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UV-hardenable dispersions based on polyisocyanates

A polyisocyanate and isocyanurate technology, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve problems such as not revealing chain extension reactions

Active Publication Date: 2008-08-13
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document does not disclose chain extension reactions with diamines or polyamines for the synthesis of high molecular weight polyurethanes

Method used

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  • UV-hardenable dispersions based on polyisocyanates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086]468 g of Desmodur N 3300(R) (trimer with isocyanurate structure based on 1,6-hexamethylene diisocyanate, Bayer MaterialScience AG, Germany), 34.8 g of dimethylol Propionic acid, 0.4 g of Desmorapid Z(R) (tin catalyst, Bayer MaterialScience AG, Germany) and 0.4 g of 2,6-di-tert-butyl-4-methylphenol were dissolved in 300 g of acetone, and homogenize. At 55°C, 204.2 g of hydroxyethyl acrylate were metered in such that the temperature did not exceed 65°C. After reaching the theoretical NCO value, a solution of 5.86 g of ethylenediamine (117% chain extension) in acetone (32 g) was added and stirred for 30 minutes. After adding 19 g of triethylamine, 980 g of distilled water were added to the dispersion and the acetone was distilled off under slight vacuum. A polyisocyanate-based dispersion 1) was obtained with a solids content of 37%, a pH of 7.9 and an average particle size of 97 nm.

[0087] Dispersions based on polyisocyanates 1)-6) were mixed with 1% of the photoinitia...

Embodiment 2

[0106] 462 g of Desmodur N 3300(R) (trimer with isocyanurate structural units based on hexamethylene diisocyanate, Bayer MaterialScience AG, Germany), 38.6 g of methoxy Polyethylene glycol (mol. weight 750, Carbowax(R) MPEG 750, U.S. Dow Chemical Company (DOW Chemical Company, USA)), 19.9 grams of dimethylolpropionic acid, 0.4 gram of Desmorapid Z(R) (tin catalyst, Bayer, Germany (Bayer MaterialScience AG, Germany)) and 0.8 g of 2,6-di-tert-butyl-4-methylphenol were dissolved in 130 g of acetone and homogenized. At 55°C, 232 g of hydroxyethyl acrylate were metered in such that the temperature did not exceed 65°C. After reaching the theoretical NCO value, 15 g of triethylamine was added and the prepolymer solution was dispersed in 990 g of distilled water. A solution of 4.2 g of ethylenediamine (degree of chain extension 117%) in water (38 g) was then added and stirred until no isocyanate groups could be detected. Acetone was distilled off under mild vacuum. This gave a poly...

Embodiment 3

[0108] 468 g of Desmodur N 3300(R) (trimer with isocyanurate structural units based on hexamethylene diisocyanate, Bayer MaterialScience AG, Germany), 37.5 g of methoxy Polyethylene glycol (mole. Weight 750, MPEG 750, U.S. Dow Chemical Company (DOW Chemical Company, USA)), 19.3 grams of dimethylol propionic acid, 0.36 gram of Desmorapid Z (tin catalyst, Germany Bayer material science (Bayer MaterialScience AG, Germany)) and 0.76 g of 2,6-di-tert-butyl-4-methylphenol were dissolved in 130 g of acetone and homogenized. At 55°C, 252.2 g of hydroxypropyl acrylate were metered in such that the temperature did not exceed 70°C. After reaching the theoretical NCO value, 12.4 g of triethylamine were added and the prepolymer solution was dispersed in 732 g of distilled water. A solution of 4.2 g of ethylenediamine (degree of chain extension 117%) in water (38 g) was then added and stirred until no isocyanate groups could be detected. Acetone was distilled off under mild vacuum. This ...

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Abstract

Aqueous UV-hardenable dispersions are provided, as well as their use for the production of coating agents, in particular coatings for ligneous substrates. The dispersions comprise the reaction product of a) one or more polyisocyanates of which at least one polyisocyanate is an oligomeric polyisocyanate of hexamethylene diisocyanate with urethane, biuret, iminooxadiazindione and / or isocyanurate structural units, b) one or more monohydroxy-functional compounds containing (meth)acryloyl groups, c) at least one component c1), which has a hydrophilising effect on the basis of incorporated (potentially) ionic groups and comprises at least one further isocyanate-reactive group and / or at least one component c2) which contains non-ionically hydrophilically acting groups and comprises at least one further isocyanate-reactive group, d) one or more difunctional and / or polyfunctional amines or hydroxyamines as chain extender, and e) optionally other monomeric, oligomeric and / or polymeric substances, which may optionally also contain further unsaturated groups.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under 35 U.S.C. §119(a-d) to German Application No. 102007006492.8, filed February 9, 2007. technical field [0003] The present invention relates to novel UV-curable dispersions based on polyisocyanates, a process for their production, and their use in the production of coating compositions, in particular coatings for wooden substrates. Background technique [0004] Prior art UV-curable dispersions generally contain a polyester acrylate component as the basic structural unit. There is a potential weakness in these polyester structures because the ester bond itself is easily hydrolyzed. Other dispersions of the prior art contain larger amounts of polyether components, either incorporated into the polymer or used as an external substance as an emulsifier or stabilizer. Such polyether structures, especially if their content is high, often lead to increased susceptibility of the coating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/28C08G18/67C08G18/12C09D175/04C09J175/04
CPCC08G18/672C09D175/16C08G18/758C08G18/3215C08G18/284C08G18/725C08G18/348C08G18/3206C08G18/792C08G18/12C08G18/283C08G18/3228C08G18/0823C08G18/72C08G18/18C08G18/82C08J3/02C08G18/10
Inventor H·布卢蒙E·吕曼S·萨默C·伊尔勒
Owner COVESTRO DEUTSCHLAND AG
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