US4374951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyblends comprising N-phenylmaleimide copolymers and SAN copolymers
Assignee: Monsanto Co
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Filing: 1981-09-11
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Granted: 1983-02-22
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Expires: 2001-09-11
Abstract
Abstract Polyblends of N-phenyl maleimide copolymers and SAN copolymers within certain imide and acrylonitrile content ranges are found to have unique compatibility properties not displayed by related copolymer blends.
Inventors
- 👤 Yoon C. Lee, deceased
- 👤 Gary L. Deets
- 👤 Quirino A. Trementozzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:44
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/12; C08L35/00; C08L35/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A polyblend comprising: A. a copolymer having from 40 to 55% by weight of N-phenyl maleimide, from 0 to 10% by weight of acrylonitrile and from 35 to 60% by weight of a vinylaromatic monomer; and B. a copolymer of a vinyl aromatic monomer and from 20 to 40% by weight of acrylonitrile.
Claim 2
Dependent Claim
53 words
A polyblend comprising: A. a copolymer having from 40 to 55% by weight of N-phenyl maleimide, from 0 to 10% by weight of acrylonitrile and from 35 to 60% by weight of a vinylaromatic monomer; and B. a copolymer of a vinyl aromatic monomer and from 20 to 40% by weight of acrylonitrile.
Claim 3
Dependent Claim
24 words
A polyblend according to claim 1 which also comprises dispersed particles of a rubber grafted with the monomers providing the copolymer of component A.
Claim 4
Dependent Claim
24 words
A polyblend according to claim 1 which also comprises dispersed particles of a rubber grafted with the monomers providing the copolymer of component B.
Claim 5
Dependent Claim
26 words
A polyblend according to any one of claims 1 to 3 which comprises components A and B in a weight ratio of from 10:1 to 1:10.
Claim 6
Dependent Claim
23 words
A polyblend according to any one of claims 1 to 3 in which component A has an inherent viscosity of at least 0.3.
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) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |