US4513123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur-curable rubber skim stock compositions containing dithiodipropionic acid
Assignee: Bridgestone Firestone Inc
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Filing: 1983-11-14
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Granted: 1985-04-23
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Expires: 2003-11-14
Abstract
Abstract A sulfur-curable rubber skim stock which upon curing exhibits improved adhesion to brass-plated steel under high humidity, heat aging conditions is provided. The sulfur-curable rubber skim stock comprises natural rubber or a blend of natural rubber and synthetic rubber, carbon black, an organo-cobalt compound, sulfur and a small amount of dithiodipropionic acid. The skim stock can be utilized in various applications where brass-plated steel reinforcement is desirable including tires, conveyor belts, hoses and the like.
Inventors
- 👤 Gary L. Day
- 👤 James P. Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:43
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/10; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; C08J2321/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A sulfur-curable rubber skim stock composition which comprises: (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber and blends of natural rubber and synthetic rubber; (b) from about 30.0 to about 80.0 parts by weight of carbon black; (c) an organo-cobalt compound present in sufficient amount to provide from about 0.05% to about 0.35% by weight of cobalt metal based on total weight of skim stock; (d) from about 2.5 to about 9.0 parts by weight of sulfur; and (e) from about 0.1 to about 2.5 parts by weight of dithiodipropionic acid.
Claim 2
Dependent Claim
99 words
A sulfur-curable rubber skim stock composition which comprises: (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber and blends of natural rubber and synthetic rubber; (b) from about 30.0 to about 80.0 parts by weight of carbon black; (c) an organo-cobalt compound present in sufficient amount to provide from about 0.05% to about 0.35% by weight of cobalt metal based on total weight of skim stock; (d) from about 2.5 to about 9.0 parts by weight of sulfur; and (e) from about 0.1 to about 2.5 parts by weight of dithiodipropionic acid.
Claim 3
Dependent Claim
14 words
The sulfur-curable rubber skim stock of claim 1 wherein said rubber is natural rubber.
Claim 4
Dependent Claim
29 words
The sulfur-curable rubber skim stock of claim 1 wherein said rubber is a blend of natural rubber and synthetic rubber containing up to 35% by weight of synthetic rubber.
Claim 5
Dependent Claim
14 words
The sulfur-curable rubber skim stock of claim 1 wherein said carbon black is HAF.
Claim 6
Dependent Claim
35 words
The sulfur-curable rubber skim stock of claim 1 wherein said organo-cobalt compound is an organo-cobalt complex represented by the formula ##STR4## in which R is an alkyl group having from 9 to 12 carbon atoms.
Claim 7
Dependent Claim
27 words
The sulfur-curable rubber skim stock of claim 1 wherein said carbon black is present in an amount of from about 45.0 to about 70.0 parts by weight.
Claim 8
Dependent Claim
37 words
The sulfur-curable rubber skim stock of claim 1 wherein said organo-cobalt compound is present in sufficient amount to provide from about 0.1 to about 0.2% by weight of cobalt metal based on total weight of skim stock.
Claim 9
Dependent Claim
26 words
The sulfur-curable rubber skim stock of claim 1 wherein said sulfur is present in an amount of from about 4.0 to about 7.0 parts by weight.
Claim 10
Dependent Claim
27 words
The sulfur-curable rubber skim stock of claim 1 wherein said dithiodipropionic acid is present in an amount of from about 0.25 to about 0.75 parts by weight.
References Cited (Backward Citations)
DE158789C
Cited
US4203874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |