Compositions: coating or plastic – Coating or plastic compositions – Fat – fatty oil – fatty oil acid or salt thereof containing
Patent
1989-12-06
1991-07-16
Morris, Theodore
Compositions: coating or plastic
Coating or plastic compositions
Fat, fatty oil, fatty oil acid or salt thereof containing
106253, 106310, C09F 700, C09F 900
Patent
active
050321790
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a binder composition for preparing an air drying lacquer, and an air drying lacquer comprising said binder composition, siccative, and optionally pigments and other conventional additives. Paints according to the invention are well apted for indoor painting of carpentry, doors and windows and give a scratch resistant, high gloss surface.
For painting of carpentry indoors one uses today paint based on oil modified alkyds, which give a high gloss surface being very resistant to soiling, washing and wear. Said paints are easy applied but contain large amounts of solvents, usually white spirit, which in high concentrations in air will be a health risk for the user.
With a view to decrease the amount of solvent in the paint low viscous, air drying vegetable oils or tall oil esters have been added as non volatile diluents to the alkyd. By this it has been possible to reduce the solvent content to about 15-20% of the paint. If the oil content has been increased problems have arisen during the drying owing to skin drying of the paint which gets a wrinkled surface. In order to overcome these drying problems it is known to use organoaluminum compounds reacting with free carboxyl and free hydroxyl in the binder. By this the through drying is improved, but at the same time storage problems arise with the relatively high polymer alkyd, which reacts in the can giving a strong increase of the viscosity.
In the U.S. Pat. No. 4,090,886 storage stable drying compositions are described, comprising a drying oil or alkyd and a derivative of an aluminum alkoxide, which are said to be usable for preparing a paint having a solids content of up to 80%.
Air drying compositions comprising an alkyd and an oxo-aluminum complex are also described in EP 0 018 780.
In paints which are solely based on vegetable oils or tall oil esters to which have been added conventional siccatives it has been possible to reduce the solvent content to 5-10% , but the through drying of said paints has been too poor to make them usable. It is also known that paint can be based on latex dispersions or alkyd emulsions in order to get away from the organic solvents. Said two types of binders however give paints which are hard to apply. The latex paints are in addition thermo plastics and are fairly sensible to water, scratch sensible and hard to keep clean, and in addition it is not possible to obtain a high gloss surface with said paints.
It has now surprisingly been found that a binder composition consisting of an ester reaction product of an unsaturated, monobasic, aliphatic carboxylic acid having 16-24 carbon atoms or a mixture thereof, optionally with other acids, and a polyhydric alcohol having 6-8 hydroxyl groups as a binder in combination with an organo aluminum compound as a dryer can be used for preparing an air drying lacquer completely without solvents.
In this context the expression lacquer refers to a surface treating material comprising a binder and being either unpigmented, that is a varnish, or containing a pigment, that is an enamel.
A lacquer according to the invention has an excellent brushability, superior to latex and alkyd emulsion paints, in certain respects even better than alkyd paints, and a quite acceptable drying time. Lacquers according to the invention have a good levelling and give a glossy surface, and are therefore well apted for painting carpentry such as furniture, cupboards, doors and windows. An advantage, due to the lack of solvents, is also that the applied lacquer film does not shrink during drying but maintains the original thickness, which is likely to mean that the hiding power is better and that fewer coats are needed.
The organo aluminum compound used in the binder composition is present in an amount giving a content of 0.1-5% by weight of A1 based on the weight of the binder, preferably 1-3% by weight.
The ester reaction product in the binder composition according to the invention is obtained by esterification of an unsaturated, monobasic, aliphatic carboxylic acid having 16-24 ca
REFERENCES:
patent: 3333978 (1967-08-01), Clark et al.
patent: 3830763 (1974-08-01), Gillan et al.
patent: 4090886 (1978-05-01), Turner
patent: 4622072 (1986-11-01), Turner
Bergvik Kemi AB
Brunsman David M.
Morris Theodore
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