Drug – bio-affecting and body treating compositions – Lymphokine
Patent
1986-04-09
1987-08-04
Schenkman, Leonard
Drug, bio-affecting and body treating compositions
Lymphokine
424150, A61K 3179
Patent
active
046845194
ABSTRACT:
The invention relates to the process for making a highly stable polyvinylpyrrolidone-halogen complex by forming a reaction solution in a diffusion zone containing a 3 to 9 percent aqueous solution of polyvinylpyrrolidone and halogen dissolved in an alcohol solution wherein the concentration of alcohol is not less than 40% of the total solutions and wherein a portion of the halogen requirement, up to 35%, may be in the form of hydrogen halide or a salt thereof; reacting the polypyrrolidone and halogen components and forming a water/alcohol azeotrope simultaneously with the corresponding polyvinylpyrrolidone-halogen complex; subjecting the reacted mixture to azeotropic distillation to remove an aqueous alcohol distillate; recycling the distillate to the halogen solubilizing or diffusion zone and subjecting the remaining liquid product solution, containing not more than about 35% solids, to spray drying to recover the polyvinylpyrrolidone/halogen product in the form of a particulate solid wherein each particle is of a uniform brownish yellow color throughout.
REFERENCES:
patent: 4125602 (1978-11-01), Atasoy et al.
patent: 4235884 (1980-11-01), Salkin
patent: 4320114 (1982-03-01), Denzinger et al.
GAF Corporation
Maue Marilyn J.
Schenkman Leonard
Ward Joshua J.
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