Optical urethane resins and plastic lenses comprising the same

Details Optical urethane resins and plastic lenses comprising the same Optical urethane resins and plastic lenses comprising the same

1992-03-20

1993-03-16

Welsh, Maurice J.

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 66, C08L 7504

Patent

active

051945592

ABSTRACT:
Optical urethane resins according to the present invention are each obtained by reacting an active hydrogen compound with an isocyanate compound containing as a stabilizer a phenolic compound. Owing to their low yellowness, high light transmittance and optical-strain-free quality, these resins are useful as optical materials for plastic lenses or the like which are required to be colorless, transparent and uniform.

REFERENCES:
patent: 3247236 (1966-04-01), Adams et al.
patent: 3715381 (1973-02-01), Spaunburgh et al.

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