DE1035900B - Process for the production of copolymers for paints - Google Patents

Description

Process for the production of copolymers for paints It is known that some properties of paints by reaction with dienes, such as cyclooctatetraene can be improved. Such varnishes do not always dry quickly enough tack free.

It has now been found that valuable paints are obtained if esters are used from polyhydric alcohols and unsaturated, drying fatty acids with vinylcyclooctatetraene Reacts at elevated temperature. All natural drying and semi-drying Esters from polyhydric alcohols and unsaturated fatty acids can be used z. B. vegetable or animal oils, such as linseed oil, castor oil, soia oil, wood oil, Poppy seed oil, sunflower oil, cottonseed oil, oiticica oil, perilla oil, sperm oil, sardine oil and Trane. Furthermore, z. B. simple and mixed esters of the natural oils underlying unsaturated fatty acids also with other polyhydric alcohols, z. B. trimethylolpropane or pentaerythritol, suitable. You can also use polybasic saturated or unsaturated carboxylic acids, such as phthalic acid, adipic acid, pimelic acid, Suberic acid, azelaic acid and sebaic acid or maleic acid.

In addition to Vinvlcyclooctatetraen its mixtures with known dienes can be used, for example with phenylbutadiene, as they are, for. B. obtained in the production of cyclooctatetraene. However, the vinylcyclooctatetraene content of such mixtures should not be less than about 100%, because otherwise the properties of the coatings obtained deteriorate. Depending on the desired properties of the paints, about 10 to 30 parts of vinylcyclooctatetraene can be used per 100 parts of the drying oil, but also larger amounts if necessary.

The reaction is expediently carried out between about 120 and 375 ° C. and particularly advantageously at about 150 to 280 ° C. with stirring and then generally requires 2 to 10 hours. This is followed by heating for about 1 to 3 hours at about the same temperatures, in particular to about 280 to 320.degree. In some cases it is advantageous to use polymerization catalysts, in particular peroxide constitution, or siccatives, e.g. B. cobalt naphthenate or nickel enolate, or add quinones or oxygen. This often allows the reaction temperature to be reduced.

Clear oils or resins are obtained which are more viscous than the starting product are. They do not contain any volatile components in a high vacuum.

The parts mentioned in the examples are parts by weight.

Example 1 A mixture of 108 parts of stand oil and 20 parts of a mixture of one part of vinylcyclooctatetraene and 2 parts of phunylbutadiene is heated to Sic, # dc-i i # .- over the course of 15 minutes with stirring. A -.-, connecting the temperature was raised for 4 hours at 270 to 275'C and then heated for 1 hour at 300'C. The reaction product obtained is a clear, viscous 01 with the following key figures: Viscosityi acid number 1 saponification number ester number diene number 22070 11 169 158 2.5 Example 2 108 parts of stand oil and 20 parts of a mixture of one part of vinylcyclooctatetraene and 2 parts of phenylbutadiene are heated to 180.degree . C. in the course of 15 minutes. The temperature is then increased to 275 ° C. over the course of 4 hours. The reaction product has the following properties: Viscosityi acid number 1 saponification number ester number diene number 30900 1 7.5 1 17.4 166 2.9 Example 3 A mixture of 4 parts of vinylcyclooctatetraene and 1 part of phenylbutadiene is heated to 180 ° C for 15 minutes with 162 parts of linseed oil. The temperature is now increased to 275'C in the course of 7172 hours and then heated to 300'C for a further hour : '#' iskosityi acid number 1 saponification number ester number diene number 455 5.8 166 160 4.5 Example 4 100 parts of soybean oil, together with 20 parts of a mixture of one part of vinylcyclooctatetraene and one part of phenylbutadiene and 1 part of nickel acetylacetonate, are heated to 175.degree. C. within 15 minutes. The temperature is then increased to 200.degree. C. and at 200.degree. C. for 4 hours held. The reaction product has the following characteristics: Viscosityi acid number 1 saponification number ester number diene number 680 1 2.8 1 168 165 9.1 If soia oil is treated in the same way without the addition of vinylcyclooctatetraene and phenylbutadiene, the key figures for the product are as follows: Viscosity / acid number 1 saponification number ester number diene number 600 1 3.8 1 194 190 -1.3

Claims (3)

PATENT CLAIMS: 1. Process for the production of mixed polymers for paints, characterized in that esters of polyhydric alcohols and unsaturated dry fatty acids are reacted with vinyl cyclooctatetraene at elevated temperature. 2. The method according to claim 1, characterized in that a mixture of vinyl yelooctatetraene and phenylbutadiene is used. 3. The method according to claim 1, characterized in that # 'invlcvclooctatetra,? # N containing mixtures obtained in the preparation of cyclooctatetraen are used. Documents considered: German Patent No. 713 697; . USA. Patent No. 2,581,413; Reppe, New Developments in the Field of Chemistry of Acetylene and Carbon Oxide, 1949, pp. 84 to 89 (especially p. 89, paragraph 4); Blorn, Basics of Painting Science, 1954, p. 140; Payne, Organic Coating Technology, Vol. 1, 1954, pp. 94-101 .