Low viscosity hot melt pressure sensitive ashesive compositions
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United States of America Patent
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Dec 29, 1998
Issued Date -
N/A
app pub date -
Jul 22, 1997
filing date -
Nov 28, 1994
priority date (Note) -
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Abstract
A low melt viscosity hot melt pressure sensitive adhesive composition having enhanced tack properties is provided. The composition is based on an S-I-S block copolymer having polystyrene and polyisoprene block segments blended with a petroleum tackier resin which is the Friedel Crafts polymerization product of (i) a cracked petroleum feed containing C.sub.5 olefins and diolefins or a mixture of C.sub.5 and C.sub.6 olefins and dioelefins copolymerized with (ii) from about 5 to 15% by weight of a monovinyl aromatic monomer having 8 or 9 carbon atoms, e.g., styrene. The composition optionally also includes a polystyrene--polyisoprene diblock copolymer and a processing oil. The composition may be readily applied as solvent-free melt to various substrates using coating die technology because of its low melt viscosity at coating temperatures.
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