Patent GB-404664-A (GB)
Title: Improvements in the manufacture and production of condensation products
IPC: C08G12/42
Filed: 1932-07-13
Abstract: The products obtained by condensation, preferably in the presence of acid condensing agents, of urea and/or thiourea and formaldehyde or its polymers, methylol derivatives of urea and/or thiourea or alkyl ethers thereof or the amorphous products obtained from the methylol compounds by splitting off water or mixtures of those substances in the presence of a monohydric alcoholic solvent are condensed with hydroxyl bearing esters of fatty acids containing at least ten carbon atoms, the products, after neutralisation and expulsion of the excess solvent if necessary, being heated until they are soluble in non-alcoholic solvents and, if desired, subjected to a hardening treatment. The excess of alcoholic solvent may be removed before the products are finally heated and the ester may be added at any stage of the process.  The products are soluble in solvents such as esters, ketones and hydrocarbons as for example butyl acetate, toluene, oil of turpentine and fatty oils.  Suitable acid condensing agents include inorganic and organic acids and substances yielding acids such as phosphoric, sulphuric, nitric, hydrochloric, formic, acetic, oxalic and benzene sulphonic acids, acetic anhydride and urea nitrate.  The alcoholic solvents include methanol, ethanol, propanol, isopropanol, butanol, isobutanol, pentanol-1, methyl-3-butanol-1, methyl-2-butanol-1, hexyl alcohols, ethylene glycol mono-alkyl or aryl ethers and benzyl alcohols.  Fatty acid-esters include the hydroxyl bearing esters of glycols such as mono-, di- or triethylene, -butylene or -amylene glycol, hexylene glycols, polyglycols, glycerol, pentaglycerol, pentaerythritol, arabitol or mannitol with capric, lauric, palmitic, margaric, stearic, behenic, oleic, linoleic, linolenic, erucic, ricinoleic, and elaeostearic acids, or of the mixtures of acids obtainable by the cleavage of fatty oils or fats such as linseed, cottonseed, coconut, chinawood and castor oils, tallow or train oils.  Mixtures of the esters or wax esters also may be used.  The condensing agent may be neutralised by the hydroxides or carbonates of sodium, alkali metals such as potassium or lithium or the hydroxides of alkaline earth metals such as magnesium, barium, calcium and strontium or alkaline reacting compounds such as di- or tri-sodium or potassium phosphate.  The final products are soluble in non-alcoholic solvents such as liquid aromatic hydrocarbons, halogenated aromatic hydrocarbons, esters of aliphatic carboxylic acids cyclic ketones and alcohols and the lesser condensed products are also soluble in aliphatic and hydroaromatic hydrocarbons and aliphatic ketones.  The products are compatible with cellulose esters such as nitrocellulose.  The products are suitable as binding agents for abrasive particles such as carborundum, corrundum, glass or quartz and may be used in the manufacture of abrasive discs or paper. In examples (1) dimethylolurea is mixed with a solution of an ester derived from glycerine and linseed oil fatty acids in butyl and ethyl alcohol and containing urea nitrate and the product after heating in neutralised with tertiary sodium phosphate.  The product is worked on a heated kneading machine to remove the excess of alcohol and to yield a product soluble in non-alcoholic solvents.  A solution of the product in toluene is applied to paper and after strewing on abrasive grains the product is hardened to yield an abrasive paper.  (2) A resin obtained by the condensation of dimethylolurea in butyl alcohol is heated with an ester obtained from glycerine and ricinoleic acid to obtain a product soluble in esters, hydrocarbons and oil of turpentine and compatible with cellulose esters.  (3) An ester derived from glycerine and linseed oil fatty acids is dissolved in a solution of a urea formaldehyde condensation product in butyl alcohol and the product is kneaded to yield a resin.  (4) Urea and linoleic monoglyceride are heated with a solution of formaldehyde and formic acid in ethyl alcohol and butanol and the product, neutralised with trisodium phosphate is worked up as in example (1).  (5) Dimethylolurea is heated with iso-butanol in the presence of urea nitrate and the product, neutralised by tertiary sodium phosphate, is heated with an ester derived from glycerol and linoleic acid.  (6) Dimethylolurea is heated with a mixture of n-butanol and ethyl alcohol in the presence of urea nitrate and the product is heated with a wax ester derived from glycerine and carboxylic acids derived from montan wax according to Specification 305,552 or with an ester derived from glycerine and olive oil fatty acids.  Specifications, 260,253, 261,029, 266,752, 296,361, 301,696, 305,552, 319,251, 332,634, [all in Class 2 (iii) Dyes &c.], and 360,909 also are referred to.