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. 12, 1991
Filed:
Feb. 13, 1990
Applicant:
Inventors:
Masao Kubo, Toyama, JP;
Akihiro Shiroishi, Tokyo, JP;
Ikuo Uno, Kobe, JP;
Takashi Nishiyama, Akou, JP;
Assignees:
Nissan Chemical Industries, Ltd., Tokyo, JP;
Shionogi & Co. Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
10628734 ; 423339 ;
Abstract
Disclosed herein is a filler for heat-sensitive recording paper which comprises amorphous silica obtained by reacting hydrosilicofluoric acid and/or an alkali salt thereof with an alkali (such as ammonia and dimethylamine). The filler has a solid acid strength (pk.sub.a) of +6.8 to 3.3, and oil absorption value of 120 to 200 ml/100 g, a nitrogen adsorption specific surface area of 110 to 350 m.sup.2 /g (by BET method), and a water vapor adsorption specific surface area of 200 to 300 m.sup.2 /g (by BET method).