申请人:THE B.F. GOODRICH COMPANY
公开号:EP0422500A2
公开(公告)日:1991-04-17
Radiation curable linear thermoplastic polyurethanes having imido pendent groups of the formula (A)
wherein Z is an unsaturated C₂₋₁₂ hydrocarbyl or substituted hydrocarbyl group (preferably H₃CC=CCH₃) capable of undergoing photocrosslinking with another like group Z, are prepared by reaction of (a) a macroglycol of molecular weight 500-7,000, (b) one or more glycol chain extenders each having a molecular weight less than 500, which may include one or more low molecular weight aliphatic glycols (e.g., a C₂₋₁₂ alkylene glycol or mixture thereof), and (c) an organic diisocyanate. Either a macroglycol or a chain extender must include a radiation sensitive pendent imido group of the above formula (A). The thermoplastic polyurethanes herein have hard and soft segments. Pendent groups (A) are present in the hard segments when a chain extender containing pendent group (A) is used, and are present in the soft segment when a macroglycol having pendent group (A) is used. The thermoplastic polyurethanes are useful for various purposes including coatings and magnetic recording media. Radiation curing gives a thermoset polyurethane having high hardness and good solvent resistance.
可辐射固化的线型热塑性聚氨酯,具有式 (A) 的亚氨基垂基
其中 Z 是不饱和 C₂₋₁₂烃基或取代的烃基(最好是 H₃CC=CCH₃),能与另一个类似基团 Z 发生光交联、通过以下反应制备:(a) 分子量为 500-7,000 的大分子二醇;(b) 一种或多种二醇扩链剂,每种扩链剂的分子量均小于 500,其中可包括一种或多种低分子量脂肪族二醇(如:H.g.,C₂₋₁₂ 烷二醇或其混合物),以及 (c) 有机二异氰酸酯。无论是大环二醇还是扩链剂,都必须包括上式 (A) 的辐射敏感的悬垂亚氨基。此处的热塑性聚氨酯具有硬段和软段。当使用含有悬垂基团(A)的扩链剂时,悬垂基团(A)存在于硬段中;当使用具有悬垂基团(A)的多元醇时,悬垂基团(A)存在于软段中。热塑性聚氨酯可用于各种用途,包括涂料和磁性记录介质。辐射固化产生的热固性聚氨酯具有高硬度和良好的耐溶剂性。