Low viscosity hot melt pressure sensitive ashesive compositions

Details Low viscosity hot melt pressure sensitive ashesive compositions Low viscosity hot melt pressure sensitive ashesive compositions

1997-07-22

1998-12-29

Woodward, Ana

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Adhesive outermost layer

428349, 428355, 428507, 428509, 428512, 524483, 524484, 524505, C08L 906, C09U 702

Patent

active

058538747

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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Encyclopedia of Chemical Technology, (Fourth Edition), 1995, vol. 13, pp. 727-728.

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