US3935153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing styrene resins containing polyester plasticizers
Assignee: Daicel Corp
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Filing: 1975-04-10
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Granted: 1976-01-27
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Expires: 1995-04-10
Abstract
Abstract Molding compositions having improved properties for low-pressure, low-shear molding techniques are prepared by carrying out a two-stage polymerization of an initial mixture comprising a polymerizable monomer selected from the group consisting of (1) a polymerizable aromatic monoalkenyl monomer or (2) a mixture of such aromatic monoalkenyl monomer with another polymerizable monovinyl monomer; in the presence of a butadiene rubber elastomer under bulk polymerization conditions, followed by suspension polymerization conditions; the process being characterized by the incorporation into the initial mixture of 1 to 10 wt. %, based on the polymerizable monomers, of a straight chain saturated polyester having an average molecular weight of 1,000 to 50,000.
Inventors
- 👤 Teizo Kudo
- 👤 Yoshio Hashizume
- 👤 Masatoshi Mikumo
- 👤 Masanori Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:07
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
In a method for producing a molding composition suitable for use in low-pressure low-shear molding techniques, which comprises carrying out a bulk-suspension two-stage polymerization of (A) monomer selected from the group consisting of (1) an aromatic monoalkenyl monomer and (2) a mixture of said aromatic monoalkenyl monomer with another monovinyl monomer, in the presence of (B) a butadiene rubber elastomer, the improvement which comprises incorporating in the polymerization mixture before the bulk polymerization stage, (C) from 1 to 10 wt. %, based on said monomer component (A), of a straight chain saturated polyester having an average molecular weight of 1000 to 50,000, said straight chain saturated polyester being selected from the group consisting of polyesters obtained by the condensation reaction of dibasic acids having up to 10 carbon atoms with alkylene glycols having 2 to 6 carbon atoms, and polyesters prepared by the ring-opening-polymerization of lactones of hydroxyalkanoic acids having up to 12 carbon atoms in the alkyl group.
Claim 2
Dependent Claim
159 words
In a method for producing a molding composition suitable for use in low-pressure low-shear molding techniques, which comprises carrying out a bulk-suspension two-stage polymerization of (A) monomer selected from the group consisting of (1) an aromatic monoalkenyl monomer and (2) a mixture of said aromatic monoalkenyl monomer with another monovinyl monomer, in the presence of (B) a butadiene rubber elastomer, the improvement which comprises incorporating in the polymerization mixture before the bulk polymerization stage, (C) from 1 to 10 wt. %, based on said monomer component (A), of a straight chain saturated polyester having an average molecular weight of 1000 to 50,000, said straight chain saturated polyester being selected from the group consisting of polyesters obtained by the condensation reaction of dibasic acids having up to 10 carbon atoms with alkylene glycols having 2 to 6 carbon atoms, and polyesters prepared by the ring-opening-polymerization of lactones of hydroxyalkanoic acids having up to 12 carbon atoms in the alkyl group.
Claim 3
Dependent Claim
58 words
The process of claim 1, in which the monoalkenyl monomer is a member of the group consisting of styrene, α-methylstyrene, p-methylstyrene, and mixtures thereof, and the monovinyl monomer is a member of the group consisting of acrylonitrile, methacrylonitrile, acrylic acid esters and methacrylic acid esters of aliphatic alcohols of 1 to 12 carbon atoms and of polyhalogenated phenols.
Claim 4
Dependent Claim
28 words
The method of claim 2, in which the bulk polymerization is carried out at 60°C to 100°C and the suspension polymerization is carried out at 60°C to 140°C.
Claim 5
Dependent Claim
24 words
The method of claim 3, in which the butadiene rubber elastomer is a member of the group consisting of polybutadiene and a butadiene/styrene copolymer.
Claim 6
Dependent Claim
19 words
The method of claim 4, in which the monoalkenyl monomer is styrene, and the other monovinyl monomer is acrylonitrile.
Claim 7
Dependent Claim
14 words
The method of claim 5, in which the straight chain saturated polyester is polycaprolactone.
Claim 8
Dependent Claim
21 words
The method of claim 5, in which the straight chain saturated polyester is a polyester of adipic acid and 1,3-butylene glycol.
Claim 9
Dependent Claim
16 words
The method of claim 5, in which the straight chain saturated polyester is modified polyethylene terephthalate.
Claim 10
Dependent Claim
35 words
The method of claim 1, in which the aromatic monoalkenyl monomers are contained in an amount of at least 30 % by weight in the mixture of said aromatic monoalkenyl monomers with another monovinyl monomers.
Claim 11
Dependent Claim
18 words
A novel molding composition suitable for low-pressure low-shear molding techniques, the product of the process of claim 1.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |