Oxidized cellulose product and method for preparing the same

• US 3,364,200 A
• Filed: 05/19/1965
• Issued: 01/16/1968
• Est. Priority Date: 03/28/1960
• Status: Expired due to Term

• Current Assignee: Ashton, William H., Moser, Charles E.
• Original Assignee: Ashton, William H., Moser, Charles E.
• Inventors: Ashton, William H., Moser, Charles E.
• Application Number:
  US04/463,440
• Time in Patent Office: 972 Days
• US Class Current: 536/56
• CPC Class Codes: A61L 15/28 Polysaccharides or their derivatives A61L15/225 takes precedence
• CPC Class Codes: A61L 15/64 specially adapted to be resorbable inside the body
• CPC Class Codes: A61L 2400/04 Materials for stopping bleeding
• CPC Class Codes: C08B 15/04 Carboxycellulose, e.g. prepared by oxidation with nitrogen dioxide
• CPC Class Codes: C08L 1/04 Oxycellulose; Hydrocellulose , e.g. microcrystalline cellulose
• CPC Class Codes: D04B 1/14 Other fabrics or articles characterised primarily by the use of particular thread materials
• CPC Class Codes: D10B 2201/01 Natural vegetable fibres
• CPC Class Codes: D10B 2201/24 Viscose

Claims

1. IN THE PREPARATION OF OXIDIZED CELLULOSE BY THE PROCESS OF TREATING CELLULOSE WOUND IN LAYERS AROUND A PERFORATED CORE WITH AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF NITROGEN TETROXIDE AND MIXTURES THEREOF, WASHING THE RESULTING OXIDIZED CELLULOSE WITH A NONTOXIC WATER-IMMISCIBLE SOLVENT FOR SAID OXIDIZING AGENT, WASHING SAID OXIDIZED CELLULOSE FIRST WITH A WATER SOLUBLE LOWER ALIPHATIC ALCOHOL, AND SUBSEQUENTLY WASHING THE OXIDIZED CELLULOSE WITH A SUBSTNATIALLY ANHYDROUS LOWER ALIPHATIC ALCOHOL HAVING AN AFFINITY FOR WATER, WHEREIN SAID OXIDATION BY SAID OXIDIZING AGENT AND SAID WASHINGS ARE EFFECTED BY PASSING THEM THROUGH SAID PREFORATED CORE AND THE SURROUNDING CELLULOSE LAYERS, THE IMPROVEMENT WHEREIN WASHES CONSISTING OF AN AQUEOUS SOLUTION OF A WATER SOLUBLE LOWER ALIPHATIC ALCOHOL CONTAINING SAID ALCOHOL IN A CONCENTRATION RANGE FROM ABOUT 20 PERCENT TO 80 PERCENT ALCOHOL BY VOLUME ARE SUBSTITUTED FOR THE FIRST OF SAID ALCOHOL WASHES.