Patent EP0126528A2 successfully refreshed from Google Patents.
EP0126528A2
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EP
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Polymer dispersions and their preparation
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1984-03-27
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Granted: —
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Expires: 2004-03-27
Abstract
Abstract A dispersion of water soluble or water swellable polymer in water immiscible liquid is made by reverse phase polymerisation utilising a dispersing system comprising a polymerisation stabiliser and the resulting dispersion, optionally after dehydration, may be distributed into water utilising a distributing system. The dispersing system or the distributing system, or both, includes at least one non-ionic compound selected from C 6 - 12 alkanols, C 4-12 alkylene glycol monoethers and their C 1-4 alkanoates, C 6 - 12 polyalkylene glycol monoethers and their C 1-4 alkanoates and benzyl alcohol. Novel dispersions are made by reverse phase polymerisation and, in particular, include a non-ionic compound selected from C 4-12 alkylene glycol monoethers, their C 1-4 alkanoates and C 6-12 polyalkylene glycol monoethers and their C 1-4 alkanoates. When the polymer is water soluble a solution of it in water can be made by distributing the dispersion into water.
Inventors
- 👤 Adrian S. Allen
- 👤 Peter Flesher
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 19:10
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/32; Y; Y10; Y10S; Y10S526/00; Y10S526/91; Y10S526/911
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
175 words
A reverse phase polymerisation process for making a dispersion in water immiscible liquid of water soluble or water swellable polymer and comprising dispersing an aqueous solution of polymerisable monomer in water immiscible liquid in the presence of a dispersing system comprising a polymerisation stabiliser and polymerising the monomer, and optionally adding a distributing system for promoting distribution of the dispersion into water, characterised in that at least one of the dispersing and distributing systems includes at least one non-ionic compound selected from C 6-12 alkanols, C 4-12 alkylene glycol monoethers and their C 1-4 alkanoates, C 6-12 polyalkylene glycol monoethers and their C 1-4 alkanoates and benzyl alcohol and in which, when the dispersing system does not contain at least one of the said non-ionic compounds the distributing system is added and includes at least one of the said non-ionic compounds and is either free of oil-in-water emulsifier or includes oil in water emulsifier in an amount insufficient by itself to result in formation of a stable oil-in-water emulsion upon stirring the dispersion into water.
Claim 2
Dependent Claim
175 words
A reverse phase polymerisation process for making a dispersion in water immiscible liquid of water soluble or water swellable polymer and comprising dispersing an aqueous solution of polymerisable monomer in water immiscible liquid in the presence of a dispersing system comprising a polymerisation stabiliser and polymerising the monomer, and optionally adding a distributing system for promoting distribution of the dispersion into water, characterised in that at least one of the dispersing and distributing systems includes at least one non-ionic compound selected from C 6-12 alkanols, C 4-12 alkylene glycol monoethers and their C 1-4 alkanoates, C 6-12 polyalkylene glycol monoethers and their C 1-4 alkanoates and benzyl alcohol and in which, when the dispersing system does not contain at least one of the said non-ionic compounds the distributing system is added and includes at least one of the said non-ionic compounds and is either free of oil-in-water emulsifier or includes oil in water emulsifier in an amount insufficient by itself to result in formation of a stable oil-in-water emulsion upon stirring the dispersion into water.
Claim 3
Dependent Claim
36 words
A process according to claim 1 in which the said dispersing system includes at least one of the said non-ionic compounds, preferably in an amount of 1 to 6% by weight of the aqueous monomer solution.
Claim 4
Dependent Claim
54 words
A process according to claim 2 in which the non-ionic compounds are selected from C 6-12 alkanols, C6-12 polyalkylene glycol monoethers wherein the etherifying group is Cl-4 alkyl and C 1-4 alkanoates of the said monoethers, and benzyl alcohol and is preferably selected from C 8-10 alkanols and diethyleneglycol monobutyl ether and its acetate.
Claim 5
Dependent Claim
17 words
A process according to claim 2 in which the said non-ionic compound is diethyleneglycol monobutyl ether acetate.
Claim 6
Dependent Claim
46 words
A process according to claim 1 in which the said distributing system is added to the dispersion and includes at least one of the said non-ionic compounds, preferably in an amount of from 2 to 25% by weight based on the weight of water immiscible liquid.
Claim 7
Dependent Claim
61 words
A process according to claim 4 in which the non-ionic compound is selected from C 6-10 alkanols, C4-12 alkylene glycol monoethers wherein the etherifying group is C 1-4 alkyl, C6-12 dialkylene glycol monoethers wherein the etherifying group is C 1-4 alkyl, and benzyl alcohol and is preferably selected from C 6-8 alkanols, ethylene glycol monobutyl ether and diethylene glycol monobutyl ether.
Claim 8
Dependent Claim
17 words
A process according to claim 5 in which the said non-ionic compound is diethylene glycol monobutyl ether.
Claim 9
Dependent Claim
20 words
A process according to any of claims 4 to 6 in which the distributing system is free of oil-in-water emulsifier.
Claim 10
Dependent Claim
21 words
A process according to any of claims 4 to 7 in which the dispersion is dehydrated before adding the distributing system.
Claim 11
Dependent Claim
17 words
A process according to any of claims 4 to 8 in which the polymer is water soluble.
Claim 12
Dependent Claim
20 words
A process according to any preceding claim in which the polymerisation stabiliser is a copolymer of hydrophilic and hydrophobic monomers.
Claim 13
Dependent Claim
30 words
A process according to any preceding claim in which the dispersing system includes water-in-oil emulsifier and the particle size of the monomer droplets and polymer droplets is below 5 microns.
Claim 14
Dependent Claim
58 words
A dispersion in a water immiscible liquid of water soluble or water swellable polymer particles and which has been made by reverse phase polymerisation in the water immiscible liquid characterised in that it includes a non-ionic compound selected from C 4-12 alkylene glycol monoethers, their C l-4 alkanoates, C 6-12 polyalkylene glycol monoethers and their C 1-4 alkanoates.
Claim 15
Dependent Claim
58 words
A dispersion in a water immiscible liquid of water soluble or water swellable polymer particles and which has been made by reverse phase polymerisation in the water immiscible liquid characterised in that it includes a non-ionic compound selected from C 4-12 alkylene glycol monoethers, their C l-4 alkanoates, C 6-12 polyalkylene glycol monoethers and their C 1-4 alkanoates.
Claim 16
Dependent Claim
28 words
A dispersion according to claim 12 in which the non-ionic compound is selected from ethylene glycol monobutyl ether, diethylene glycol monobutyl ether and diethylene glycol monobutyl ether acetate.
Claim 17
Dependent Claim
44 words
A process of forming a solution of a water soluble polymer comprising distributing into water a dispersion according to claim 12 or claim 13, or made by a process according to any of claims 1 to 11, and wherein the polymer is water soluble.
References Cited (Backward Citations)
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