Water-soluble thermoplastic cellulose ethers
First Claim
1. THE PROCESS WHICH COMPRISES SUBJECTING AN ALKALI CELLULOSE INITIALLY HAVING AN ALKALI TO CELLULOSE RATIO OF FROM 0.7 TO 1.5 AND PREPARED BY TREATING CELLOUSE WITH A 30 TO 60 PERCENT AQUOUS ALKALI HYDROXIDE SOLUTION TO THE ACTION OF AN OLEFINE OXIDE FROM THE GROUP CONSISTING OF ETHYLENE OXIDE AND PROPYLENE OXIDE, IN AMOUNT MOLECULARLY EQUIVALENT TO FORM 0.45 TO 0.80 PART BY WEIGHT OF PROPYLENE OXIDE PER PART OF CELLULOSE AT A TEMPERAURE NOT IN EXCESS FO 40*C. UNTIL THE OLEFINE OXIDE IS SUBSTANTIALLY FULLY REACTED, AND TO THE ACTION OF FROM 1.1 TO 2.0 PARTS OF METHYL CHLORIDE PER PART OF CELLULOSE AT A TEMPERATURE FROM 40*C. TO 80*C. UNTIL THE ETHERIFICATION IS SUBSTANTIALLY COMPLETE, TO PRODUCE A HYDROXYALKYL METHYL CELLULOSE WHICH IS BOTH COLD WATER-SOLUBLE AND THEROMPLASTIC.
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Accused Products
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Citations
1 Claim
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1. THE PROCESS WHICH COMPRISES SUBJECTING AN ALKALI CELLULOSE INITIALLY HAVING AN ALKALI TO CELLULOSE RATIO OF FROM 0.7 TO 1.5 AND PREPARED BY TREATING CELLOUSE WITH A 30 TO 60 PERCENT AQUOUS ALKALI HYDROXIDE SOLUTION TO THE ACTION OF AN OLEFINE OXIDE FROM THE GROUP CONSISTING OF ETHYLENE OXIDE AND PROPYLENE OXIDE, IN AMOUNT MOLECULARLY EQUIVALENT TO FORM 0.45 TO 0.80 PART BY WEIGHT OF PROPYLENE OXIDE PER PART OF CELLULOSE AT A TEMPERAURE NOT IN EXCESS FO 40*C. UNTIL THE OLEFINE OXIDE IS SUBSTANTIALLY FULLY REACTED, AND TO THE ACTION OF FROM 1.1 TO 2.0 PARTS OF METHYL CHLORIDE PER PART OF CELLULOSE AT A TEMPERATURE FROM 40*C. TO 80*C. UNTIL THE ETHERIFICATION IS SUBSTANTIALLY COMPLETE, TO PRODUCE A HYDROXYALKYL METHYL CELLULOSE WHICH IS BOTH COLD WATER-SOLUBLE AND THEROMPLASTIC.
Specification
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Current AssigneeAlbert B. Savage
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Original AssigneeAlbert B. Savage
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InventorsSavage, Albert B.
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Application NumberUS03/432,921Time in Patent Office1,426 DaysField of SearchUS Class Current536/91CPC Class CodesC08B 11/193 Mixed ethers, i.e. ethers w...
