PRODUCTION OF RUBBER-MODIFIED STYRENIC RESIN

Title:

PRODUCTION OF RUBBER-MODIFIED STYRENIC RESIN

Document Type and Number:

WIPO Patent Application WO/1990/010656

Kind Code:

A1

Abstract:

This invention relates to a method of producing a rubber-modified styrenic resin having an excellent impact resistance and containing rubber particles of a weight-mean particle diameter of 1.5 to 4 $g(m)m, which comprises: supplying continuously to a first reactor of complete mixing type a starting material comprising 100 parts by weight of a polymerization feed consisting of 98 to 88 % by weight of a styrenic monomer or a mixture thereof with a copolymerizable comonomer and 2 to 12 % by weight of a highly viscous rubbery polymer having a viscosity of 400 to 2,000 cP in a 5 wt.% solution thereof in styrene at 25°C, 0.01 to 0.2 parts by weight of an organic peroxide, and 0 to 30 parts by weight of an inert organic solvent; conducting prepolymerization in this reactor under a condition wherein rubber phase inversion does not occur as yet; supplying a continuously withdrawn prepolymerizate to a second reactor of complete mixing type; granulating the rubbery polymer in this reactor while keeping the conversion of the monomer(s) in the feed below 40 % by weight; and enhancing the conversion in the subsequent reactor(s).

Inventors:

HAYAKAWA AKIFUMI (JP)
FUJITA MASANARI (JP)
SHIBATA HIROYUKI (JP)
SAKAMAKI YOSHITAKA (JP)

Application Number:

PCT/JP1990/000309

Publication Date:

September 20, 1990

Filing Date:

March 09, 1990

Export Citation:

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Assignee:

NIPPON STEEL CHEMICAL CO (JP)

International Classes:

C08F2/02; C08F12/08; C08F279/00; C08F279/02; C08F291/02; (IPC1-7): C08F279/00; C08F291/02

Foreign References:

JPS63113009A	1988-05-18
JPS61143414A	1986-07-01

Other References: