The invention relates to a novel low profile additive (LPA) for uncured polyester resins and the resultant molding compositions. The low profile additive is the reaction product of an ethylene/alphaolefin copolymer with a carboxylic acid or anhydride, to thereby form a non-thermoplastic carboxyl modified polyolefin. The novel LPA is a remarkably effective dimensional stabilizer and has displayed the ability to achieve net expansion in a cured polyester resin molding composition.  
                            本发明涉及一种用于未固化聚酯
树脂及其成型组合物的新型低曲线添加剂(LPA)。 这种低曲线添加剂是
乙烯/α烯烃共聚物与
羧酸或酸酐的反应产物,从而形成一种非热塑性的羧基改性聚烯烃。 这种新型 LPA 是一种非常有效的尺寸稳定剂,并显示出在固化聚酯
树脂成型组合物中实现净膨胀的能力。