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:
Oct. 19, 1999
Filed:
Aug. 03, 1998
Gary Richard Tompkin, Copley, OH (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
The present invention relates to a hydrophilic nitrile rubber which is particularly useful in making photopolymer formulations for printing plates utilized in flexographic printing applications. The hydrophilic nitrile rubber of this invention is made by treating a standard carboxylated nitrile rubber with a sulfur trioxide/dimethylformamide complex. This invention more specifically discloses a process for preparing a hydrophilic nitrile rubber composition which is particularly useful in making photopolymer formulations for printing plates, said process comprising the steps of (1) reacting a carboxylated nitrile rubber with a complex of sulfur trioxide and dimethylformamide to produce a nitrile rubber containing sulfonated carboxyl groups and (2) reacting the nitrile rubber containing sulfonated carboxyl groups with a salt selected from the group consisting of sodium hydroxide and potassium hydroxide to produce the hydrophilic nitrile rubber.