Aqueous epoxy resin dispersions
AssigneeAllnex Austria GmbH
InventorsThomas Fischer, Elfriede Prucher
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Abstract
The invention relates to an aqueously dispersible epoxy resin E, comprising building blocks derived from an aliphatic polyether polyol A, an epoxy resin B having at least two epoxide groups per molecule, an epoxy resin B′ having at least two epoxide groups per molecule, which may be identical to B, or different from B, an epoxy-functional fatty acid ester D, and an aromatic polyol C, a process for the preparation thereof, and a method of use thereof.
Claims13
An aqueous epoxy resin dispersion comprising an aqueously dispersible epoxy resin E,
- wherein the aqueously dispersible epoxy resin E comprises
- building blocks derived from an aliphatic polyether polyol A,
- an epoxy resin B having at least two epoxide groups per molecule,
- an epoxy resin B′ having at least two epoxide groups per molecule, which may be
- identical to B, or different from B,
- an epoxy-functional fatty acid ester D,
- an aromatic polyol C, and
- unreacted epoxy-functional fatty acid ester D in an amount to correspond to a mass fraction of from 0.5% to 20%, where the mass fraction is the ratio mD/mE of the mass mD of the component D to the mass mE of resin E in the composition.
A process of making an aqueous epoxy resin dispersion comprising an aqueously dispersible epoxy resin E, which process comprises
- reacting in the first step an aliphatic polyether polyol A and an epoxy resin B having at least two epoxide groups per molecule, preferably in the presence of an acidic catalyst, wherein an adduct AB is formed,
- this adduct AB is then reacted in the second step in an advancement reaction with a further epoxy resin B′, the epoxy functional fatty acid ester D, and an aromatic polyol C,
- wherein the amount of D is chosen such that a portion of at least 5% thereof remains unreacted.
(canceled)
Dependencies are inferred from the claim text.