METHOD FOR PRODUCING ACRYLIC RESIN PLATE MATERIAL

摘要

PROBLEM TO BE SOLVED: To produce an acrylic resin plate material scarcely causing Tyndall phenomenon and transmission loss. SOLUTION: A polymerizable raw material consisting mainly of methyl methacrylate is polymerized by a casting method to produce the acrylic resin plate material having >=10 mm plate thickness. The production method comprises a step for polymerizing the raw material until the polymer conversion becomes 30 wt.% to 60 wt.% by temperature-raising pattern of one or more steps at >=20 deg.C and >60 deg.C and a step for polymerizing the raw material so that the polymer conversion of the resin becomes >=97 wt.%. In the production method, the time T before a heat-generation peak by polymerization appear after a time when the latter step starts is within the range of a time represented by the formula (1): T<=0.4×t [wherein T is a time (hr); t is a plate thickness (mm) of the acrylic resin plate material].