US3953223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siliceous pigment composition
Assignee: PPG Industries Inc
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Filing: 1974-04-05
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Granted: 1976-04-27
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Expires: 1994-04-05
Abstract
Abstract Abrasion-resistant vulcanizates are provided comprising a rubber, a 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
- 👤 Thomas J. Doran, Jr.
- 👤 Henry C. Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:30
CPC Classifications
C; C08; C08L; C08L21/00; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/16; C08K5/17; C08K9/00; C08K9/12; C08L7/00; C08L79/00; C08L79/04; C08L79/08; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A composition useful for reinforcing rubber, which comprises reinforcing siliceous pigment having adsorbed on its surface (a) a compound selected from polymers of ethylenimine, propylenimine, 1,2-butylenimine, 2,3-butylenimine, 2-methyl propylenimine, alkyloxyalkylenimine, unsaturated polyalkylene amines and cycloalkylenimines, said polymers having a plurality of reactive amino groups, at least one of which reactive amino groups is a primary amino group, and (b) a methylene-donor compound selected from hexamethylenetetramine, hexamethoxymethyl melamine and paraformaldehyde, each of said adsorbed compounds being present on the siliceous pigment in an amount of between about 0.1 and about 15 parts per 100 of rubber reinforced by said pigment.
Claim 2
Dependent Claim
99 words
A composition useful for reinforcing rubber, which comprises reinforcing siliceous pigment having adsorbed on its surface (a) a compound selected from polymers of ethylenimine, propylenimine, 1,2-butylenimine, 2,3-butylenimine, 2-methyl propylenimine, alkyloxyalkylenimine, unsaturated polyalkylene amines and cycloalkylenimines, said polymers having a plurality of reactive amino groups, at least one of which reactive amino groups is a primary amino group, and (b) a methylene-donor compound selected from hexamethylenetetramine, hexamethoxymethyl melamine and paraformaldehyde, each of said adsorbed compounds being present on the siliceous pigment in an amount of between about 0.1 and about 15 parts per 100 of rubber reinforced by said pigment.
Claim 3
Dependent Claim
12 words
The composition of claim 1, wherein the siliceous pigment is precipitated silica.
Claim 4
Dependent Claim
21 words
The composition of claim 2, wherein the compound having reactive amino groups is polyethylenimine and the methylene donor compound is hexamethylenetetramine.
Claim 5
Dependent Claim
15 words
The composition of claim 3, wherein the polyethylenimine has at least five reactive amino groups.
Claim 6
Dependent Claim
31 words
The composition of claim 1, wherein the adsorbed members are present in an amount of between about 0.5 and about 8 parts per 100 parts of rubber reinforced by said pigment.
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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |