Resin for optical material

Details Resin for optical material Resin for optical material

1998-04-20

2000-09-12

Dawson, Robert

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523456, 523461, 528377, 528374, 528406, C08G 5922, C08G 5930, C08G 5932, C08G 5966

Patent

active

06117923&

ABSTRACT:
A resinous composition which comprises a compound having, in one molecule, one or more structures of the formula (1) ##STR1## wherein R.sup.1 is a hydrocarbon having 1 to 10 carbon atoms; R.sup.2, R.sup.3 and R.sup.4 are each hydrogen or a hydrocarbon group having 1 to 10 carbon atoms; and X is S or O, and a ratio of S to the total of S and O constituting the three-membered ring is 50% or more on the average; and another compound having one or more SH groups in one molecule. The resinous composition can be used for an optical material having improved oxidation resistance.

REFERENCES:
patent: 5369141 (1994-11-01), Coleman et al.
patent: 5374668 (1994-12-01), Kanemura et al.
patent: 5548026 (1996-08-01), Jorissen et al.
patent: 5807975 (1998-09-01), Amagai et al.

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