CA2236526C - Methods for inhibiting the polymerization of ethylenically unsaturated monomers - Google Patents
Methods for inhibiting the polymerization of ethylenically unsaturated monomers Download PDFInfo
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- CA2236526C CA2236526C CA002236526A CA2236526A CA2236526C CA 2236526 C CA2236526 C CA 2236526C CA 002236526 A CA002236526 A CA 002236526A CA 2236526 A CA2236526 A CA 2236526A CA 2236526 C CA2236526 C CA 2236526C
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- Prior art keywords
- acid
- polymerization
- inhibiting
- ethylenically unsaturated
- isoprene
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- 238000006116 polymerization reaction Methods 0.000 title claims abstract description 20
- 230000002401 inhibitory effect Effects 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 12
- 239000000178 monomer Substances 0.000 title abstract description 30
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims abstract description 22
- DRBARRGCABOUIE-UHFFFAOYSA-N 2,3-dihydroxy-3-phenylprop-2-enoic acid Chemical compound OC(=O)C(O)=C(O)C1=CC=CC=C1 DRBARRGCABOUIE-UHFFFAOYSA-N 0.000 claims abstract description 20
- SIUKXCMDYPYCLH-UHFFFAOYSA-N dihydroxycinnamic acid Natural products OC(=O)C=CC1=CC=CC(O)=C1O SIUKXCMDYPYCLH-UHFFFAOYSA-N 0.000 claims abstract description 18
- XQKJQIUZEFAGFC-UHFFFAOYSA-N 2,2-dihydroxy-3-phenylpropanoic acid Chemical compound OC(=O)C(O)(O)CC1=CC=CC=C1 XQKJQIUZEFAGFC-UHFFFAOYSA-N 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 abstract description 6
- JIGUICYYOYEXFS-UHFFFAOYSA-N 3-tert-butylbenzene-1,2-diol Chemical compound CC(C)(C)C1=CC=CC(O)=C1O JIGUICYYOYEXFS-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 150000001993 dienes Chemical class 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Natural products OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 3
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- DZAUWHJDUNRCTF-UHFFFAOYSA-N 3-(3,4-dihydroxyphenyl)propanoic acid Chemical compound OC(=O)CCC1=CC=C(O)C(O)=C1 DZAUWHJDUNRCTF-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 235000006708 antioxidants Nutrition 0.000 description 2
- 235000010323 ascorbic acid Nutrition 0.000 description 2
- 229960005070 ascorbic acid Drugs 0.000 description 2
- 239000011668 ascorbic acid Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- QAIPRVGONGVQAS-UHFFFAOYSA-N cis-caffeic acid Natural products OC(=O)C=CC1=CC=C(O)C(O)=C1 QAIPRVGONGVQAS-UHFFFAOYSA-N 0.000 description 2
- GVJHHUAWPYXKBD-UHFFFAOYSA-N d-alpha-tocopherol Natural products OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 235000010384 tocopherol Nutrition 0.000 description 2
- 239000011732 tocopherol Substances 0.000 description 2
- 229960001295 tocopherol Drugs 0.000 description 2
- 229930003799 tocopherol Natural products 0.000 description 2
- QAIPRVGONGVQAS-DUXPYHPUSA-N trans-caffeic acid Chemical compound OC(=O)\C=C\C1=CC=C(O)C(O)=C1 QAIPRVGONGVQAS-DUXPYHPUSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- GVJHHUAWPYXKBD-IEOSBIPESA-N α-tocopherol Chemical compound OC1=C(C)C(C)=C2O[C@@](CCC[C@H](C)CCC[C@H](C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-IEOSBIPESA-N 0.000 description 2
- ACEAELOMUCBPJP-UHFFFAOYSA-N (E)-3,4,5-trihydroxycinnamic acid Natural products OC(=O)C=CC1=CC(O)=C(O)C(O)=C1 ACEAELOMUCBPJP-UHFFFAOYSA-N 0.000 description 1
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- MFFCZSWTQMCKFP-OWOJBTEDSA-N 3,5-dihydroxycinnamic acid Chemical compound OC(=O)\C=C\C1=CC(O)=CC(O)=C1 MFFCZSWTQMCKFP-OWOJBTEDSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- -1 ascorbic acid ester Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000004883 caffeic acid Nutrition 0.000 description 1
- 229940074360 caffeic acid Drugs 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- LABSLXOWZIMSBL-UHFFFAOYSA-N dehydrodiooniferyl alcohol Natural products O1C=2C(OC)=CC(C=CCOC)=CC=2C(CO)C1C1=CC=C(O)C=C1 LABSLXOWZIMSBL-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 235000019261 food antioxidant Nutrition 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- ZVEZMVFBMOOHAT-UHFFFAOYSA-N nonane-1-thiol Chemical compound CCCCCCCCCS ZVEZMVFBMOOHAT-UHFFFAOYSA-N 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 229940038597 peroxide anti-acne preparations for topical use Drugs 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- DOIRQSBPFJWKBE-UHFFFAOYSA-N phthalic acid di-n-butyl ester Natural products CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 1
