Extrudable self-supporting hot melt adhesive sheet
AssigneeE. I. Du Pont de Nemours and Company
InventorsEdward G. Brugel, Walter Yllo
Life of this patent
Estimating the term…
Abstract
Extrudable, self-supporting, nonblocking hot melt adhesive sheet is obtained by blending about 10-50% by weight of an ethylene interpolymer, such as ethylene/vinyl ester, ethylene/unsaturated mono- or dicarboxylic acids or esters of said unsaturated acids, etc.; 2-30% by weight of a plasticizer selected from the group consisting of processing oils, epoxidized oils, polyesters, polyethers, polyether esters and combinations thereof; about 20-80% by weight of filler; from 0 to about 10% by weight of at least one additive, such as organic acids, organic acid derivatives and surface active agents.
Claims16
An extrudable self-supporting hot melt adhesive sheet which is nonadhesive at room temperature but is adhesive at about 150.degree. F., is self-supporting at about 200.degree.-350.degree. F. and has a melt index of from about 10 to about 500, said sheet comprising (a) from about 10 to about 50% by weight of at least one copolymer of ethylene with at least one comonomer selected from the group consisting of vinyl esters of saturated carboxylic acids wherein the acid moiety has up to 4 carbon atoms, unsaturated mono- and dicarboxylic acids of 3 to 5 carbon atoms, salts of said unsaturated acids, and esters of said unsaturated acids wherein the alcohol moiety has 1 to 8 carbon atoms, the ethylene content of said copolymer being from about 40 to about 95% by weight, the comonomer content of said copolymer being from about 5 to about 60% by weight, and the melt index of said copolymer or combination of copolymers being such that would result in a melt index of from about 10 to about 500 for the fully compounded adhesive, provided that when said copolymer of ethylene is an ethylene/vinyl ester or ethylene/unsaturated mono- or dicarboxylic acid ester copolymer said copolymer can contain up to about 15 percent by weight of carbon monoxide or sulfur dioxide;
- (b) from 2 to about 30 percent by weight of at least one plasticizer selected from the group consisting of processing oils, epoxidized oils, polyesters, polyethers, and polyether esters;
- (c) from about 20 to about 80% by weight of filler;
- (d) from 0 to about 10% by weight of at least one additive selected from the group consisting of organic acids, organic acid derivatives and surface active agents.
Dependencies are inferred from the claim text.