Patent EP0084882A1 successfully refreshed from Google Patents.
EP0084882A1
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Method for the preparation of stabilized polystyrene
Assignee: GE Chemicals Inc
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Filing: 1983-01-24
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Granted: —
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Expires: 2003-01-24
Abstract
Abstract Styrenic resins, and particularly rubber-modified styrenic resins, are usefully stabilized when melt processed in mixtures with a stabilizer containing a mercaptan group and as a recation promotor, a free radical initiator. The process grafts the stabilizer to the styrenic resin, thus preventing subsequent loss of stabilizer by leaching or migration.
Inventors
- 👤 Zenon Joffe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08F; C08F8/00; C08F8/34; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
31 words
Stabilized thermoplastics obtainable by mixing a thermoplastic resin, a stabilizing amount of at least one mercaptan group-containing stabilizer having the structure R-SH, and a reaction promoter, and melt processing said mixture.
Claim 2
Dependent Claim
31 words
Stabilized thermoplastics obtainable by mixing a thermoplastic resin, a stabilizing amount of at least one mercaptan group-containing stabilizer having the structure R-SH, and a reaction promoter, and melt processing said mixture.
Claim 3
Dependent Claim
46 words
. A method for stabilizing thermoplastics as set forth in Claim 1 comprising the steps of: providing a mixture of a thermoplastic resin, a stabilizing amount of at least one mercaptan group-containing stabilizer having the structure R-SH, and a reaction promoter; and melt processing said mixture.
Claim 4
Independent Claim
64 words
A method for stabilizing thermoplastics comprising the steps of: providing a mixture of a thermoplastic resin, at least one mercaptan group-containing stabilizer having the structure R-SH wherein R is an aralkylene radical selected from the group consisting of hydroxyphenylalkylene radicals, benzoylphenylalkylene radicals and hydroxy-(benzoylphenyl) alkylene radicals, and a reaction promoter selected from the group consisting of peroxides and hydroperoxides; and melt processing said mixture.
Claim 5
Independent Claim
64 words
A method for stabilizing thermoplastics comprising the steps of: providing a mixture of a thermoplastic resin, at least one mercaptan group-containing stabilizer having the structure R-SH wherein R is an aralkylene radical selected from the group consisting of hydroxyphenylalkylene radicals, benzoylphenylalkylene radicals and hydroxy-(benzoylphenyl) alkylene radicals, and a reaction promoter selected from the group consisting of peroxides and hydroperoxides; and melt processing said mixture.
Claim 6
Dependent Claim
13 words
The method of Claim 3 wherein said thermoplastic resin is a styrenic resin.
Claim 7
Dependent Claim
16 words
5 . The method of Claim 3 wherein said thermoplastic resin is a rubber-modified styrenic resin.
Claim 8
Dependent Claim
27 words
6 . The method of Claim 3 wherein said stabilizer is a compound selected from the group consisting of hydroxyphenylalkylene mercaptans and mercaptoalkyl esters of hydroxyalkylated hydroxybenzophenones.
Claim 9
Independent Claim
80 words
A method for stabilizing thermoplastics comprising the steps of: providing a mixture of a rubber modified styrenic resin selected from the group consisting of high impact polystyrene, graft acrylonitrile-butadiene-styrene resins and graft methyl methacrylate-butadiene-styrene resins; a stabilizing amount of at least one stabilizer selected from the group consisting of a 4-hydroxy-2,6-di-t-butylphenylmethyl mercaptan, 2-(3-hydroxy-4-(benzoyl)-phenoxy)ethyl-3 mercapto propionate and 2-(3-hydroxy-4-(benzoyl) phenoxy)ethyl-2-mercapto acetate; and a reaction promoter selected fom the group consisting of dicumyl peroxide, cumene hydroperoxide and 3,3,6,6,9,9-hexamethyl-1,2,4,5-tetraoxocyclononan; and melt processing said mixture.
Claim 10
Independent Claim
80 words
A method for stabilizing thermoplastics comprising the steps of: providing a mixture of a rubber modified styrenic resin selected from the group consisting of high impact polystyrene, graft acrylonitrile-butadiene-styrene resins and graft methyl methacrylate-butadiene-styrene resins; a stabilizing amount of at least one stabilizer selected from the group consisting of a 4-hydroxy-2,6-di-t-butylphenylmethyl mercaptan, 2-(3-hydroxy-4-(benzoyl)-phenoxy)ethyl-3 mercapto propionate and 2-(3-hydroxy-4-(benzoyl) phenoxy)ethyl-2-mercapto acetate; and a reaction promoter selected fom the group consisting of dicumyl peroxide, cumene hydroperoxide and 3,3,6,6,9,9-hexamethyl-1,2,4,5-tetraoxocyclononan; and melt processing said mixture.
Claim 11
Dependent Claim
30 words
The method of Claim 7 wherein said mixture comprises from 0.1 to about 2 wt.% of said stabilizer and from about 0.01 to about 1.0 wt.% of said reaction promoter.
Claim 12
Independent Claim
36 words
The method of Claim ? wherein said melt processing is carried out at a temperature in the range of from about 140 to 250°C and for a period of from about 1 to about 30 min.
References Cited (Backward Citations)
DE2509654A1
Cited
EP0035472A1
Cited
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