| 摘要 |
A hot melt sealant composition which comprises:- a. 0-50 parts by weight of a multiblock copolymer having at least two endblocks A and at least one elastomeric midblock B; b. 50-100 parts by weight of one or more diblock copolymers consisting of one block A min and one block B min , wherein: the blocks A and A min comprise monoalkenyl arene blocks and the blocks B and B min comprise hydrogenated conjugated diene polymer blocks, and the average molecular weight of the blocks A and A min is greater than the minimum molecular weight needed to obtain microphase separation and domain formation of the blocks A and A min , and is less than the maximum molecular weight which would render the polymer incapable of being melt processed; c. 50-400 parts by weight of a midblock compatible component wherein said midblock compatible component is preferentially compatible with block B and B min , said component present in a content sufficient to maintain the resultant composition in a pliable condition at room temperature and to maintain Tg of the composition below 10 DEG C; and d. 0-100 parts by weight of an endblock compatible resin, with said resin being preferentially compatible with block A, being coumarone-indene resin, polystyrene, vinyltoluene- alpha -methylstyrene copolymer or polyindene.
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