Patent US3656208A successfully refreshed from Google Patents.
Patent US3652499A successfully refreshed from Google Patents.
US4408010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyblend of styrene copolymers and molded article produced therefrom
Assignee: Lyondell Chemical Technology LP
•
Filing: 1982-10-04
•
Granted: 1983-10-04
•
Expires: 2002-10-04
Abstract
Abstract The use of a styrenic copolymer of maleimide to improve the heat resistant properties of styrene/maleic anhydride copolymers is disclosed.
Inventors
- 👤 Bi Le-Khac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:24
CPC Classifications
C; C08; C08L; C08L35/00; C08L35/06; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
A polyblend comprising a first and a second copolymer, the first copolymer consisting essentially of an α, β ethylenically unsaturated dicarboxylic acid or its anhydride copolymerized with at least one monovinyl-substituted aryl hydrocarbon monomer and, the second copolymer consisting essentially of maleimide copolymerized with at least one monovinyl substituted aryl hydrocarbon monomer and being present in the polyblend in an amount effective to increase the heat resistant properties of the first copolymer.
Claim 2
Dependent Claim
72 words
A polyblend comprising a first and a second copolymer, the first copolymer consisting essentially of an α, β ethylenically unsaturated dicarboxylic acid or its anhydride copolymerized with at least one monovinyl-substituted aryl hydrocarbon monomer and, the second copolymer consisting essentially of maleimide copolymerized with at least one monovinyl substituted aryl hydrocarbon monomer and being present in the polyblend in an amount effective to increase the heat resistant properties of the first copolymer.
Claim 3
Dependent Claim
43 words
The polyblend of claim 1 in which said first copolymer is a non-equimolar copolymer containing less than 50 mole percent of an α, β ethylenically unsaturated dicarboxylic acid or its anhydride and more than 50 mole percent of a monovinyl-substituted aryl hydrocarbon monomer.
Claim 4
Dependent Claim
13 words
The polyblend of claim 2 in which said first copolymer is styrene/maleic anhydride.
Claim 5
Dependent Claim
13 words
The polyblend of claim 2 in which said first copolymer is impact modified.
Claim 6
Dependent Claim
13 words
The polyblend of claim 4 in which said impact modifier is a rubber.
Claim 7
Dependent Claim
12 words
The polyblend of claim 1 in which said second copolymer is maleimide/styrene.
Claim 8
Dependent Claim
12 words
The polyblend of claim 1 in the form of a molded article.
Claim 9
Independent Claim
69 words
A method for increasing the heat resistant properties of a copolymer of an α, β ethylenically unsaturated dicarboxylic acid or its anhydride with at least one monovinyl-substituted aryl hydrocarbon monomer, which method comprises forming a polyblend by mixing the first copolymer with an effective amount of a second copolymer of maleimide with a least one monovinyl-substituted aryl hydrocarbon monomer, to increase the heat resistant properties of the first copolymer.
Claim 10
Independent Claim
69 words
A method for increasing the heat resistant properties of a copolymer of an α, β ethylenically unsaturated dicarboxylic acid or its anhydride with at least one monovinyl-substituted aryl hydrocarbon monomer, which method comprises forming a polyblend by mixing the first copolymer with an effective amount of a second copolymer of maleimide with a least one monovinyl-substituted aryl hydrocarbon monomer, to increase the heat resistant properties of the first copolymer.
References Cited (Backward Citations)
US3652726A
Cited
US3642949A
Cited
US3998907A
Cited
US4129619A
Cited
US4339554A
Cited
US4374951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |