Composite cellulose nitrate membrane on polyester support
AssigneeSartorius AG
InventorsHans Beer, Klaus Froese
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Abstract
There is disclosed a composite isotropic cellulose nitrate membrane on a polyester support and a method of making the same, the membrane having particular utility as various types of reagent-containing test strips for use in analytical chemistry and medicinal diagnostics.
Claims6
A composite microporous cellulose nitrate membrane comprising a polymeric blend of cellulose nitrate and cellulose acetate cast from a casting solution onto a polyester support which, after casting, exhibits an isotropic structure wherein said casting solution comprises 6 to 13 wt % water added to a polymeric blend solution comprising the following components in the approximate weight percentage noted:
- ______________________________________ cellulose nitrate 5-15 wt % cellulose acetate 0.075-0.5 wt % ethanol 20-40 wt % butanol 5-15 wt % methyl acetate balance. ______________________________________
Dependencies are inferred from the claim text.