Patent GB-373358-A (GB)
Title: Manufacture of solutions of resins
IPC: C08J3/09
Filed: 1931-04-20
Abstract: Solutions useful as lacquers contain a condensation product made from an aromatic amine and formaldehyde in the presence of about an equivalent proportion of acid, together with an aldehyde or a substance yielding aldehyde or a mixture of both, and with or without other resin-forming substances, aldehyde condensation products capable of being hardened, or other materials ordinarily used in the manufacture of lacquers.  The materials may be dissolved in a common solvent, or an excess of the aldehyde or substance yielding aldehyde may be used as the solvent.  The coatings obtained may be hardened by heat, and the rate of hardening may be accelerated or retarded, according to the particular ingredients, by addition of acid or basic substances such as stearic or salicylic acid, furfuramide, or triethanolamine.  The aldehyde or substance yielding aldehyde may be added to the amine-formaldehyde condensation product before of after the dissolution of the latter.  In the examples, (1) a fusible resin made from aniline and formaldehyde in the presence of hydrochloric acid, as described in Specification 342,325, [Group IV], is dissolved in cyclohexanone and furfurol and furfuramide are added to the solution, which may then be diluted with acetone; (2) the resin used in example 1 is dissolved in furfurol, with the addition of a little triethanolamine; (3) an infusible resin, prepared from aniline and an excess of formaldehyde in the presence of hydrochloric acid, is dissolved in cyclohexanone and chlorohydrin, the solution is diluted with toluene, and p-cresoldimethylol is added; (4) a resin prepared from anhydroformaldehyde aniline and hydrochloric acid is dissolved in cyclohexanone and the solution is diluted with acetone; prior to use, crotonic aldehyde and a rapidly hardening phenol-formaldehyde resin are added; (5) the resin used in example 3 is melted with anhydroformaldehyde aniline, and the product is dissolved in cyclohexanone and furfurol; (6) a resin similar to that used in example 1 is treated in the course of its preparation, prior to the elimination of the acid, with a mixture of phenol polyalcohols prepared by condensing an alkaline solution of phenol with formaldehyde in the cold; the mixture is made alkaline with sodium carbonate, and the precipitated resin is isolated and dissolved in cyclohexanone; the solution is diluted with acetone, and diethyl phthalate is added; (7) the resin used in example 1 is dissolved in cyclohexanone together with a mixture of phenol polyalcohols; any of the usual softening agents is added, and the mixture is diluted; prior to use, it is treated with a solution of salicylic acid in furfurol.  Specifications 343,882, 372,075, and 372,076, [all in Group IV], also are referred to.ALSO:Solutions useful as lacquers contain a condensation product made from an aromatic amine and formaldehyde in the presence of about an equivalent proportion of acid, together with an aldehyde or a substance yielding aldehyde or a mixture of both, and with or without other resin-forming substances, aldehyde condensation products capable of being hardened, or other materials ordinarily used in the manufacture of lacquers.  The materials may be dissolved in a common solvent, or an excess of the aldehyde or substance yielding aldehyde may be used as the solvent. The coatings obtained may be hardened by heat, and the rate of hardening may be accelerated or retarded, according to the particular ingredients, by addition of acid or basic substances such as stearic or salicylic acid, furfuramide, or triethanolamine.  The aldehyde or substance yielding aldehyde may be added to the amine-formaldehyde condensation product before or after the dissolution of the latter. In the examples, (1) a fusible resin made from aniline and formaldehyde in the presence of hydrochloric acid, as described in Specification 342,325, is dissolved in cyclohexanone, and furfurol and furfuramide are added to the solution, which may then be diluted with acetone; (2) the resin used in example 1 is dissolved in furfurol, with the addition of a little triethanolamine; (3) an infusible resin, prepared from aniline and an excess of formaldehyde in the presence of hydrochloric acid, is dissolved in cyclohexanone and chlorohydrin, the solution is diluted with toluene, and p-cresoldimethylol is added; (4) a resin prepared from anhydroformaldehyde aniline and hydrochloric acid is dissolved in cyclohexanone and the solution is diluted with acetone; prior to use, crotonic aldehyde and a rapidly hardening phenol-formaldehyde resin are added; (5) the resin used in example (3) is melted with anhydroformaldehyde aniline, and the product is dissolved in cyclohexanone and furfurol; (6) a resin similar to that used in example (1) is treated in the course of its preparation, prior to the elimination of the acid, with a mixture of phenol polyalcohols prepared by condensing an alkaline solution of phenol with formaldehyde in the cold; the mixture is made alkaline with sodium carbonate, and the precipitated resin is isolated and dissolved in cyclohexanone; the solution is diluted with acetone, and diethyl phthalate is added; (7) the resin used in example (1) is dissolved in cyclohexanone together with a mixture of phenol polyalcohols; any of the usual softening agents is added, and the mixture is diluted; prior to use, it is treated with a solution of salicylic acid in furfurol.  Specifications 343,882, 372,075 and 372,076 also are referred to.