Patent GB-327417-A (GB)
Title: A process for the manufacture and production of products having the properties of resins and waxes
IPC: C08G8/32
Filed: 1928-09-29
Abstract: 327,417. Johnson, J. Y., (I. G. Farbenindustrie Akt.-Ges.). Sept. 29, 1928. Condensation products of oxidized waxes with synthetic resins.-Hard wax-like products are obtained by esterifying high molecular condensation products of a resinous nature containing hydroxyl groups but no aromatic or hydroaromatic sulphur compounds, with the high molecular fatty acids of waxes. The wax acids may be esterified after extraction from bleached or oxidized montan-, bees-, carnauba- or other wax as by glacial acetic acid, or the bleached or oxidized wax or a conversion product thereof still containing free carboxylic acids may be treated. Temperatures of near or above 200‹ C. are necessary when the ingredients are heated together alone or in presence of naphthalene or other organic solvent, but when the process is carried out with aqueous emulsions of the components lower temperatures may be used. Accelerators, e.g. sodium bisulphate, boric acid, or anhydrous zinc chloride, may be present. Especially hard products may be obtained by (1) prolonged heating; or (2) converting part of the wax acids, before, during or after the esterification into metal salts, especially of calcium or other divalent metal; or (3) dispersing the powdered wax-resin ester product in an aqueous solution of formaldehyde and a phenol, and adding ammonia or other agent affecting condensation of the phenol and aldehyde. Stability to temperature and resistance to solvents may be increased by treating the esters with trioxymethylene or other substance yielding formaldehyde on heating. Dyestuffs, kieselguhr, wood meal, cork powder, asbestos fibre, natural or artificial resins, asphalts, pitches, gums, rubber, cellulose esters or ethers, or other fillers may be added. High-molecular resinous condensation products specified are artificial resins or organic glasses such as are obtained by condensation of aldehydes with aldehydes, with phenol and its homologues, or with urea and its derivatives, e.g. thiourea. The intermediate condensation products in the manufacture of artificial resins from aldehydes, so long as they contain hydroxyl-groups and in the course of the operation are further polymerized to the resins, may be used. o- and p-hydroxybenzyl alcohols, and mono- or dimethylol-urea or -thiourea are specified. Light coloured products are obtained by operating out of contact with oxygen, e.g. in vacuo or in carbon dioxide or nitrogen, and by starting with wax bleached by chromic acid or other oxidizing agent or with the free acids extracted therefrom. In examples, (1) a mixture of montan wax bleached by chromic acid as described in Specification 305,552, and a condensation product of o cresol and formaldehyde is melted with vigorous stirring in an atmosphere of carbon dioxide, and sodium bisulphate added; (2) the ester obtained by melting together bleached montau wax and o-cresol formaldehyde-resin is heated in a current of carbon dioxide and the product dispersed in a solution of phenol containing formaldehyde to which is then added concentrated ammonia; by distilling off the volatile constituents a brown resinous product is obtained; (3) a solution of boric acid in a mixture of benzene and hexyl alcohol is added to a solution in xylene of aldol resin and montan wax prepared as described in Specification 305,552. The mixture is heated under a reflux condenser and then the xylene is evaporated off. p-cymene, 1.2.4.5-tetra-methylbenzene, or tetra- or deka-hydronaphthalene may replace the xylene. Specifications 219,368 and 322,496 also are referred to.