Patent EP0128517A2 successfully refreshed from Google Patents.
EP0128517A2
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EP
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Optical material
Assignee: Daikin Industries Ltd
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Filing: 1984-06-06
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Granted: —
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Expires: 2004-06-06
Abstract
Abstract This invention relates to an optical material comprising a polymer which has a structural unit represented by the formulawherein X<sup>1</sup> and X<sup>2</sup> are the same or different and are each hydrogen or deuterium, and R<sup>1</sup> is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group (with or without a substituted lower alkyl group) having 3 to 6 carbon atoms or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms in an amount of at least 5 mole % of the polymer.
Inventors
- 👤 Akira Ohmori
- 👤 Nobuyuki Tomihashi
- 👤 Takahiro Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 21:00
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/22; G; G02; G02B; G02B1/00; G02B1/04; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
An optical material comprising a polymer which has a structural unit represented by the formula wherein X 1 and X 2 are the same or different and are each hydrogen or deuterium, and R 1 is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group (with or without a substituted lower alkyl group) having 3 to 6 carbon atoms or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms in an amount of at least 5 mole % of the polymer.
Claim 2
Dependent Claim
88 words
An optical material comprising a polymer which has a structural unit represented by the formula wherein X 1 and X 2 are the same or different and are each hydrogen or deuterium, and R 1 is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group (with or without a substituted lower alkyl group) having 3 to 6 carbon atoms or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms in an amount of at least 5 mole % of the polymer.
Claim 3
Dependent Claim
22 words
An optical material according to claim 1 wherein the polymer is a homopolymer having the structural unit represented by the formula (a).
Claim 4
Dependent Claim
105 words
An optical material according to claim 1 wherein the material comprises a copolymer consisting of at least 5 mole % of the structural unit represented by the formula (a) and not more than 95 mole % of a structural unit represented by the formula wherein R 2 is hydrogen or a chain hydrocarbon group having 1 to 5 carbon atoms, and R 3 is hydrogen, a chain hydrocarbon group having 1 to 5 carbon atoms or a cyclic hydrocarbon group (with or without substituted lower alkyl group) having 3 to 6 carbon atoms and said R 2 and R 3 may contain deuterium-substituted for hydrogen.
References Cited (Backward Citations)
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