Esterified cellulose ethers comprising phthalyl groups
US10947322B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Jun 20, 2017 |
| Grant date | Mar 16, 2021 |
| Priority date | — |
| Expiry date | Jun 20, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D101/32
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
An esterified cellulose ether is provided wherein the ester groups are phthalyl groups, the degree of substitution of phthalyl groups is from 0.02 to 0.18, the degree of neutralization of phthalyl groups is not more than 0.75, and the esterified cellulose ether has a solubility in water of at least 2.0 weight percent at 2° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.