PRODUCTION OF METHACRYLIC RESIN PLATE

摘要

PURPOSE:To obtain the subject product of high quality with high productivity under excellent workability by adding a specified polymerization initiator to a syrup produced from methyl methacrylate, subsequently charging the resultant mixture into a die and carrying out polymerization using a specified method. CONSTITUTION:Methyl methacrylate alone or a monomer mixture composed of >=60wt.% methyl methacrylate and <=40wt.% acrylic ester is initially polymerized to obtain a syrup. A peroxide (preferably peroxy ester) having 50-58 deg.C 10hr half life temperature and 2,2'-(azobis)isobutyronitrile are than added to the above-obtained syrup and the resultant mixture is subsequently charged into a die followed by polymerization in an atmosphere of 75-90 deg.C for 5-15min. Polymerization is then carried out in an atmosphere of a temperature 3-12 deg.C lower than the above-mentioned polymerization temperature until the conversion to polymer reaches 80-95%. Heat treatment is subsequently carried out at 95-140 deg.C for completion of polymerization, thus providing the objective product.