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US 4,469,754 AGranted
Heat seal composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsGeorge L. Hoh, Donald A. Vassallo
Life of this patent
Estimating the term…
Abstract
Heat seal compositions and articles including the compositions are disclosed. The compositions exhibit a broad temperature 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.
Claims7
A flexible packaging material comprising a substantially homogeneous blend of polymeric materials comprising:
- (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 alkanoic 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, ethylenically unsaturated monocarboxylic acid selected from the group consisting of acrylic acid and methacrylic acid
- wherein the sum of the weight percentages of comonomers ii and iii in the terpolymer is at least eight percentage points higher than the weight percentage of comonomer ii in the ionomer and wherein 5 to 40 percent of the carboxylic acid in the blend is neutralized by zinc or magnesium ions coated onto a substrate packaging material.
6 more elements
Dependencies are inferred from the claim text.