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US 6,130,307 AGranted
Composition for a resin
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsAkikazu Amagai, Motoharu Takeuchi, Katsuyuki Mizuno
Life of this patent
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Abstract
A composition for a resin comprising (a) a sulfur-containing compound having in one molecule one or more episulfide groups and/or epoxy groups and (b) a compound having in one molecule one or more isocyanate groups and/or thioisocyanate groups. The composition is useful as an optical material such for a plastic lens for glasses, since the composition exhibits an excellent balance between refractivity index and Abbe number and has a high impact resistance.
Claims19
A composition for a resin which comprises:
- (a) a compound having in one molecule one or more structures represented by the following formula (1):
- ##STR3## wherein R.sup.1 represents a hydrocarbon group having 1 to 10 carbon atoms,
- R.sup.2, R.sup.3 and R.sup.4 each represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms and
- X represents S or O;
- and
- (b) a compound having in one molecule at least one group selected from the group consisting of an isocyanate group and a thioisocyanate group;
- wherein a ratio ((II)/(I)) of a total number (II) of the isocyanate group and the thioisocyanate group in compound (b) to a total number (I) of an episulfide group and an epoxy group in compound (a) is 0.05:1 to 2.0:1.
4 more elements
Dependencies are inferred from the claim text.