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Coating agent comprising oligocarbonate for scratch-resistant finishing lacquer

An oligocarbonate, composition technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of not giving detailed quantitative composition or molecular weight and OH functionality of polycarbonate polyol, low crosslinking density, high viscosity problem

Inactive Publication Date: 2007-01-10
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PU coatings made from them lack sufficient solvent and chemical resistance due to the resulting low crosslink density
Also, for a solids content of 70% by weight, a viscosity of 3000 to 5000 mPas / 23°C is too high for the formulation of high solids PU coating materials
[0011] In the prior art, for example in EP 1101780A, EP 819710A and EP 778298A, for the reaction of mixtures of polyacrylates and other polyols such as polyesters and / or polycarbonates as polyol binders and polyisocyanate crosslinkers The compounds are used in two-pack PU coating systems, there are often general references, but nothing is said about the specific advantages of these particular mixtures
Also, no details are given on the quantitative composition of such hybrid systems or the molecular weight and OH functionality of the polycarbonate polyols

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] The preparation of the resin of component b) is carried out by copolymerization of components b1) to b7) according to conventional methods familiar to those skilled in the art [Houben-Weyl (eds.): Methods of Organic Chemistry, 4th edition, E20 / 2. Thieme, Stuttgart 1987, p. 1156], preference is given to free-radical solution polymerization of components b1) to b7) in the presence of free-radical initiators at temperatures from 140°C to 240°C.

[0063] The monomers and / or oligomers b1) to b7) are generally incorporated into the copolymer in the same proportions in which they were used for the polymerization. The distribution of binding units is essentially random.

[0064] Suitable base polymers b1) for the copolymer b) essential to the invention include in principle all polybutylene moieties having a number-average molecular weight of 500-10,000 g / mol and having ethylene double At least 10 mole percent, preferably at least 20 mole percent, more preferably at least 40 mo...

Embodiment 1

[0105] Preparation of aliphatic oligocarbonate diols with a number average molecular weight of 1000 g / mol based on 1,6-hexanediol

[0106] 2943 g of 1,6-hexanediol containing 0.7 g of ytterbium(III) acetylacetonate and 1051 g of dimethyl carbonate were charged at 80°C into a 5-liter pressure reactor with a distillation apparatus installed on top, a stirrer and a receiver ester. The reaction mixture was then heated to 150° C. under nitrogen atmosphere within 2 hours and kept at this temperature under reflux and stirring for 2 hours, the pressure was increased to 3.9 bar (absolute). The elimination product methanol was subsequently removed by distillation as a mixture with dimethyl carbonate, during which the pressure continued to drop by a total of 2.2 bar over the course of 4 hours. The distillation step was then terminated and a further 1051 g of dimethyl carbonate were pumped into the reaction mixture at 150° C., the reaction mixture was maintained at this temperature for 2...

Embodiment 2

[0109] Preparation of an aliphatic oligocarbonate diol with a number average molecular weight of 650 g / mol, based on 3-methyl-1,5-pentanediol

[0110] According to the steps of Example 1, the difference is that instead of 1,6-hexanediol, 34092 grams of 3-methyl-1,5-pentanediol and 8.0 grams of acetylene were added to the 60-liter autoclave at the beginning Ytterbium(III) acetone, and dimethyl carbonate was added in three steps, twice at 10223 grams and once at 7147 grams.

[0111] This gives a colorless liquid oligocarbonate diol having the following properties:

[0112] m n = 675 g / mol; OH number = 166.0 mg KOH / g; viscosity: 4146 mPas at 23°C.

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PUM

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Abstract

Provided a polyisocyanate-containing coating used as scratch-resistant top coat material, especially a top coat material for automobiles. This coating composition comprising (A) a polyol component comprising (a) 1 to 50 pts.wt. of an aliphatic oligocarbonate polyol having a number-average mol.wt. Mnof 200 to 5,000 g / mol and (b) 50 to 99 wt.% of a hydroxy functional polyacrylate polyol, and (B) one or more OH reactive (poly)isocyanate cross-linking agent having an average NCO functional value of >=2.0.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under 35 U.S.C. §119(a-c) to German Patent Application 10 2005 026863 filed on October 10, 2005. technical field [0003] The present invention relates to new coating compositions comprising polyisocyanates, aliphatic oligocarbonate polyols and polyacrylate polyols, a process for their preparation and their use in the production of coatings. Background technique [0004] Scratch-resistant topcoat materials, especially for automotive topcoats and for automotive repainting, have received considerable attention for many years. In addition to the properties that such topcoat materials should have, for example a low likelihood of being scuffed during car washing, a further requirement is that these coating systems must exhibit outstanding solvent and acid resistance. [0005] Therefore, especially in recent years, 2-component polyurethane systems have been established on the market, which a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D175/06
CPCC08G18/4277C08G18/6254C08G18/4063C09D175/08C08G18/44C09D175/04C09D175/06
Inventor S·霍法克C·瓦姆普雷希特M·梅希蒂尔N·尤瓦
Owner COVESTRO DEUTSCHLAND AG
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