Multicomponent polymer compositions

Claim 1

A compatible blend of polymers consisting essentially of: (a) an olefin polymer, (b) an ethylene copolymer, (c) an ionomer resin, and (d) a tackifying resin; said olefin polymer being a polymer comprising polymerized ethylene with any comonomer polymerized therewith being a C 3 or higher alpha-olefin and having a density of at least about 0.95 gram/ml or an isotactic propylene polymer; said ethylene copolymer having polymerized therein about 70 to 90 weight % of ethylene and the balance an alkyl ester of acrylic or methacrylic acid or vinyl acetate; said ionomer resin having a high load melt index of at least about 1.0 and a normal load melt index of up to about 50, and being a metal salt of an ethylene-acid copolymer which is a copolymer of ethylene and acrylic or methacrylic acid having an acid content of about 1-10 mol %; and said tackifying resin being selected from the group consisting of: (a) terpene resins having a Ring and Ball softening point of about 10°-150° C., (b) aliphatic hydrocarbon resins having a Ring and Ball softening point of about 10°-135° C., (c) rosin esters having a Ring and Ball softening point of about 65°-140° C., (d) alpha-methylstyrene/vinyl toluene copolymers having a Ring and Ball softening point of about 75°-120° C., (e) polystyrene resins having a Ring and Ball softening point of about 25°-100° C., and (f) terpene-phenolic resins having a Ring and Ball softening point of about 80°-135° C.; and (g) rosin, said composition containing the olefin polymer and the ethylene copolymer in the combined amount of 100 parts by weight and containing the ionomer resin and the tackifying resin in the combined amount of about 15-200 parts by weight; and the olefin polymer and the ethylene copolymer being present in proportions such that the alkyl ester or vinyl acetate moiety of the ethylene copolymer constitutes about 4-12 weight % of the total weight of said two polymers.