Ying Tang

US Patent:

7250451, Jul 31, 2007

Filed:

Mar 9, 2004

Appl. No.:

10/796531

Inventors:

Ying Tang - Jacksonville FL, US

Assignee:

American Rubber Technologies, Inc. - Jacksonville FL

International Classification:

C08J 11/04

US Classification:

521 41, 521 415

Abstract:

A process for reclaiming sulfur-cured, vulcanized rubber by combining finely ground scrap vulcanized rubber within a specialized, twin-screw extruder capable of providing strong shearing and just-on-time mixing; adding a reclaiming agent to the extruder; and masticating the rubber scrap and reclaiming agent within the extruder until the rubber scrap is devulcanized. The present invention also discloses a unique composition of reclaiming agent, which preferably includes the following compounds: accelerators TBBS, ZMBT, MBT, and TMTM; activators zinc oxide and stearic acid; and zinc salts of fatty acids and sulfur. The reclaimed rubber is suitable for use in producing high-grade, rubber products without adding a binder, or for combining with fresh rubber compounds to produce high-specification rubber products.

US Patent:

6590042, Jul 8, 2003

Filed:

Oct 3, 2001

Appl. No.:

09/970177

Inventors:

Ying Tang - Jacksonville FL 32220

International Classification:

C08J 1104

US Classification:

5253326, 5253335, 5253336, 525343, 525353, 521 43, 521 42, 521 415

Abstract:

A process for reclaiming sulfur-cured, vulcanized rubber by combining finely ground scrap vulcanized rubber within a specialized, twin-screw extruder capable of providing strong shearing and just-on-time mixing; adding a reclaiming agent to the extruder; and masticating the rubber scrap and reclaiming agent within the extruder until the rubber scrap is devulcanized. The present invention also discloses a unique composition of reclaiming agent, which preferably includes the following compounds: accelerators TBBS, ZMBT, MBT, and TMTM; activators zinc oxide and stearic acid; and zinc salts of fatty acids and sulfur. The reclaimed rubber is suitable for use in producing high-grade, rubber products without adding a binder, or for combining with fresh rubber compounds to produce high-specification rubber products.