Process for the production of polyurethane lens

Details Process for the production of polyurethane lens Process for the production of polyurethane lens

1995-11-20

1997-06-03

Gorr, Rachel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 65, 528 73, 528 81, 528 85, 351159, 252582, 264 11, 523303, C08G 1816

Patent

active

056355807

ABSTRACT:
The present invention relates to a process for the production of a polyurethane lens, which comprises the step (a) of providing a polyisocyanate compound and two or more polythiol compounds which have different reaction rates with the polyisocyanate compound and adding an alkyltin halide compound to the above polyisocyanate compound, and, after the step (a), the step (b) of mixing the polyisocyanate compound and the two or more polythiol compounds together with the alkyltin halide compound of the general formula (I) to allow them to react, and obtaining a polyurethane lens.

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