US4294946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low residual monomer α-methylstyrene-acrylonitrile copolymers and ABS blends therefrom
Assignee: Sumika Polycarbonate Ltd
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Filing: 1980-07-21
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Granted: 1981-10-13
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Expires: 2000-07-21
Abstract
Abstract A process for preparing a thermoplastic resin having high heat resistance by emulsion polymerization of an α-alkylstyrene compound of the formula: ##STR1## wherein R 1 is C 1 -C 3 alkyl and R 2 is hydrogen, C 1 -C 3 alkyl or halo(C 1 -C 3 )alkyl and an unsaturated nitrile in a weight proportion of 65:35 to 80:20 in the presence of a radical initiator, characterized in that the whole amount of the α-alkylstyrene compound and 10 to 99% by weight of the unsaturated nitrile on the basis of its total amount are first subjected to polymerization and, after the polymerization, the remaining portion of the unsaturated nitrile is added to the reaction mixture and the resultant mixture is subjected to further polymerization until the polymerization is substantially completed.
Inventors
- 👤 Hiroyuki Minematsu
- 👤 Kojiro Matsumoto
- 👤 Tadashi Saeki
- 👤 Akira Kishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:05
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12; C08F257/00; C08F257/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A process for preparing a thermoplastic resin having high heat resistance by emulsion polymerization of a monomer mixture consisting essentially of α-alkylstyrene compound of the formula: ##STR3## wherein R 1 is C 1 -C 3 alkyl and R 2 is hydrogen, C 1 -C 3 alkyl or halo(C 1 -C 3 )alkyl and an unsaturated nitrile in a weight proportion of 65:35 to 80:20 in the presence of a radical initiator, characterized in that the whole amount of the α-alkylstyrene compound and 10 to 99% by weight of the unsaturated nitrile on the basis of its total amount are first subjected to polymerization and, after the polymerization, the remaining portion of the unsaturated nitrile is added to the reaction mixture and the resultant mixture is subjected to further polymerization until the polymerization is substantially completed.
Claim 2
Dependent Claim
135 words
A process for preparing a thermoplastic resin having high heat resistance by emulsion polymerization of a monomer mixture consisting essentially of α-alkylstyrene compound of the formula: ##STR3## wherein R 1 is C 1 -C 3 alkyl and R 2 is hydrogen, C 1 -C 3 alkyl or halo(C 1 -C 3 )alkyl and an unsaturated nitrile in a weight proportion of 65:35 to 80:20 in the presence of a radical initiator, characterized in that the whole amount of the α-alkylstyrene compound and 10 to 99% by weight of the unsaturated nitrile on the basis of its total amount are first subjected to polymerization and, after the polymerization, the remaining portion of the unsaturated nitrile is added to the reaction mixture and the resultant mixture is subjected to further polymerization until the polymerization is substantially completed.
Claim 3
Dependent Claim
38 words
The process according to claim 1, wherein the amount of the unsaturated nitrile to be used for the first polymerization is from 20 to 95% by weight on the basis of the total amount of the unsaturated nitrile.
Claim 4
Dependent Claim
38 words
The process according to claim 1, wherein the amount of the unsaturated nitrile to be used for the first polymerization is from 2.5 to 50% by weight on the basis of the whole amount of the α-alkylstyrene compound.
Claim 5
Dependent Claim
38 words
The process according to claim 3, wherein the amount of the unsaturated nitrile to be used for the first polymerization is from 10 to 40% by weight on the basis of the whole amount of the α-alkylstyrene compound.
Claim 6
Dependent Claim
12 words
The process according to claim 1, wherein the α-alkylstyrene compound is α-methylstyrene.
Claim 7
Dependent Claim
12 words
The process according to claim 1, wherein the unsaturated nitrile is acrylonitrile.
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) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |