The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2018
Filed:
Apr. 15, 2016
Rubbintec, Sia, Jurmala, LV;
Leonid R. Vorobyev, Walnut Creek, CA (US);
Vladimir Borisovich Bosnik, Moscow, RU;
Rubbintec, SIA, Jurmala, LV;
Abstract
This invention relates to a composition for devulcanization of sulfur-cured rubber and a method of devulcanization of sulfur-cured rubber, and can be used to recycle used rubber articles. The composition for devulcanization of sulfur-cured rubber, which contains a devulcanizing agent for the selective destruction of sulfide bonds according to this invention, has a mixture of triphenylphosphine and 1,8-diazabicyclo[5.4.0]undec-7-ene at a weight ratio from 5:1 to 1:5 as the devulcanizing agent. Further, it contains a compatibilizer compatible with both the devulcanizing agent and the sulfur-cured rubber, at a weight ratio of the devulcanizing agent to the compatibilizer from 1:15 to 1:70. The devulcanizing agent breaks sulfide bonds in sulfur-cured rubber very effectively and selectively, while the experimentally selected compatibilizer ensures an effective penetration of the devulcanizing agent into the rubber crumbs. As a consequence, the required concentration of the devulcanizing agent in the resulting compounded rubber does not exceed 1% (preferably, 0.03-0.3%).