Patent EP0094056A1 successfully refreshed from Google Patents.
EP0094056A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical materials
Assignee: Daikin Industries Ltd
•
Filing: 1983-05-06
•
Granted: —
•
Expires: 2003-05-06
Abstract
Abstract An optical material comprising a thermal resisting fluoro- al kylmethacrylate copolymer which essentially consists of (a) fluorine-containing methacrylate monomer unit of the formula wherein R f 1 represents a fluoroalkyl group having 1 to 3 carbon atoms and (b) a fluorine-containing acrylate monomer unit of the formula wherein R, and R 2 are the same or different and represents a hydrogen atom or a lower alkyl group and R f 2 represents a fluoroalkyl group having 1 to 3 carbon atoms.
Inventors
- 👤 Akira Ohmori
- 👤 Nobuyuki Tomihashi
- 👤 Takahiro Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 17:47
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; G02B1/045; G02B1/048; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
An optical material comprising a thermal resisting fluoroalkylmethacrylate copolymer which essentially consists of (a) fluorine-containing methacrylate monomer unit of the formula wherein R f 1 represents a fluoroalkyl group having 1 to 3 carbon atoms and (b) a fluorine-containing acrylate monomer unit of the formula wherein R 1 and R 2 are the same or different and represents a hydrogen atom or a lower alkyl group and R f 2 represents a fluoroalkyl group having 1 to 3 carbon atoms.
Claim 2
Dependent Claim
80 words
An optical material comprising a thermal resisting fluoroalkylmethacrylate copolymer which essentially consists of (a) fluorine-containing methacrylate monomer unit of the formula wherein R f 1 represents a fluoroalkyl group having 1 to 3 carbon atoms and (b) a fluorine-containing acrylate monomer unit of the formula wherein R 1 and R 2 are the same or different and represents a hydrogen atom or a lower alkyl group and R f 2 represents a fluoroalkyl group having 1 to 3 carbon atoms.
Claim 3
Dependent Claim
41 words
An optical material according to claim 1 wherein said fluoroalkylmethacrylate copolymer consist of about 70 to 99 mol % of the fluorine-containing methacrylate monomer unit (a) and about 1 to about 30 mol % of the fluorine-containing acrylate monomer unit (b).
Claim 4
Dependent Claim
18 words
An optical material according to claim 1 wherein R f 1 is trifluoromethyl-, pentafluoroethyl-, 1,1,2,2-tetrafluoroethyl or 1,1,2,3,3,3-hexafluoropropyl group.
Claim 5
Dependent Claim
18 words
An optical material according to claim 1 wherein R f 2 is trifluoromethyl-, pentafluoroethyl-, 1,1,2,2-tetrafluoroethyl- or 1,1,2,3,3,3-hexafluoropropyl group.
Claim 6
Dependent Claim
32 words
An optical material according to claim 1 wherein said fluoroalkylmethacrylate copolymer further contains up to about 25% by weight based on the weight of the copolymer of a methacrylate having no fluorine.
Claim 7
Dependent Claim
15 words
An optical material according to claim 5 wherein said methacrylate having no fluorine is methylmethacrylate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.