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:
Jan. 23, 1996
Filed:
Sep. 15, 1993
Ging-Ho Hsiue, Hsinchu, TW;
Jow-Tsong Shy, Hsinchu, TW;
Jang-Jeng Liang, Taoyuan, TW;
Wen-Chang Chiang, Taoyuan, TW;
National Science Council, Taipei, TW;
Abstract
An optically erasable read-and-write liquid crystal/side-chain liquid crystalline polymer composition, and method of making recordation on the same, are disclosed. The liquid crystal/side-chain liquid crystalline polymer composition of the present invention comprises: (1) from 45% to 85% of a nematic type ester-based liquid crystal and (2) from 15% to 55% of side-chain polymethylsiloxane liquid crystalline polymer having a molecular weight between about 4,000 to 10,000. The side-chain polymethylsiloxane polymer is prepared by graft-polymerization of a biphenyl derivative having a terminal saturated or unsaturated alkyl group, which can be either symmetrical or asymmetrical, with a polymethylsiloxane to form the liquid crystal side-chain polymethylsiloxane polymer of the present invention. Data are recordable on the recording medium of the present invention using a laser beam heating, and are erasable by applying an external electrical field.