The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2012
Filed:
Mar. 05, 2007
Kouhei Tomari, Kitakyushu, JP;
Yasuji Shichijo, Kitakyushu, JP;
Kouhei Tomari, Kitakyushu, JP;
Yasuji Shichijo, Kitakyushu, JP;
Nippon Steel Chemical Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a volume phase hologram recording material characterized by excellent photosensitivity, low cure shrinkage, high transparency, and particularly good storage stability and also disclosed is a recording medium prepared therefrom. Further disclosed is a photosensitive resin composition for volume phase hologram recording that comprises a soluble aromatic copolymer (A), a photoradically polymerizable compound (B) capable of copolymerizing with the soluble aromatic copolymer (A), a photopolymerization initiator (C), and a polymer binder (D). The soluble aromatic copolymer (A) has a structural unit of a divinyl aromatic compound and a structural unit of a monovinyl aromatic compound, comprises 10 to 90 mol % of a structural unit represented by the following formula (a1), has a hydroxyl equivalent of 100 to 30,000 g/equiv, a number average molecular weight (M) of 400 to 30,000, and a molecular weight distribution (M/M) of 10 or less, and accounts for 5 to 60 wt % of the composition.