Heat aging resistant ethylene vinyl acetate copolymer composition and process for its production
AssigneeE. I. Du Pont de Nemours and Company
InventorSteven R. Oriani
Life of this patent
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Abstract
Heat resistant ethylene vinyl acetate copolymer compositions comprising a blend of ethylene vinyl acetate copolymer, peroxide curable polyacrylate elastomer, and polyamide are described. When crosslinked with a peroxide curative, the ethylene vinyl acetate copolymer compositions exhibit enhanced resistance to heat aging compared to conventional ethylene vinyl acetate elastomer compositions.
Claims20
A blend composition of ethylene vinyl acetate copolymer, peroxide curable polyacrylate elastomer, and polyamide, said blend composition consisting essentially of
- (A) from about 10 wt % to about 98 wt % of an ethylene vinyl acetate copolymer component said ethylene copolymer component comprising one or more ethylene vinyl acetate copolymers of at least 40% by weight copolymerized vinyl acetate monomer units;
- and
- (B) from about 1 wt % to about 50 wt % of a one or more of peroxide curable polyacrylate elastomer component comprising copolymerized units of alkyl acrylate, and at least 0.03 mol % of an amine or acid reactive monomer selected from the group consisting of unsaturated carboxylic acids, anhydrides of unsaturated carboxylic acids, and unsaturated epoxides;
- and
- (C) from about 1 wt % to about 60 wt % of a polyamide component comprising one or more polyamides having a melting peak temperature of at least 160° C.,
- wherein said blend composition has a Mooney viscosity (ML 1+4, 100° C.) determined according to ASTM D1646 of 5 to 200;
- and wherein each of the weight percentages of the ethylene vinyl acetate copolymer, polyacrylate elastomer, and polyamide components are based on the combined weight of the ethylene vinyl acetate copolymers, polyacrylate elastomers, and polyamides in the blend composition.
A curable composition comprising
- (A) a blend composition of ethylene vinyl acetate copolymer, peroxide curable polyacrylate elastomer, and polyamide comprising:
- (i) from about 10 wt % to about 98 wt % of an ethylene vinyl acetate copolymer component comprising one or more ethylene vinyl acetate copolymers wherein each of the ethylene vinyl acetate copolymer comprises at least 40% by weight copolymerized vinyl acetate monomer units;
- and
- (ii) from about 1 wt % to about 50 wt % of one or more of a peroxide curable polyacrylate elastomer component comprising copolymerized units of alkyl acrylate, and at least 0.03 mol % of an amine or acid reactive monomer selected from the group consisting of unsaturated carboxylic acids, anhydrides of unsaturated carboxylic acids, and unsaturated epoxides;
- and
- (iii) about 1 wt % to about 60 wt % of a polyamide component comprising one or more polyamides having a melting peak temperature of at least 160° C.,
- wherein the blend composition (A) has a Mooney viscosity (ML 1+4, 100° C.) determined according to ASTM D1646 of 5 to 200 and the weight percentages of each of the ethylene vinyl acetate copolymer, polyacrylate elastomer, and polyamide components are based on the combined weight of the components of the blend composition and;
- (B) a curative.
The process of claim, wherein said peroxide curative is added at a temperature below 160° C.
Dependencies are inferred from the claim text.