Recycled rubber products
AssigneeRyvec, Inc.
InventorPeter Kvesic
Life of this patent
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Abstract
Recycled rubber products are made in a two step process. In the first step, ground rubber is treated with a polyurethane binder to make a treated rubber. In the second step, the treated rubber is mixed with additional polyurethane binder and molded into finished products. This method uses less polyurethane binder than the conventional process, but the products have higher tensile strengths. The molding time is also reduced because of the reduced amount of polyurethane binder used.
Claims17
A method of making recycled rubber products with less polyurethane binder reduced curing times, and high tensile strengths compared with equivalent products made by known polyurethane binder methods, the method comprising
- a treatment step comprising mixing ground rubber with a first polyurethane binder until the first polyurethane binder is reacted and the rubber is free of clumps, and
- a forming step comprising mixing the product of the treatment step with a second polyurethane binder and molding the resulting mixture.
A method of making a composite of ground rubber and polyurethane comprising
- preparing a treated rubber by mixing ground rubber with a first polyurethane binder at an elevated temperature until the first polyurethane binder is reacted and the rubber is free of clumps, and
- mixing the treated rubber with a second polyurethane binder and molding the resulting mixture at elevated temperature and pressure.
A recycled rubber product with less polyurethane binder, reduced curing time, and high tensile strength compared with equivalent products made by known polyurethane binder methods, made by a method comprising
- a treatment step comprising mixing ground rubber with a first polyurethane binder until the first polyurethane binder is reacted and the rubber is free of clumps, and
- a forming step comprising mixing the product of the treatment step with a second polyurethane binder and molding the resulting mixture.
Polyurethane treated rubber particles comprising rubber particles coated with a cured polyurethane binder, wherein the treated rubber particles comprise from about 0.25% to about 1.5% by weight of the polyurethane binder.
Dependencies are inferred from the claim text.