A plaster of Paris bandage containing a major pro
portion of powdered plaster of Paris and a minor propor
tion of: (1) an uncured melamine-formaldehyde resin of
molecular ratio melamine to formaldehyde of between
1:15 and 1:25, in amount from 5 to 20% of the weight
of plaster; (2) polyvinyl pyrrolidone of molecular-weight
between 10,000 and 360,000, in amount from 10 to 150%
of the weight resin; (3) a binding-agent in amount from
0.5 to 1.5% of the weight of plaster of Paris and selected
from the class consisting of polyvinyl acetate, cooked
starch, dextrin, water-insoluble, water-swellable dextran
and cold-water-insoluble, hot-water-soluble polyvinyl alco
hol; (4) a plaster of Paris set-accelerator in amount from
0.5 to 2% of the weight of plaster and selected from the
class consisting of potassium sulfate, and zinc sulfate;
(5) a resin polymerization catalyst in amount from 5 to
15% of the weight of resin and selected from the class
consisting of ammonium chloride, ammonium sulfate,
zinc chloride, ‘aluminum sulfate, potassium chloride With
ammonium sulfate, and mixtures of the herein listed
catalysts.
A plaster of Paris bandage containing a major proportion of powdered plaster of Paris and a minor proportion of: (1) an uncured melamine-formaldehyde resin ofmolecular ratio melamine to formaldehyde of between1:15 and 1:25, in amount from 5 to 20% of the weightof plaster; (2) polyvinyl pyrrolidone of molecular-weightbetween 10,000 and 360,000, in amount from 10 to 150%of the weight resin; (3) a binding-agent in amount from0.5 to 1.5% of the weight of plaster of Paris and selectedfrom the class consisting of polyvinyl acetate, cookedstarch, dextrin, water-insoluble, water-swellable dextranand cold-water-insoluble, hot-water-soluble polyvinyl alcohol; (4) a plaster of Paris set-accelerator in amount from0.5 to 2% of the weight of plaster and selected from theclass consisting of potassium sulfate, and zinc sulfate;(5) a resin polymerization catalyst in amount from 5 to15% of the weight of resin and selected from the classconsisting of ammonium chloride, ammonium sulfate,zinc chloride, ‘aluminum sulfate, potassium chloride Withammonium sulfate, and mixtures of the herein listedcatalysts.
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