- 229920001184 polypeptide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000451 tissue damage Effects 0.000 description 1
- 231100000827 tissue damage Toxicity 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K15/00—Anti-oxidant compositions; Compositions inhibiting chemical change
- C09K15/04—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds
- C09K15/06—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds containing oxygen
- C09K15/08—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds containing oxygen containing a phenol or quinone moiety
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/20—Use of additives, e.g. for stabilisation
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K15/00—Anti-oxidant compositions; Compositions inhibiting chemical change
- C09K15/04—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds
- C09K15/06—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds containing oxygen
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The polymerization of an ethylenically unsaturated monomer such as isoprene and butadiene is inhibited during storage or handling thereof by the addition of a dihydroxycinnamic acid or derivative thereof.
Description
WO 97!42146 PCT/US97/06099 t METHODS FOR INHIBITING THE POLYMERIZATION OF
ETHYLENICALLY UNSATURATED MONOMERS
TECHNICAL FIELD
This invention relates to methods for inhibiting polymerization of ethyfenicaliy unsaturated monomers. The methods are particularly effec-tive at inhibiting polymerization of these monomers during storage condi-tions in the presence of oxygen.
BACKGROUND ART
it is well known that ethylenically unsaturated monomers readily polymerize when heated and that the polymerization rate increases with increasing temperature. For this reason, the monomers are stabilized by the addition of substances which act as inhibitors or retarders of polym-erization, or which block the initiation mechanism leading to the formation of radicals.
Certain ethylenicalfy unsaturated (diolefin) monomers such as butadiene and isoprene polymerize when left in storage tanks and during transportation at temperatures as low as room temperature. This polym-erization is initiated by reaction of the diolefin monomer with oxygen present in the monomer containing system. This reaction forms perox-ides and free radical species which can further react with the diolefin monomer.
ETHYLENICALLY UNSATURATED MONOMERS
TECHNICAL FIELD
This invention relates to methods for inhibiting polymerization of ethyfenicaliy unsaturated monomers. The methods are particularly effec-tive at inhibiting polymerization of these monomers during storage condi-tions in the presence of oxygen.
BACKGROUND ART
it is well known that ethylenically unsaturated monomers readily polymerize when heated and that the polymerization rate increases with increasing temperature. For this reason, the monomers are stabilized by the addition of substances which act as inhibitors or retarders of polym-erization, or which block the initiation mechanism leading to the formation of radicals.
Certain ethylenicalfy unsaturated (diolefin) monomers such as butadiene and isoprene polymerize when left in storage tanks and during transportation at temperatures as low as room temperature. This polym-erization is initiated by reaction of the diolefin monomer with oxygen present in the monomer containing system. This reaction forms perox-ides and free radical species which can further react with the diolefin monomer.
To prevent this polymerization from taking place, diolefin monomer manufacturers frequently add tert-butyl catechol (TBC) as a polymeriza-tion inhibitor. However, TBC is a toxic compound and can cause tissue damage when it contacts skin. These characteristics make it desirable to utilize an inhibitor compound that avoids these difFiculties as well as being water and caustic extractable so that it could be easily removed from the finished product before use or additional processing.
