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Levelling agent for surface paint

A technology of surface coating and leveling agent, applied in the field of leveling agent, can solve the problems of high viscosity of leveling agent, inappropriate solution, difficult handling by users, etc.

Inactive Publication Date: 2002-04-24
BYK CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a disadvantage that due to this incompatibility, a certain degree of coating haze may occur, and the viscosity of the leveling agent will become very high, making it very difficult for the user to handle. difficult, if not impossible
[0007] For coatings, the existing polymers can only provide inadequate solutions for the leveling problem, and a new leveling accelerator is urgently needed, which can make it possible to produce absolutely smooth coating films, especially for The case of powder coatings is extremely important

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In a glass flask equipped with a stirrer, thermometer, distillation unit, dropping funnel and nitrogen gas inlet tube, 3.9 g of macromonomer (macromonomer 12, see Example, which is composed of a Acryloyl, poly(2-ethylhexyl acrylate-ethyl acrylate) with a molecular weight of 5500) and 86.7 g of toluene. Nitrogen was passed through the mixture throughout the reaction. After the reaction temperature had been raised to 90 °C, a mixture of 0.92 g of AIBN, 119.6 g of 2-ethylhexyl acrylate and 6.5 g of benzyl methacrylate was added at a uniform rate over the course of 150 minutes , metered into it. After the addition step was complete, the reaction mixture was maintained at 90°C for 120 minutes. After this period of time has elapsed, the nitrogen feed is stopped and the reaction temperature is raised to 150° C. while applying vacuum (<25 mbar). Solvents, initiator decomposition products and monomer residues are distilled off until the non-volatile content is greater than 99...

Embodiment 24

[0082] 30 g of the polymer described in Example 9 (hydroxyl number approximately 65) was charged together with 4.6 g of acetic anhydride into a four necked flask equipped with a stirrer, thermometer, reflux condenser and nitrogen inlet. Nitrogen was passed through the mixture throughout the reaction. Under stirring, the reaction temperature was increased to 75° C., and stirring was continued for 2 hours. After this time, free hydroxyl groups are no longer detectable in the IR spectrum. The nitrogen supply was stopped and the reaction temperature was raised to 150°C while applying vacuum (<25 mbar). Free acetic acid and excess acetic anhydride are distilled off until the non-volatile content is greater than 99%. A polymer having a pale yellow color was obtained. Example 25: Reaction of the inventive polymer of Example 9 with an isocyanate to form a secondary carbamate

Embodiment 25

[0083] 30 g of the polymer described in Example 9 (the number of hydroxyl groups is about 65) and 30 g of butyl acetate together with 0.03 g of DBTL solution (concentration in xylene is 10%) are charged into a Thermometer, reflux condenser, dropping funnel and nitrogen inlet tube in a four-necked flask. Nitrogen was passed through the mixture throughout the reaction. With stirring, the reaction temperature was raised to 60° C. and 4.4 g of hexyl isocyanate were metered in dropwise over the course of 10 minutes. An exothermic reaction ensues. After 90 minutes, the isocyanate groups were no longer detectable in the IR spectrum. The nitrogen supply was stopped and the reaction temperature was raised to 150°C while applying vacuum (<25 mbar). Butyl acetate is distilled off until the non-volatile content is greater than 99%. A polymer having a pale yellow color was obtained. Example 26: Reaction of the inventive polymer of Example 9 with maleic anhydride to form a maleic acid ...

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Abstract

The invention relates to levelling agents for surface coatings having a weight-average molecular weight of from 5000 to 100,000. The levelling agent is a branched polymer comprising a free-radically or ionically polymerized base molecule into which macromonomeric units containing at one end a monomeric unit which has an ethylenically unsaturated bond and possessing a weight-average molecular weight of from 1000 to 30,000 have been incorporated by free-radical or ionic copolymerization, the weight fraction of the macromonomeric units, based on the total weight of the branched polymer, being from 1 to 60% by weight. The invention further relates to the use of appropriate polymers as levelling agents for coating formulations and to coating formulations comprising the levelling agents of the invention.

Description

technical field [0001] The invention relates to a leveling agent for surface coatings, the weight-average molecular weight of which is 5,000-100,000, which is suitable for providing a uniform surface for coating compositions such as paints. The present invention also relates to the use of the leveling agent of the present invention in a coating composition and the coating composition containing the leveling agent of the present invention. Background technique [0002] Painted surfaces are usually not perfectly smooth, but instead always have a structured surface to varying degrees, which is called a corrugated or orange-peel surface. These surfaces may be finely structured with short, small corrugations, or coarsely, with long corrugations. In most cases, such moiré is undesirable. This structure depends on the nature and composition of the coating compositions; for example, in the case of powder coatings, on whether these coating compositions contain solvents or are solve...

Claims

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Application Information

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IPC IPC(8): C09D7/12C08F2/00C08F283/12C08F290/04C08F290/06C09D5/46C09D7/47C09D133/04C09D133/24C09D135/00C09D155/00
CPCC08F290/04C08F290/06C09D7/06C08F290/061C08F283/12C08F290/068C09D7/47
Inventor K·豪本尼斯特A·布巴特A·弗兰克
Owner BYK CHEM GMBH
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