US3867334A
Expired / Lapsed
US
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Antihardeners for polymers
Assignee: Goodyear Tire and Rubber Co
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Filing: 1974-01-30
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Granted: 1975-02-18
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Expires: 1994-01-30
Abstract
Abstract Amide age resisters such as N-(4-anilinophenyl) acrylamide and methacrylamide are added to certain diene polymers such as SBR, NBR and natural rubber prior to compounding with reinforcing agents such as carbon black, thereby improving the hardening resistance of the subsequently sulfur vulcanized polymer.
Inventors
- 👤 Frank S Maxey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:24
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/20; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
IN A PROCESS OF PREPARING AN UNVULCANIZED CONJUGATED DIENE POLYMER CONTAINING A REINFORCING AGENT, SAID POLYMER CONTAINING NOT MORE THAN 0.25 PART BY WEIGHT PER 100 PARTS BY WEIGHT OF AN ANTI-HARDENER AND BEING CAPABLE OF BEING VULCANIZED WITH A SULFUR-TYPE VULCANIZATION SYSTEM TO FORM A VULCANIZATE, SAID VULCANIZATE HAVING A TENDENCY TO HARDEN, THE IMPROVEMENT WHEREIN AN AMIDE, IN THE AMOUNT OF AT LEAST 0.25 PART BY WEIGHT PER 100 PARTS BY WEIGHT OF POLYMER, IS ADDED TO THE POLYMER BEFORE ALL OF THE REINFORCING AGENT HAS BEEN ADDED TO THE POLYMER WITH THE PROVISO THAT THE POLYMER CONTAINS LESS THAN 30 PARTS BY WEIGHT OF REINFORCING AGENT PER 100 PARTS BY WEIGHT OF POLYMER WHEN THE AMIDE IS ADDED AND WHEREIN THE AMIDE HAS THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
130 words
IN A PROCESS OF PREPARING AN UNVULCANIZED CONJUGATED DIENE POLYMER CONTAINING A REINFORCING AGENT, SAID POLYMER CONTAINING NOT MORE THAN 0.25 PART BY WEIGHT PER 100 PARTS BY WEIGHT OF AN ANTI-HARDENER AND BEING CAPABLE OF BEING VULCANIZED WITH A SULFUR-TYPE VULCANIZATION SYSTEM TO FORM A VULCANIZATE, SAID VULCANIZATE HAVING A TENDENCY TO HARDEN, THE IMPROVEMENT WHEREIN AN AMIDE, IN THE AMOUNT OF AT LEAST 0.25 PART BY WEIGHT PER 100 PARTS BY WEIGHT OF POLYMER, IS ADDED TO THE POLYMER BEFORE ALL OF THE REINFORCING AGENT HAS BEEN ADDED TO THE POLYMER WITH THE PROVISO THAT THE POLYMER CONTAINS LESS THAN 30 PARTS BY WEIGHT OF REINFORCING AGENT PER 100 PARTS BY WEIGHT OF POLYMER WHEN THE AMIDE IS ADDED AND WHEREIN THE AMIDE HAS THE FOLLOWING STRUCTURAL FORMULA:
Claim 3
Dependent Claim
21 words
The vulcanizate prepared by vulcanizing the unvulcanized conjugated diene polymer of claim 1 with an efficient or semi-effIcient sulfur-type vulcanization system.
Claim 4
Dependent Claim
13 words
The unvulcanized conjugated diene polymer prepared according to the process of claim 1.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the reinforcing agent is carbon black.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the conjugated diene is butadiene-1,3.
Claim 7
Dependent Claim
42 words
The process of claim 5 wherein the polymer is a copolymer containing at least 40 parts by weight of butadiene-1,3 per 100 parts by weight of polymer and as a comonomer a monomer selected from the group consisting of styrene and acrylonitrile.
Claim 8
Dependent Claim
11 words
The process according to claim 1 wherein the amide is N-(4-anilinophenyl)-methacrylamide.
Claim 9
Dependent Claim
31 words
The process according to claim 1 wherein the polymer contains less than 20 parts by weight of reinforcing agent per 100 parts by weight of polymer when the amide is added.
Claim 10
Dependent Claim
31 words
The process according to claim 1 wherein the polymer contains less than 10 parts by weight of reinforcing agent per 100 parts by weight of polymer when the amide is added.
Claim 11
Dependent Claim
27 words
The vulcanizate according to claim 2 wherein the vulcanization system contains 0 to 0.5 part by weight of free sulfur per 100 parts by weight of polymer.
References Cited (Backward Citations)
US3576003A
Cited
US3658769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |