Title:
NEW OPTICAL MATERIAL
Document Type and Number:
Japanese Patent JPS58164611
Kind Code:
A
Abstract:
PURPOSE: An optical material excellent in light transmission, free of deformation due to stress relaxation at low temperatures and good in durability, comprising a specified fluorocarbon polymer composed of hard and soft segments.
CONSTITUTION: The titled optical material having ≥30wt% fluorine content comprises a fluorocarbon block copolymer composed of (A) below 70mol% hard segment consisting of a fluorocarbon polymer [e.g., tetrafluoroethylene (co)polymer] which is crystalline and has a melting temperature of about 100W 300°C and (B) below 30mol% soft segment consisting of an amorphous fluorocarbon polymer [e.g., vinylidene fluoride/hexafluoroethylene (co)polymer] and having a fluorine content of above 20wt%.
Inventors:
OOMORI AKIRA
TOMIHASHI NOBUYUKI
TATEMOTO MASANAGA
TOMIHASHI NOBUYUKI
TATEMOTO MASANAGA
Application Number:
JP4849982A
Publication Date:
September 29, 1983
Filing Date:
March 25, 1982
Export Citation:
Assignee:
DAIKIN IND LTD
International Classes:
G02C7/04; C08F293/00; C08F295/00; C08F297/00; G02B1/04; G02B6/00; (IPC1-7): C08F293/00; G02B1/04; G02B5/14
Domestic Patent References:
| JPS476193A | ||||
| JPS533495A | 1978-01-13 |
Attorney, Agent or Firm:
Eiji Saegusa