The present inventor has discovered that dihydroxycinnamic acid and its derivatives effectively inhibit the polymerization of ethylenically unsaturated monomers during storage and transportation. These com-pounds prove particularly effective in the presence of oxygen and at temperatures up to 100°C.
EP 89-402156 discloses a cosmetic preparation containing an anti-oxidant system based on a stabilized ascorbic acid ester. The antioxidant system also contains tocopherol or mixtures of tocopherol, caffeic acid or its derivatives, a complexing agent and a non-thiol polypeptide.
JP Kokai JP 59015477 teaches a food antioxidant composition effective for oils and fats which comprises 3,4-dihydroxycinnamic acid esters and one or more of ascorbic acid-stearic acid ester, citric acid, malic acid, and ascorbic acid.
DISCLOSURE OF lNVENT10N
The present invention relates to methods far inhibiting the polym- ., erization of ethyfenically unsaturated monomers comprising adding an effective inhibiting amount of a dihydroxydihydrocinnamic acid or a d.ihydroxycinnamic acid or derivative thereof.
r The dihydroxycinnamic acid or derivatives thereofi generally have the formula:
HC = C - COOR
O R' OR' wherein R is H, CH3 or C2H5; R' is H, CH3 or C2H5 with the proviso that at least one of R' is H. The preferred compounds for use in the present invention are dihydroxycinnamic acid and dihydroxydihydrocinnamic acid.
The ethylenically unsaturated monomers are characterized as polymerizable ethylenically unsaturated hydrocarbons and include oie-phins such as alpha olephins containing 2 to 20 carbon atoms and preferably 2 to 8 carbon atoms, and conjugated di-olephins, preferably those containing 4 to 6 carbon atoms such as isoprene and butadiene.
For purposes of this invention, the term "effective amount" refers to the amount of dihydroxycinnamic acid or derivative thereof necessary to inhibit polymerization of ethylenically unsaturated monomers. This amount will vary according to the conditions under which the ethylenicafly unsatu-rated monomer is subjected during storage and/or handling thereof. At higher temperatures and higher monomer contamination, larger amounts of polymerization inhibiting compound are generally required.
The present inventor has discovered that dihydroxycinnamic acid and its derivatives effectively inhibit the polymerization of ethylenically unsaturated monomers during storage and transportation. These com-pounds prove particularly effective in the presence of oxygen and at temperatures up to 100°C.
EP 89-402156 discloses a cosmetic preparation containing an anti-oxidant system based on a stabilized ascorbic acid ester. The antioxidant system also contains tocopherol or mixtures of tocopherol, caffeic acid or its derivatives, a complexing agent and a non-thiol polypeptide.
JP Kokai JP 59015477 teaches a food antioxidant composition effective for oils and fats which comprises 3,4-dihydroxycinnamic acid esters and one or more of ascorbic acid-stearic acid ester, citric acid, malic acid, and ascorbic acid.
DISCLOSURE OF lNVENT10N
The present invention relates to methods far inhibiting the polym- ., erization of ethyfenically unsaturated monomers comprising adding an effective inhibiting amount of a dihydroxydihydrocinnamic acid or a d.ihydroxycinnamic acid or derivative thereof.
r The dihydroxycinnamic acid or derivatives thereofi generally have the formula:
HC = C - COOR
O R' OR' wherein R is H, CH3 or C2H5; R' is H, CH3 or C2H5 with the proviso that at least one of R' is H. The preferred compounds for use in the present invention are dihydroxycinnamic acid and dihydroxydihydrocinnamic acid.
The ethylenically unsaturated monomers are characterized as polymerizable ethylenically unsaturated hydrocarbons and include oie-phins such as alpha olephins containing 2 to 20 carbon atoms and preferably 2 to 8 carbon atoms, and conjugated di-olephins, preferably those containing 4 to 6 carbon atoms such as isoprene and butadiene.
For purposes of this invention, the term "effective amount" refers to the amount of dihydroxycinnamic acid or derivative thereof necessary to inhibit polymerization of ethylenically unsaturated monomers. This amount will vary according to the conditions under which the ethylenicafly unsatu-rated monomer is subjected during storage and/or handling thereof. At higher temperatures and higher monomer contamination, larger amounts of polymerization inhibiting compound are generally required.
