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:
Jun. 09, 2015
Filed:
Apr. 17, 2013
Ppg Industries Ohio, Inc., Cleveland, OH (US);
Charles R. Hickenboth, Cranberry Township, PA (US);
Federico Menta, Pittsburgh, PA (US);
Nina V. Bojkova, Monroeville, PA (US);
PPG Industries Ohio, Inc., Cleveland, OH (US);
Abstract
Provided is a polymerizable composition of (a) a monomer composition including ethylenically unsaturated monomer having a β-epithiopropyl functional group; (b) optionally, a compound having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups; (c) an isourea functional polymerization initiator; and (d) a catalyst for reaction between the β-epithiopropyl functional groups. Also provided is a method of reducing the yellowness index of a sulfur-containing polymerizate prepared by addition polymerization, the method including reacting in the presence of an isourea functional polymerization initiator and a catalyst for reaction between β-epithiopropyl functional groups, a polymerizable composition of: (a) a monomer composition including ethylenically unsaturated monomer having a β-epithiopropyl functional group; and, optionally, (b) a compound having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups.