Polyoxyalkylene monoalkyl ether, process for producing the same, polymerizable polyoxyalkylene monoalky ether derivative, polymer of said derivative and dispersant comprising said polymer
US6642422B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1999 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Jun 15, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L71/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyoxyalkylene monoalkyl ether which gives, in gel permeation chromatography, a chromatogram which satisfies a relation expressed by an equation: S1/S0≦0.15, wherein S1 represents the area under a portion of the chromatogram from the start of elution to the earliest elution time when the intensity of the refractive index has a value of L/3, L representing the shortest distance between the greatest maximum point of the intensity of the refractive index and the base line and S0 represents the area under a portion of the chromatogram from the start of elution to an elution time when the intensity of the refractive index has the greatest maximum value; a process for producing the above ether includes adjusting the content of water in a reactor, which is used in addition polymerization of alkylene oxides with addition to a monohydric alcohol, so as to satisfy an equation: Wi×(Cf−Ci)V≦10, wherein the content of water in the reactor is obtained by placing a solvent having a content of water Ci (ppm) in an amount Wi (g) in the reactor having an inner volume V (ml), stirring the solvent to clean the reactor, removing the solvent from the reactor and obtaining a content …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.