Abstract Improvement in adhesion of articles, e.g. tire cord of ethylene terephthalate or 2,6-naphthalate polyester to rubbers. The article is coated with a polyester polyurethane polymer containing segments derived from an ethylene terephthalate or 2,6-naphthalate polyester. Ratio of said segments to the balance in the polyurethane is 1:6 to 6:1. The article is then baked. Preferred coating agents for articles of an ethylene terephthalate polyester contain ethylenical unsaturations unsaturations and/or segments derived from an ethylene terephthalate polyester modified by a chain branching agent, e.g. pentaerythritol, and having a reduced viscosity of 0.1 to 0.3. Introduction of alkali metal sulfonate groups to the polyurethane is advantageous.
The bonded article of claim 1 wherein the crystalline polyester is an ethylene terephthalate polyester.
Claim 2
Dependent Claim
14 words
The bonded article of claim 1 wherein the polyester-polyurethane contains alkali metal sulfonate groups.
Claim 3
Dependent Claim
28 words
The bonded article of claim 3 wherein the polyester-polyurethane contains said alkali metal sulfonate groups in an amount, calculated as sulfur, of 0.05 to 4.0 percent by weight.
Claim 4
Dependent Claim
38 words
The bonded article of claim 1 wherein the polyester-polyurethane contains ethylene terephthalate polyester segments modified by up to 1.5 mol percent, based on the terephthalic acid component, of a chain branching agent having three or four ester-forming groups.
Claim 5
Dependent Claim
32 words
The bonded article of claim 5 wherein the modified polyester segments are derived from a modified polyethylene terephthalate having a reduced viscosity of 0.10 to 0.30 measured at 35* C. in o-chlorophenol.
Claim 6
Dependent Claim
25 words
The bonded article of claim 5 wherein the weight ratio of the modified polymer to the remainder of the polyester-polyurethane is from 1:4 to 4:1.