Method of preparing an optical polymerizate

Details Method of preparing an optical polymerizate Method of preparing an optical polymerizate

1998-03-09

1999-08-03

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...

359241, 524 89, 524110, 524112, 524190, 524715, 524719, 524751, 524753, C08G 1842

Patent

active

059326816

ABSTRACT:
Describes a method of preparing a polymerizate by polymerizing a two-component organic composition comprising: a first component containing a polyfunctional reactant having two or more functional groups selected from isocyanate, isothiocyanate and combinations of isocyanate and isothiocyanate groups; and a second component containing a polythiol represented by the following general formula I, ##STR1## wherein R.sub.1 and R.sub.2 are each selected from the group consisting of straight or branched chain alkylene, e.g., methylene and ethylene, cyclic alkylene, phenylene and C.sub.1 -C.sub.9 alkyl substituted phenylene. The second component may also optionally contain a reactive hydrogen compound that is different than the polythiol of general formula I. Polymerizates prepared according to the present invention are useful as ophthalmic lenses and have a refractive index of at least 1.57, an Abbe number of at least 33 and an initial Barcol hardness of at least 1. Also described are photochromic articles prepared from such polymerizates.

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