US3914339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing rubber-modified plastics
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1973-07-23
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Granted: 1975-10-21
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Expires: 1993-07-23
Abstract
Abstract A process for producing rubber-modified plastics excellent in impact strength and color rendering which comprises dissolving rubber into a mixture of acrylonitrile and styrene containing or not one or more of other vinyl monomers copolymerizable with them, subjecting the resultant solution to bulk polymerization under heating without using any polymerization initiator until the total conversion of the vinyl monomers reaches to a range of 3.5 to 15% by weight, adding a chain transfer agent to the resulting reaction mixture, continuing the bulk polymerization until the total conversion of the vinyl monomers reaches to a range of 20 to 40% by weight and subjecting the thus prepared prepolymer to suspension polymerization in the presence of lauroyl peroxide as a polymerization initiator.
Inventors
- 👤 Takesaburo Shima
- 👤 Sukehiko Sakamoto
- 👤 Yoshikazu Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:56
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F279/00; C08F279/02; C08F291/00; C08F291/02
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
109 words
A PROCESS FOR PRODUCING RUBBER-MODIFIED PLASTICS EXCELLENT IN IMPACT STRENGTH AND COLOR RENDERING WHICH COMPRISES DISSOLVING RUBBER INTO A MIXTURE OF VINYL MONOMERS CONTAINING ACRYLONITRILE AND STYRENE, SUBJECTING THE RESULTANT SOLUTION TO BULK POLYMERIZATION UNDER HEATING WITHOUT USING ANY POLYMERIZATION INITIATOR UNTIL THE TOTAL CONVERSION OF THE VINYL MONOMERS REACHES A RANGE OF 3.5 TO 15% BY WEIGHT, ADDING A CHAIN TRANSFER AGENT TO THE RESULTING REACTION MIXTURE, CONTINUING THE BULK POLYMERIZATION UNTIL THE TOTAL CONVERSION OF THE VINYL MONOMERS REACHES A RAGE OF 20 TO 40 % BY WEIGHT, AND SUBJECTING THE THUS PREPARED PREPOLYMER TO SUSPENSION POLYMERIZATION IN THE PRESENCE OF LAUROYL PEROXIDE AS A POLYMERIZATION INITIATOR.
Claim 2
Dependent Claim
109 words
A PROCESS FOR PRODUCING RUBBER-MODIFIED PLASTICS EXCELLENT IN IMPACT STRENGTH AND COLOR RENDERING WHICH COMPRISES DISSOLVING RUBBER INTO A MIXTURE OF VINYL MONOMERS CONTAINING ACRYLONITRILE AND STYRENE, SUBJECTING THE RESULTANT SOLUTION TO BULK POLYMERIZATION UNDER HEATING WITHOUT USING ANY POLYMERIZATION INITIATOR UNTIL THE TOTAL CONVERSION OF THE VINYL MONOMERS REACHES A RANGE OF 3.5 TO 15% BY WEIGHT, ADDING A CHAIN TRANSFER AGENT TO THE RESULTING REACTION MIXTURE, CONTINUING THE BULK POLYMERIZATION UNTIL THE TOTAL CONVERSION OF THE VINYL MONOMERS REACHES A RAGE OF 20 TO 40 % BY WEIGHT, AND SUBJECTING THE THUS PREPARED PREPOLYMER TO SUSPENSION POLYMERIZATION IN THE PRESENCE OF LAUROYL PEROXIDE AS A POLYMERIZATION INITIATOR.
Claim 3
Dependent Claim
25 words
The process according to claim 1, wherein the rubber is polybutadiene, polyisoprene, styrene-butadiene copolymer, chlorinated polyethylene, ethylene-vinyl acetate copolymer, ethylene-propylene-diene monomer terpolymer or nitrile rubber.
Claim 4
Dependent Claim
30 words
The process according to claim 1, wherein the rubber is used in an amount of 2 to 20 parts by weight per 100 parts by weight of the vinyl monomers.
Claim 5
Dependent Claim
24 words
The process according to claim 1, wherein the proportion of acrylonitrile to styrene is from 15 : 85 to 40 : 60 by weight.
Claim 6
Dependent Claim
31 words
The process according to claim 1, wherein said mixture of vinyl monomers further contains at least one other vinyl monomer selected from the group consisting of Alpha -methylstyrene, dimethylstyrene and chlorostyrene.
Claim 7
Dependent Claim
36 words
The process according to claim 5, wherein the other vinyl monomers are used in an amount of 0 to 15 parts by weight per 100 parts by weight of the combined amount of acrylonitrile and styrene.
Claim 8
Dependent Claim
18 words
The process according to claim 1, wherein the bulk polymerization is effected under heating at 85* to 130*C.
Claim 9
Dependent Claim
20 words
The process according to claim 1, wherein the chain transfer agent is a mercaptan having 4 to 16 carbon atoms.
Claim 10
Dependent Claim
36 words
The process according to claim 8, wherein the chain transfer agent is used in an amount of 0.05 to 0.6 % by weight on the basis of the total amount of the vinyl in said mixture.
Claim 11
Dependent Claim
31 words
The process according to claim 1, wherein the amount of lauroyl peroxide is from 0.4 to 3.0 % by weight on the basis of the total amount of the vinyl monomers.
Claim 12
Dependent Claim
21 words
The process according to claim 1, wherein the suspension polymerization is carried out in an aqueous medium containing a suspending agent.
Claim 13
Dependent Claim
17 words
The process according to claim 11, wherein the aqueous medium further contains a water phase polymerization inhibitor.
Claim 14
Dependent Claim
19 words
The process according to claim 1, wherein the suspension polymerization is effected at a temperature from 60* to 120*C.
Claim 15
Dependent Claim
40 words
The process according to claim 1, wherein said rubber is one which shows a rubbery state at room temperature and is reacted with a radical produced by the action of heat or a radical initiator to participate in graft polymerization.
Claim 16
Dependent Claim
18 words
The process according to claim 1, wherein said rubber is polybutadiene and said mixture contains acrylonitrile and styrene.
Claim 17
Dependent Claim
14 words
The process according to claim 15, wherein said mixture contains Alpha -methylstyrene or dimethylstyrene.
Claim 18
Dependent Claim
20 words
The process according to claim 1, wherein the rubber is a styrene-butadiene copolymer and the mixture contains acrylonitrile and styrene.
Claim 19
Dependent Claim
14 words
The process according tO claim 17, wherein said mixture contains Alpha -methylstyrene or dimethylstyrene.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |