Patent GB-494927-A (GB)
Title: Manufacture and application of cold swelling starches
Inventor: MOELLER FREDRIK ANDRE
IPC: C08B30/14
Filed: 1937-09-14
Abstract: An aldehyde or a compound yielding an aldehyde, e.g formaldehyde or hexamethylenetetramine, is mixed with starch, which is then converted into cold-swelling starch by heating thin layers of the moist material to gelatinize and quickly dry the starch.  The product is used in making aqueous solutions which on drying yield water-resistant materials.  Salts or weak acids which promote condensation of the starch and aldehyde may be included in the solutions, and substances which form synthetic resin with aldehydes, e.g. phenol, urea or a derivative thereof, may also be added. Ordinary starch may also be included in the solutions. Various dry mixes to be combined in making the solutions are described.  The solutions may be used as adhesives or sizes, thickening agents in paper or textile printing, binding agents for paints, or binding agents for granular, fibrous and powdered materials.  The coatings may be heated to improve their resistance to water.  The Specification as open to inspection under Sect. 91 comprises also the manufacture of insoluble products by treating the starch as in making the cold swelling starch-aldehyde product, but in the presence of the agent promoting condensation, and, if desired, of the second synthetic resin component.  This subject-matter does not appear in the Specification as accepted.ALSO:An aldehyde or a compound yielding an aldehyde, e.g formaldehyde or hexamethylenetetramine, is mixed with starch, which is then converted into cold-swelling starch by heating thin layers of the moist material to gelatinize and quickly dry the starch.  The product is used in making aqueous solutions which on drying yield water-resistant materials.  Salts or weak acids which promote condensation of the starch and aldehyde may be included in the solutions, and substances which form synthetic resin with aldehydes, e.g. phenol, urea or a derivative thereof, may also be added.  Ordinary starch may also be included in the solutions. Various dry mixes to be combined in making the solutions are described.  The solutions may be used as adhesives or sizes, thickening agents in paper or textile printing, binding agents for paints, or binding agents for granular, fibrous and powdered materials.  The coatings may be heated to improve their resistance to water.  The Specification as open to inspection under Sect. 91 comprises also the manufacture of insoluble products by treating the starch as in making the cold swelling starch-aldehyde product, but in the presence of the agent promoting condensation, and, if desired, of the second synthetic resin component.  This subject-matter does not appear in the Specification as accepted.ALSO:An aldehyde or a compound yielding an aldehyde, e.g formaldehyde or hexamethylenetetramine, is mixed with starch, which is then converted into cold-swelling starch by heating thin layers of the moist material to gelatinize and quickly dry the starch.  The product is used in making aqueous solutions which on drying yield water-resistant materials.  Salts or weak acids which promote condensation of the starch and aldehyde may be included in the solutions, and substances which form synthetic resins with aldehydes, e.g. phenol, urea or a derivative thereof, may also be added. Ordinary starch may also be included in the solutions. Various dry mixes to be combined in making the solutions are described.  The solutions may be used as adhesives or sizes, thickening agents in paper or textile printing, binding agents for paints, or binding agents for granular, fibrous and powdered materials.  The coatings may be heated to improve their resistance to water.  The Specification as open to inspection under Sect. 91 comprises also the manufacture of insoluble products by treating the starch as in making the cold-swelling starch-aldehyde product, but in the presence of the agent promoting condensation, and, if desired, of the second synthetic resin component.  This subject-matter does not appear in the Specification as accepted.