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US 4,462,855 AGranted
Process for bonding polyester reinforcement elements to rubber
AssigneeCelanese Corporation
InventorsAnthony W. Yankowsky, Harry W. Stanhope, Darrell D. Hicks
Life of this patent
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Abstract
Polyester reinforcement fibers are treated to improve adhesion to rubber by applying a dissolved aromatic urethane coating to the fibers followed by coating the fibers with a resorcinol-formaldehyde latex and then heating the fibers sufficiently to convert the aromatic urethane to an aromatic isocyanate and applying to and curing a layer of rubber on said treated polyester fibers.
Claims10
The process of bonding polyester reinforcement fibers to rubber consisting essentially of:
- providing polyester reinforcement fibers bearing a coating consisting essentially of an organic solution of a dissolved aromatic urethane having the formula Ar(NHCOX).sub.n wherein Ar is an organic residue containing at least one aromatic nucleus, X is a moiety selected from the group consisting of alkoxy, aryloxy and alkaryloxy and n is greater than about 2;
- said aromatic urethane exhibiting thermal disassociation at a temperature in the range of between 220.degree. F. and about 465.degree. F., thereby forming an aromatic isocyanate;
- said dissolved aromatic urethane solution additionally comprising a flexibilizing agent in an amount of between 5 and about 50 percent by weight based on the weight of said aromatic urethane and being substantially free of free isocyanate;
- coating said polyester reinforcement fibers bearing said dissolved urethane coating with a latex comprising resorcinol-formaldehyde resin, heating said latex coated fibers to a temperature in the range of between about 220.degree. F. and about 480.degree. F. and above the thermal disassociation temperature of said aromatic urethane, and applying to and curing a layer of rubber on said treated polyester reinforcement fibers.
1 more element
Dependencies are inferred from the claim text.