TREA

Composition for optical materials and use thereof

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Information

  • Patent Grant
  • 5652321
  • Patent Number
    5,652,321
  • Date Filed
    Monday, October 30, 1995
    28 years ago
  • Date Issued
    Tuesday, July 29, 1997
    26 years ago
Information
Abstract
A composition for optical materials is herein disclosed which comprises the following two components (a) and (b):(a) a component containing at least one of poly isocyanates represented by the formula (1)A.paren open-st.S--B--NCO).sub.n (1)wherein A is an alkanediyl group or an alkanetetrayl group which may contain a sulfur atom, or a dithianetetrayl group, and the alkanediyl group or the alkanetetrayl group may be substituted by a phenyl group; B is a methylene chain represented by .paren open-st.CH.sub.2 .paren close-st..sub.m (m is an integer of 1 to 4) which may contain a sulfur atom, and B's may be the same or different; and n is an integer of 2 or 4, and(b) a component containing at least one of polythiols having two or more mercapto groups. The composition is useful to provide optical products such as plastic lenses, filters, substrates for recording media and optical fibers which have a very high refractive index and which are excellent in heat resistance.
Description
Claims
  • 1. A composition for optical materials which comprises the following two components (a) and (b):
  • (a) a component containing at least one of polyisocyanates represented by the following formula (1):
  • A.paren open-st.S--B--NCO).sub.n ( 1)
  • wherein A is an alkanediyl group or an alkanetetrayl group which may contain a sulfur atom, or a dithianetetrayl group, and the alkanediyl group or the alkanetetrayl group may be substituted by a phenyl group; B is a methylene chain represented by .paren open-st.CH.sub.2 .paren close-st..sub.m (m is an integer of 1 to 4) which may contain a sulfur atom, and Bs may be the same or different; and n is an integer of 2 or 4, and
  • (b) a component containing at least one of polythiols having two or more mercapto groups.
  • 2. The composition for optical materials according to claim 1 wherein the polyisocyanate is a polyisocyanate represented by the following formula (2):
  • OCN--B--S--X--S--B--NCO (2)
  • wherein X is a lower alkanediyl group having 1 to 4 carbon atoms which may contain a sulfur atom, and this alkanediyl group may be substituted by a phenyl group; and B is a methylene chain represented by .paren open-st.CH.sub.2 .paren close-st..sub.m (m is an integer of 1 to 4) which may contain a sulfur atom, and Bs may be the same or different.
  • 3. The composition for optical materials according to claim 1 wherein the polyisocyanate is a polyisocyanate represented by the following formula (3): ##STR6## wherein Y is a lower alkanetetrayl group or a dithianetetrayl group which may contain a sulfur atom.
  • 4. A plastic lens having a high refractive index obtained by polymerizing the composition for the optical materials described in claim 1.
  • 5. A plastic lens having a high refractive index obtained by polymerizing the composition for the optical materials described in claim 2.
  • 6. A plastic lens having a high refractive index obtained by polymerizing the composition for the optical materials described in claim 3.
Priority Claims (2)
Number Date Country Kind
6-283613 Nov 1994 JPX
6-289710 Nov 1994 JPX
US Referenced Citations (2)
Number Name Date Kind
4689387 Kajinoto et al. Aug 1987
5475074 Matsuoka et al. Dec 1995
Non-Patent Literature Citations (8)
Entry
Lesiak & Maciejewski; Chem. & Applications Aliphatic Isocyanatos; J. Prakt, Chem. (1993) [abstract] 335(3), 294-6.
Kogyo Kagaky Zasshi 68(9), 1752-6(1965), "Synthesis of Polyamides Containing Disulfide Bonds".
Journal fur praktische Chemie Chemiker-Zeitung (1993), "Synthesis of Aliphatic Diisocyanates Containing Oxygen or Sulphur Bridge in Polymethylene Chain", Lesiak et al.
Chemical Abstract vol. 114: 237395t (1991), "High-reference-index plastic lens".
Chemical Abstract vol. 121:108012m (1994), "Preparation of polyisocyanates of hydrocarbons as optical materials".
Chemical Abstract vol. 112: 159987e, "Resin for plastic lenas and its preparation". (1988).
Chemical Abstract vol. 118: 14474z (1993), "Preparation of polyisocycanates as optical materials and products".
Chemical Abstract vol. 119: 140072a, "Heat-resistant polyisocyanates and optical materials and products using the same". (1993).