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Radiation curable compositions

A radiation curing, composition technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve problems such as increased processing and expenditure

Inactive Publication Date: 2006-07-12
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This removal results in significantly increased processing and expense that could be avoided if monomer removal was not required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Preparation of Acrylated Allophanate

[0080] To a three liter round bottom flask equipped with a stirrer, heater, dropping funnel and oxygen inlet tube was charged 1275.0 g (15.18 eq) of hexamethylene diisocyanate, 468.6 g (1.36 eq) of poly(ε- caprolactone) ester (PCHEA) and 0.85 g of butylated hydroxytoluene stabilizer. The mixture was stirred under air until homogeneous and heated to 80°C when 1.49 g of zinc octoate (22% Zn) catalyst was added. The reaction mixture was then heated to 100° C. and maintained at this temperature for three and a half hours when the isocyanate was determined to be 29.55% NCO by potentiometric titration. 0.7 g of benzoyl chloride was added to deactivate the zinc catalyst. The viscosity is less than 20mPa·sec at 25°C.

Embodiment 2

[0082] Preparation of HPA / PCHEA Adduct of Acrylated Allophanate

[0083] To a 500 ml round bottom flask equipped with a stirrer, heater, dropping funnel and oxygen inlet tube was added 94.1 g (0.66 eq) of acrylated ureidoacrylate from Example 1, 43.5 g (0.33 eq) of hydroxypropyl acrylate Ester (HPA), 113.9g (0.33eq) PCHEA and 1.25g butylated hydroxytoluene stabilizer. The mixture was stirred until homogeneous when 0.06 g of dibutyltin dilaurate catalyst was added. The reaction mixture was then heated to 60°C and held at this temperature for six hours when no isocyanate was visible in the IR spectrum. The viscosity at 25°C was 2,600 mPa·sec and the density was 9.3 lbs / gal.

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Abstract

A radiation curable resin that includes from 10 to 40 equivalent percent (based on the isocyanate groups) of the resin of an allophanate containing material having one or two allophanate groups; from 0 to 40 equivalent percent of the resin of an allophanate containing material having three or more allophanate groups; and from 60 to 90 percent by equivalent of the resin of urethane acrylates. The resin has an equivalent weight of ethylenically unsaturated groups capable of undergoing a polymerization reaction of from 0.001 to 0.008 eq. / g. The resin is used in radiation curable coating compositions that also include one or more photoinitiators, and optionally one or more reactive diluents, and optionally a solvent or solvent mixture.

Description

technical field [0001] The present invention relates to compounds containing isocyanate groups, allophanate groups and free-radically polymerizable C-C double bonds. Furthermore, the present invention relates to radiation-curable formulations and coating compositions comprising the compounds according to the invention. Background technique [0002] Coating compositions based on compounds comprising isocyanate groups are well known in the art. Industrial processors of coating systems, such as the coatings industry, desire such compositions to meet a wide variety of requirements. These requirements relate to both processing properties and application properties. [0003] Very important in terms of processability is the combination of very low solvent content and low viscosity of the coating system. A low viscosity is required so that the coating material can be applied without problems to the surface to be coated by conventional techniques, such as by spraying. The solvent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D4/00
CPCC08G18/673C08G18/672C09D175/16C08G18/7837
Inventor R·R·勒斯勒C·L·金尼C·M·布里特施
Owner BAYER MATERIALSCIENCE AG