发明授权
US5627235A Multiblock hydrogenated polymers for adhesives 失效
用于粘合剂的多嵌段氢化聚合物

Multiblock hydrogenated polymers for adhesives
摘要:
The present invention encompasses nontapered block copolymers of the following structure and adhesives containing themD--A--(B--A).sub.n --D.sub.xor(D--A--B).sub.z --Ywhere A is a vinyl aromatic hydrocarbon polymer block, B and D are hydrogenated conjugated diene polymer blocks wherein if the diene is butadiene, it must have a vinyl content of at least 30 percent by weight, n is an integer from 1 to 5, x is 0 or 1, z is an integer from 2 to 30, and Y is a multifunctional coupling agent and the copolymer has a vinyl aromatic hydrocarbon content of from 9 to 35 percent by weight. The ratio of the molecular weight of D to that of B ranges in accordance with the normalized molecular weight factor which may range from greater than 0 up to 180.times.10.sup.-6.
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