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US Patent 7781124 Hologram recording material

Patent 7781124 was granted and assigned to Nitto Denko on August, 2010 by the United States Patent and Trademark Office.

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Current Assignee
Nitto Denko
Nitto Denko
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7781124
Date of Patent
August 24, 2010
Patent Application Number
11631189
Date Filed
April 6, 2006
Patent Primary Examiner
‌
Martin J. Angebranndt
Patent abstract

The present invention provides a hologram recording material which can modulate its refractive index effectively with visible light laser and is excellent also in transparency after this modulation. The present invention relates to a hologram recording material comprising a polymer (A) having a radically polymerizable side chain vinyl group in the molecule thereof, said polymer (A) being a polymer of monomers comprising as an essential component an acryl-vinyl monomer represented by the following formula (1):CH2═C(R1)C(═O)O—R2═CH2  (1)wherein R1 represents a hydrogen atom or methyl group, and R2 represents a saturated or unsaturated hydrocarbon group having 1 to 20 carbon atoms, which may contain hetero atoms or halogen atoms in the molecule thereof; and a photopolymerization initiation source (B) which generates an active seed by visible light, and particularly relates to a hologram recording material having the aforementioned constitution in which the aforementioned photopolymerization initiation source (B) is a photopolymerization initiator which absorbs visible light to generate an active seed or a mixture of visible light-sensitizing dye and photopolymerization initiator.

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