Resin modification for glass fiber adherence

Claim 1

A method of improving the adherence between an uncured polyolefin resin and a sized glass fiber incorporated into said uncured resin as reinforcement and having on its surface a coating comprising the residue obtained by removing water from an aqueous composition comprising an oxidized polyolefin, a carboxylated high molecular weight elastomer and a silane which method comprises forming a mixture comprising an uncured polyolefin resin and said sized glass fiber and at least one acid selected from the group consisting of substitued benzoic acids, benzenedicarboxylic acids, benzenetricarboxylic acids, benzenetetracarboxylic acids, benzenepentacarboxylic acids, benzenehexacarboxylic acids, cyclohexanedicarboxylic acids, fatty acids, aliphatic diacids, benzenediacrylic acids, benzenediacetic acids, naphthoic acids, naphthalenedicarboxylic acids and naphthalenedisulfonic acids, said acid being added in an amount sufficient to increase the tensile strength of the glass-containing polyolefin resin after curing to a tensile strength greater than the tensile strength of the glass-containing cured resin in the absence of said acid, and molding said mixture to cure said uncured resin, and to incorporate said glass in said cured resin in reinforcing relationship.

Claim 2

A method of improving the adherence between an uncured polyolefin resin and a sized glass fiber incorporated into said uncured resin as reinforcement and having on its surface a coating comprising the residue obtained by removing water from an aqueous composition comprising an oxidized polyolefin, a carboxylated high molecular weight elastomer and a silane which method comprises forming a mixture comprising an uncured polyolefin resin and said sized glass fiber and at least one acid selected from the group consisting of substitued benzoic acids, benzenedicarboxylic acids, benzenetricarboxylic acids, benzenetetracarboxylic acids, benzenepentacarboxylic acids, benzenehexacarboxylic acids, cyclohexanedicarboxylic acids, fatty acids, aliphatic diacids, benzenediacrylic acids, benzenediacetic acids, naphthoic acids, naphthalenedicarboxylic acids and naphthalenedisulfonic acids, said acid being added in an amount sufficient to increase the tensile strength of the glass-containing polyolefin resin after curing to a tensile strength greater than the tensile strength of the glass-containing cured resin in the absence of said acid, and molding said mixture to cure said uncured resin, and to incorporate said glass in said cured resin in reinforcing relationship.