Patent GB-350934-A (GB)
Title: Improvements in or relating to the production of artificial resin from polyhydric phenols and aldehydes
IPC: C08G8/28
Filed: 1930-03-11
Abstract: Phenol-aldehyde condensation products are formed by first employing part of the carbonyl required to react with the hydroxyl groups of a polyhydric phenol; to the intermediate or semi-condensate thus formed is added the remainder of the carbonyl required, in a separate working procedure, to form the finished condensate.  Mouldable masses are formed by incorporating filling material such as wood-meal and asbestos, together with dyestuffs and also natural and other synthetic resins.  These additional materials may be added at different stages of the production of the finished condensate.  The following examples are described: (1) Into an alcoholic solution of a phenol-formaldehyde resin, resorcinol and formaldehyde, and a little colouring matter are introduced.  The whole is added to an excess quantity of wood-meal and well mixed and dried, rolled, ground, sifted, and finally mixed with paraformaldehyde.  Examples (2) and (3) are similar, except as to the quantities specified.  (4) To resorcinol dissolved in alcohol, paraformaldehyde is added and the liquid mass heated in a steam bath.  When the reaction ensues cresol-formaldehyde-resin solution is added, colouring matter stirred in, and the whole well mixed with wood-meal.  To the dried mass paraformaldehyde is added.  According to examples (5) and (6), the procedure according to example (4) is applied to the proportions specified for examples (2) and (3).  In (7), the procedure according to example (4) is modified by adding the remainder of the paraformaldehyde prior to finally mixing the whole with the wood-meal, the mass being then dried. Specification 243,470, [Class 2 (iii), Dyes &c.], is referred to.ALSO:Phenol-aldehyde condensation products are formed by first employing part of the carbonyl required to react with the hydroxyl groups of a polyhydric phenol; to the intermediate or semicondensate thus formed is added the remainder of the carbonyl required, in a separate working procedure, to form the finished condensate.  Mouldable masses are formed by incorporating filling material such as wood-meal and asbestos, together with dyestuffs and also natural and other synthetic resins.  These additional materials may be added at different stages of the production of the finished condensate.  The following examples are described: (1) Into an alcoholic solution of a phenol formaldehyde resin, resorcinol and formaldehyde, and a little colouring matter are introduced.  The whole is added to an excess quantity of wood-meal and well mixed and dried, rolled, ground, sifted, and finally mixed with paraformaldehyde.  Examples (2) and (3) are similar, except as to the quantities specified.  (4) To recorcinol dissolved in alcohol, paraformaldehyde is added and the liquid mass heated in a steam bath. When the reaction ensues cresol-formaldehyde-resin solution is added, colouring matter stirred in and the whole well mixed with wood-meal. To the dried mass paraformaldehyde is added.  According to examples (5) and (6), the procedure according to example (4) is applied to the proportions specified for examples (2) and (3).  In (7), the procedure according to example (4) is modified by adding the remainder of the paraformaldehyde prior to finally mixing the whole with the wood-meal, the mass being then dried. Specification 243,470, [Class 2 (iii), Dyes &c.], is referred to.