C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
117/204, 400/656
C08L 23/00 (2006.01) C08L 23/02 (2006.01) C08L 23/08 (2006.01) C09J 123/08 (2006.01)
Patent
CA 1200643
Abstract of the Disclosure Heat seal compositions and articles including the compositions are disclosed. The compositions exhibit a broad tempeature range for making heat seals of variable strengths and are useful as the sole heat seal composition in making flexible packages requiring both permanent and peelable seals. The compositions, which are sub- stantially homogeneous blends of polymeric materials comprise (a) 20 to 80 percent, by weight, of a terpolymer having as monomeric components, i) 65 to 95 percent, by weight, ethylene, ii) 4 to 30 percent, by weight, vinyl alkanoate or an ester selected from the group consisting of alkyl acrylate, and alkyl methacrylate wherein the alkanoic acid moiety of the alkanoate and the alkyl group have one to four carbon atoms, and iii) 0.5 to 20 percent, by weight ethylenically unsaturated monocarboxylic acid selected from the group consisting of acrylic acid and methacrylic acid; and (b) 20 to 80 percent, by weight of an ionomer having, as monomeric components, i) 75 to 99 percent, by weight, ethylene, ii) 1 to 25 percent, by weight, ethyleni- cally unsaturated monocarboxylic acid selected from the group consisting of acrylic acid and methacrylic acid wherein the sum of the weight percentages of comono- mers ii and iii in the terpolymer is at least eight percentage points higher than the weight percentage of comonomer ii in the ionomer, wherein 5 to 75 percent of the carboxylic acid groups in the ionomer is neutralized by zinc ions, and wherein 5 to 40 percent of all of the carboxylic acid groups in the blend is neutralized by zinc ions.
403902
Hoh George L.
Vassallo Donald A.
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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