Patent GB-571660-A (GB)
Title: Improvements in and relating to resinous condensation products
IPC: C08G12/34
Filed: 1943-04-06
Abstract: Condensation products are produced by reacting together under alkaline conditions a compound represented by the formula <FORM:0571660/IV/1> (where R is an alkyl group, e.g. CH3 or C2H5) and an aldehyde or an acid curing thermosetting resin.  The term aldehyde includes hydroxy aldehydes, polymeric aldehydes and aldehyde addition products which yield aldehyde under the reaction conditions.  An acid curing thermosetting resin is defined as a partial condensation product of a phenol or an aldehyde reactable amino compound such as a triazole, urea, thiourea, dicyandiamide or melamine with an aldehyde. The condensation product of the compound depicted by the formula given above may be added to an acid curing resin or the ingredients thereof.  Resin syrups produced according to the invention may be converted into moulding powders by known techniques.  These have good storage stability. The condensation may be carried out at normal or elevated temperatures and under a wide variety of pressure conditions.  Any alkaline substance may be used to produce the desired alkaline reaction.  In examples 1, 2 and 3, partial condensation products are produced by alkaline condensation of formaldehyde with urea, melamine, and a mixture of melamine with thiourea, respectively, and p-carbethoxyphenylcarbamylchloromethane is added as a curing catalyst.  In example 5, a casting resin was prepared by addition of p-carbethoxyphenyl-carbamylchloromethane and glycerine to a partial condensation product from phenol and formaldehyde in presence of sodium carbonate.  Example 4 describes the preparation of a condensation product from p-carbethoxyphenylcarbamylchloromethane and formaldehyde either by refluxing them together or by shaking them together at room temperature, and examples 6-10 describe the incorporation of this condensation product into resins prepared from urea and formaldehyde, melamine and formaldehyde, dimethylol urea, 1-phenyl guanazole and formaldehyde, and trimethylol melamine respectively. Examples 1, 2, 3 and 6-10 all describe the preparation of moulding compositions by mixing the product of the example with a -cellulose and zinc stearate and drying and grinding the mixture.  A long list of aldehydes which may be employed in the invention is given, the list including a reference to Specification 1458/42 (as open to inspection under Sect. 91).  The Specification as open to inspection under Sect. 91 covers the use of any compound included in the general formula <FORM:0571660/IV/2> where n is 1 or 2, Z is oxygen or sulphur, Y is a divalent carbocyclic radical and R a member of the class consisting of hydrogen, monovalent hydrocarbon and substituted hydrocarbon radicals, and X is a halogen atom.  Long lists of radicals which R or Y may represent and of specific compounds within the general formula are given.  The Specification also includes mention of some aldehydes, and acid-curing thermosetting resins not mentioned in the Specification as accepted.  An example describes the preparation of a resin syrup and moulding composition from 1-tolyl guanazole formaldehyde and p - carbethoxyphenylcar - bamylchloromethane in alkaline solution.  The reaction may be performed in neutral or acid medium and a list of suitable acid substances to adjust the medium to neutral or acid is given.  This subject-matter does not appear in the Specification as accepted.