US3720734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pvc compositions containing carboxylic acid anhydride copolymers
Assignee: Stauffer Chemical Co
•
Filing: 1971-04-15
•
Granted: 1973-03-13
•
Expires: 1991-04-15
Abstract
Abstract A polymeric composition consisting essentially of a solid polymer selected from vinyl chloride homopolymers having increased impact strength by adding thereto a responsive amount of copolymers of unsaturated carboxylic acid anhydrides.
Inventors
- 👤 A Kopacki
- 👤 J Deatcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:19
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L35/00; C08L35/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
A solid polymeric composition characterized by an improvement in the impact strength of the end product comprising a vinyl chloride homopolymer and a copolymer of an alkyl vinyl ether and an unsaturated carboxylic acid anhydride selected from the group consisting of maleic, citraconic, aconitic, and itaconic, the copolymer being present in the amount of between at least 0.1 percent and about 5.0 percent, by weight, of said vinyl chloride homopolymer.
Claim 2
Dependent Claim
70 words
A solid polymeric composition characterized by an improvement in the impact strength of the end product comprising a vinyl chloride homopolymer and a copolymer of an alkyl vinyl ether and an unsaturated carboxylic acid anhydride selected from the group consisting of maleic, citraconic, aconitic, and itaconic, the copolymer being present in the amount of between at least 0.1 percent and about 5.0 percent, by weight, of said vinyl chloride homopolymer.
Claim 3
Dependent Claim
23 words
The composition according to claim 1 wherein the alkyl radical of the vinyl ether component can have from one to 25 carbon atoms.
Claim 4
Dependent Claim
27 words
The composition according to claim 1 wherein the alkyl radical of the vinyl ether component can be selected from a group consisting of methyl, isobutyl, and octadecyl.
Claim 5
Dependent Claim
18 words
The solid polymeric composition as recited in claim 1 wherein said unsaturated carboxylic acid anhydride is maleic anhydride.
Claim 6
Independent Claim
82 words
A method for improving the impact strength of a solid polyvinyl chloride thermoplastic article comprising admixing from about 0.1 percent to about 5 percent by weight, based on the weight of the polyvinyl chloride, of an impact modifier to said polyvinyl chloride prior to forming the said polyvinyl chloride into said solid article, said impact modifier being a copolymer of alkyl vinyl ether and an unsaturated carboxylic acid anhydride selected from the group consisting of maleic, citraconic, aconitic, itaconic, and mixtures thereof.
Claim 7
Independent Claim
82 words
A method for improving the impact strength of a solid polyvinyl chloride thermoplastic article comprising admixing from about 0.1 percent to about 5 percent by weight, based on the weight of the polyvinyl chloride, of an impact modifier to said polyvinyl chloride prior to forming the said polyvinyl chloride into said solid article, said impact modifier being a copolymer of alkyl vinyl ether and an unsaturated carboxylic acid anhydride selected from the group consisting of maleic, citraconic, aconitic, itaconic, and mixtures thereof.
Claim 8
Dependent Claim
16 words
The method as recited in claim 5 wherein said unsaturated carboxylic acid anhydride is maleic anhydride.
Claim 9
Dependent Claim
21 words
The method as recited in claim 5 wherein a barium cadmium organic soap heat stabilizer is also added during said admixing.
Claim 10
Dependent Claim
24 words
The method as recited in claim 5 wherein the alkyl radical of the vinyl ether component can have from one to 25 carbon atoms.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |