EP0021497A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Synthesis of polyoxyalkylene glycol monoalkyl ethers
Assignee: Procter and Gamble Co
•
Filing: 1980-06-10
•
Granted: —
•
Expires: 2000-06-10
Abstract
Abstract A solvent free method for preparing monoalkyl ethers of polyoxyalkylene glycols, comprising mixing a polyoxyalkylene glycol, especially polyoxyethylene glycol, with a concentrated aqueous solution of a metal hydroxide, contacting said mixture with a primary alkyl halide, and recovering the monoalkyl ether.
Inventors
- 👤 Thomas Wiliam Gibson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:11
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/337; C07; C07C; C07C41/00; C07C41/01; C07C41/16; C08G65/321
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A solvent-free method for preparing monoalkyl ethers of polyoxyalkylene glycols, comprising: (a) mixing a polyoxyalkylene glycol selected from the group consisting of polyoxyethylene glycols, polyoxypropylene glycols, and mixed polyoxyethylene-polyoxypropylene glycols with a concentrated aqueous solution of a metal hydroxide; and (b) contacting the mixture of Step (a) with an organohalide in a mole ratio of glycol to halide greater than 2:1 and a mole ratio of hydroxide to halide greater than about 1:1.
Claim 2
Dependent Claim
73 words
A solvent-free method for preparing monoalkyl ethers of polyoxyalkylene glycols, comprising: (a) mixing a polyoxyalkylene glycol selected from the group consisting of polyoxyethylene glycols, polyoxypropylene glycols, and mixed polyoxyethylene-polyoxypropylene glycols with a concentrated aqueous solution of a metal hydroxide; and (b) contacting the mixture of Step (a) with an organohalide in a mole ratio of glycol to halide greater than 2:1 and a mole ratio of hydroxide to halide greater than about 1:1.
Claim 3
Dependent Claim
21 words
A method according to Claim 1 wherein the metal hydroxide is an alkali metal hydroxide or an alkaline earth metal hydroxide.
Claim 4
Dependent Claim
18 words
A method according to Claim 2 wherein the metal hydroxide is selected from sodium hydroxide and potassium hydroxide.
Claim 5
Dependent Claim
18 words
- A method according to any one of Claims 1-3 wherein said organohalide is a primary alkyl halide.
Claim 6
Dependent Claim
16 words
A method according to Claim 4 wherein the alkyl halide is an alkyl chloride or bromide.
Claim 7
Independent Claim
21 words
A method according to any one of Claims 1-5 wherein the mole ratio of glycol to halide is greater than 5:1.
Claim 8
Independent Claim
22 words
A method according to any one of Claims 1-6 wherein the mole ratio of hydroxide to halide is from 1.05:1 to 3:1.
Claim 9
Independent Claim
23 words
A method according to any one of Claims 1-6 wherein the mole ratio of hydroxide to alkyl halide is greater than about 5:1.
Claim 10
Independent Claim
21 words
A method according to any one of Claims 1-3 characterised in that the organo halide is a terminal dihalopolyoxy alkylene ether.
Claim 11
Dependent Claim
18 words
A method according to Claim 9 wherein the halogens of said terminal dihalopolyoxyalkylene ether are chlorine or bromine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.