A) a group of the formula -C(O)-R-COOA, or an aliphatic monovalent acyl group and a group of the formula -C(O)-R-COOA, where R is a divalent aliphatic or aromatic hydrocarbon group, and A is Combination of hydrogen or cation), and B) [Wf(100k)-Wf(100k)XL] / Wf(100k)XL where Wf(100k) is greater than 100,000 g/mol esterification Partially cross-linked, with a molecular weight distribution such that the total weight fraction of the cellulose ether is Wf(100k)XL is a weight fraction of methylated esterified cellulose ether greater than 100,000 g/mol) Esterified cellulose ethers are enteric polymers and are useful in pharmaceutical dosage forms.
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机译：A）式-C（O）-R-COOA的基团或脂族一价酰基和式-C（O）-R-COOA的基团，其中R为二价脂族或芳族烃基，和A是氢或阳离子的组合，和B）[Wf（> 100k）-Wf（> 100k）XL] / Wf（> 100k）XL，其中Wf（> 100k）大于100,000 g / mol酯化反应部分交叉分子量分布使得纤维素醚的总重量分数为Wf（> 100k）XL是甲基化的酯化纤维素醚的重量分数大于100,000 g / mol）酯化的纤维素醚是肠溶聚合物，是有用的在药物剂型中。
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