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AssigneeKuraray Co., Ltd.
InventorsYoshio Fuchigami, Kouichi Warino, Shigeo Matsumaru, Yosokichi Kobayashi
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A composition of methacrilic resin which constitutes a resin possessing an outstandingly easy release from the mold of injection molding machine without defilement of the stamper and the peripheral ring of stamper holder, and therefore proves suitable material for replica of raser disk is provided. This methacrylic resin composition is characterized by having incorporated in a methyl methacrylate copolymer the three lubricant components, i.e. a higher alcohol (x), a monoglyceride of a higher fatty acid (y), and a paraffin (z), in such amounts that the individual contents of (x), (y), and (z) are in the respective ranges of 0.05 to 0.2% by weight, 0.05 to 0.2% by weight, and 0.02 to 0.15% by weight and the total content of (x), (y), and (z) is in the range of 0.2 to 0.35% by weight.
A methacrylic resin composition which comprises a methyl methacrylate copolymer, a higher alcohol having 12-18 carbon atoms (x), a monoglyceride Of a higher fatty acid having 16-22 carbon atoms (y), and a paraffin (z), providing the individual contents of x, y, and z are in the respective ranges of 0.05 to 0.2% by weight, 0.05 to 0.2% by weight, and 0.02 to 0.15% by weight and the total content of x, y, and z is in the range of 0.2 to 0.35% by weight.
Dependencies are inferred from the claim text.