Document Type and Number:
Japanese Patent JPS5141089
Kind Code:
A
Abstract:
1484096 Graft polymerization process MONSANTO CO 4 Aug 1975 [5 Aug 1974] 32504/75 Heading C3G A polymer blend is produced by a process which comprises (a) dissolving a rubbery polymer, other than an ethylene-propylene-non- conjugated diene terpolymer, in a monomer formulation comprising at least one monovinylidene aromatic monomer; (b) bulk polymerizing the solution from (a), at a temperature of from 95 to 125 C. with agitation and in the presence of a peroxide catalyst with a half-life of less than one hour at 130 C. and often hours at a temperature from 95 to 115 C., to a partially polymerized mixture having a conversion of 10 to 45%; (c) suspending the partially polymerized mixture in an inert liquid; (d) suspension polymerizing the said mixture at a temperature of from 110 to 150 C. in the presence of a peroxide catalyst with a half-life of less than one hour at 130 C. and of ten hours at a temperature of from 95 to 130 C., the partially polymerized mixture having an essentially complete conversion to a polymer blend; and (e) recovering the polymer blend from the suspension. Examples are given in which polybutadiene is grafted with styrene using tert.-butyl perbenzoate as catalyst in stages (b) and (d), or tert.-butyl peracetate in stage (b) and tert.- butyl perbenzoate in stage (d). The graft polymers produced are blended with polystyrene.
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Inventors:
NOOMAN ROOSON HAADOITSUKU
Application Number:
JP9494075A
Publication Date:
April 06, 1976
Filing Date:
August 04, 1975
Export Citation:
Assignee:
MONSANTO CO
International Classes:
C08F2/00; C08F2/18; C08F279/00; C08F291/02; (IPC1-7): C08F4/32; C08F279/02
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