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Development of AAS resin by the emulsion–suspension polymerization method
Author(s) -
Kohkame Hisashi,
Shitara Masashi,
Tanno Seikichi,
Muroi Tadashi
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070461008
Subject(s) - emulsion polymerization , materials science , natural rubber , polymerization , acrylonitrile , composite material , suspension polymerization , emulsion , polymer chemistry , styrene , polymer , chemical engineering , copolymer , engineering
In order to improve the weatherability of acryonitrile—styrene—butadiene rubber graft polymer (ABS resin), an attempt was made to develop a resin (AAS resin) in which acrylic rubber of good weatherability was used instead of butadiene rubber. First, by copolymerizing dicyclopentenyl‐methacrylate (DCP‐MA,3%) with butyl acrylate, crosslinked acrylic rubber was obtained. This also introduced grafting sites into the rubber. Next, methods of graft copolymerizing styrene and acrylonitrile with this rubber were examined. An emulsion–suspension polymerization method was developed in which the initial stage of the polymerization, emulsion polymerization, changed into suspension polymerization during the process. By this method of polymerization, rubber particles were combined and enlarged, bringing about a graft‐type resin with high impact resistance. This polymerization method is industrially useful because particle‐shaped resins are obtained without the need of a salting‐out process. The AAS resin, obtained in this way, has much improved weatherability over ABS resin and shows strength equal to that of ABS resin. © 1992 John Wiley & Sons, Inc.