Patent FR940630A successfully refreshed from Google Patents.
Patent US4518742A successfully refreshed from Google Patents.
US4518742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic resin composition having toughness and high heat distortion resistance
Assignee: Techno UMG Co Ltd
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Filing: 1983-10-28
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Granted: 1985-05-21
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Expires: 2003-10-28
Abstract
Abstract A thermoplastic resin composition having excellent impact resistance, heat distortion resistance and processability which comprises an aromatic polycarbonate and a thermoplastic resin prepared by polymerizing a monomer mixture containing mainly acrylonitrile and styrene in the presence of a diene rubber, adding alpha -methylstyrene or a monomer mixture containing mainly alpha -methylstyrene to the system, and continuing the polymerization, while gradually adding acrylonitrile or a monomer mixture containing mainly acrylonitrile.
Inventors
- 👤 Eiichi Muramatsu
- 👤 Shigemi Matsumoto
- 👤 Fumiya Nagoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:43
CPC Classifications
C; C08; C08L; C08L51/00; C08L69/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A composition comprising (I) a thermoplastic resin and (II) an aromatic polycarbonate in a (I)/(II) ratio of 90/10 to 40/60 by weight, said resin (I) being prepared by polymerizing 95 to 70 parts by weight of monomers in the presence of 5 to 30 parts by weight of diene rubber by a process which comprises polymerizing 2 to 40 parts by weight of (A) a monomer mixture containing at least 70% by weight of acrylonitrile and styrene in an acrylonitrile/styrene ratio of 10/90 to 40/60 by weight in the presence of the diene rubber, adding 50 to 90 parts by weight of (B) α-methylstyrene or a monomer mixture containing at least 80% by weight of α-methylstyrene to the polymerization system, and gradually adding (C) acrylonitrile or a monomer mixture containing at least 70% by weight of acrylonitrile to the system, while carrying out the polymerization, the ratio of the total weight of α-methylstyrene contained in the monomers (B) and (C) to the total weight of acrylonitrile contained in the monomers (B) and (C) being from 90/10 to 65/35.
Claim 2
Dependent Claim
178 words
A composition comprising (I) a thermoplastic resin and (II) an aromatic polycarbonate in a (I)/(II) ratio of 90/10 to 40/60 by weight, said resin (I) being prepared by polymerizing 95 to 70 parts by weight of monomers in the presence of 5 to 30 parts by weight of diene rubber by a process which comprises polymerizing 2 to 40 parts by weight of (A) a monomer mixture containing at least 70% by weight of acrylonitrile and styrene in an acrylonitrile/styrene ratio of 10/90 to 40/60 by weight in the presence of the diene rubber, adding 50 to 90 parts by weight of (B) α-methylstyrene or a monomer mixture containing at least 80% by weight of α-methylstyrene to the polymerization system, and gradually adding (C) acrylonitrile or a monomer mixture containing at least 70% by weight of acrylonitrile to the system, while carrying out the polymerization, the ratio of the total weight of α-methylstyrene contained in the monomers (B) and (C) to the total weight of acrylonitrile contained in the monomers (B) and (C) being from 90/10 to 65/35.
Claim 3
Dependent Claim
23 words
The composition of claim 1, wherein the diene rubber is selected from the group consisting of butadiene rubber, styrene-butadiene rubber, and isoprene rubber.
Claim 4
Dependent Claim
48 words
The composition of claim 1, wherein during the period till the polymerization conversion of α-methystyrene reaches 40%, the monomer (C) is added to the polymerization system at a rate such that the ratio of α-methylstyrene to acrylonitrile present in the system is not less than 90/10 by weight.
References Cited (Backward Citations)
EP0051336A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |