Urethane adhesive cord treatment for power transmission belt and belt
AssigneeThe Gates Corporation
InventorsWilliam W.L. Wu, Cathy Peake Wilson, Joseph R. Duke, JR.
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Abstract
A belt with a tensile cord embedded in an elastomeric body, having an adhesive composition impregnating the cord and coating the fibers. The adhesive composition is the reaction product of a polyisocyanate and a polyol, or a polyurethane prepolymer derived therefrom, and a polyamine curative and optionally additional polyol, and with optionally added plasticizer. At least one of the polyisocyanate, the prepolymer, and the polyamine are blocked with a blocking agent. The belt body may be of cast polyurethane, vulcanized rubber, or thermoplastic elastomer. The cord may have an adhesive overcoat.
Claims28
A belt comprising:
- an elastomeric body, and a tensile cord embedded in the elastomeric body;
- with the tensile cord impregnated with an adhesive composition comprising the reaction product of:
- a polyisocyanate and a first polyol or a polyurethane prepolymer comprising said polyisocyanate and said first polyol;
- and
- at least one curative selected from the group consisting of diamines, triamines, and tetramines;
- wherein at least one of said polyurethane prepolymer, said polyisocyanate and said curative has its reactive groups blocked by a blocking agent.
A method of preparing a belt comprising a reinforced elastomeric body, said method comprising:
- providing a tensile cord impregnated with an adhesive composition comprising the reaction product of;
- a polyisocyanate and a first polyol or a polyurethane prepolymer comprising said polyisocyanate and said first polyol;
- and
- at least one curative selected from the group consisting of diamines, triamines, and tetramines;
- wherein at least one of said polyurethane prepolymer, said polyisocyanate and said curative has its reactive groups blocked by a blocking agent;
- and
- embedding the impregnated tensile cord into the elastomeric body of the belt.
A tensile cord for reinforcing an elastomeric article;
- with at least a portion of said cord impregnated with a polyurea-urethane composition comprising the reaction product of:
- a polyurethane prepolymer comprising the reaction product of a polyisocyanate and at least one polyol selected from polyester polyols, polycarbonate polyols, and polyether polyols;
- and
- a chain extender selected from diamines, triamines, and tetramines;
- and
- wherein the reactive groups of at least one of said prepolymer and said chain extender are blocked with a blocking agent.
Dependencies are inferred from the claim text.