EP 0719298 A1 19960703 - PEARL-SHAPED, EXPANDABLE STYRENE POLYMERS CONTAINING STERICALLY HINHIBITED PHENOLS
Title (en)
PEARL-SHAPED, EXPANDABLE STYRENE POLYMERS CONTAINING STERICALLY HINHIBITED PHENOLS
Title (de)
PERLFORMIGE, EXPANDIERBARE STYROLPOLYMERISATE, ENTHALTEND STERISCH GEHINDERTE PHENOLE
Title (fr)
POLYMERES EXPANSIBLES DE STYRENE EN PERLES CONTENANT DES PHENOLS STERIQUEMENT INHIBES
Publication
Application
Priority
- DE 4331808 A 19930918
- EP 9402987 W 19940907
Abstract (en)
[origin: CA2171867A1] Pearl-shaped, expandable styrene polymers contain (a) a styrene polymer; (b) 0.03 to 1.5 % by weight, in relation to (a), of a sterically inhibited phenol homogenously distributed in the styrene polymer and/or applied as a coating on the surface of the styrene polymer; (c) an expanding agent or mixture of expanding agents; and if required (d) effective amounts of usual additives. Also disclosed is a process for producing said polymers, according to which styrene, if required with other comonomers, is polymerised in an aqueous suspension in the presence of suspension stabilisers and usual styrene-soluble polymerisation catalysts, with addition of an expanding agent or mixture of expanding agents, and if required of an effective amount of usual additives and of up to 1.5 % by weight, in relation to styrene and comonomers, of sterically hindered phenols. The thus obtained pearl-shaped, expandable styrene polymers are coated with up to 1.5 % by weight, in relation to the expanding agent-free styrene polymer, of sterically inhibited phenols, provided that the expandable styrene polymers that are homogenously distributed in the styrene polymer and/or applied as a surface coating contain in total 0.03 to 1.5 % by weight of sterically inhibited phenols, in relation to the styrene polymer.
IPC 1-7
IPC 8 full level
C08J 9/16 (2006.01); C08F 2/18 (2006.01); C08F 2/44 (2006.01); C08J 9/20 (2006.01); C08K 5/134 (2006.01)
CPC (source: EP KR)
C08J 9/00 (2013.01 - KR); C08J 9/16 (2013.01 - KR); C08J 9/20 (2013.01 - EP); C08J 9/224 (2013.01 - KR); C08K 5/1345 (2013.01 - EP); C08J 2325/04 (2013.01 - EP)
Citation (search report)
See references of WO 9508589A1
Designated contracting state (EPC)
AT BE DE ES FR GB IT NL SE
DOCDB simple family (publication)
DE 4331808 A1 19950323; AU 7694994 A 19950410; CA 2171867 A1 19950330; EP 0719298 A1 19960703; JP H09504814 A 19970513; KR 960704968 A 19961009; WO 9508589 A1 19950330
DOCDB simple family (application)
DE 4331808 A 19930918; AU 7694994 A 19940907; CA 2171867 A 19940907; EP 9402987 W 19940907; EP 94927578 A 19940907; JP 50952894 A 19940907; KR 19960701394 A 19960318