DE735498C - Process for the production of synthetic resins - Google Patents

Description

Process for the production of synthetic resins The invention relates to synthetic resins, those from cyclohexanol or its derivatives and oxybenzoic acid in the presence of less Amounts of catalysts, such as. B. Sch, vefelsäure can be obtained. It is surprising that synthetic resins can be obtained from these components after treatment with cyclohexanol is only dehydrated with sulfuric acid to cyclohexane, with the formation of whole , small amounts of resin, and when the oxyb: enzoic acid is replaced by phenol or cresol in the presence of sulfuric acid, only cyclohexylphenol or cresol is formed.

Although it is already known, cyclohexanol and salicylic acid without catalysts to esterify for the manufacture of synthetic resin solvents. The condensation in the present of catalysts according to the invention for the purpose of producing thermosetting synthetic resins on the other hand, cannot be found in the known regulations. Example z A mixture from 20 parts by weight of p-oxybenzoic acid, 3.5 parts by weight of cyclohexanol, i i parts by weight Toluene and 0.2% by weight. divide 96o; oiger sulfuric acid in the reflux condenser Heated for 13 hours. The liquid amount obtained becomes up to at atmospheric pressure 155 ° heated, with 1q., 8 parts of distillate pass over. The residue is in vacuo evaporated to the desired gel consistency. Example 2 The same Quantities of the same starting materials as in Example i are used for 15 hours on the rear-foot tub warmed up. The resulting mass is three times with the same volume of water with the addition washed out by a little ethyl ether, the washed-out - '# ether-resin solution becomes poured out to remove water with solid soda, filtered and then the ether at atmospheric pressure, the toluene and other low-boiling components distilled off in vacuo. At 157 'or less (2o to 22 mm of mercury pressure) the D, distillation canceled. A red-brown resin is obtained, which at room temperature is hard and tough.

. Example 3 2o part. p-oxybenzoic acid, 23 parts of cyclo-'hexanol and 0.2 parts of 96% sulfuric acid are refluxed for 71 hours. the amount of resin obtained is until neutrality with dilute soda solution and then washed with water, taken up in toluene, decolorized with charcoal and then the toluene evaporated. What remains is a viscous reddish resin, its viscosity and softening point increases with increasing heating temperature.

Example q. .

21 parts by weight of o-oxybenzoic acid (salicylic acid), 21 "q. Parts by weight Cyclohexanol and 0.4 parts by weight of 96% sulfuric acid are refluxed for 2 hours warmed up. After cooling, 3o parts are warm to absorb the sulfuric acid Water added, then the resin shaken out with ethyl ether and the ethereal solution separated from the water. The ether is distilled off at atmospheric pressure. After a A tarry resin mass is obtained by vacuum distillation.

The resins prepared according to the invention are in alcohol, acetone, Benzene, mixtures of acetone and benzene, toluene, kylene and other solvents soluble. They are soft and sticky to hard and brittle. With prolonged heating to higher temperatures, from z. B. i5o--, they pass into the insoluble state. They can be used in the manufacture of paints, as binders for fibers or fabrics Paper, batun wool, silk, asbestos, fiberglass and the like, known for modification Synthetic resins and used for other purposes.

Instead of cyclohexanol, derivatives of this substance, such as z. B. the alkylcyclohexanols, and instead of oxybenzoic acid their derivatives, such as B. dioxybenzoic acid can be used.

Claims (1)

PATENT CLAIM: Process for the production of art. resins made from oxybenzoic acid and cyclohexanol, characterized in that the two components are in the presence be condensed by catalysts.