Takeda Chemical Industries, Inc.

Polyplastics Co., Ltd.

Takeda Chemical Indus., Ltd.

Takao Teraoka

Junji Oshima

Ichiro Sasaki

Minoru Yamada

Toru Katsumata

Goro Shimaoka

Shizuo Togo

Kazuhiko Ishii

Koichi Sato

Junji Ohshima

Polyacetal resins can selectively be reduced in terms of surface gloss by the addition of a core-shell polymer. The core-shell polymer which serves as the surface gloss reducing agent is one which has a rubbery polymer as its core, and a glassy vinyl copolymer having an oxygenic group (e.g., a hydroxyl or glycidyl group) as its shell. Preferably, the core-shell polymer is emulsion polymerized in sequential stages to form the core and shell polymers by use of an oligomeric surfactant. The core-shell polymer is most preferably present in the polyacetal compositions in an effective amount of between 1 to 50 parts by weight, based on 100 parts by weight of the polyacetal base resin.

Polyacetal compositions having surface gloss reducing effective amounts

The present invention relates to a core-shell polymer which is useful for polyoxymethylene resin, a polyoxymethylene resin composition containing the core-shell polymer and a molded article made of the polyoxymethylene resin. The core-shell polymer is produced by an emulsion polymerization reaction using an oligomeric surfactant and a neutral radicals-liberating polymerization initiator. This core-shell polymer makes the molded article be improved on the impact strength, elongation at the weld line, weatherability, thermal stability, etc., and the molded articles is used as various products.

Core-shell polymer and its use

There is disclosed a core-shell polymer which comprises:

Core-shell polymer, resin composition and molded articles thereof

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Akashi, Japan

Takao Teraoka