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Coating compositions

A composition and coating technology, applied in paper coatings, starch coatings, casein coatings and other directions, can solve problems such as influence, inability to coat coating compositions, unfavorable stability, etc., and achieve the effect of reducing drying time

Active Publication Date: 2012-05-23
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ink fixer is often an electrolyte, from which cations adversely affect the stability of the negatively charged binder (anionic polymer)
Indeed, ink fixers can precipitate binders, which then lead to uncoatable coating compositions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0013] According to one embodiment of the invention, the coating composition comprises pigments. In one embodiment, such pigments are water insoluble pigments or pigments that are sparingly soluble in water. In another embodiment, such pigments are white pigments or mixtures of white pigments. There is no particular restriction on the chemical composition of the pigment, so long as its rheological properties when dispersed in the coating formulation make the coating solution coatable in the designed coating machine. The rheological properties here refer to the viscosity, solids content and thixotropic index of the coating solution.

[0014] In one embodiment, the pigment or pigment mixture is in the form of a pigment paste or pigment dispersion. In one embodiment of the invention, the pigment is present in the composition in an amount from about 10% to about 95%, based on the total dry weight of the coating composition. In another embodiment, the total amount of pigment is ...

Embodiment 1

[0056]Embodiment 1: the preparation of the polymer complex containing metal

[0057] Different polyvinyl alcohol (Celvol ? or Mowiol ? ) powder precooked to convert the purchased powder into a PVA solution. The precooking was carried out at 90-105° C. with stirring for 1 hour until there were no solid particles in the solution.

[0058] First, 10 parts (dry weight) of the polymer latex trade name Dow ? XU31264.50 was charged into the mixing tank and stirred with the PVA solution (3 parts dry weight). After 30 minutes, will contain 32% salt (CaCl 2 ) solution (10 parts dry weight) was slowly added to the mixture under vigorous shear stirring. A metal-containing polymer complex is thus obtained. Metal-containing polymer complexes prepared from different types of polyvinyl alcohols were compared based on their ability to remain stable and not precipitate after addition to metal salt solutions. The results are shown in Table 1.

[0059] Table 1

[0060]

Embodiment 2

[0061] Example 2: Zeta Potential of Metal-Containing Polymer Latex at Different pH

[0062] The zeta potential of the metal-containing polymer complex of Example 1C of Example 1 was measured at different pH using a zeta classifier (Nano Series) model ZEN3600 supplied by Malvern Instruments. Viscosity was also measured in cps at 100 RPM using a 2# Brookfield spindle. The pH is adjusted by NaOH or HCI solution. The results are shown in Table 2.

[0063] These results demonstrate that in the metal-containing polymer latex obtained according to Example 1C, the zeta potential obtained is relatively constant over a wide pH range. Use polymer latex adhesive (Dow only ? XU31264.50) as a comparative control.

[0064] Table 2

[0065]

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Abstract

A coating composition includes pigments or a mixture of pigments, a surface active substance and a metal containing polymeric complex. The metal containing polymeric complex contains a metallic salt, a polymeric latex and polyvinyl alcohol (PVA), wherein the polyvinyl alcohol has a molecular weight ranging from about 10,000 to about 65,000.

Description

Background of the invention [0001] Commercial digital printing such as high speed inkjet web printing is rapidly replacing traditional impact printing or "plate" printing methods such as lithography. Indeed, inkjet printing is becoming a popular means of recording images on different media surfaces, especially paper today, due to a number of reasons, including better color image quality, high-speed recording capabilities and cost Competitiveness. In this printing method, the printing medium plays a key role in the overall image quality and durability of the printed image. Therefore, finding media that can be effectively used in such printing techniques is often a challenge. [0002] For superior image quality, coated media is typically used. Such media have single or multiple image-receiving layers disposed on a media substrate. Typically, the image-receiving layer is made from a coating composition that includes inorganic or organic pigments as fillers and polymeric mater...

Claims

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Application Information

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IPC IPC(8): C09D129/04C09D109/10C09D103/02B41M5/50
CPCC09D101/26C08L23/20C08L33/08B41M5/5245D21H19/54B41M5/5254C08L25/08C09D189/005C09D105/04D21H19/36C08L2205/03C08L31/04D21H19/60C08L27/06C08L29/04C09D189/00C08L33/20C08L67/00C09D103/02C09D103/08C09D103/04C09D121/02C08L2666/04
Inventor 周晓奇G.A.翁科诺D.埃蒙森
Owner HEWLETT PACKARD DEV CO LP
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