Title:
PRODUCTION OF HIGH REFRACTIVE INDEX RESIN
Document Type and Number:
Japanese Patent JPH03143905
Kind Code:
A
Abstract:
PURPOSE:To obtain a resin having a high refractive index and a low dispersion, being odorless and improved in transparency, weathering resistance, etc., by polymerizing a thiocarboxylic ester monomer having a (meth)acryloylthio group in the presence of an isocyanate compound. CONSTITUTION:A thiocarboxylic ester monomer (a) having at least one (meth) acryloylthio group in the molecule, which is desirably a compound of formula I or II [wherein R<1> is H or CH3; R<2> and R<3> are each H or an alkyl; R<4> is H, an (un)substituted alkyl, an (un)substituted aryl or an (un)substituted aralkyl; m >=0; A is any one of formulas III-VII; X is 0 or S; and n1 to n3 are each >=0], e.g. methyl thioacrylate, is reacted at 0-100 deg.C for 10min to 48hr in the presence of 0.0001-1 pt.wt., per 100 pts.wt. component (a), isocyanate compound (b) having at least one NCO group in the molecule (e.g. 2-isocyanatoethyl methacrylate), and the product is polymerized in the presence of optionally component (b).
Inventors:
MATSUOKA SHINGO
AMANO MASAHIRO
KIDA YASUJI
AMANO MASAHIRO
KIDA YASUJI
Application Number:
JP27965889A
Publication Date:
June 19, 1991
Filing Date:
October 30, 1989
Export Citation:
Assignee:
TOKUYAMA SODA KK
International Classes:
G02B1/04; C08F2/44; C08F8/30; C08F20/10; C08F20/38; C08F290/00; C08F290/06; C08G18/04; (IPC1-7): C08F2/44; C08F8/30; C08F20/38; C08G18/04; G02B1/04