Patent GB-302938-A (GB)
Title: Manufacture of water-soluble preparations containing phenolic condensation products and useful for tanning and other purposes
IPC: C14C3/20
Filed: 1928-12-22
Abstract: 302,938. I. G. Farbenindustrie Akt.- Ges. Dec. 23, 1927, [Convention date]. Addition to 302,666. Emulsions, making.-The process of the parent Specification, according to which phenolic condensation products are rendered water-soluble by treatment with concentrated solutions of aromatic or hydroaromatic sulphonic acids or condensation products thereof, is modified by employing, instead of the phenolic compounds, mixtures of such compounds with substances of high molecular weight and containing no phenolic hydroxyl such as resins, oils, waxes, fats or fatty acids. Condensation of the phenols with aldehydes or aldehyde-yielding compounds may be effected during solubilization as in the prior process; for example colophony may be added to a solution of aldehyde in phenol and the mixture, treated with a sulphonic acid, forms a water-soluble condensed product. More specific examples of the invention are as follow : (1) To 150 parts of tetrahydronaphthalene sulphonic acid heated to 85‹-90‹ C. is added a solution of 40 parts of colophony in 35 parts of methylenediphenylether and the temperature maintained at 100‹ C. for about one hour. The water soluble product is cooled, diluted with water and partly neutralized with caustic soda solution to form a tanning agent giving a leather which is supple and fast to light. (2) A mixture of 60 parts of commercial cresol, 85 parts of coumarone resin and 10 parts of paraformaldehyde is condensed and solubilized by treatment at 95‹-100‹ C. with 250 parts of butylnaphthalene sulphonic acid. (3) 30 parts of castor oil dissolved in 60 parts of methylenediphenylether are added at 90‹-100‹ C. to 120 parts of partly hydrogenized phenanthrene sulphonated with 100 parts of concentrated sulphuric acid. A water-soluble product is formed in about half an hour. (4) A tannin substitute is prepared by adding to 270 parts of paratoluene sulphonic acid at 70‹-80‹ C. a mixture of 90 parts of a condensation product obtained by the action of sulphur chloride upon cresol and 60 parts of a crude tar fraction (b.p. 200‹-300‹ C.) containing phenols and neutral oil and maintaining the mixture at the said temperature for 1-2 hours. Para-toluene sulphonic acid is prepared by saponification of para-toluene sulphocliloride. Specification 251,294 is referred to. The Specification as open to inspection under Sect. 91 (3) (a) also contains the following examples :-(1) A mixture of 24 parts of purified mineral wax, 36 parts of cresol and 50 parts of hydroxybenzyl alcohol is added to 100 parts of solvent naphtha sulphonated with sulphuric acid monohydrate and maintained at 100‹ C. A watersoluble product is obtained which may be neutralized and freely diluted. (2) A wetting agent is formed by adding to 300 parts of a crude melt oinaphthaiene sulphonic acid at 80‹-100‹ C. a mixture of 70 parts of benzyl alcohol and 70 parts of a by-product of the manufacture of synthetic camphor (camphor oil) and stirring for an hour. The product can be diluted, neutralized or concentrated to a water-soluble powder. This subject-matter does not appear in the Specification as accepted.