US3956246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of impact-resistant olefinic-nitrile copolymers
Assignee: Standard Oil Co
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Filing: 1972-05-04
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Granted: 1976-05-11
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Expires: 1992-05-04
Abstract
Abstract Impact-resistant polymers, which have low permeability to gases and vapors, are prepared by polymerizing methacrylonitrile with styrene to at least about 70% conversion and then introducing into the polymerization reaction medium a conjugated diene monomer, such as butadiene-1,3 and optionally styrene or methacrylonitrile, and completing the polymerization reaction.
Inventors
- 👤 Russell K. Griffith
- 👤 John F. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:37
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
The process comprising polymerising in an aqueous medium in the substantial absence of oxygen at a temperature in the range of from about 0° to 100°C to at least 70% by weight conversion of 100 parts by weight of a monomer component comprising A. from about 70 to 95% by weight of methacrylonitrile and B. from about 5 to 30% by weight based on the combined weights of (A) plus (B) of styrene and then including in the polymerization from 1 to 40 parts by weight per 100 parts by weight of (A) plus (B) of C. from about 70 to 100% by weight of at least one conjugated diene monomer selected from the group consisting of butadiene-1,3 and isoprene and D. from about 0 to 30% by weight based on the combined weights of (C) plus (D) of at least one member selected from the group consisting of styrene and methacrylonitrile and continuing the polymerization to a final conversion of from about 80 to 100% by weight of monomers to polymer.
Claim 2
Dependent Claim
172 words
The process comprising polymerising in an aqueous medium in the substantial absence of oxygen at a temperature in the range of from about 0° to 100°C to at least 70% by weight conversion of 100 parts by weight of a monomer component comprising A. from about 70 to 95% by weight of methacrylonitrile and B. from about 5 to 30% by weight based on the combined weights of (A) plus (B) of styrene and then including in the polymerization from 1 to 40 parts by weight per 100 parts by weight of (A) plus (B) of C. from about 70 to 100% by weight of at least one conjugated diene monomer selected from the group consisting of butadiene-1,3 and isoprene and D. from about 0 to 30% by weight based on the combined weights of (C) plus (D) of at least one member selected from the group consisting of styrene and methacrylonitrile and continuing the polymerization to a final conversion of from about 80 to 100% by weight of monomers to polymer.
Claim 3
Dependent Claim
11 words
The process of claim 1 carried out in an aqueous emulsion.
Claim 4
Dependent Claim
32 words
The process of claim 2 wherein the polymerization of monomer component (A) plus (B) is carried out to at least 80% by weight conversion before monomer component (C) plus (D) is included.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein monomer component (D) is styrene.
Claim 6
Dependent Claim
11 words
The process of claim 3 wherein monomer component (D) is methacrylonitrile.
Claim 7
Dependent Claim
13 words
The process of claim 3 wherein monomer component (D) is styrene and methacrylonitrile.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein there is included in the polymerization from 1 to 20 parts by weight of (C) and (D).
References Cited (Backward Citations)
US3168593A
Cited
US3442981A
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US3538194A
Cited
US3615710A
Cited
US3676527A
Cited
US3742092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |