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US 8,557,393 B2Granted
Adhesive thermoplastic vulcanizates
AssigneeExxonMobil Chemical Patents Inc.
InventorsTonson Abraham, Norman G. Barber
Life of this patent
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Abstract
In one or more embodiments of this invention, TPE compositions having between 55 and 85 Shore A hardness and having good adhesion to metal substrates, are produced by blending an amount of unsaturated carboxylic acid functionalized thermoplastic resin with a very soft TPV, namely, a TPV base having a hardness of 45 Shore A or less.
Claims17
An adhesive thermoplastic elastomer composition comprising:
- (a) from 60 to 80 weight percent, based on the weight of the adhesive thermoplastic elastomer, of a TPV having a Shore A hardness of less than 45 and comprising
- (i) from 2 to 10 weight percent, based upon the TPV, of a thermoplastic resin;
- (ii) from 2 to 50 weight percent, based upon the TPV, of a thermoplastic propylene/ethylene random or block copolymer;
- (iii) from 45 to 96 weight percent, based upon the TPV, of a cross-linked elastomer;
- and
- (iv) from 100 to 225 phr of process oil;
- and
- (b) from 40 to 20 weight percent, based on the weight of the adhesive thermoplastic elastomer, of an unsaturated carboxylic acid functionalized thermoplastic resin, wherein the thermoplastic resin of the unsaturated carboxylic acid functionalized thermoplastic resin is a thermoplastic polyolefin resin, and, wherein the unsaturated carboxylic acid is acrylic acid or methacrylic acid;
- wherein the carboxylic acid content of the functionalized thermoplastic resin is greater than 6.5 wt % but less than 17 wt %, based on the weight of the functionalized thermoplastic resin.
6 more elements
A composition consisting essentially of:
- (a) a TPV having a Shore A hardness of less than 45 and consisting essentially of:
- (i) a crosslinked ethylene-propylene-diene elastomer;
- (ii) polypropylene;
- (iii) ethylene-propylene rubber and an ethylene-propylene thermoplastic resin;
- (iv) paraffinic oil or polyisobutylene oil;
- (v) clay;
- and
- (vi) zinc oxide;
- and
- (b) an ethylene/acrylic acid copolymer having 6 to 18 wt% acid content, based on the weight of the ethylene/acrylic acid copolymer.
7 more elements
Dependencies are inferred from the claim text.