US3821133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion-resistant vulcanizates
Assignee: PPG Industries Inc
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Filing: 1971-12-06
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Granted: 1974-06-28
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Expires: 1991-12-06
Abstract
Abstract Abrasion-resistant vulcanizates are provided comprising a rubber, finely-divided reinforcing siliceous pigment, a compound having a plurality of reactive amino groups, an aromatic hydroxy compound, and a methylene donor. Rubber additives are provided comprising a finely-divided siliceous pigment having adsorbed thereon at least one but not more than two of the group selected from a compound having a plurality of reactive amino groups, an aromatic hydroxy compound, and a methylene donor.
Inventors
- 👤 T Doran
- 👤 H Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:07
CPC Classifications
C; C08; C08L; C08L21/00; C08K; C08K3/00; C08K3/34; C08K3/36; C08K9/00; C08K9/12; Y; Y10; Y10S; Y10S152/00; Y10S152/905; Y10S524/00; Y10S524/925; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
12 words
The vulcanizate of claim 1 wherein the siliceous pigment is precipitated silica.
Claim 2
Dependent Claim
14 words
The vulcanizate of claim 1 wherein the compound having reactive amino groups is polyethylenimine.
Claim 3
Dependent Claim
41 words
The vulcanizate of claim 1 wherein the compound containing reactive amino groups, the methylene donor, and aromatic hydroxy compound are individually present in an amount from between about 1 and about 8 parts per 100 parts by weight of the rubber.
Claim 4
Dependent Claim
60 words
The vulcanizate of claim 1 wherein the siliceous pigment is present in amounts of between about 5 and about 100 parts per 100 parts by weight of rubber and the aromatic hydroxy compound, methylene donor compound and compound containing reactive amino groups are each individually present between about 0.5 and about 8 parts per 100 parts by weight of rubber.
Claim 5
Dependent Claim
86 words
An abrasion-resistant vulcanizate of rubber selected from styrene-butadiene rubber, butadiene rubber, EPDM rubber, and natural rubber, precipitated siliceous pigment, polyethylenimine having at least five reactive amino groups, at least one of which amino groups is a primary amino group, resorcinol, and hexamethylenetetramine, wherein the siliceous pigment is present in an amount between about 5 to about 100 parts and the polyethylene imine, resorcinol and hexamethylenetetramine are each individually present in an amount between about 0.5 and about 8 parts per hundred parts by weight of rubber.
Claim 6
Dependent Claim
11 words
The vulcanizate of claim 6 wherein the rubber is natural rubber.
Claim 7
Dependent Claim
15 words
The vulcanizate of claim 3 wherein the polyethylenimine has at least five reactive amino groups.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |