Episulfide compound
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsAkikazu Amagi, Nobuyuki Uemura, Motoharu Takeuchi, Kenichi Takahashi, Minoru Ohashi, Hiroshi Horikoshi, Masanori Shimuta
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Abstract
An episulfide which has an alicyclic, aromatic or heterocyclic skeleton and has two or more moieties represented by the formula ##STR1## wherein X is S or O, and S is in an amount of 50% or more, on the average, of the total of S and O constituting a three-membered ring. A cured material obtained by polymerizing this episulfide compound is a desirable optical material for various uses, particularly as a lens material for spectacles.
Claims17
An episulfide compound having two or more moieties represented by the following formula ##STR7## wherein X is S or O, and having a cyclic skeleton selected from the group consisting of
- (i) an alicyclic skeleton wherein the compound is selected from the group consisting of 1,3-bis(.beta.-epithiopropylthio)cyclohexane, 1,4-bis(.beta.-epithiopropylthio)cyclohexane, 1,3-bis(.beta.-epithiopropylthiomethyl)cyclohexane, 1,4-bis(.beta.-epithiopropylthiomethyl)cyclohexane, 2,5-bis(.beta.-epithiopropylthio)-1,4-dithiane and 2,5-bis(.beta.-epithiopropylthioethylthiomethyl)-1,4-dithiane;
- (ii) an aromatic skeleton wherein the compound is selected from the group consisting of 1,3-bis(.beta.-epithiopropylthio)benzene, 1,4-bis(.beta.-epithiopropylthio)benzene, 1,3-bis(.beta.-epithiopropylthiomethyl)benzene 1,4-bis(.beta.-epithiopropylthiomethyl)benzene;
- and
- (iii) a heterocyclic skeleton including a sulfur atom as a heteroatom and the compound is represented by the formula ##STR8## wherein Y is --(CH.sub.2 CH.sub.2 S), Z is a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or --(CH.sub.2).sub.m SY.sub.n E.sub.PS, U is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, m is an integer of 1 to 5, n is an integer of 0 to 4, and E.sub.PS is an epithiopropyl group of the formula ##STR9## wherein X is S or O, and S is in an amount of 50% or more, on the average, of the total of S and O constituting a three-membered ring.
Dependencies are inferred from the claim text.