US 9,434,199 B2Granted

Thermal recording material

AssigneeFine Ace Corporation

InventorKazuo Kabashima

Life of this patent

Estimating the term…

Loading patent…

Abstract

A thermal recording material having both of excellent coloring property and storage stability with a low cost is provided. The thermal recording material contains a leuco dye and a developer in a coloring layer, and the developer contains 2,4′-dihydroxydiphenylsulfone and 4,4′-dihydroxydiphenylsulfone with a specific ratio, and the above-mentioned two kinds of the dihydroxydiphenylsulfones are made a material obtained by sequentially undergoing a separating step for heightening the weight ratio of a 2,4′ material from a dichlorodiphenylsulfone mixture containing the 2,4′ material and a 4,4′ material, a reaction step of hydrolyzing the mixture to obtain a dihydroxydiphenylsulfone mixture, and a post-treatment step of subjecting to decolorization and purification.

Claims17

Dependent claims

A thermal recording material comprising:

a support and a coloring layer containing a colorless or pale colored dye precursor and a developer provided thereon, wherein the developer contains 2,4′-dihydroxydiphenylsulfone and 4,4′-dihydroxydiphenylsulfone, and
a weight ratio of the 2,4′-dihydroxydiphenylsulfone and the 4,4′-dihydroxydiphenylsulfone is within a range of exceeding 50/50 and 95/5 or less,
wherein the 2,4′-dihydroxydiphenylsulfone and the 4,4′-dihydroxydiphenylsulfone comprises 2,4′-dihydroxydiphenylsulfone and 4,4′-dihydroxydiphenylsulfone obtained by sequentially undergoing:
a separating step of obtaining a second mixture where a weight ratio of 2,4′-dichlorodiphenylsulfone is heightened from a first mixture containing the 2,4′-dichlorodiphenylsulfone and 4,4′-dichlorodiphenylsulfone,
a reaction step of reacting the second mixture to obtain a third mixture containing the 2,4′-dihydroxydiphenylsulfone and the 4,4′-dihydroxydiphenylsulfone, and
a post-treatment step of decolorizing and purifying the third mixture.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/386,657Filed 19 Mar 2013
Priority: JP 2012-06422621 Mar 2012
Published: US 2015/0051070 A119 Feb 2015
Granted: 6 Sep 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B41M 5/3336
Compounds containing phenolic or carboxylic acid groups or metal salts thereof: sulfur compounds, e.g. sulfones, sulfides, sulfonamides
B41M 5/3375
Additives; Binders: non-macromolecular compounds
C07C 315/04
Preparation of sulfones; Preparation of sulfoxides: by reactions not involving the formation of sulfone or sulfoxide groups
C07C 317/22
Having sulfone or sulfoxide groups and singly-bound oxygen atoms bound to the same carbon skeleton: with sulfone or sulfoxide groups bound to…

Family

US 2015/0051070 A1Pre-grant publication · published 19 Feb 2015
US 9,434,199 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key