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AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsAkitoshi Sugio, Masanobu Masu, Hiroshi Nakai, Yukio Sasaki
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An improved method for dispersing an inorganic pigment uniformly in polyphenylene ether resins. A polyphenylene ether composition having an inorganic pigment uniformly dispersed therein is obtained by intimately mixing a polyphenylene ether resin and the inorganic pigment in a weight ratio of from 0.5:1 to 2:1 by a high-speed mixer to form a pre-blend, and then mixing the pre-blend intimately with a polyphenylene ether in a conventional mixer such as an extruder. The pre-blend can also be uniformly dispersed in a mixture of the polyphenylene ether with polystyrene, a styrene/butadiene copolymer, a styrene/butadiene/acrylonitrile terpolymer, or a rubber-modified high impact polystyrene.
In a method for preparing a resin composition composed of a polyphenylene ether alone or a polyphenylene ether and a styrene polymer, and an inorganic pigment, the improvement which comprises intimately mixing the polyphenylene ether and the inorganic pigment in a weight ratio of from 0.5:1 to 2:1 by a high-speed mixer wherein the linear speed of the tips of the stirring impellers is maintained at 5 to 50 m/sec to form a pre-blend, and admixing in an extruder the pre-blend intimately with the polyphenylene ether alone or the polyphenylene ether and the styrene polymer.
Dependencies are inferred from the claim text.