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Porous pigment coating

A pigment layer and pigment technology, applied in thin material processing, instruments, optics, etc., can solve problems such as deteriorating the anti-foaming performance of printing media

Inactive Publication Date: 2012-07-04
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processing conditions tend to deteriorate the anti-foaming properties of the print media

Method used

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  • Porous pigment coating
  • Porous pigment coating
  • Porous pigment coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0024] The surface sizing of the base paper stock (110) helps determine the overall strength and stiffness of the base stock. However, the application of a surface sizing press generally reduces the porosity of the base paper stock, thereby reducing the anti-foaming properties of the base paper stock (110) during toner fusing. As a result, according to an exemplary embodiment, the Gurley porosity of the present exemplary base paper stock (110) is controlled at about 25-100 seconds to ensure foam-free performance. The internal bond strength of the base paper stock (110) improves anti-foaming properties. More specifically, during toner fusion, water vapor can rapidly diffuse into the pigment coating (120) from the strong, open-celled fiber layer of the raw base medium (110). However, if the internal bond strength of the exemplary base paper stock (110) is not strong enough (ie, poor fiber bonding), then the fibrous layers of the base paper stock cannot resist expansion due to w...

Embodiment 1

[0055] The paint pigments were prepared according to the following formula:

[0056] component

number of copies

ACC (Aragonite Calcium Carbonate Slurry)

85 servings

CCC (calcite calcium carbonate slurry)

15 servings

Poly(styrene-butadiene) latex

10 servings

polyvinyl alcohol

0.6 servings

Electrolyte (salt mixture)

4.5 servings

Polystyrene latex (particle size 0.35 microns)

2 servings

Polyacrylate

0.3 servings

[0057] Table 2

[0058] The solids content of the coating pigment composition can be 60%-75% by weight, and the viscosity is 1000cps-1500cps (measured with a low shear Brookfield viscometer at 100 rpm) or 30cps-40cps (higher shear Hercules viscometer at 6000rpm). high shear rate measurements). The coating pigment is applied to one side of the base stock, but according to one embodiment, the coating pigment is applied to both sides of the base stock using an in-line coater o...

Embodiment 2-5

[0061] In Examples 2-5, the same coating formulations and coating procedures as described in Example 1 were used on the base paper stock. The base papers used in Examples 1-5 had similar compositions in filler content and fiber composition, but differed in bulk size, surface size, and basis weight. Specific details are given in Table 3 below:

[0062] Internal bond strength (J / m 2 )

[0063] table 3

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Abstract

In one aspect of the present system and method, an electrophotographic media includes a porous base media and a bi-modal pigmented composition disposed on the porous media that provides an increased resistance to blistering during pigment fusing. The bi-modal pigment may include a first pigment and a second pigment, the first pigment including particles having acicular morphology, and the second pigment including substantially spherical particles.

Description

technical background [0001] With the rapid development of digital image technology, traditional monochrome electrophotographic printing is gradually being replaced by full-color, high image quality electrophotographic printing. Electrophotographic printing technology enables on-demand, high-quality printing at home without the need for vocational skills, such as those in conventional offset printing (lithographic printing) in a printing house. [0002] Traditionally, the print quality of full-color electrophotographic printing operations has been limited by the properties of the print medium. To improve the image quality of color electrophotographic printing, coated printing media, such as paper, are often used. Conventional coated print media are coated with pigment compositions and other functional materials configured to facilitate toner transfer. Additionally, conventional print media coatings and methods are used to enhance the gloss and surface smoothness of uncoated p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G7/00
CPCG03G7/0093G03G7/006G03G7/0073G03G7/0013G03G7/002G03G7/008G03G7/0066Y10T428/24983Y10T428/252Y10T428/24934Y10T428/277Y10T428/24802Y10T428/24893Y10T428/2913Y10T428/254Y10T428/292Y10T428/249987Y10T428/249953G03G7/00
Inventor 周晓奇
Owner HEWLETT PACKARD DEV CO LP