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:
Feb. 26, 2013
Filed:
Mar. 15, 2007
Tatsuya Makino, Ibaraki, JP;
Atsushi Takahashi, Ibaraki, JP;
Toshihiko Takasaki, Ibaraki, JP;
Tomoaki Shibata, Ibaraki, JP;
Masami Ochiai, Ibaraki, JP;
Tatsuya Makino, Ibaraki, JP;
Atsushi Takahashi, Ibaraki, JP;
Toshihiko Takasaki, Ibaraki, JP;
Tomoaki Shibata, Ibaraki, JP;
Masami Ochiai, Ibaraki, JP;
Hitachi Chemical Company, Ltd., Tokyo, JP;
Abstract
The present invention relates to a phenoxy resin for an optical material obtained by subjecting at least one selected from specific difunctional epoxy resins and at least one selected from specific difunctional phenols to polyaddition reaction, wherein a film comprising the above phenoxy resin has a refractive index of 1.580 or less at 25° C. and a wavelength of 830 nm, a resin composition for an optical material containing the above phenoxy resin, a resin film for an optical material comprising the above resin composition and an optical waveguide produced by using the above resin composition and/or the above resin film. The present invention can provide a phenoxy resin for an optical material which is excellent in a heat resistance and a transparency and which has a low refractive index, a resin composition for an optical material containing the above phenoxy resin, a resin film for an optical material comprising the above resin composition and an optical waveguide produced by using the above resin composition and/or the above resin film.