申请人:MINNESOTA MINING AND MANUFACTURING COMPANY
公开号:EP0327258A2
公开(公告)日:1989-08-09
Normally solid, organic solvent-soluble, thermoplastic, polyethylenically-unsaturated, cellulosic polyurethane polymers are provided. These cellulosic polyurethane polymers comprise one or more cellulose ether or ester segments, one or more alkylene moieties having at least two carbon atoms and which can be substituted or interrupted by ether oxygen atoms, ester groups, or phenylene groups, two or more residues of diisocyanates, the segments, moieties, and residues being linked together by linking groups with the proviso that said alkylene moieties contain sufficient ethylenic unsaturation that said polymer can be crosslinked to a solvent-insoluble state. The cellulosic polyurethane polymers can be obtained by the polymerization of a reaction mixture comprising (a) aliphatic or cycloaliphatic diol comprising sufficient ethylenically-unsaturated diol to permit crosslinking of the polymerization product to a solvent-insoluble state; (b) organic solvent-soluble cellulose ether or ester having residual unreacted cellulosic hydroxyl groups; and (c) organic diisocyanate. The reaction product may optionally also contain primary or secondary aliphatic or aromatic diamines or dithiols. Also provided are coating compositions and shaped articles and methods for preparing same.
提供了通常为固体、有机溶剂可溶、热塑性、聚乙烯不饱和的纤维素聚氨酯聚合物。这些纤维素聚氨酯聚合物包括一个或多个纤维素醚或酯段,一个或多个至少具有两个碳原子且可被醚氧原子、酯基或亚苯基取代或中断的亚烷基,两个或多个二异氰酸酯残基,这些段、基和残基通过连接基连接在一起,但条件是所述亚烷基含有足够的乙烯不饱和度,使所述聚合物可以交联成溶剂不溶状态。纤维素聚氨酯聚合物可通过聚合反应混合物获得,该反应混合物包括:(a) 脂肪族或环脂族二元醇,其中含有足够的乙烯不饱和二元醇,使聚合产物可以交联成不溶于溶剂的状态;(b) 有机溶剂可溶性纤维素醚或酯,具有残留的未反应的纤维素羟基;(c) 有机二异氰酸酯。反应产物还可选择含有伯或仲脂肪族或芳香族二胺或二硫醇。此外,还提供了涂层组合物和成型制品以及制备方法。