Title:
RUBBER-MODIFIED HEAT-RESISTANT STYRENIC RESIN COMPOSITION EXCELLENT IN APPEARANCE AND IMPACT PROPERTIES
Document Type and Number:
Japanese Patent JPH04227649
Kind Code:
A
Abstract:
PURPOSE:To obtain the title composition which is improved in the balance among appearance, impact strength and heat resistance by mixing a styrene-alpha- methylstyrene copolymer optionally containing polystyrene as a continuous phase with specified rubber-like elastomer particles as a dispersed phase. CONSTITUTION:The title composition is prepared by polymerizing styrene and alpha-methylstyrene in the presence of 3 to 15wt.% rubber-like elastomer particles to obtain a continuous phase comprising a styrene-alpha-methylstyrene copolymer containing 10 to 40wt.% alpha-methylstyrene and optionally containing polystyrene, and incorporating therein the rubber-like elastomer having such a continuous particle diameter distribution that 25 to 70wt.% of the particles have a particle diameter of less than 7500Angstrom , 25wt.% or more of the particles have a particle diameter of 7500 to 21,500Angstrom and 18wt.% or less of the particles have a particle diameter of 21,500Angstrom or above as a dispersed phase.
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Inventors:
SHO KAZUHIKO
ASAMIZU NOBUAKI
ASAMIZU NOBUAKI
Application Number:
JP11753791A
Publication Date:
August 17, 1992
Filing Date:
May 22, 1991
Export Citation:
Assignee:
ASAHI CHEMICAL IND
International Classes:
C08L25/08; C08L7/00; C08L25/00; (IPC1-7): C08L25/08
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