Low stress relaxation adhesive having high molecular weight endblock copolymer
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United States of America Statutory Invention Reg
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Apr 6, 2004
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N/A
app pub date -
Jul 9, 1997
filing date -
Jul 9, 1997
priority date (Note) -
Expired
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Abstract
An adhesive formulation is provided comprising an elastomeric block copolymer having a midblock segment derived from polymerized diene monomer and at least two endblock segments derived from polymerized monovinyl substituted aromatic compound monomer, a midblock compatible tackifier, a midblock compatible oil, and endblock compatible resin and an antioxidant. The block copolymer can be either an unhydrogenated polymer having terminal endblocks with a molecular weight within the range of 13,000 to 30,000 or it can be a hydrogenated copolymer having terminal endblocks with a molecular weight of 11,000 to 20,000. The presence of roughly high molecular weight endblock segments results in an adhesive composition having superior (lower) stress relaxation and set.
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