Patent GB-372075-A (GB)
Title: Manufacture of artificial masses
IPC: C08L61/34
Filed: 1931-04-20
Abstract: In treating with aldehydic hardening agents the fusible condensation products made from an aromatic amine and at most an equimolecular proportion of formaldehyde in the presence of about an equimolecular proportion of an acid, (cf. Specifications 342,325 and 342,723), the hardening agent is added in the course of manufacture of the condensation product but before the product is dried and comminuted. Similarly, in treating with aldehydic fluxing agents, which do not split off aldehyde, the infusible condensation products made in the presence of an acid from an aromatic amine and more than an equimolecular proportion of formaldehyde, (cf. Specification 342,730), the fluxing agent is added in the course of manufacture of the condensation product but before the product is dried and comminuted.  Thus, a slowly reacting aldehyde, such as benzaldehyde or furfurol, may be dispersed in the acid condensation solution; or an aldehydic substance soluble in bases, such as a phenol-alcohol or a phenol-aldehyde resin, may be dissolved in the base used to eliminate the acid; or the neutral or basic suspension of the separated resin may be mixed with a solution of an aldehydic substance in a water-soluble organic solvent or in an alkali, the mixture in the latter case being afterwards neutralized.  The products may be used for the manufacture of moulded articles, in conjunction if desired with fillers such as wood meal, asbestine, paper pulp, paper, or textile fabrics.  According to the examples, (1) aniline is treated with almost an equimolecular proportion of formaldehyde solution in the presence of hydrochloric acid, and the solution is treated with furfurol and then with caustic soda solution; the precipitated resin is washed; (2) a solution prepared from aniline, formaldehyde, and hydrochloric acid as in example 1 is treated with a solution of phenol-polyalcohols prepared by treating an alkaline solution of phenol with an excess of formaldehyde in the cold; the mixture is poured into dilute caustic soda solution, and finally made alkaline with sodium carbonate, filtered and washed; (3) a solution prepared from aniline, formaldehyde, and hydrochloric acid as in example 1 is treated with a solution in caustic soda of cresol-polyalcohols prepared from crude cresol and formaldehyde as indicated in example 2; the mixture is made alkaline with sodium carbonate, and the resin is filtered, washed, dried, and ground with furfurol; (4) aniline is treated with more than an equimolecular proportion of formaldehyde in the presence of hydrochloric acid, and the solution is treated with a solution of a phenol-formaldehyde resin in so much caustic soda solution that the mixture has only a feeble acid reaction; the mixture is neutralized with sodium carbonate, heated and the resin filtered off; (5) a solution prepared from aniline, formaldehyde, and hydrochloric acid as in example 4 is run into a strongly alkaline solution of phenol-alcohols prepared by condensing equimolecular amounts of phenol and formaldehyde in dilute alkaline solution; the mixture is rendered alkaline with sodium carbonate, and the precipitate is filtered.  Specifications 342,326 and 342,767 also are referred to.  The Specification as open to inspection under Sect. 91 (3) (a) includes a further example, according to which a solution obtained by treating aqueous anhydroformaldehyde aniline with hydrochloric acid is run into a solution of phenol-polyalcohols, prepared as described in example 2 above and containing sufficient sodium carbonate to neutralize the hydrochloric acid; the precipitate is filtered, washed and dried. This subject-matter does not appear in the Specification as accepted.ALSO:In treating with aldehydic hardening agents the fusible condensation products made from an aromatic amine and at most an equimolecular proportion of formaldehyde in the presence of about an equimolecular proportion of an acid, (cf. Specifications 342,325, [Group IV], and 342,723), the hardening agent is added in the course of manufacture of the condensation product but before the product is dried and comminuted.  Similarly, in treating with aldehydic fluxing agents, which do not split off aldehyde, the infusible condensation products made in the presence of an acid from an aromatic amine and more than an equimolecular proportion of formaldehyde (cf. Specification 342,730), the fluxing agent is added in the course of manufacture of the condensation product but before the product is dried and comminuted.  Thus, a slowly reacting aldehyde, such as benzaldehyde or furfurol, may be dispersed in the acid condensation solution; or an aldehydic substance soluble in bases, such as a phenol-alcohol or a phenol-aldehyde resin, may be dissolved in the base used to eliminate the acid; or the neutral or basic suspension of the separated resin may be mixed with a solution of an aldehydic substance in a water-soluble organic solvent or in an alkali, the mixture in the latter case being afterwards neutralized.  The products may be used for the manufacture of moulded articles, in conjunction if desired with fillers such as wood meal, asbestine, paper pulp, paper, or textile fabrics.  According to the examples: (1) aniline is treated with almost an equimolecular proportion of formaldehyde solution in the presence of hydrochloric acid, and the solution is treated with furfurol and then with caustic soda solution; the precipitated resin is washed; (2) a solution prepared from aniline, formaldehyde, and hydrochloric acid as in example 1 is treated with a solution of phenolpolyalcohols prepared by treating an alkaline solution of phenol with an excess of formaldehyde in the cold; the mixture is poured into dilute caustic soda solution, and finally made alkaline with sodium carbonate, filtered, and washed; (3) a solution prepared from aniline, formaldehyde, and hydrochloric acid as in example 1 is treated with a solution in caustic soda of cresol-polyalcohols prepared from crude cresol and formaldehyde as indicated in example 2; the mixture is made alkaline with sodium carbonate, and the resin is filtered, washed, dried, and ground with furfurol; (4) aniline is treated with more than an equimolecular proportion of formaldehyde in the presence of hydrochloric acid, and the solution is treated with a solution of a phenol-formaldehyde resin in so much caustic soda solution that the mixture has only a feeble acid reaction; the mixture is neutralized with sodium carbonate, heated, and the resin filtered off; (5) a solution prepared from aniline, formaldehyde, and hydrochloric acid as in example 4 is run into a strongly alkaline solution of phenolalcohols prepared by condensing equimolecular amounts of phenol and formaldehyde in dilute alkaline solution; the mixture is rendered alkaline with sodium carbonate, and the precipitate is filtered. Specifications 342,326 and 342,767 also are referred to.  The Specification as open to inspection under Sect. 91 (3) (a) includes a further example, according to which a solution obtained by treating aqueous anhydroformaldehyde aniline with hydrochloric acid is run into a solution of phenol-polyalcohols, prepared as described in example 2 above and containing sufficient sodium carbonate to neutralize the hydrochloric acid; the precipitate is filtered, washed, and dried.  This subject-matter does not appear in the Specification as accepted.