US4202952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of vulcanizing bromobutyl rubber with amino acids
Assignee: Sanyo Trading Co Ltd
•
Filing: 1977-11-14
•
Granted: 1980-05-13
•
Expires: 1997-11-14
Abstract
Abstract A vulcanizable composition comprising a bromobutyl rubber and a specific amino acid.
Inventors
- 👤 Masao Onizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:30
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
A method of vulcanizing bromobutyl rubber which comprises incorporating a vulcanizing amount of at least one amino acid selected from the group consisting of arginine, lysine, hydroxylysine, ornithine, cystine, asparagine, glutamine and citrulline into bromobutyl rubber, and subjecting the resultant mixture, which does not contain any sulfur, sulfur-donor, zinc oxide, lead oxide or vulcanization accelerator, to vulcanization.
Claim 2
Independent Claim
57 words
A method of vulcanizing bromobutyl rubber which comprises incorporating a vulcanizing amount of at least one amino acid selected from the group consisting of arginine, lysine, hydroxylysine, ornithine, cystine, asparagine, glutamine and citrulline into bromobutyl rubber, and subjecting the resultant mixture, which does not contain any sulfur, sulfur-donor, zinc oxide, lead oxide or vulcanization accelerator, to vulcanization.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein vulcanization is carried out at a temperature of 140°-180° C. and a pressure of 180-210 Kg/cm 2 .
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein 0.1-50 parts by weight of the amino acid component is incorporated into 100 parts by weight of the bromobutyl rubber.
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) | 1983-05-13 | 1983-11-12 | 1984-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-13 | 1987-11-12 | 1988-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-13 | 1991-11-12 | 1992-05-13 | $7700.00 | Window Closed / Lapsed |