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:
Jan. 23, 1990
Filed:
Oct. 06, 1987
David A Benko, Munroe Falls, OH (US);
Larry R Evans, Seville, OH (US);
James G Gillick, Akron, OH (US);
Walter H Waddell, Fairlawn, OH (US);
Barbara A Metz, Baltimore, OH (US);
Benjamin F Benton, Centerburg, OH (US);
Gordon E Pickett, Reynoldsburg, OH (US);
William R Krumm, Reynoldsburg, OH (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
There is disclosed the use of microencapsulated antidegradants in rubber and a process for the production of microencapsulated antidegradants. More specifically, this invention is directed to the cellulose acetate microencapsulation of para-phenylene diamine based antiozonants at wall to core ratios greater than 1:1 but less than 4:1. The microcapsules preferably have a particle diameter of less than 50 microns. The microencapsulated antidegradant prepared and used according to this invention provides long term protection to rubber articles that are subject to ozone and oxygen attack.