Process of producing polythiol oligomer
AssigneeHoya Corporation
InventorsJian Jiang, Masahisa Kosaka
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Abstract
A process for producing a polythiol oligomer having disulfide linkages by reacting polythiol (with the functionality of two or above) with sulfur in a molar ratio of m to (m-1) (where m is an integer of 2 to 21) in the presence of a basic catalyst, whereby the oligomers produced have a degree of oligomerization of m (wherein m is defined as above). Specifically disclosed is a process for reacting 2,5-dimercaptomethyl-1,4-dithiane (DMMD) with sulfur in a molar ratio 2:1 or 3:2 in the presence of a basic catalyst, thereby producing an oligomer represented by the below formula: ##STR1## (wherein n is an integer of up to 21). Also disclosed are optical polymers made with the oligomer and optical materials and devices made with the polymer.
Claims27
A process for producing a polythiol oligomer, comprising reacting a polythiol (having a functionality of at least two) with sulfur in a molar ratio of m to (m-1) (where m is an integer of 2 to 21) in the presence of a basic catalyst such that the degree of oligomerization is m (where m is defined as above) under conditions sufficient to produce a polythiol oligomer having disulfide linkages.
A process comprising 2,5-dimercaptomethyl-1,4-dithiane (DMMD) with sulfur in a molar ratio 2:1 or 3:2 in the presence of a basic catalyst under conditions sufficient to cause a reaction to take place, thereby producing a polythiol oligomer.
An optical polymer formed by reacting a mixture comprising the following components (A), (B) and (C) under conditions sufficient for copolymerization to take place:
- (A) a polythiol group-containing component, including a polythiol oligomer (component a1) made by reacting 2,5-dimercaptomethyl-1,4-dithiane (DMMD) with sulfur in a molar ratio 2:1 or 3:2 in the presence of a basic catalyst
- (B) a polyisocyanate group-containing component, and/or
- (C) a polyfunctional vinyl group-containing component.
Dependencies are inferred from the claim text.