Preferably the effective amount of dihydroxycinnamic acid or de-rivative added to the ethylenically unsaturated monomer ranges from about 1 part to about 1000 parts per million parts of monomer. More pref-erably, the amount of dihydroxycinnamic acid or derivative thereof added to the monomer ranges from about 10 parts to about 200 parts per million parts monomer.
The dihydroxycinnamic acid derivatives may be used in combination with the dihydroxycinnamic acid or as a mixture of the dihydroxycinnamic acid derivatives when utilized in the methods of the present invention.
The dihydroxycinnamic acid or derivative thereof may be added to the ethylenically unsaturated monomer as either a dispersion or as a solution using a suitable liquid carrier or solvent. Any solvent that is compatible with the dihydroxycinnamic acid or derivative thereof and the ethyfenically unsaturated monomer may be employed.
MODES FOR CARRYING OUT THE fNVENTtON
The invention will now be described with reference to a number of specific examples which are to be regarded solely as illustrative, and not as restricting the scope of the invention.
EXAMPLES
Testing was performed to determine the effectiveness of the pres-ent invention at inhibiting the polymerization of ethylenically unsaturated monomers.
Tests were run in a stainless steel pressure vessel fitted with a glass sample container and cover, a stem, a pressure gauge with a con-tinuous recorder, and the appropriate valves and fittings. A solution of 10 mL of isoprene in 40 mL of heptane and the designated treatment were 5 placed in the glass sample container and inside the pressure vessel. The vessel was closed, filled with oxygen at 100 psig and heated in a water bath at 100°C. The pressure was recorded continuously until a break point in the pressure-time curve (i.e., steepest slope of the curve) was reached. The induction time was calculated as the time elapsed between the placing of the vessel in the bath and the breaking point. The results of this testing are reported in Table I.
TABLE!
Polymerization inhibition Testing Treatment Dose ppm) Induction Time lmin.) Blank _____ 25 Blank _____ 21 Blank ----- 25 TBC is tert-butyl catechol BHT is 2,6-di-t-butyl-4-methylphenol DHCA is 3,5-dihydroxycinnamic acid DHHCA is 3,4-dihydroxyhydrocinnamic acid These results demonstrate that the compounds of the present invention are effective at inhibiting the polymerization of ethylenically unsaturated monomers under conditions approximating storage. The commercially available inhibitors, TBC and BHT proved less effective than the inventive compounds.
INDUSTRIAL APPLlCABlLITY
The dihydroxycinnamic acid or derivatives thereof are effective at inhibiting the polymerization of ethylenically unsaturated monomers dur ing their storage or under transportation conditions. These conditions are typically found to have oxygen atmospheres present and monomer tem-peratures up to about 100°C. The present inventor anticipates that the methods of the present invention can inhibit the polymerization of ethyl-enically unsaturated monomers during the processing thereof. These processing conditions, such as purification and distillation processes, typically employ heat and will often cause fouling of the monomer.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modi-fications of this invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover ail such obvious forms and modifications which are within the true spirit and scope of the present invention.
The dihydroxycinnamic acid derivatives may be used in combination with the dihydroxycinnamic acid or as a mixture of the dihydroxycinnamic acid derivatives when utilized in the methods of the present invention.
The dihydroxycinnamic acid or derivative thereof may be added to the ethylenically unsaturated monomer as either a dispersion or as a solution using a suitable liquid carrier or solvent. Any solvent that is compatible with the dihydroxycinnamic acid or derivative thereof and the ethyfenically unsaturated monomer may be employed.
MODES FOR CARRYING OUT THE fNVENTtON
The invention will now be described with reference to a number of specific examples which are to be regarded solely as illustrative, and not as restricting the scope of the invention.
EXAMPLES
Testing was performed to determine the effectiveness of the pres-ent invention at inhibiting the polymerization of ethylenically unsaturated monomers.
