Use of partial esters of oligoglycerols with fatty acids as pigm

Details Use of partial esters of oligoglycerols with fatty acids as pigm Use of partial esters of oligoglycerols with fatty acids as pigm

1991-12-16

1994-08-09

Klemanski, Helene

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106401, 106500, C09D 1106, C11C 300

Patent

active

053363132

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

Field of the Invention
This invention relates to the use of optionally ethoxylated and/or propoxylated partial esters of oligoglycerols obtainable by condensation of 2 to 20 glycerol molecules with optionally hydroxy-substituted C.sub.2-18 fatty acids as pigment dispersants for water-based lacquer dispersions.
Discussion of Related Art
Partial esters of oligoglycerols obtainable by condensation of 2 to 20 glycerol molecules with fatty acids are known, cf. Fette, Seifen, Anstrichmittel, Vol. 88, pages 101 to 106 (1986); DE-C 25 11 807. These partial esters are often used as internal lubricants and/or antistatic additives for plastics.
Anionic dispersants are frequently used as pigment dispersants for water-based lacquer dispersions, as are nonionic dispersants based on adducts of ethylene oxide and/or propylene oxide with compounds containing active hydrogen atoms, cf. H. Kittel (ed.), Lehrbuch der Lacke und Beschichtungen, Vol. III, pp. 250 to 258, Verlag W. A. Colomb, Berlin (1976), or low molecular weight polyacrylic acid salts, cf. DE-A 3,318,595.
However, the use of the known dispersants in water-based lacquer dispersions is attended by various disadvantages. More particularly, unwanted foaming occurs to an increased extent in the water-based lacquer dispersions.


DESCRIPTION OF THE INVENTION

Other than in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients or reaction conditions used herein are to be understood as modified in all instances by the term "about".
The present invention is based on the observation that the above-mentioned optionally ethoxylated and/or propoxylated partial esters of oligoglycerols obtainable by condensation of 2 to 20 glycerol molecules with optionally hydroxy-substituted C.sub.2-18 fatty acids have little, if any, effect on the foaming behavior of the water-based lacquer dispersions. In addition, the partial esters improve the stability of the water-based lacquer preparations in storage and have little effect on their viscosity behavior. Finally, the partial esters have an excellent wetting effect which is reflected in high gloss levels of the dried lacquer films. Finally, there is a noticeable improvement in resistance to methyl ethyl ketone and in the mechanical properties, particularly in the case of water-based alkyd resin preparations, by comparison with low molecular weight polyacrylic acid salts as pigment dispersants. In addition, water-based lacquer preparations, particularly where they contain alkyd resins, perform as well as corresponding state-of-the-art lacquers in the condensation and salt spray testing of metal plates coated with the lacquer dispersions.
The partial esters to be used in accordance with the invention are prepared from oligoglycerols--obtainable by condensation of 2 to 20 glycerol molecules--as the alcohol component, oligoglycerols synthesized formally from 3 to 10 and more particularly from 4 to 6 glycerol molecules being preferred for the production of the partial esters. Technical grade mixtures of the oligoglycerols having the stated chain lengths may also be used. Oligoglycerols obtainable by other methods are also suitable for the preparation of the partial esters, cf. the above-cited literature reference in Fette, Seifen, Anstrichmittel (1986).
To prepare the partial esters to be used in accordance with the invention, the oligoglycerols mentioned above are partly esterified with optionally hydroxy-substituted C.sub.2-18 fatty acids, the partial esters preferably containing at least one and, more preferably, at least two free hydroxyl groups in the oligoglycerol part. Suitable fatty acids are linear or branched, more particularly linear, saturated or unsaturated fatty acids containing 2 to 18 carbon atoms. Typical examples of such fatty acids are acetic acid, propionic acid, valeric acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, paimitic acid, isopalmitic acid, stearic acid, isostearic acid, palmitoleic acid, oleic acid, ricinol

REFERENCES:
patent: 4271051 (1981-06-01), Eschwey
patent: 4332587 (1982-06-01), Kressner et al.

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