Rubber containing microencapsulated antidegradants

US4895884A · kind A · utility

Assignee

• The Goodyear Tire & Rubber Company · US

Inventors

• David Andrew Benko · Munroe Falls, US
• Larry R. Evans · Colora, US
• James Gregory Gillick · Akron, US
• Walter H. Waddell · Pasadena, US
• Barbara A. Metz · Baltimore, US
• Benjamin F. Benton · Centerburg, US
• Gordon E. Pickett · Reynoldsburg, US
• William R. Krumm · Reynoldsburg, US

Key dates

• Filing date: Oct 6, 1987
• Grant date: Jan 23, 1990
• Expiry date: Oct 6, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K9/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.