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Dual cure composition

A composition, heat curing technology, applied in the direction of coatings, polyurea/polyurethane coatings, etc., can solve the problem of unsatisfactory obtaining hardness, solvent resistance, acid resistance, scratch resistance and scratch resistance, properties Poor, insufficient hardness, etc.

Active Publication Date: 2008-12-10
PERSTORP SPECIALTY CHEM AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Dual-cure compositions according to the prior art do not satisfactorily achieve hardness, solvent resistance, acid resistance, scratch resistance and Acceptable combination of scratch resistance
Due to the combination of heat curing and UV curing, prior art dual-cure compositions have excellent properties in the surface areas that are directly exposed to UV radiation, but poorer properties in shadow areas that are cured only by heat, especially in these areas Hard enough

Method used

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  • Dual cure composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 100 grams of ditrimethylolpropane, 137 grams of acrylic acid, 0.37 grams of methoxyphenol, 2.3 grams of methanesulfonic acid and 200 grams of toluene were added to a reaction vessel equipped with a stirrer, thermometer, oxygen inlet and an azeotropic distillation column. The mixture was heated to reflux (≈110° C.) and stirred until 10 ml of water were collected. Excess acrylic acid was neutralized with 10% aqueous NaOH after cooling the reaction mixture to room temperature. The organics were separated and washed twice with water. Toluene was removed under vacuum (30 mm Hg).

[0030] The obtained product has the following characteristics:

[0031] Hydroxyl value, mg KOH / g 331

[0032] Double bond content, mmoles / g 5.3

[0033] Chroma, APHA 50

[0034] Viscosity at 23°C, Poise 2.3

Embodiment 2

[0036] 250 g of hydroxyl-functionalized dendritic polyester (Boltorn H20, Perstorp Specialty Chemicals AB), 200 g of acrylic acid, 0.5 g of methoxyphenol, 3.5 g of methanesulfonic acid and 400 g of toluene were added to a reaction vessel equipped with a stirrer, thermometer, oxygen inlet and azeotrope. The mixture was heated to reflux (≈110° C.) and stirred until 30 ml of water were collected. Excess acrylic acid was neutralized with 10% aqueous NaOH after cooling the reaction mixture to room temperature. The organics were separated and washed twice with water. Toluene was removed under vacuum (30 mm Hg).

[0037] The obtained product has the following characteristics:

[0038] Hydroxyl value, mg KOH / g 99

[0039] Double bond content, mmoles / g 4.4

[0040] Chroma, APHA 210

[0041] Viscosity at 23°C, Poise 120

Embodiment 3

[0043] A varnish was prepared according to an embodiment of the invention (Formulations 1 and 2) and contained the product obtained in Examples 1 and 2 (component a). Two-part isocyanate-cured coatings and dual-cure coatings were prepared by ref. Coatings were made at 40°C and were applied to glass plates with a dry film thickness of ≈40 μm. The coating is cured either thermally in an oven, or thermally and UV cured. The formulation by weight and the performance of the product are shown in Table 1.

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PUM

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Abstract

Disclosed is a novel liquid radiation and thermally curing (dual cure) composition comprising (a) at least one partially acrylated tri or polyalcohol and acrylic, having has at least two hydroxyl group's, at least one acrylic or methacrylic double bond, a hydroxyl value of 50-500 mg KOH / g and a double bond concentration of 1-10 mmoles / g, (b) at least one crosslinking agent for hydroxyl functional compounds, which crosslinking agent optionally has at least one olefmic double bond, (c) an additive package comprising at least one photoinitiator, radical scavenger, light stabiliser, wetting agent and / or levelling agent, and optionally (d) at least one monomeric or oligomeric reactive diluent.

Description

technical field [0001] The present invention relates to a novel radiation-curing and heat-curing (dual-cure) composition which can be advantageously used, for example, in the production of automotive clearcoats or topcoats. Background technique [0002] The term "dual-cure composition" here refers to a composition which can be cured by free-radical polymerization, for example with ultraviolet radiation, and by heat-induced addition or condensation polymerization involving hydroxyl groups. [0003] Known dual-cure compositions are, for example: [0004] - A composition disclosed in US patent no. 4,212,901 containing (i) a polyester resin esterified with (meth)acrylate, (ii) a vinyl compound such as polyethylene glycol diacrylate or diadipate allyl ester, (iii) polyisocyanate and (iv) photoinitiator, [0005] - US Published Patent Application no. 2003 / 181,590 discloses a non-aqueous material that is thermally curable or thermally curable with actinic radiation, the non-aqueo...

Claims

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Application Information

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IPC IPC(8): C09D133/06C09D175/06
CPCC08G18/68C08J3/243C08L2312/06C09D175/16C09D133/06C09D175/06
Inventor D·詹姆斯K·索伦森H·伯恩奎斯特
Owner PERSTORP SPECIALTY CHEM AB
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