Polyurea-urethane cord treatment for power transmission belt and belt
AssigneeThe Gates Corporation
InventorsJoseph R. Duke, Jr., John Graeme Knox
Life of this patent
Estimating the term…
Abstract
A belt with a tensile cord embedded in an elastomeric body, having a polyurea-urethane adhesive composition impregnating the cord and coating the fibers. The composition is reaction product of a polyurethane prepolymer and a diamine curative or water. The prepolymer is a reaction product of a compact, symmetric diisocyanate and a polyester, polyether, or polycarbonate polyol. The belt body may be of cast polyurethane, vulcanized rubber, or thermoplastic elastomer. The cord may have an adhesive overcoat.
Claims31
A power transmission belt comprising:
- an elastomeric body, and a twisted tensile cord embedded in the elastomeric body;
- with the tensile cord impregnated with a crosslinked polyurea-urethane composition different from said elastomeric body comprising the polyurea reaction product of:
- a polyurethane prepolymer;
- and
- a curative selected from the group consisting of diamines and water.
A twisted tensile cord wound on a spool for subsequent use in reinforcing an elastomeric article;
- with at least a portion of said cord impregnated with a crosslinked 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 and water.
A method comprising:
- mixing a dip comprising a polyurethane prepolymer in an inert non-aqueous solvent;
- dipping a filament yarn in said dip;
- drying said dipped filament yarn to remove said solvent;
- and
- curing to some degree said prepolymer in the presence of water;
- whereby is provided a tensile cord at least partially impregnated with a crosslinked polyurea-urethane composition;
- and
- embedding said tensile cord in an elastomeric power transmission belt body.
A method comprising:
- mixing in an inert non-aqueous solvent a dip comprising:
- a polyurethane prepolymer with blocked isocyanate end groups, and a polyamine curative;
- dipping a filament yarn in said dip;
- drying said dipped filament yarn to remove said solvent;
- and
- curing to some degree said prepolymer;
- whereby is provided a tensile cord at least partially impregnated with a crosslinked polyurea-urethane composition;
- and
- embedding said tensile cord in an elastomeric power transmission belt body.
Dependencies are inferred from the claim text.