Resin for optical material
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsAkikazu Amagai, Masanori Shimuta, Motoharu Takeuchi, Katsuyuki Mizuno
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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.
Claims17
A resinous composition which comprises
- (a) a compound having, in one molecule, one or more structures each having a three-membered rind represented by the formula (1) ##STR4## 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 is 50% or more on the average with respect to the total of S and O constituting the three-membered ring,
- and (b) a compound having one or more SH groups in one molecule,
- a ratio of the total mol number of the SH group in the compound (b) to the total mol number of an episulfide group or an epoxy group in the compound (a) being 0.001 to 0.5.
A resinous composition which comprises
- (a) a compound having, in one molecule, one or more structures each having a three-membered ring represented by the formula (1) ##STR5## 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 is 50% or more on the average with respect to the total of S and O constituting the three-membered ring,
- and (b) a compound having one or more SH groups in one molecule,
- a ratio of the total mol number of the SH group in the compound (b) to the total mol number of an episulfide group and an epoxy group in the compound (a) being 0.001 to 0.5.
Dependencies are inferred from the claim text.