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. 08, 1988
Filed:
Oct. 16, 1986
Applicant:
Inventors:
Akio Kurokawa, Kanagawa, JP;
Naoyuki Ifuku, Kanagawa, JP;
Kenzo Seita, Kanagawa, JP;
Youzi Nagata, Kanagawa, JP;
Assignee:
Mitsui Toatsu Chemicals, Inc., Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21D / ;
U.S. Cl.
CPC ...
162166 ; 1621816 ; 162167 ; 10628725 ; 10628734 ; 106401 ;
Abstract
A lightweight paper having a superior opacity and printing opacity is provided, which lightweight paper comprises dry pulp, 0.015 to 1.2% by weight based on the pulp of an alumina polymer and 0.5 to 30% by weight based on the pulp of a coaggregate formed from agglomerated particles of urea-formal-dehyde polymer (A) and agglomerated particles of hydrated silicic acid (B) in a ratio of (A):(B) of 5:95 to 95:5.