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US 7,002,035 B2Granted
Color stabilization of base-stabilized ethylenically modified unsaturated monomers
AssigneeRoehm GmbH & Co.KG
InventorsBardo Schmitt, Joachim Knebel, Marianne Omeis
Life of this patent
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Abstract
The invention relates to the use of at least one compound from the tocopherol group for the color stabilization of ethylenically unsaturated monomers, particularly hydroxyalkyl(meth)acrylates, which already comprise at least one polymerization inhibitor for base stabilization or storage stabilization. Such color-stabilized and polymerization-inhibited monomers are preferably used in clearcoat and high solid paints.
Claims17
A method for color stabilization of ethylenically unsaturated monomers, comprising:
- mixing at least one tocopherol with a composition comprising one or more ethylenically unsaturated monomers and at least one polymerization inhibitor which is different from said at least one tocopherol to form a mixture, wherein the tocopherol is present in the mixture in an amount effective for color stabilization;
- wherein the tocopherol is present in an amount that leads to no increase in the Pt/Co color number measured photometrically as the absorbance between 460 and 620 nm when the mixture is stored at 50° C. for 2 to 10 weeks.
Dependencies are inferred from the claim text.