prov:value
| - A class of synthetic polymeric materials with which the present invention phosphine oxide anhydrides are very useful comprises the cellulose derivatives, e.g., the cellulose esters such as cellulose acetate, cellulose triacetate, or cellulose acetate butyrate, the cellulose ethers such as methyl or ethyl cellulose, cellulose nitrate, carboxymethyl cellulose, cellophane, rayon, regene
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