Patent US4350402A successfully refreshed from Google Patents.
Patent US3715172A successfully refreshed from Google Patents.
US3715172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea- and melamine- formaldehyde bridging agents
Assignee: ChampionX LLC
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Filing: 1971-01-12
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Granted: 1973-02-06
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Expires: 1991-01-12
Abstract
Abstract Method and composition for a dry mix utilizing a natural or synthetic rubber stock containing a non-reinforcing filler and about 0,1 to 10 phr of an aminoplast polymer optimally modified by about 5-20 molar per cent of a polyamine.
Inventors
- 👤 R Dembowski
- 👤 T Schuh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:43
CPC Classifications
C; C08; C08L; C08L21/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A method of preparing a rubber stock selected from the group consisting of diene rubber and acrylate rubber and containing a non-reinforcing filler which comprises forming the stock into a dry mix and adding thereto 0.1 to 10 phr of an aminoplast polymer selected from a group consisting of polyamine modified, urea-formaldehyde, and melamine-formaldehyde compositions wherein the polyamine constituent is utilized in about 5-20 percent based upon the molar amine content of the aminoplast and subsequently uniformly blending, shaping and vulcanizing said mix.
Claim 2
Independent Claim
83 words
A method of preparing a rubber stock selected from the group consisting of diene rubber and acrylate rubber and containing a non-reinforcing filler which comprises forming the stock into a dry mix and adding thereto 0.1 to 10 phr of an aminoplast polymer selected from a group consisting of polyamine modified, urea-formaldehyde, and melamine-formaldehyde compositions wherein the polyamine constituent is utilized in about 5-20 percent based upon the molar amine content of the aminoplast and subsequently uniformly blending, shaping and vulcanizing said mix.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein about 2 to 4 phr of an aminoplast polymer is added.
Claim 4
Dependent Claim
69 words
A rubber-bridging composition suitable for vulcanizing which comprises as essential ingredients a dry mix of a rubber selected from a group consisting of diene rubbers and acrylate rubbers, a non-reinforcing rubber filler and about 0.1 to 10 phr of an aminoplast polymer selected from polyamine modified, urea- and melamine-formaldehyde polymers wherein the polyamine constituent is present in about 5-20 percent based upon the molar amine content of the aminoplast.
Claim 5
Dependent Claim
69 words
A rubber-bridging composition suitable for vulcanizing which comprises as essential ingredients a dry mix of a rubber selected from a group consisting of diene rubbers and acrylate rubbers, a non-reinforcing rubber filler and about 0.1 to 10 phr of an aminoplast polymer selected from polyamine modified, urea- and melamine-formaldehyde polymers wherein the polyamine constituent is present in about 5-20 percent based upon the molar amine content of the aminoplast.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |