Ortho ester-based surfactant, its preparation and use
US7002045B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2003 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Aug 18, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D1/667
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a new ortho ester-based surfactant, where the hydrophobic and hydrophilic parts are connected by ortho ester linkages to the molecule. The ortho ester has the formula where R is hydrogen or an aliphatic group with 1–7 carbon atoms; R1 is hydrogen or an alkyl group with 1–5 carbon atoms; A1 is an alkyleneoxy group with 2–4 carbon atoms, the number of ethyleneoxy groups being at least 50% of the total number of alkyleneoxy groups; n1 is a number between 1 and 30; R2 is an aliphatic group with 5–22 carbon atoms; A2 is an alkyleneoxy group with 3–4 carbon atoms; n2 is a number between 0–30, provided that when R2 is an aliphatic group with 5–6 carbon atoms n2 is at least 1; R3 is selected from the group consisting of (A1)n1R1, (A2)n2R2 and an alkyl group with 1–6 carbon atoms, where A1, n1, R1, A2, n2 and R2 have the same meaning as mentioned above; or a di- or polycondensate via any of the free hydroxy groups of the ortho ester. The ortho ester surfactants are stable in alkaline solutions, but are readily hydrolysed in acidic solutions to yield products that are not surface active. They are suitable to be used as emulsifiers or dispersants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.