US Patent 7989389 Heat-sensitive recording material

Patent 7989389 was granted and assigned to RICOH COMPANY,LTD. on August, 2011 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

79893890

Patent Inventor Names

Kazuyuki Uetake0

Yoshikazu Kaneko0

Michiyo Fukushima0

Kunihiko Hada0

Date of Patent

August 2, 2011

Patent Application Number

120468410

Date Filed

March 12, 2008

Patent Primary Examiner

‌

Bruce H. Hess

Patent abstract

The present invention provides a heat-sensitive recording material having a support, a heat-sensitive color-developing layer containing a leuco dye and a developer, and a protective layer, the heat-sensitive color-developing layer and the protective layer being formed on the support, wherein carboxylic-acid-modified polyvinyl alcohol with a weight average degree of polymerization of 100 to 400 and a modification degree of 0.2 mol % to 1.0 mol % is used as a dispersing agent for dispersing the leuco dye.

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