日本三菱人造丝公司开发出世界上第一例丙烯酸树脂片状成型料 (ＳＭＣ)。大多数的片状成型料是不饱和聚酯树脂 ,该公司使用一种热固型改性丙烯酸类树脂 ,使树脂和玻璃纤维的热膨胀系数的差距缩小 ,从而成功地开发出一种可使这两种不同材料共混的体系。因为该公司开发的ＳＭＣ的 Japan’s Mitsubishi Rayon Co. has developed the world’s first acrylic resin sheet molding compound (SMC). Most of the flake-forming materials are unsaturated polyester resins. The company uses a thermosetting modified acrylic resin to reduce the difference in thermal expansion coefficient between the resin and the glass fiber, and succeeded in developing a Two different materials blend system. Because the company developed SMC