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Coatings that may comprrise reactive silicon oligoners

A technology of reaction products and compositions, applied in polyether coatings, polyurea/polyurethane coatings, coatings, etc., can solve problems such as damage to operational performance

Inactive Publication Date: 2001-01-03
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To date, damage-resistant coatings have been achieved by softening the coating, but this compromises other handling properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0120] The varnish was prepared by blending the components of Example 1, but replacing the acrylic polyol with 23.88 parts of silylated acrylic polyol (prepared as given) and 20.46 parts of difunctional acrylic silane resin Substitutes acrylic silane resins and CHDM / bis(isocyanatopropyltrimethoxysilane).

[0121] The paint was sprayed over a black solvent based primer that had not been previously cured. The coating was cured for 30 minutes at 141°C to give a hard glass-like clear coating.

[0122] Material

[0123] The coating was sprayed over an uncured black solvent-based primer and cured at 129°C for 30 minutes. The clearcoat showed a very good appearance with a 20° gloss of 90 and a clarity of image of 87. Compared to a fully melamine crosslinked system with an acid rain resistance rating of 12 (with 0 being the best range from 0 to 12), this system has very good acid rain resistance of class 5. The acid rain resistance is at least equivalent to isocyanate sy...

Embodiment 4

[0125] The components of Example 3 were blended together to prepare a varnish, but with tris(methoxy / diethoxysilylpropyl)isocyanurate removed and 150.8 parts of CHDM / bis(isocyanurate) added. cyanatopropyltrimethoxysilane).

[0126] The coating was sprayed over an uncured black solvent-based primer and the coating was cured at 129°C for 30 minutes. The coating showed a very good appearance with a 20° gloss of 92 and a sharpness of image of 89. The coating had a very good grade 4 acid rain resistance of 4 and a Taber rub resistance of 70 (on a scale of 0 to 100 with 100 being the best).

Embodiment 5

[0128] The components of Example 3 were blended together to prepare a varnish, but tris(methoxyl / diethoxysilylpropyl)isocyanurate was replaced by 75.4 parts of 2-vinyl-4-ethyl- 4-Hydroxyethyl-1,3-dioxane / caprolactone / tetraethylorthosilicate adduct instead.

[0129] The coatings were sprayed over an uncured black solvent-based primer and cured at 129°C for 30 minutes. The clear coat exhibited an excellent appearance with a 20° gloss of 93 and a clarity of image of 93. The clearcoat has a mar resistance rating of 80 (on a scale of 0 to 100, with 100 being the best), as measured by an optical image evaluation of the alumina slurry rub test (on a scale of 0 ~100, with 100 being the best).

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PUM

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Abstract

A coating comprising the reaction product of R1(OH)m and OCN(CH2)tSiR4(OR5)2 and / or R2-(SiYX2)n; a graft copolymer having an acrylic polymer based backbone and stabilizing arms comprising ethylenically unsaturated monomer, the backbone being insoluble and the arms being soluble in the composition; a melamine crosslinker; and an acrylic polyol; m, n, t, R1, R2, R4, R5, X and Y defined in the text.

Description

Background of the invention [0001] The present invention relates to compositions comprising a silicon component, a stable non-aqueous dispersion, a crosslinking agent and an organic polyol which cure to provide damage and corrosion resistance which are particularly useful as topcoats for multilayer coating systems coating. [0002] Numerous patents disclose silicon-containing curable coatings, however all of them lack the specific combination of components that would make the formulated composition very effective in terms of damage and corrosion resistance. An example of such a patent is U.S. 4,467,081. [0003] Primer-clearcoat coating systems have gained wide acceptance as automotive finishes over the past decade. Subsequent efforts aimed at improving the overall appearance of such coating systems, the clarity of the topcoat, and the resistance to degradation. Further efforts are aimed at developing coating compositions with low volatile organic content (VOC). There is a...

Claims

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Application Information

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IPC IPC(8): C08F8/42C08G18/38C08G18/67C08G18/71C08G65/336C08G77/60C08K5/5465C08L61/20C09D133/00C09D133/06C09D143/04C09D151/00C09D161/28C09D171/02C09D175/04C09D183/04C09D183/10C09D201/02C09D201/10
CPCC08K5/5465C09D201/10C09D183/10C09D151/003C08L61/20C08G18/677C09D171/02C09D133/066C08G65/336C08G18/718C08F8/42C08G18/3893C09D201/025C08L2666/14C08L2666/28C08L2666/02C09D7/65
Inventor B·V·格雷戈洛维奇I·哈赞L·维尔蔡克
Owner EI DU PONT DE NEMOURS & CO
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