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:
Mar. 21, 1989
Filed:
Jun. 08, 1987
Yamada Chemical Co., Ltd., Kyoto, JP;
Abstract
Disclosed herein is a heat-sensitive recording material in which a chromogenic dye-procursor comprises: (A) a mixture comprising at least two divinyl phthalide compounds represented by the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 represent respectively alkyl group of 1 to 6 carbon atoms, alkyl group of 1 to 4 carbon atoms having an alkoxy group of 1 to 4 carbon atoms or cycloalkyl group of 5 to 7 carbon atoms, X.sup.1 and X.sup.2 represent respectively hydrogen atom, alkyl group of 1 to 8 carbon atoms, alkoxy group of 1 to 8 carbon atoms, alkoxy group of 1 to 4 carbon atoms having an alkoxy group of 1 to 4 carbon atoms, cycloalkoxy group of 5 to 7 carbon atoms, alkenyloxy group of 3 to 8 carbon atoms, benzyloxy group, substituted benzyloxy group, furfurloxy group, tetrahydrofurfuryloxy group, phenyl group, substituted phenyl group, phenoxy group, substituted phenoxy group, fluorine atom, chlorine atom or bromine atom, m and n represent 0 or integer of 1 to 4, m+n=4 and R.sup.1 and R.sup.2 may join together to form a heterocyclic ring, or (B) a mixture of the divinyl phthalide compound(s) represented by the formula (I) and at least one compound selected from the compounds represented by the formulas (II), (III) and (IV): ##STR2## wherein R.sup.3 -R.sup.14 represent alkyl group of 1 to 6 carbon atoms, alkyl group of 1 to 4 carbon atoms each having an alkoxy group of 1 to 4 carbon atoms, cycloalkyl group of 5 to 7 carbon atoms, phenyl group, substituted phenyl group or tetrahydrofurfuryl group, p and q represent 0 or integer of 1 to 4 p+q=4, X.sup.3 represents hydrogen atom, alkyl group of 1 to 4 carbons or chlorine atom, X.sup.4 and X.sup.5 respectively represent hydrogen atom, alkyl group of 1 to 4 carbon atoms, flurine atom, chlorine atom or trifluoromethyl group, R.sup.3 and R.sup.4, R.sup.5 and R.sup.6, R.sup.7 and R.sup.8, R.sup.9 and R.sup.10, R.sup.11 and R.sup.12, and R.sup.13 and R.sup.14 may join together to form heterocyclic rings.