 | ||
PCT/EP2001/009151 WO2002014378A1 (en) | 2000-08-11 | 2001-08-08 | Method for producing adhesive polyacrylates using mercapto functional photoinitiators |
Publications (1)
Publication Number | Publication Date |
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US20040049972A1 true US20040049972A1 (en) | 2004-03-18 |
Family
ID=7652074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/343,523 Abandoned US20040049972A1 (en) | 2000-08-11 | 2001-08-08 | Method for producing adhesive polyacrylates using mercapto functional photoinitiators |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040049972A1 (en) |
EP (1) | EP1311554B1 (en) |
JP (1) | JP2004506756A (en) |
DE (2) | DE10039212A1 (en) |
ES (1) | ES2230356T3 (en) |
WO (1) | WO2002014378A1 (en) |
Cited By (7)
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---|---|---|---|---|
US7271203B2 (en) | 2001-11-24 | 2007-09-18 | Tesa Aktiengesellschaft | Crosslinking of photoiniator-initialized polyacrylates |
WO2008054137A1 (en) * | 2006-11-01 | 2008-05-08 | Lg Chem, Ltd. | Acrylic pressure-sensitive adhesive composition for polarizing plate, containing a photo-initiator group |
US20080132601A1 (en) * | 2006-12-05 | 2008-06-05 | Hoyle Charles E | Benzophenone/thioxanthone derivatives and their use in photopolymerizable compositions |
US20130150479A1 (en) * | 2011-07-29 | 2013-06-13 | Insight High Technology (Beijing) Co. Ltd. | Mercapto Benzophenone Compounds, Compositions and Preparation Method Thereof |
US9410028B2 (en) | 2009-08-12 | 2016-08-09 | Tesa Se | Process for preparing polyacrylates |
US20180243463A1 (en) * | 2015-08-31 | 2018-08-30 | 3M Innovative Properties Company | Negative pressure wound therapy dressings comprising (meth)acrylate pressure-sensitive adhesive with enhanced adhesion to wet surfaces |
CN115701428A (en) * | 2021-08-02 | 2023-02-10 | 上海发微医用材料有限公司 | Photoinitiator and application thereof |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2011184582A (en) * | 2010-03-09 | 2011-09-22 | Three M Innovative Properties Co | Adhesive sheet for optical use |
DE102016200055A1 (en) | 2016-01-06 | 2017-07-06 | Volkswagen Ag | Flow field plate and bipolar plate and fuel cell |
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- 2001-08-08 ES ES01962920T patent/ES2230356T3/en not_active Expired - Lifetime
- 2001-08-08 DE DE50104419T patent/DE50104419D1/en not_active Expired - Lifetime
- 2001-08-08 US US10/343,523 patent/US20040049972A1/en not_active Abandoned
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US7402632B2 (en) | 2001-11-24 | 2008-07-22 | Tesa Aktiengesellschaft | 2-Component crosslink of end-functionalized polyacrylates |
US7271203B2 (en) | 2001-11-24 | 2007-09-18 | Tesa Aktiengesellschaft | Crosslinking of photoiniator-initialized polyacrylates |
US8337961B2 (en) | 2006-11-01 | 2012-12-25 | Lg Chem, Ltd. | Acrylic pressure-sensitive adhesive composition for polarizing plate, containing a photo-initiator group |
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US20180243463A1 (en) * | 2015-08-31 | 2018-08-30 | 3M Innovative Properties Company | Negative pressure wound therapy dressings comprising (meth)acrylate pressure-sensitive adhesive with enhanced adhesion to wet surfaces |
US11660371B2 (en) * | 2015-08-31 | 2023-05-30 | 3M Innovative Properties Company | Negative pressure wound therapy dressings comprising (meth)acrylate pressure-sensitive adhesive with enhanced adhesion to wet surfaces |
CN115701428A (en) * | 2021-08-02 | 2023-02-10 | 上海发微医用材料有限公司 | Photoinitiator and application thereof |
Also Published As
Publication number | Publication date |
---|---|
DE10039212A1 (en) | 2002-02-21 |
WO2002014378A1 (en) | 2002-02-21 |
EP1311554B1 (en) | 2004-11-03 |
JP2004506756A (en) | 2004-03-04 |
DE50104419D1 (en) | 2004-12-09 |
EP1311554A1 (en) | 2003-05-21 |
ES2230356T3 (en) | 2005-05-01 |
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