This invention in chip resistance methyl methacrylic rate type resin, adding the polysiloxane compound which possesses the structure of the below-mentioned chemical formula 1 in regard to the chip resistance methyl methacrylate resin constituent where scratch resistance improves, regards the chip resistance methyl methacrylate resin constituent which is superior in the scratch resistance which can.[Chemical formula 1](In aforementioned chemical formula 1, R, R, R and R becoming independent respectively, carbon count are the alkylene basis 1 - 5, m, n is integer of 1 or more.)
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