Patent GB-579197-A (GB)
Title: Improvements in and relating to synthetic resinous condensation products
IPC: C08G12/28
Filed: 1943-04-27
Abstract: Synthetic resinous condensation products are prepared by heating or mixing together under alkaline conditions an aldehyde and 4.6-diamino pyrimidyl-2 thio acetyl urea.  The term aldehyde is defined as including polymeric aldehydes, hydroxy aldehydes and aldehyde addition products which yield aldehyde under the conditions of the reaction.  The reaction may be performed at atmospheric, sub- or superatmospheric pressures and, if desired, in presence of solvents, diluents, fillers, other natural or synthetic resinous bodies or while admixed with other usual bodies which may take part in the reaction.  The reactants may be mixed in the general methods set forth in Specification 554,195.  The products with suitable additions may be employed for paints, varnishes, electrical insulation, as plasticisers for other synthetic resins, as adhesives, as binding agents, e.g. for mica flakes or abrasive grains or as casting resins. Examples describe: (1) production of a heat-bodying material from 4.6-diamino-pyrimidyl-2 thio acetyl urea and formaldehyde at room temperature; (2) alkaline condensation of the pyrimidine derivative and urea with formaldehyde under heat, addition of chloroacetamide as a curing catalyst and production of a moulding powder by incorporating a -cellulose, and zinc stearate, drying and grinding. A list of other suitable curing catalysts is given; (3) similar to (2) but with melamine in place of urea; (4) the pyrimidine derivative is condensed in alkaline medium with dimethylol urea, chloracetamide is added and a moulding powder prepared by addition of a -cellulose and zinc stearate, drying and grinding; (5) similar to (2) but with 1-phenyl guanazole as the modifying ingredient; (6) alkaline condensation of 4.6-diamino pyrimidyl-2 thioacetyl urea with furfural; (7) similar to (6) but using acrolein as the aldehyde; (8) the condensation of the pyrimidyl derivative with alkaline formaldehyde in presence of butyl alcohol as modifying agent; (9) as in (8) with acetamide as the modifying agent; (10) as in (8) with diethyl malonate as the modifying agent; (11) as in (8) with glycerine as the modifying agent; (12) as in (8) with polyvinyl alcohol as the modifying agent; (13) condensation of the pyrimidine derivative with formaldehyde by heating in alkaline medium, addition of chloracetamide as curing catalyst and production of a moulding powder in the usual way.  Dyes, pigments, plasticisers, mould lubricants or fillers such as wood flour, glass fibres, asbestos, mineral wool, mica and cloth cutting may be compounded with the resins in the conventional manner.  4.6-Diamino pyrimidyl-2 thio acetyl urea may be prepared by heating 2-mercapto-4.6-diamino-pyrimidine with chloroacetyl urea in alkaline solution.  The crystalline product is filtered off, washed and dried. It is soluble in benzyl alcohol, ethylene glycol monoethyl ether or 10 per cent caustic soda and is partially soluble in dioxane.  As open to public inspection under Sect. 91 of the Acts, the Specification includes the manufacture of aldehydic condensation products from compounds of the general formula <FORM:0579197/IV/1> where n=1, 2 or 3, x=1 or 2, Z=oxygen or sulphur and R=hydrogen, or a monovalent hydrocarbon or substituted hydrocarbon radical.  A large number of compounds is referred to.  The lists of aldehydes, modifying agents and curing catalysts which may be employed are also much longer than those in the Specification as accepted.  The reaction may be performed under acid, alkaline or neutral conditions. Specifications 9244/41, 1458/42 and 8941/42 also are referred to. This matter forms no part of the Specification as accepted.