Three-component polymer blends and adhesive films prepared therefrom
AssigneeThe Dow Chemical Company
InventorBruce A. Metzger
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Abstract
Polymer blends are provided which are characterized by good processability on conventional extrusion equipment to provide films having excellent adhesion to various substrates while still exhibiting good non-blocking properties during film manufacture, storage, shipment and use. Such blends comprise, based upon the total blend weight, from 5 to about 90 weight percent of a high melt index adhesive resin; from about 5 to about 90 weight percent of a relatively low melt index adhesive resin; and from about 5 to about 70 weight percent of non-adhesive resin having a melt index of from about 3 to about 10.
Claims20
A normally solid thermoplastic polymer blend composition comprising, based upon the total weight of said composition,
- (a) from about 5 to 90 weight percent of a first adhesive resin having a melt index of from about 50 to about 700 and comprising a random copolymer of a major proportion by weight of ethylene and a minor proportion by weight of an ethylenically unsaturated carboxylic acid;
- (b) from about 5 to about 90 weight percent of a normally solid second adhesive resin having a melt index of from about 3 to about 15 and comprising a random copolymer of a major proportion by weight of ethylene with a minor proportion by weight of an ethylenically unsaturated carboxylic acid;
- and
- (c) from about 5 to about 70 weight percent of a normally solid non-adhesive resin having a melt index of from about 3 to about 10 and comprising a homopolymer of ethylene or a copolymer of a major proportion by weight of ethylene and a minor proportion by weight of a C.sub.4 -C.sub.12 .alpha.-olefin.
Dependencies are inferred from the claim text.