Inks and treating liquid mixture

Details Inks and treating liquid mixture Inks and treating liquid mixture

1998-09-02

2001-05-15

Hess, Bruce H. (Department: 1774)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S441000, C524S561000

Reexamination Certificate

active

06232395

ABSTRACT:

FIELD OF THE INVENTION
This invention is a paper treated with a material to improve printing on the paper by aqueous inks, such as inkjet inks.
BACKGROUND OF THE INVENTION
The print performance of current inkjet printers is heavily dependent on the type of plain paper used for printing. The print properties of color richness (gamut), dry time, optical density of black, and water fastness vary from paper to paper. Some papers give excellent results while some are quite poor.
Various treatments of paper with an undercoat to improve the resulting printing by aqueous inks are known in the prior art. This invention employs a latex-based mixture. U.S. Pat. No. 5,405,678 to Bilodeau is to a latex-based mixture for this purpose, but not employing other elements of this invention.
DISCLOSURE OF THE INVENTION
A latex of predominantly hydrocarbon polymers exhibiting a glass transition temperature near normal room temperature and having a positively charged moiety is mixed with a polyol as the predominant vehicle. The mixture is applied to paper prior to printing from a water-based ink. The resulting paper is dry to the touch without a separate drying step and forms a film without a separate heating step.—The term paper with respect to this invention is meant to describe any unitary mat or web of organic fibers as a sheet suitable for printing of text or images by a liquid aqueous ink.
The printing realized by standard office inkjet printers, such as the 7000 printer sold by the assignee of this invention, is exceptionally good, including excellent color richness, black optical density, time of drying, and resistance to water.


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