Patent GB-216949-A (GB)
Title: Manufacture and applications of new lignone derivatives
IPC: D21C11/00
Filed: 1923-03-09
Abstract: Soluble lignone derivatives obtained by the treatment of ligno-cellulosic materials with sulphurous acid, as described, for example, in Specification 202,016, [Class 2 (iii), Dyes &c.], are converted into insoluble derivatives by oxidation.  Chromic acid or sodium bichromate may be used as oxidizing agents, or an insoluble chromate, such as lead chromate, may be used with solutions sufficiently viscous to hold the chromate in suspension. The products are colloidal and gelatinize spontaneously at a rate depending on the proportion of chromium trioxide with respect to the lignone solids. In dilute solution the products may be used in sizing or filling textile materials, for which purpose they may be applied directly after formation so that gelatinization takes place within the substance of the treated material.  An example of the process is given.  The Provisional Specification states that oxidation may be effected atmospherically with the assistance, it may be, of catalysts such as copper or iron compounds.ALSO:Soluble lignone derivatives obtained by the treatment of ligno-cellulosic materials with sulphurous acid, as described, for example, in Specification 202,016, are converted into insoluble derivatives by oxidation.  Chromic acid or sodium bichromate may be used as oxidizing agents, or an insoluble chromate, such as lead chromate, may be used with solutions sufficiently viscous to hold the chromate in suspension.  The products are colloidal and gelatinize spontaneously at a rate depending on the proportion of chromium trioxide with respect to the lignone solids.  In dilute solution the products may be used in sizing or filling textile materials and in coating wood, for which purposes they may be applied directly after formation so that gelatinization takes place within the substance of the treated material; dilute solutions of the products may also be used as mordants.  More concentrated solutions may be used to coat wood surfaces to produce the effect of a paint or varnish.  An example of the process is given.  The Provisional Specification describes the use of the products as parent materials for the production of sulphurized dyes by treatment at elevated temperatures with alkalies and alkaline sulphides.  It states also that oxidation may be effected atmospherically with the assistance, it may be, of catalysts such as copper or iron compounds.  Further, it refers to the use of soluble lignone derivatives such as those obtained by the process described in Specification 202,016, as solvents for oils and hydrocarbons and to their consequent application in the manufacture of insecticides, bactericides, and pharmaceutical preparations.ALSO:Soluble lignone derivatives obtained by the treatment of ligno-cellulosic materials with sulphurous acid, as described, for example, in Specification 202,016.  [Class 2 (iii), Dyes &c.], are converted into insoluble derivatives by oxidation. Chromic acid or sodium bichromate may be used as oxidizing agents, or an insoluble chromate, such as lead chromate, may be used with solutions sufficiently viscous to hold the chromate in suspension. The products are colloidal and gelatinize spontaneously at a rate depending on the proportion of chromium trioxide with respect to the lignone solids.  In dilute solution the products may be used as mordants.  An example of the process is given.  The Provisional Specification states that oxidation may be effected atmospherically with the assistance, it may be, of catalysts such as copper or iron compounds.