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Direct-to-metal radiation curable compositions

Inactive Publication Date: 2009-07-09
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0002]UV curable coating compositions are known in the art. U.S. Pat. No. 5,684,081 describes a radiation-curable, aqueous dispersion, although the reference is silent as to the wavelength of the radiation to be used. Also known are compositions that are curable using UV radiation having a very low UV-B content and substantially no UV-C content (see, e.g., U.S. Patent Application Publication No. 2003/0059555 and

Problems solved by technology

Direct-to-metal ambient rapid-cure coatings with good adhesion and performance characteristics have always been a challenge in the coatings industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0115]37 parts by weight of Desmolux® U 100 and 2.8 parts by weight of IRG2022 and were mixed together well. Then 27.95 parts by weight of Barytes1, 4.44 parts by weight of B318M, 2.8 parts of TiO2 and 3.8 parts of CD9053 were added slowly to the resin mixture with continued stirring. The solvent butyl acetate 27.25 parts was added to adjust the formulation to spray viscosity. The prepared formulation was de-aerated overnight. The formulation was then applied to cold rolled steel and galvanized steel substrates by spraying with a Binks Model#2001 air-type siphon gun (air pressure 38-40 psi) to a wet film thickness of 4 mils. The sprayed panels were flashed at room temperature for 4 minutes and then cured under a forced air oven. The coatings were cured with a Fusion microwave powered unit using the Gallium doped lamp, followed by the mercury lamp at 20 feet / min. The energy density output was 1800 mJ / cm2. The resulting coating had a dry film thickness of 1.8 to 2.0 mils. The formulat...

example 2

[0116]17.93 parts by weight of Desmolux® U 100, 17.93 parts by weight of Desmolux® XP 2266 and 2.8 parts by weight of IRG2022 and were mixed together well. Then 23.68 parts by weight of Barytes1, 7.18 parts by weight of B318M and 3.58 parts of CD9053 were added slowly to the resin mixture with continued stirring. The solvent butyl acetate 26.9 parts was added to adjust the formulation to spray viscosity. The prepared formulation was de-aerated overnight. The formulation was then applied to cold rolled steel and galvanized steel substrates by spraying with a Binks Model#2001 air-type siphon gun (air pressure 38-40 psi) to a wet film thickness of 4 mils. The sprayed panels were flashed at room temperature for 4 minutes and then cured under a forced air oven. The coatings were cured with a Fusion microwave powered unit using the Gallium doped lamp, followed by the mercury lamp at 20 feet / min. The energy density output was 1800 mJ / cm2. The resulting coating had a dry film thickness of 1...

example 3

[0117]28.65 parts by weight of Desmolux® XP2683, 17.65 parts by weight of Desmolux® XP 2266 and 3.52 parts by weight of IRG2022 and were mixed together well. Then 25.21 parts by weight of T399, 0.15 parts by weight of B318M, 0.97 parts by weight of TiO2, 2.86 parts of CD9053, 10.75 parts by weight of PEA and 10.75 parts by weight of HDDA were added slowly to the resin mixture with continued stirring. The prepared solvent-free formulation was de-aerated overnight. The formulation was then applied to cold rolled steel and galvanized steel substrates by spraying with a Binks Model#2001 air-type siphon gun (air pressure 38-40 psi) to a wet film thickness of 3 mils. The coatings were then cured with a Fusion microwave powered unit using the Gallium doped lamp, followed by the mercury lamp at 20 feet / min. The energy density output was 1800 mJ / cm2. The resulting coating had a dry film thickness of 1.8 to 2.0 mils. The formulations had excellent adhesion to cold rolled steel as measured by ...

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Abstract

A process of directly coating a metal substrate and curing the coating using radiation sources such as UV radiation having a wavelength of 200 nm and above. Furthermore, compositions of the invention can be used as a tie-coat for coatings that do not bond well directly to various metal substrates.

Description

BACKGROUND OF THE INVENTION[0001]Direct-to-metal ambient rapid-cure coatings with good adhesion and performance characteristics have always been a challenge in the coatings industry. The high throughput rates combined with cure speed is of paramount importance for a metal coater to get the parts done in a fast and timely manner. Various technologies are available of which UV cure coatings is the technology of choice for very high throughput applications. The object of the present invention is to provide a coatings process that can meet the above described challenge.[0002]UV curable coating compositions are known in the art. U.S. Pat. No. 5,684,081 describes a radiation-curable, aqueous dispersion, although the reference is silent as to the wavelength of the radiation to be used. Also known are compositions that are curable using UV radiation having a very low UV-B content and substantially no UV-C content (see, e.g., U.S. Patent Application Publication No. 2003 / 0059555 and U.S. Pat....

Claims

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Application Information

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IPC IPC(8): C09D133/10
CPCC09D4/06C09D175/16C09D133/14
Inventor SUBRAMANIAN, RAMESHBEST, KURT E.GAMBINO, CHARLES A.MEBANE, CHRISTINE M.JEFFRIES, MICHAEL K.SHAFFER, MYRON W.DVORCHAK, MICHAEL K.
Owner BAYER MATERIALSCIENCE AG