pH-sensitive modified cellulose ester
US5925181A · kind A · utility
5Cited by
17References
6Claims
0Family size
Inventors
Key dates
| Filing date | Mar 18, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Mar 18, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D17/0039
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Cellulose esters according to formula (I): EQU (C.sub.6 H.sub.7 O.sub.2)(OR).sub.x (OR').sub.y (OH).sub.3-x-y !.sub.n (I) are described, where R is hydrophobic, R' is hydrophilic and not phthalyl or trimellityl, which may be designed, by the proper selection of R, R', x, y, and n, to dissolve under mild to alkaline conditions, and not before. A coating comprising a modified ester according to formula (I) may be used for controlled-release applications, particularly for a cleaning formulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.