Patent GB-342326-A (GB)
Title: Manufacture of artificial masses
IPC: C08L61/22
Filed: 1929-10-23
Abstract: In the manufacture of moulding compositions comprising a filler, and a binder prepared by condensing an aromatic amine in an acid medium with formaldehyde, with or without another aldehyde, as described in the parent Specifications, the filler is impregnated with the condensation product at any stage prior to the elimination of the acid, i.e. while the product is still in the dissolved state.  The acid is then eliminated, whereby the condensation product is precipitated in and on the filler, and the mixture is then moulded under pressure, preferably at a raised temperature and, if necessary, with the addition of an aldehyde, or agent yielding aldehyde (cf. Specification 342,325). Pulverulent materials may be used as fillers, or alternatively paper, fabric, &c. may be impregnated with the condensation solution and worked up, as described above, to laminated moulded pieces.  According to the examples, (1) aniline is condensed with slightly more than an equimolecular amount of formaldehyde in the presence of hydrochloric acid, and wood meal is added to the solution; the acid is then eliminated by addition of sodium hydroxide, and the mixture is filtered, washed, dried, and pressed at 150 DEG  C.; (2) canvas is impregnated with the solution obtained in example 1, and then laid in caustic soda lye, washed, and dried; laminated plates are obtained by pressing layers of the product together at 150 DEG  C., with or without intermediate layers of unfilled resin; (3) cellulose paper is treated as in example 2; (4) dry paper pulp, wood shavings, or cellulose waste is impregnated with the solution obtained in example 1, and the p  mixture is neutralized; the product may be used as a moulding powder, or worked into paper which can then be pressed directly into plates; (5) a product containing asbestine as the filler is prepared as in example 1; (6) equimolecular proportions of aniline and formaldehyde are condensed in the presence of hydrochloric acid, and wood meal is added to the solution; after neutralizing, filtering, washing and drying, the product is mixed with a little paraformaldehyde and moulded at a raised temperature.  The products may be used for making horns for loud speakers, and other acoustic appliances.  Various other uses of the products are mentioned.ALSO:In the manufacture of moulding compositions comprising a filler, and a binder prepared by condensing an aromatic amine in an acid medium with formaldehyde, with or without another aldehyde, as described in the parent Specifications, the filler is impregnated with the condensation product at any stage prior to the elimination of the acid, e.g. while the product is still in the dissolved state.  The acid is then eliminated, whereby the condensation product is precipitated in and on the filler, and the mixture is then moulded under pressure, preferably at a raised temperature and, if necessary, with the addition of an aldehyde, or agent yielding aldehyde (cf. Specification 342,325, [Group IV]. Pulverulent or fibrous fillers may be used.  According to examples: (1) Aniline is condensed with slightly more than an equimolecular amount of formaldehyde in the presence of hydrochloric acid, and wood meal is added to the solution; the acid is then eliminated by addition of sodium hydroxide, and the mixture is filtered, washed, dried, and pressed at 150 DEG  C.; (2) dry paper pulp, wood shavings, or cellulose waste is impregnated with the solution obtained in example (1), and the mixture is neutralized; the product may be used as a moulding powder, or worked into paper which can then be pressed directly into plates; (3) a product containing asbestine as the filler is prepared as in example (1); (3) equimolecular proportions of aniline and formaldehyde are condensed in the presence of hydrochloric acid, and wood meal is added to the solution; after neutralizing, filtering, washing and drying, the product is mixed with a little paraformaldehyde and moulded at a raised temperature.