US3715172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea- and melamine- formaldehyde bridging agents
Assignee: ChampionX LLC
•
Filing: 1971-01-12
•
Granted: 1973-02-06
•
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 15:38
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.
References Cited (Backward Citations)
US2500517A
Cited
US2563897A
Cited
GB741646A
Cited
US2916471A
Cited
US3003990A
Cited
US3522127A
Cited
FR1422099A
Cited
US3509098A
Cited
US3219600A
Cited
FR1453750A
Cited
US3405079A
Cited
US3440184A
Cited
US3410649A
Cited
US3553115A
Cited
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 |