Thermoplastic elastomers having improved adhesive properties
AssigneeExxonMobil Chemical Patents Inc.
InventorsJustin Crafton, Jim Johnson
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Abstract
This document relates to adhesive compositions comprising 1) a thermoplastic vulcanizate of thermoplastic polyurethane and at least partially crosslinked rubber, and 2) an adhesion modifying amount of styrenic block copolymer. These compositions are especially useful in adhering to polar engineering thermoplastics and so find utility in laminates and composite articles comprising at least one polar engineering substrate and the described adhesive compositions.
Claims12
An adhesive composition comprising
- (a) from 75 to 97 weight percent of the total composition of a thermoplastic vulcanizate comprising i) from 50 to 86.6 weight percent, based upon the weight of i) plus ii), of a thermoplastic polyurethane having a glass transition point less than 60° C. and ii) from 13.4 to 50 weight percent, based upon the weight of i) plus ii), of an at least partially cross-linked rubber;
- and,
- (b) from 3 to 25 weight percent of the total composition of a styrenic block copolymer.
A shaped article comprising at least one layer of a polar engineering thermoplastic substrate which is at least partially in adherent contact with a composition comprising (a) from 75 to 97 weight percent of the total composition of a thermoplastic vulcanizate comprising i) from 50 to 86.6 weight percent, based upon the weight of i) plus ii), of a thermoplastic polyurethane having a glass transition point less than 60° C. and ii) from 13.4 to 50 weight percent, based upon the weight of i) plus ii), of an at least partially cross-linked rubber;
- and, (b) from 3 to 25 weight percent of the total composition of a styrenic block copolymer.
A method for the preparation of an adhesive composition comprising:
- a) melt processing in the presence of a cross-linking agent under conditions of dynamic vulcanization, i) a thermoplastic polyurethane, ii) a cross-linkable rubber;
- b) melt blending with the i) polyurethane and ii) rubber of a), iii) a styrenic block copolymer.
Dependencies are inferred from the claim text.