公开(公告)号：US06444719B1

公开(公告)日：2002-09-03

申请号：US09529012

申请日：2000-04-06

申请人： Tomohiro Mizumoto ,  Masahiko Moritani ,  Norio Sugimura

发明人： Tomohiro Mizumoto ,  Masahiko Moritani ,  Norio Sugimura

IPC分类号： B29C4402

CPC分类号： C08J9/122 ,  C08J5/00 ,  C08J9/12 ,  C08J2201/032 ,  C08J2333/12

摘要： Provided are a method for producing a crystalline methacrylic resin, the method comprising a step of bringing a mixture of an isotactic methyl methacrylate-type polymer and a syndiotactic methyl methacrylate-type polymer into contact with high pressure gas and a method for producing a plastic foam of the crystalline methacrylic resin, the method comprising a step of foaming the mixture. According to the method of the present invention, a crystalline methacrylic resin which is not limited in a form applicable to molded articles thereof and has high crystallinity and excellent solvent resistance can be obtained in a simple method and a plastic foam of the crystalline methacrylic resin can be obtained, the plastic foam embracing fine cells having an average cell diameter of about 10 &mgr;m or less and a cell number density of 109 to 1015 cells/cm3. Such a plastic foam is superior in the solvent resistance and in the mechanical properties such as impact resistance and bending strength.

摘要翻译： 提供一种生产结晶甲基丙烯酸树脂的方法，该方法包括使全同立构甲基丙烯酸甲酯类聚合物和间同立构甲基丙烯酸甲酯类聚合物的混合物与高压气体接触的步骤和制造塑料泡沫的方法 的结晶甲基丙烯酸树脂，该方法包括使混合物发泡的步骤。 根据本发明的方法，可以简单的方法得到结晶性甲基丙烯酸系树脂，其结晶性甲基丙烯酸系树脂的塑料泡沫体可以通过简单的方法得到结晶性甲基丙烯酸系树脂，该结晶性甲基丙烯酸系树脂不限于其成形品，结晶性高，耐溶剂性优异 可以获得具有平均泡孔直径约10μm或更小并且孔数密度为109至1015个/ cm 3的细胞的塑料泡沫。 这种塑料泡沫体的耐溶剂性和耐冲击性和弯曲强度等机械性能优异。