C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/215.1
C08B 5/14 (2006.01)
Patent
CA 1176631
CELLULOSE SULFATE SALT HAVING ANTI-COAGULATING ACTION AND PROCESS FOR PREPARING SAME ABSTRACT OF THE DISCLOSURE A cellulose sulfate salt having a heparinic action is provided, which satisfies requirements of 0.8 ? <<F>> ? 2.6, <<f2>> ? <<f3>> and <<f2>> ? <<f6>> wherein <<f2>>, <<f3>> and <<f6>> stand for probability of substitution of atoms in the OH groups bonded to the C2 , C3 and C6 positions of the glucopyranose rins unit by sulfuric acid radicals, respectively, and <<F>> stands for the total substitution degree which is the sum of <<f2>>, <<f3>> and <<f6>>. The cellulose sulfate salt is prepared by reacting a cellulose having a crystal form I with an SO3/amine or SO3/amide complex in an amount of 2 to 4 mole equivalents per glucose unit of the cellulose at -10°C to 40°C to form a gelatinous product; adding water to the gelatinous product in an amount 0.1 to 5 times the amount of the starting cellulose used for the reaction; treating the mixture at a high temperature to relatively reduce the values of <<f6>> and <<f3>> among the values of <<f2>>, <<f3>> and <<f6>>; neutralizing, precipitating and drying the so obtained crude cellulose sulfate; dissolving the crude cellulose sulfate in water again; treating the solution with an adsorbent; and subjecting the treated cellulose sulfate to precipitation, drying, re-dissolution, dialysis, precipi- tation and then drying.
390539
Kamide Kenji
Matsui Toshihiko
Okajima Kunihiko
Asahi Kasei Kogyo Kabushiki Kaisha
Macrae & Co.
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