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:
Nov. 09, 1993
Filed:
Nov. 16, 1990
Shuhei Shiraishi, Mishima, JP;
Shigeyuki Harada, Numazu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A thermal image transfer recording medium is disclosed, which comprises a support; a releasing layer formed on the support, comprising a wax component; and a thermal image transfer layer formed on the releasing layer, comprising a copolymer prepared from an alkylmethacrylate and a (meth)acrylonitrile, optionally in addition thereto a vinyl monomer, with a glass transition temperature of 30.degree. C. or more, and a coloring agent, the thermal image transfer layer having fine cracks having a length of 0.8 to 8 .mu.m with the number thereof being 25 to 100 per 1000 .mu.m.sup.2 on the surface thereof. In this recording medium, the thermal image transfer layer may further comprise a crosslinked acrylic resin with a glass transition temperature of 10.degree. C. or more and a number average molecular weight of 1,000,000 or more. Furthermore, an auxiliary thermal image transfer layer comprising a thermoplastic resin with a glass transition temperature of 30.degree. C. or more may also be interposed between the releasing layer and the thermal image transfer layer.