The present invention provides a fluorine-containing elastomer composition of which viscosity can be decreased without increasing an amount of expensive monomer while maintaining physical properties in normal state of a branched fluorine-containing elastomer. The composition is a peroxide-crosslinkable fluorine-containing elastomer composition comprising (A) a branched fluorine-containing elastomer having peroxide-crosslinkable cure site, which has a number average molecular weight of from 1,000 to 300,000 and a Mark-Houwink gradient "a" of less than 0.6 when an absolute weight molecular weight and an intrinsic viscosity are plotted on a Mark-Houwink plot having an axis of abscissa of absolute weight molecular weight and an axis of ordinate of intrinsic viscosity, and (B) a straight chain type fluorine-containing polymer having a number average molecular weight of from 1,000 to 250,000 and a Mark-Houwink gradient "a" of not less than 0.6.
本发明提供了一种含
氟弹性体组合物,它可以在不增加昂贵单体用量的情况下降低粘度,同时保持支链含
氟弹性体正常状态下的物理性能。该组合物是一种可过氧化物交联的含
氟弹性体组合物,包括 (A) 具有可过氧化物交联固化位点的支链含
氟弹性体,该弹性体的平均分子量为 1,000 至 300,000 之间,当绝对分子量和 Mark-Houwink 梯度 "a "小于 0.(B) 平均分子量为 1,000 至 250,000 的直链型含
氟聚合物,其 Mark-Houwink 梯度 "a "不小于 0.6。