Any of numerous thermoplastic or thermosetting polymers or copolymers of acrylic acid, methacrylic acid, esters of these acids, or acrylonitrile, used to produce paints, synthetic rubbers, and lightweight plastics.丙烯酸类树脂：热塑性或热固性聚合物，或是由丙烯酸、甲基丙烯酸、这些酸的脂、丙烯腈组成的共聚物，可用以制造涂料、合成橡胶和轻质塑料