US4033933A
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Rubber compositions and methods for production thereof stabilized
Assignee: Kuraray Co Ltd
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Filing: 1975-10-28
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Granted: 1977-07-05
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Expires: 1995-10-28
Abstract
Abstract Synthetic diene rubber stock for the production of vulcanized articles can be improved with respect to thermal discoloration at relatively high temperature by mixing therewith a high molecular weight alkylene oxide compound. The high molecular weight alkylene oxide compound also is effective to facilitate the drying operation of the wet rubber stock by means of a screw type drier.
Inventors
- 👤 Akira Shimizu
- 👤 Manabu Kusano
- 👤 Takeshi Takami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:35
CPC Classifications
C; C08; C08L; C08L9/00; C08K; C08K5/00; C08K5/04; C08K5/06; C08K5/16; C08K5/17; C08L71/00; C08L71/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
284 words
A rubber composition comprising (A) a synthetic cis-1,4-polyisoprene rubber stock and (B) from 0.005 to 5 parts by weight per 100 parts by weight of said rubber stock of a high molecular weight alkylene oxide selected from the group consisting of: (1) polyalkylene glycols and polyalkylene glycol monoalkyl ethers having the general formula: RO(C.sub.x H.sub.2x O).sub.a H (I) wherein R is hydrogen or an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2; (2) polyalkylene glycol monoesters having the general formula: RCOO(C.sub.x H.sub.2x O).sub.a H (II) wherein R is an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2; (3) the ammonia- or amine-polyalkylene glycol adducts of the general formula: ##STR9## wherein at least one of R 1 , R 2 and R 3 is (C x H 2x O) a H, and the others can be hydrogen or an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent a number of at least 2; and (4) the alkylene polyamine-polyalkylene glycol adducts having the general formula: ##STR10## wherein at least one of R 1 , R 2 , R 3 and R 4 is (C x H 2x O) a H and the others can be hydrogen or an alkyl radical containing 1 to 20 carbon atoms; R 5 is an alkylene radical containing 1 to 6 carbon atoms; R 6 is hydrogen, an alkyl radical containing 1 to 20 carbon atoms or (C x H 2x O) a H; x and a, respectively, represent a number of at least 2; and m is zero or a number of at least 1.
Claim 2
Dependent Claim
284 words
A rubber composition comprising (A) a synthetic cis-1,4-polyisoprene rubber stock and (B) from 0.005 to 5 parts by weight per 100 parts by weight of said rubber stock of a high molecular weight alkylene oxide selected from the group consisting of: (1) polyalkylene glycols and polyalkylene glycol monoalkyl ethers having the general formula: RO(C.sub.x H.sub.2x O).sub.a H (I) wherein R is hydrogen or an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2; (2) polyalkylene glycol monoesters having the general formula: RCOO(C.sub.x H.sub.2x O).sub.a H (II) wherein R is an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2; (3) the ammonia- or amine-polyalkylene glycol adducts of the general formula: ##STR9## wherein at least one of R 1 , R 2 and R 3 is (C x H 2x O) a H, and the others can be hydrogen or an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent a number of at least 2; and (4) the alkylene polyamine-polyalkylene glycol adducts having the general formula: ##STR10## wherein at least one of R 1 , R 2 , R 3 and R 4 is (C x H 2x O) a H and the others can be hydrogen or an alkyl radical containing 1 to 20 carbon atoms; R 5 is an alkylene radical containing 1 to 6 carbon atoms; R 6 is hydrogen, an alkyl radical containing 1 to 20 carbon atoms or (C x H 2x O) a H; x and a, respectively, represent a number of at least 2; and m is zero or a number of at least 1.
Claim 3
Dependent Claim
70 words
A rubber composition according to claim 1, wherein the high molecular weight alkylene oxide is a polyalkylene glycol or polyalkylene glycol monoether represented by the general formula: RO(C.sub.x H.sub.2x O).sub.a H wherein R represents a hydrogen atom or an alkyl radical of 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2 and said alkylene oxide has a molecular weight ranging from 140 to 50,000.
Claim 4
Dependent Claim
22 words
A rubber composition according to claim 2 wherein said polyalkylene glycol is polyethylene glycol having a molecular weight of 200 to 20,000.
Claim 5
Dependent Claim
22 words
A rubber composition according to claim 2, wherein said polyalkylene glycol is polypropylene glycol having a molecular weight of 300 to 6,000.
Claim 6
Dependent Claim
62 words
A rubber composition according to claim 1, wherein the high molecular weight alkylene oxide is a polyalkylene glycol monoester represented by the general formula: RCOO(C.sub.x H.sub.2x O).sub.a H wherein R is an alkyl radical of 1 to 20 carbon atoms; x and a, respectively, are numbers of at least 2 and said alkylene oxide has a molecular weight of 140 to 50,000.
