Title:
METHOD FOR PRODUCING EXPANDED OR EXPANDABLE POLYOLEFIN PARTICLES
Document Type and Number:
WIPO Patent Application WO2001077213
Kind Code:
A3
Abstract:
The invention relates to a method for producing expanded or expandable polyolefin particles, by impregnating polyolefin granulate with a volatile propellant in suspension under pressure. A mixture of a water-insoluble inorganic compound and a surfactant is used as a suspending auxiliary agent and the impregnation takes place in the presence of a surface-active polymer which carries carboxyl or carboxylate groups.
Inventors:
BRAUN FRANK (DE)
Application Number:
PCT/EP2001/003591
Publication Date:
March 14, 2002
Filing Date:
March 29, 2001
Export Citation:
Assignee:
BASF AG (DE)
BRAUN FRANK (DE)
BRAUN FRANK (DE)
International Classes:
C08J9/18; C08J9/224; (IPC1-7): C08J9/18; C08J9/224
Other References:
DATABASE WPI Section Ch Week 199925, Derwent World Patents Index; Class A14, AN 1999-296580, XP002172327
DATABASE WPI Section Ch Week 198802, Derwent World Patents Index; Class A17, AN 1988-010455, XP002172328
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 09 30 September 1996 (1996-09-30)
PATENT ABSTRACTS OF JAPAN vol. 018, no. 430 (C - 1236) 11 August 1994 (1994-08-11)
DATABASE WPI Section Ch Week 198802, Derwent World Patents Index; Class A17, AN 1988-010455, XP002172328
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 09 30 September 1996 (1996-09-30)
PATENT ABSTRACTS OF JAPAN vol. 018, no. 430 (C - 1236) 11 August 1994 (1994-08-11)
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