Low viscosity adhesive compositions containing asymmetric radial polymers
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United States of America Patent
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Aug 27, 1996
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app pub date -
Nov 9, 1994
filing date -
Nov 9, 1994
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Abstract
A low viscosity adhesive composition which comprises: (a) an asymmetric radial block copolymer of a vinyl aromatic hydrocarbon and at least one conjugated diene having from 3 to 6 polymer arms, which: (i) contains from 33 to 85% by weight of polyvinyl aromatic hydrocarbon block/polydiene block copolymer arms and the balance polydiene homopolymer arms, (ii) has vinyl aromatic hydrocarbon blocks with block molecular weights of from 8000 to 30,000, (iii) has conjugated diene blocks in the copolymer arms with a molecular weight of at least 6000, and (iv) has a polyvinyl aromatic hydrocarbon content of from 10 to 40% by weight; and (b) from 20 to 400 parts per hundred parts of polymer of a tackifying resin. The invention also encompasses the polymers used in the adhesive.
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