Claim 7
Dependent Claim
103 words
A rubber composition according to claim 1, wherein the high molecular weight alkylene oxide is an ammonia- or amine-polyalkylene glycol adduct represented by the general formula: ##STR11## wherein each of R 1 , R 2 and R 3 can be (C x H 2x O) a H, hydrogen, or alkyl radicals of 1 to 20 carbon atoms with the proviso that at least one of R 1 , R 2 and R 3 is (C x H 2x O) a H; x and a, respectively, are numbers of at least 2 and said alkylene oxide has a molecular weight of 140 to 50,000.
Claim 8
Dependent Claim
137 words
A rubber composition according to claim 1, wherein the high molecular weight alkylene oxide is an alkylenepolyamine-polyalkylene glycol adduct of the general formula: ##STR12## wherein each of R 1 , R 2 , R 3 and R 4 can be (C x H 2x O)aH, hydrogen, or an alkyl radical of 1 to 20 carbon atoms with the proviso that at least one of R 1 , R 2 , R 3 and R 4 is (C x H 2x O) a H; R 5 is an alkylene radical of 1 to 6 carbon atoms; R 6 is hydrogen, an alkyl radical of 1 to 20 carbon atoms or (C x H 2x O) a H; x and a, respectively, are numbers of at least 2; and m is 0 or a number of at least 1.
Claim 9
Dependent Claim
28 words
A rubber composition according to claim 1, wherein said rubber stock is modified synthetic cis-1,4-polyisoprene obtained by reacting the cis-1,4-polyisoprene rubber with maleic acid, maleic anhydride or maleimide.
Claim 10
Independent Claim
313 words
A method of suppressing a tendency toward thermal discoloration and plugging of a rubber composition prior to compounding for vulcanization, which comprises feeding a wet synthetic cis-1,4-polyisoprene rubber stock to a screw-type dryer and adding thereto 0.005 to 5 weight parts per 100 weight parts of said rubber stock of a high molecular weight alkylene oxide selected from the group consisting of: (1) polyalkylene glycols and polyalkylene glycol monoalkyl ethers having the general formula: RO(C.sub.x H.sub.2x O).sub.a H (I) wherein R is hydrogen or an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2; (2) polyalkylene glycol monoesters having the general formula: RCOO(C.sub.x H.sub.2x O).sub.a H (II) wherein R is an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2; (3) the ammonia- or amine-polyalkylene glycol adducts of the general formula: ##STR13## wherein at least one of R 1 , R 2 and R 3 is (C x H 2x O) a H, and the others can be hydrogen or an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent a number of at least 2; and (4) the alkylene polyamine-polyalkylene glycol adducts having the general formula: ##STR14## wherein at least one of R 1 , R 2 , R 3 and R 4 is (C x H 2x O) a H and the others can be hydrogen or an alkyl radical containing 1 to 20 carbon atoms; R 5 is an alkylene radical containing 1 to 6 carbon atoms; R 6 is hydrogen, and alkyl radical containing 1 to 20 carbon atoms or (C x H 2x O) a H; x and a, respectively, represent a number of at least 2; and m is zero or a number of at least 1, before the rubber is discharged from said dryer.
Claim 11
Independent Claim
313 words
A method of suppressing a tendency toward thermal discoloration and plugging of a rubber composition prior to compounding for vulcanization, which comprises feeding a wet synthetic cis-1,4-polyisoprene rubber stock to a screw-type dryer and adding thereto 0.005 to 5 weight parts per 100 weight parts of said rubber stock of a high molecular weight alkylene oxide selected from the group consisting of: (1) polyalkylene glycols and polyalkylene glycol monoalkyl ethers having the general formula: RO(C.sub.x H.sub.2x O).sub.a H (I) wherein R is hydrogen or an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2; (2) polyalkylene glycol monoesters having the general formula: RCOO(C.sub.x H.sub.2x O).sub.a H (II) wherein R is an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent numbers of at least 2; (3) the ammonia- or amine-polyalkylene glycol adducts of the general formula: ##STR13## wherein at least one of R 1 , R 2 and R 3 is (C x H 2x O) a H, and the others can be hydrogen or an alkyl radical containing 1 to 20 carbon atoms; x and a, respectively, represent a number of at least 2; and (4) the alkylene polyamine-polyalkylene glycol adducts having the general formula: ##STR14## wherein at least one of R 1 , R 2 , R 3 and R 4 is (C x H 2x O) a H and the others can be hydrogen or an alkyl radical containing 1 to 20 carbon atoms; R 5 is an alkylene radical containing 1 to 6 carbon atoms; R 6 is hydrogen, and alkyl radical containing 1 to 20 carbon atoms or (C x H 2x O) a H; x and a, respectively, represent a number of at least 2; and m is zero or a number of at least 1, before the rubber is discharged from said dryer.
Claim 12
Dependent Claim
23 words
A method according to claim 9, wherein said alkylene oxide compound is a polyalkylene glycol having a molecule weight of 140 to 50,000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |