Patent GB-342767-A (GB)
Title: Manufacture of artificial masses
IPC: C08G12/08
Filed: 1929-11-07
Abstract: Resinous products are prepared by treating a Schiff's base, made from an aromatic amine and formaldehyde, with an acid in the presence or absence of an aldehyde or an agent yielding aldehyde, and then subjecting the product, after eliminating the acid and preferably after washing, drying, and comminuting, to moulding by pressure.  If the treatment of the Schiff's base with acid is conducted in the absence of an aldehyde, fusible resins are obtained to which an aldehydic hardening agent is added prior to moulding; suitable hardening agents are aldehydes or agents yielding an aldehyde such as paraformaldehyde or hexamethylenetetramine, or aldehyde condensation products which are susceptible to hardening, e.g. phenolaldehyde condensation products, urea- and/or thio-urea-formaldehyde condensation products, or formaldehyde-amine condensation products prepared as described in Specification 284,589, [Class 2 (iii), Dyes &c.]. When an aldehyde is present during the acid treatment, an infusible product is obtained directly, the moulding of which may be facilitated, as described in Specification 342,730, by addition of a fluxing agent, e.g. a fusible phenol-aldehyde condensation product or a fusible aldehyde-amine condensation product prepared as described above or in Specification 342,325 or 342,326.  In any event, the product may be mixed before moulding with a dye, a filler, a softening agent, e.g. a phthalic ester or tricresyl phosphate, an acid or basic catalyst, or a natural or artificial resin other than a fluxing or a hardening agent; such additions may be made before or after eliminating the acid.  According to the examples, (1) anhydroformaldehyde aniline is treated at 80-90 DEG  C. with an equimolecular amount of hydrochloric acid, the mixture is neutralized, and the fusible product, after washing, drying, and comminuting, is mixed with paraformaldehyde and compressed at 150 DEG C.; (2) anhydroformaldehyde aniline (1 mol.) is treated at 60 DEG  C. with hydrochloric acid (1 mol.) and formaldehyde (0,4 mol.), the mixture is neutralized, and the product, after washing, drying, and comminuting, is compressed at 120 DEG  or 150 DEG  C.; the initial mixture may be allowed to gelatinize, and then comminuted, before the acid is eliminated; (3) wood meal is introduced into the reaction mixture used in example 2; (4) the product of example 2 is compressed in the presence of phenol. Specification 342,723 also is referred to.ALSO:Resinous products are prepared by treating a Schiff's base, made from an aromatic amine and formaldehyde, with an acid in the presence or absence of an aldehyde or an agent yielding aldehyde, and then subjecting the product, after eliminating the acid and preferably after washing, drying, and comminuting, to moulding by pressure.  If the treatment of the Schiff's base with acid is conducted in the absence of an aldehyde, fusible resins are obtained to which an aldehydic hardening agent is added prior to moulding; suitable hardening agents are aldehydes or agents yielding an aldehyde, such as paraformaldehyde or hexamethylenetetramine, or aldehyde condensation products which are susceptible to hardening, e.g. phenol-aldehyde condensation products, urea-and (or) thiourea-formaldehyde condensation products, or formaldehyde-amine condensation products prepared as described in Specification 284,589, [Class 2 (iii), Dyes &c.]. When an aldehyde is present during the acid treatment an infusible product is obtained directly, the moulding of which may be facilitated, as described in Specification 342,730 by addition of a fluxing agent, e.g. a fusible phenol-aldehyde condensation product or a fusible aldehyde-amine condensation product prepared as described above or in Specification 342,325, [Group IV], or 342,326.  In any event, the product may be mixed before moulding with a dye, a filler, a softening agent, e.g. a phthalic ester or tricresyl phosphate, an acid or basic catalyst, or a natural or artificial resin other than a fluxing or a hardening agent; such additions may be made before or after eliminating the acid. According to an example, anhydroformaldehyde aniline is treated at 80-90 DEG  C. with an equimolecular amount of hydrochloric acid in the presence of wood meal, the mixture is neutralized, and the fusible product, after washing, drying, and comminuting, is mixed with paraformaldehyde and compressed at 150 DEG  C.  Specification 342,723 also is referred to.