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1. (WO2013163532) POLYMERIZABLE COMPOSITIONS CONTAINING ETHYLENICALLY UNSATURATED MONOMERS HAVING EPISULFIDE FUNCTIONAL GROUPS AND RELATED METHODS

Pub. No.:    WO/2013/163532    International Application No.:    PCT/US2013/038392
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Sat Apr 27 01:59:59 CEST 2013
IPC: C08F 220/38
C08F 222/10
G02B 1/10
Applicants: PPG INDUSTRIES OHIO, INC.
Inventors: HICKENBOTH, Charles R.
MENTA, Frederico
BOJKOVA, Nina V.
Title: POLYMERIZABLE COMPOSITIONS CONTAINING ETHYLENICALLY UNSATURATED MONOMERS HAVING EPISULFIDE FUNCTIONAL GROUPS AND RELATED METHODS
Abstract:
Provided is a polymerizable composition of (a) a monomer composition including ethylenically unsaturated monomer having a epithiopropyl functional group; (b) optionally, a compound having two or more epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups; (c) an isourea functional polymerization initiator; and (d) a catalyst for reaction between the -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 -epithiopropyl functional groups, a polymerizable composition of: (a) a monomer composition including ethylenically unsaturated monomer having a epithiopropyl functional group; and, optionally, (b) a compound having two or more epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups.