Improvements in softening paper

  • Inventors:
  • Assignees: Ig Farbenindustrie Ag
  • Publication Date: June 18, 1928
  • Publication Number: GB-292430-A


292,430. Johnson, J. Y., (I. G. Farbenindustrie Akt.-Ges.). March 16, 1927. Divided on 292,655, [Class 145 (iii), Writing appliances &c.]. Parchment paper; pulp, adding special substances to; paper, treating with special materials. -Paper, particularly parchment paper, is softened by treatment with sorbitol or the dehydration products obtainable from sorbitol by splitting off water from the molecule by heat applied, for example, in the presence of catalysts, and, if desired, in an aqueous medium under pressure, and, preferably, in the presence of acids, salts, or bases of the products obtainable by the action of chemical agents on sorbitol or its dehydration products, or with mixtures of any of these substances. Other substances, such as other polyvalent alcohols, i.e., glycerol or glycol, or sodium lactate, or inorganic hygroscopic salts may also be added. Sorbitol and its derivatives may be admixed with paper pulp or applied to the paper at any stage of its manufacture.




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