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US 10,377,835 B2Granted
Water-soluble esterified cellulose ethers
AssigneeDow Global Technologies LLC
InventorsOliver Petermann, Matthias Knarr
Life of this patent
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Abstract
1. An esterified cellulose ether which i) comprises groups of the formula —C(O)—R—COOH or a combination of aliphatic monovalent acyl groups and groups of the formula —C(O)—R—COOH, wherein R is a divalent hydrocarbon group, ii) has a weight average molecular weight Mw of up to 70,000 Dalton, iii) has a degree of neutralization of the groups —C(O)—R—COOH of not more than 0.4, and iv) has a solubility in water of at least 2.0 weight percent at 2° C., is useful for preparing enteric capsules.
Claims14
An esterified cellulose ether
- i) comprising groups of the formula —C(O)—CH2—CH2—COOH or a combination of acetyl groups and groups of the formula —C(O)—CH2—CH2—COOH,
- ii) having a weight average molecular weight Mw of up to 70,000 Dalton,
- iii) having a degree of neutralization of the groups —C(O)—CH2—CH2—COOH of not more than 0.4, and
- iv) having a solubility in water of at least 2.0 weight percent at 2° C.
1 more element
Dependencies are inferred from the claim text.