Patent GB-368300-A (GB)
Title: Manufacture of artificial materials containing fillers
IPC: C08L61/22
Filed: 1930-11-28
Abstract: In the manufacture of compositions comprising a filler, and a resin prepared by condensing an aromatic amine with formaldehyde in the presence of acid and precipitating the condensation product by eliminating the acid, the filler is mixed with the condensation product while the latter is in a moist condition, before or after washing out the electrolytes, and the mixture freed from electrolytes is compressed at a raised temperature, if necessary after comminution.  The condensation product may be prepared as described in Specifications 284,589, [Class 2 (iii), Dyes &c.], 342,325, 342,723, and 342,767; the filler may be wood meal, asbestine, powdered leather or cork, or fibrous material such as cotton, wood pulp, sulphite cellulose, sulphate cellulose, soda cellulose, sawdust, waste paper, rags, linen, jute, silk, or wool. The mixture of condensation product and filler may be made into paper, cardboard or the like by the usual methods of manufacture, and the products then pressed, either alone or in several superimposed layers. Alternatively, the mixture may be dried and pressed in powder or loose fibrous or tablet form.  A hardening agent, a flux, a colouring matter or like ingredient may be added to the mixture or to a constituent thereof at any stage prior to compression.  According to the examples, (1) aniline (1 mol.) and formaldehyde (1,2 mol.) are condensed in the presence of hydrochloric acid (1 mol.), and the solution is run into caustic soda solution; the precipitate is washed and mixed in a beater with comminuted paper pulp, and the mixture is diluted and worked up to paper on a normal Fourdrinier machine, preferably so constructed that the water from the pulp can be collected for re-use; (2) aniline (1 mol.) and formaldehyde (1,1 mol.) are condensed in the presence of hydrochloric acid (1 mol.), and the solution is run into caustic soda solution; the suspension so obtained is treated with 0,25 mol. of a polyphenol alcohol obtained by condensing phenol with an excess of formaldehyde in weak alkaline solution, and after stirring, the precipitate is washed, mixed with rag pulp, and worked up to paper as in example 1; (3) a resin obtained as in example (2) from aniline (1 mol.) and formaldehyde (1 mol.) is filtered, washed, mixed with sulphite cellulose, and dried; the product is comminuted, mixed with furfurol, and moulded under heat and pressure; (4) a resin obtained as in example (1) is mixed with ground leather waste and the mixture is moulded under heat and pressure, preferably after drying in vacuo and comminuting. Specification 342,326 also is referred to.ALSO:In the manufacture of compositions comprising a filler, and a resin prepared by condensing an aromatic amine with formaldehyde in the presence of acid and precipitating the condensation product by eliminating the acid, the filler s mixed with the condensation product while the latter is in a moist condition, before or after washing out the electrolytes, and the mixture freed from electrolytes is compressed at a raised temperature, if necessary after comminution.  The condensation product may be prepared as described in Specifications 284,589, [Class 22, Cements &c.], 342,325, [Group IV], 342,723, and 342,767; the filler may be wood meal, asbestine, powdered leather or cork, or fibrous material such as cotton, wood pulp, sulphite cellulose, sulphate cellulose, soda cellulose, sawdust, waste paper, rags, linen, jute, silk or wool.  The mixture of condensation product and filler may be made into paper, cardboard or the like by the usual methods of manufacture, and the products then pressed, either alone or in several superimposed layers.  Alternatively, the mixture may be dried and pressed in powder or loose fibrous or tablet form.  A hardening agent, a flux, a colouring matter or like ingredient may be added to the mixture or to a constituent thereof at any stage prior to compression.  According to the examples, (1) aniline (1 mol.) and formaldehyde (1,2 mol.) are condensed in the presence of hydrochloric acid (1 mol.), and the solution is run into caustic soda solution; the precipitate is washed and mixed in a heater with comminuted paper pulp, and the mixture is diluted and worked up to paper on a normal Four-drinier machine, preferably so constructed that the water from the pulp can be collected for re-use; (2) aniline (1 mol.) and formaldehyde (1,1 mol.) are condensed in the presence of hydrochloric acid (1 mol.) and the solution is run into caustic soda solution; the suspension so obtained is treated with 0,25 mol. of a polyphenol alcohol obtained by condensing phenol with an excess of formaldehyde in weak alkaline solution, and after stirring, the precipitate is washed, mixed with rag pulp, and worked up to paper as in example (1); (3) a resin obtained as in example (2) from aniline (1 mol.) and formaldehyde (1 mol.) is filtered, washed, mixed with sulphite cellulose, and dried; the product is comminuted, mixed with furfurol, and moulded under heat and pressure; (4) a resin obtained as in example (1) is mixed with ground leather waste, and the mixture is moulded under heat and pressure, preferably after drying in vacuo and comminuting. Specification 342,326 also is referred to.