Dispersant effect on aluminum pigments

A pigment and dispersion technology, applied in the direction of pigment slurry, application, household appliances, etc., can solve the problems of alcohol system incompatibility, difficult to handle by the preparation personnel, difficult to use, etc.

Inactive Publication Date: 2018-05-11
SUN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Above 10% solids, VMP aluminum pigment slurries tend to become very viscous and thixotropic, making them difficult to work with
Below 10%, the formulation flexibility of VMP aluminum pigment slurry is reduced
[0005] There are two major issues associated with VMP aluminum pigment slurries that prevent their widespread use
The first problem is that because it is usually supplied at a low solids content of 10%, it is difficult for formulators to handle in some applications
The second problem is that VMP aluminum pigments have been shown to be incompatible with systems containing large amounts of alcohol
This limits its use to gravure inks and non-alcoholic coating applications, while making it difficult or impossible to use in flexographic inks
[0006] Increased viscosity and poor appearance in printed films when VMP aluminum pigments are introduced into alcohol-based systems

Method used

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  • Dispersant effect on aluminum pigments
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  • Dispersant effect on aluminum pigments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1 (3864-169-6)

[0068] 64.2 g of Benda-Lutz Splendal 6002 (10.9% VMP aluminum in ethyl acetate) (Sun Chemical) was charged into a 250 mL plastic bottle with a screw top. The VMP pigment slurry was diluted with 57.2 g of ethanol and mixed. The mixture was centrifuged at 2500 RPM for 30 minutes. 57.2 g of supernatant was removed. An additional 57.2 g of ethanol was added to the bottle and mixed well with the precipitate and remaining supernatant. The mixture was centrifuged at 2500 RPM and 57.2 g of supernatant was removed. At this point 0.35g of Disperbyk 111 (BYK) was added to the remaining slurry. The mixture was blended thoroughly to produce a slurry of treated 10% VMP pigment in 90% 3:1 ethanol:ethyl acetate. The type of pigment, the pigment loading in the slurry, the final solvent composition and the additive dispersants used are reported in Table 1.

Embodiment 2

[0069] Example 2 (3864-77C)

[0070]71.4 g of Benda-Lutz Splendal 6002 (9.8% VMP aluminum in ethyl acetate) (Sun Chemical) was charged into a 250 mL plastic bottle with a screw top. The VMP pigment slurry was diluted with 64.4 g of ethanol and mixed. The mixture was centrifuged at 2500 RPM for 30 minutes. 64.4 g of supernatant was removed. An additional 64.4 g of ethanol was added to the bottle and mixed well with the precipitate and remaining supernatant. The mixture was centrifuged at 2500 RPM and 64.4 g of supernatant was removed. At this point 0.7g of SFD-R255 (SunChemical) was added to the remaining slurry. The mixture was blended thoroughly to produce a slurry of treated 10% VMP pigment in 90% 3:1 ethanol:ethyl acetate. The type of pigment, the pigment loading in the slurry, the final solvent composition and the additive dispersants used are reported in Table 1.

Embodiment 3

[0071] Example 3 (3864-95A)

[0072] 71.4 g of Benda-Lutz Splendal 6002 (9.8% VMP aluminum in ethyl acetate) (Sun Chemical) was charged into a 250 mL plastic bottle with a screw top. The VMP pigment slurry was diluted with 64.4 g of ethanol and mixed. The mixture was centrifuged at 2500 RPM for 30 minutes. 64.4 g of supernatant was removed. An additional 64.4 g of ethanol was added to the bottle and mixed well with the precipitate and remaining supernatant. The mixture was centrifuged at 2500 RPM and 64.4 g of supernatant was removed. At this point 0.18 g Solplus D540 (Lubrizol) was added to the remaining slurry. The mixture was blended thoroughly to produce a slurry of treated 10% VMP pigment in 90% 3:1 ethanol:ethyl acetate. The type of pigment, the pigment loading in the slurry, the final solvent composition and the additive dispersants used are reported in Table 1.

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Abstract

In the present application, we report a pigment preparation comprised of an aluminum pigment, a dispersing additive and a solvent, that can either 1) reach high, >10% solids with favorable rheology; 2) be formulated into high alcohol systems; or 3) both. The pigment preparation of the present application has better formulation flexibility than other VMP aluminum pigment slurries currently available on the market.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application No. 62 / 196,417, entitled "Dispersant Effects On Aluminum Pigments," filed July 24, 2015, which is incorporated by reference in its entirety incorporated into this article. Background technique [0003] VMP (Vacuum Metallized Pigment) aluminum pigment is a flaky aluminum pigment with a thickness of about 5-50 nm. This is a direct comparison to aluminum pigments produced by milling with a thickness of about 100-600 nm. Furthermore, the surface of VMP aluminum pigments is very smooth when compared to milled pigments. The smoothness and thinness of the VMP aluminum pigment combination allows for mirror or liquid chrome-like effects when the pigment is printed. [0004] Typically, VMP aluminum pigments are supplied as low solids slurries because of their extreme fineness and lack of surface preparation which would cause them to aggregate if stored in paste or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24C09C1/62
CPCC09C1/62C09C1/24C01P2004/20C01P2004/64C01P2004/24C01P2004/51C09C1/40C09C1/644C09D11/10C09D11/322C09D11/36C09D17/004
Inventor 史蒂文·约翰森乔纳森·多勒丽萨·克拉普
Owner SUN CHEM CORP
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