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Coating composition

A composition and polymer technology, applied in thixotropic coatings, thin material processing, copying/marking methods, etc., can solve the problems of ineffective gloss enhancement layer, low cost, large aluminum trihydrate particles, etc.

Inactive Publication Date: 2010-03-24
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] While aluminum hydrates, particularly those with a Bayerite structure, have been used to provide glossy inkjet media, the particles of many grades of aluminum trihydrate that are low enough in cost are too large to be used as an effective gloss enhancing layer for inkjet applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Utilize formula shown in table 1 to prepare primer composition:

[0026] Table 1

[0027] components

effect

Parts dry matter

calcium carbonate

Inorganic pigments

60

[0028] calcined kaolinite

Inorganic Pigment / Spacer

agent

40

polyvinyl alcohol

Adhesive

0.5

latex plastic

Adhesive

10

Defoamer

Defoamer

0.2

Surfactant

D

0.2

[0029] Using the Meyer rod coating technique, at about 25 grams per square meter (g / m 2 ) coating weight The undercoat layer is applied on a plain paper sheet. The coated sheet was then dried in a forced air oven at 120°C for about 20 to 30 minutes.

[0030] Utilize formula shown in table 2 to prepare top coat composition:

[0031] Table 2

[0032] components

effect

Parts dry matter

Aluminum trihydrate

Inorganic pigments

100

polyvinyl alcohol

Adhesive

...

Embodiment 2

[0039] Prepare top coat composition according to formula shown in table 4:

[0040] Table 4

[0041] components

effect

Parts dry matter

Aluminum trihydrate

Inorganic pigments

uncertain

Cationic silica

Inorganic pigments

uncertain

polyvinyl alcohol

Adhesive

10

boric acid

crosslinking agent

1

[0042] The ratio of ATH to cationic silica ranges from 5:1 ATH:silica to 2:1 ATH:silica (dry basis). A topcoat was then applied to the coated substrate as in Example 1 using a No. 24 Meyer rod.

[0043] The samples were then passed through the calender twice, calendered at a temperature of 93°C and a pressure of 20596 kPa (3000 psi). The 20° and 60° gloss measurements showed an unexpected improvement in gloss at the same cationized silica:ATH ratio.

Embodiment 3

[0045] Utilize formula shown in table 5 to prepare top coat composition:

[0046] table 5

[0047] components

effect

Parts dry matter

Aluminum trihydrate

Inorganic pigments

uncertain

false boehmite

Inorganic pigments

uncertain

polyvinyl alcohol

Adhesive

10

boric acid

crosslinking agent

1

[0048] The ratio of ATH to pseudoboehmite ranges from 5:1 ATH:PB to 2:1 ATH:PB (dry basis). A topcoat was then applied to the coated substrate as in Example 1 using a No. 24 Meyer rod.

[0049] The sample was then passed through the calender twice and calendered at a temperature of 93°C and a pressure of 20596 kPa (3000 psi). As shown in Table 6, the 20° and 60° gloss measurements show an unexpected improvement in gloss at the same pseudoboehmite:ATH ratio.

[0050] Table 6

[0051] coating name

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PUM

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Abstract

One or more inkjet coating compositions and coated substrates are disclosed. The coating compositions may comprise a nanomilled aluminum trihydrate pigment and a binder. Also disclosed are methods forthe production of the coating composition and media substrates coated with the composition.

Description

technical field Background technique [0001] Aluminum trihydrate (ATH) is the compound Al(OH) 3 The common name for gibbsite, which exists in three phases: gibbsite, norsanite and bayerite. Gibbsite is a flaky monoclinic crystal with a hexagonal shape. Nozogisite is a triclinic crystal, while bayerite is a flaky monoclinic crystal. [0002] While aluminum hydrates, particularly those with a Bayerite structure, have been used to provide glossy inkjet media, many grades of aluminum trihydrate that are low enough in cost have particles that are too large to be used as an effective gloss enhancing layer for inkjet applications. Therefore, there is a need to provide low cost, high efficiency pigment alternatives for paper coatings which can further provide the desired black optical density and color gamut. Contents of the invention [0003] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough underst...

Claims

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Application Information

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IPC IPC(8): B41M5/00C08K3/08C09D5/04B32B5/16
CPCB41M5/5218B41M5/502Y10T428/256
Inventor C·托莱斯M·拉雅特帕瓦
Owner HEWLETT PACKARD DEV CO LP
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