Tests were run in a stainless steel pressure vessel fitted with a glass sample container and cover, a stem, a pressure gauge with a con-tinuous recorder, and the appropriate valves and fittings. A solution of 10 mL of isoprene in 40 mL of heptane and the designated treatment were 5 placed in the glass sample container and inside the pressure vessel. The vessel was closed, filled with oxygen at 100 psig and heated in a water bath at 100°C. The pressure was recorded continuously until a break point in the pressure-time curve (i.e., steepest slope of the curve) was reached. The induction time was calculated as the time elapsed between the placing of the vessel in the bath and the breaking point. The results of this testing are reported in Table I.
TABLE!
Polymerization inhibition Testing Treatment Dose ppm) Induction Time lmin.) Blank _____ 25 Blank _____ 21 Blank ----- 25 TBC is tert-butyl catechol BHT is 2,6-di-t-butyl-4-methylphenol DHCA is 3,5-dihydroxycinnamic acid DHHCA is 3,4-dihydroxyhydrocinnamic acid These results demonstrate that the compounds of the present invention are effective at inhibiting the polymerization of ethylenically unsaturated monomers under conditions approximating storage. The commercially available inhibitors, TBC and BHT proved less effective than the inventive compounds.
INDUSTRIAL APPLlCABlLITY
The dihydroxycinnamic acid or derivatives thereof are effective at inhibiting the polymerization of ethylenically unsaturated monomers dur ing their storage or under transportation conditions. These conditions are typically found to have oxygen atmospheres present and monomer tem-peratures up to about 100°C. The present inventor anticipates that the methods of the present invention can inhibit the polymerization of ethyl-enically unsaturated monomers during the processing thereof. These processing conditions, such as purification and distillation processes, typically employ heat and will often cause fouling of the monomer.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modi-fications of this invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover ail such obvious forms and modifications which are within the true spirit and scope of the present invention.
Claims (7)
1. A method for inhibiting the polymerization of isoprene comprising adding to the isoprene an effective polymerization inhibiting amount of a dihydroxydihydrocinnamic acid or a dihydroxycinnamic acid or derivative thereof having the formula wherein R is H, CH3 or C2H5; R1 is H, CH3 or C2H5 with the proviso that at least one of R1 is H.
2. The method as claimed in claim 1, wherein said dihydroxydihydrocinnamic acid or said dihydroxycinnamic acid or derivative thereof is selected from the group consisting of dihydroxycinnamic acid and dihydroxydihydrocinnamic acid.
3. The method as claimed in claim 1 or 2, wherein said dihydroxydihydrocinnamic acid or said dihydroxycinnamic acid or derivative thereof is added to said isoprene in an amount ranging from 1 part to 1000 parts per million parts of isoprene.
4. The method as claimed in claim 1, 2 or 3, wherein said isoprene is exposed to oxygen.
5. The method as claimed in any one of claims 1 to 4, wherein said isoprene has a temperature ranging from ambient to 100°C.
6. A composition comprising isoprene and a dihydroxydihydrocinnamic acid or a dihydroxycinnamic acid or derivative thereof having the formula wherein R is H, CH3 or C2H5; R1 is H, CH3 or C2H5 with the proviso that at least one of R1 is H.
7. The composition as claimed in claim 6, wherein said dihydroxydihydrocinnamic acid or said dihydroxycinnamic acid or derivative thereof is selected from the group consisting of dihydroxycinnamic acid and dihydroxydihydrocinnamic acid.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/642,836 US5756870A (en) | 1996-05-03 | 1996-05-03 | Methods for inhibiting the polymerization of ethylenically unsaturated monomers |
| US08/642,836 | 1996-05-03 | ||
| PCT/US1997/006099 WO1997042146A1 (en) | 1996-05-03 | 1997-04-04 | Methods for inhibiting the polymerization of ethylenically unsaturated monomers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2236526A1 CA2236526A1 (en) | 1997-11-13 |
| CA2236526C true CA2236526C (en) | 2006-08-01 |
Family
ID=36764308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002236526A Expired - Fee Related CA2236526C (en) | 1996-05-03 | 1997-04-04 | Methods for inhibiting the polymerization of ethylenically unsaturated monomers |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2236526C (en) |
-
1997
- 1997-04-04 CA CA002236526A patent/CA2236526C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2236526A1 (en) | 1997-11-13 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20150407 |