Functionalized radial styrene-isoprene copolymers
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United States of America Patent
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Sep 16, 1997
Grant Date -
N/A
app pub date -
Apr 10, 1996
filing date -
Jun 16, 1993
priority date (Note) -
Expired
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Abstract
Adhesive compositions containing a hydroxy-functionalized radial, three-arm copolymer the arms of which contain styrene-isoprene blocks, in which the average molecular weight of the polystyrene blocks is lower than 30,000 and is generally comprised within the range of from 7,000 to 30,000, and the average total molecular weight of said block polymers is comprised within the range of from 120,000 to 250,000. Such a functionalized radial copolymer makes it possible, according to the monomeric composition adopted and by suitably blending with tackifier resins and plasticizer oils, adhesive compositions to be obtained which can be of 'hot melt' type or of solvent borne type, displaying good adhesive and cohesive properties and such as to secure an optimal balance between these properties and their processing ability.
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