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Aqueous radiation curable polyurethane compositions

A technology of hydrophilic compounds and compositions, applied in polyurea/polyurethane coatings, coatings, etc., can solve safety and environmental issues, low reactivity and other issues

Active Publication Date: 2013-03-27
CYTEC SURFACE SPECIALTIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A first disadvantage of these polymers is their low reactivity and their limitation to obtain cured coatings with good chemical resistance, such as stain resistance
Another limitation of this technique is the use of coalescing aids required for film formation
These coalescing solvents, which are generally oxygenates with high boiling points, are at least partially eliminated upon application, which can cause serious safety and environmental concerns

Method used

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  • Aqueous radiation curable polyurethane compositions
  • Aqueous radiation curable polyurethane compositions
  • Aqueous radiation curable polyurethane compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Into a reactor equipped with a mechanical stirrer was added at ambient temperature 400 g of the polyurethane dispersion A1 described herein above and 600 g of the polyurethane dispersion B1 described herein above were added slowly and under low shear until a homogeneous mixture was obtained. The MFFT of this mixture is 6°C.

[0117] Then with 1.5% photoinitiator blend (1% ADDITOL BCPK+0.5%IRGACURE DW 819) and 15% by weight of an industrial orange pigment paste for furniture applications (solids content 70%, viscosity 1000 mPa.s and containing a blend of yellow and orange pigments, white titanium dioxide pigments and stabilizers) to formulate the composition. Use approximately 1.5% by weight thickener solution (ADDITOL A 1:1 mixture of VXW 6360 and water) adjusts the viscosity of the formulated composition between 1000-1500 mPa.s.

[0118] The formulated compositions were applied at a wet thickness of 120μ on white melamine laminated MDF panels using a Meyer rod or ...

Embodiment 2-8

[0126] Example 1 was reproduced, except that the composition described in table 4 was used with the polyurethane obtained as described in tables 2 and 3.

[0127] Table 4

[0128] Example Polyurethane A quality Polyurethane B quality MFFT 2 A2 400g B2 600g 5℃ 3 A2 400g B3 600g 7℃ 4 A3 600g B2 400g 8℃ 5 A4 400g B3 600g 11℃ 6 A5 400g B3 600g 16℃ 7 A6 400g B3 600g 8℃ 8 A7 400g B4 600g 1℃

Embodiment 11-18 and comparative Embodiment 19R

[0132] Examples 11-18 and Comparative Examples 19R and 20R:

[0133] Reproduce Examples 1-8 and Comparative Examples 9R and 10R, except that the polyisocyanate 5% Bayhydur 3100 combined with the composition.

[0134] The combination has a maximum pot life of 8 hours.

[0135] The results are provided in Table 5.

[0136] table 5

[0137]

[0138] *Properties not measured further (MFFT is very high; would require incorporation of substantial coalescent to obtain suitable films).

[0139] A comparison of examples 1-8 and 11-18 with comparative examples 9R, 10R, 19R and 20R shows the better performance of the coatings obtained with the compositions according to the invention.

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Abstract

The invention relates to radiation-curable aqueous composition comprising a high molecular weight ethylenically unsaturated polyurethane obtained from the reaction of a polyisocyanate, at least one hydrophilic compound which is capable to render the polyurethane prepolymer dispersible in aqueous medium, an ethylenically unsaturated compound containing at least two reactive groups capable to react with isocyanate groups and an active hydrogen containing chain extender and a low molecular weight ethylenically unsaturated polyurethane end-capped with an ethylenically unsaturated compound containing essentially one reactive group capable to react with isocyanate groups.

Description

technical field [0001] The present invention relates to aqueous radiation-curable polyurethane compositions suitable for producing coatings, in particular color pigmented coatings, having good mechanical properties and chemical resistance. Background technique [0002] Aqueous radiation-curable polyurethane dispersions are known since they have long been offered for coating of different substrates such as wood, plastics and metals, exhibit good mechanical properties and chemical resistance as well as flexibility. [0003] Radiation-curable polyurethanes have been made from isocyanate-terminated ethylenically unsaturated polyurethane prepolymers chain-extended with polyamines. The resulting polymers exhibit high molecular weight and contain hard urea segments which often lead to dispersions with high minimum film formation temperatures. The "Minimum Film Formation Temperature" (MFFT) corresponds to the coalescence of the particles and the formation of a uniform defect-free f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C09D175/14
CPCY10S525/92C08L75/14C08G18/675C09D175/14C08G18/0823C08L2666/20C08G18/10C08G18/2825C08G18/348C08G18/67C08G18/683C08G18/758C08K3/22C08K3/20
Inventor M·蒂耶勒曼
Owner CYTEC SURFACE SPECIALTIES INC