Cellulose ether acetate phthalates
US10513599B2 · kind B2 · utility
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Key dates
| Filing date | Aug 22, 2017 |
| Grant date | Dec 24, 2019 |
| Priority date | — |
| Expiry date | Aug 22, 2037 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/4833
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A cellulose ether acetate phthalate is provided, wherein the degree of substitution of phthalyl groups is from 0.02 to 0.25, the degree of neutralization of phthalyl groups is not more than 0.5, the degree of substitution of acetyl groups is from 0.02 to 0.40, and the total degree of substitution of phthalyl and acetyl groups is not more than 0.50. The cellulose ether acetate phthalate 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.