Novel pressure sensitive adhesives
OwnerDavid L. Sieverdinginventor
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Abstract
This invention relates to relatively thick pressure sensitive adhesive films comprising a homogeneous mixture based on 100% of the solids weight of the adhesive film, (i) at least 20 weight % of a low molecular weight resin produced by the polymerization and hydrogenation of styrenic monomer feedstock having a ring and ball softening point of about 10.degree.-45.degree. C., (ii) from about 2 to about 40 weight % of a triblock copolymer with a saturated elastomeric block in the center and a thermoplastic block on each end alone or in combination with a diblock copolymer of a hard thermoplastic block and a saturated, soft ethylene-propylene polymeric block, and (iii) up to about 80 weight % of a mineral oil.
Claims12
Adhesive films, at least 1 mil thick, comprising an essentially homogeneous mixture containing, based on 100% of the solids weight of the adhesive, (i) at least 20 weight % of a low molecular weight resin produced by the polymerization and hydrogenation of styrenic monomer feedstock having a ring and ball softening point of about 10.degree.-45.degree. C., (ii) from about 2 to about 40 weight % of a triblock copolymer of an ethylene-1-butylene copolymer elastomer containing polystyrene end polymer groups having a styrene polymer or oligomer block to ethylene-butylene rubber block weight ratio of about 0.45 to about 0.55 alone or in combination with a diblock copolymer of a hard thermoplastic block and a saturated, soft ethylene-propylene polymeric block, and (iii) up to about 80 weight % of a mineral oil.
Dependencies are inferred from the claim text.