Patent EP0161926A2 successfully refreshed from Google Patents.
EP0161926A2
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Polymeric compositions
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1985-05-10
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Granted: —
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Expires: 2005-05-10
Abstract
Abstract Water-immiscible liquids, for example oil-based drilling fluids, are thickened by the addition of an aqueous dispersion of polymeric particles that are water-insoluble, and insoluble but swellable polymer, in the water immiscible liquid. The particles have an unswollen average diameter of less than 10 µm and at least 30% by weight are preferably in the range 0.5 to 5 µm. Preferred polymers are formed from more than 80% by weight hydrophobic monomers, preferably alkyl (meth) acrylates, and up to 20% hydrophilic monomers, preferably unsaturated carboxylic acids, preferably acrylic acid.
Inventors
- 👤 Brian Dymond
- 👤 John Langley
- 👤 Malcolm Hawe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 21:58
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; C09K8/36; C09K3/00; Y; Y10; Y10S; Y10S524/00; Y10S524/923
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
42 words
A water-immiscible liquid thickened by polymeric viscosifer characterised in that the viscosifier comprises water insoluble polymer particles having a dry weight average particle size of below 10 µm and that are insoluble in the water-immiscible liquid but are swollen by the liquid.
Claim 2
Dependent Claim
42 words
A water-immiscible liquid thickened by polymeric viscosifer characterised in that the viscosifier comprises water insoluble polymer particles having a dry weight average particle size of below 10 µm and that are insoluble in the water-immiscible liquid but are swollen by the liquid.
Claim 3
Dependent Claim
32 words
A liquid according to claim 1 in which the particles are swollen to at least 4 times, preferably 6 to 50 times and most preferably 10 to 25 times their dry volume.
Claim 4
Dependent Claim
42 words
A liquid according to either preceding claim in which the water-immiscible liquid is substantially non-polar and the polymer is formed from monomers of which 80 to 100% are hydrophobic, 30 to 100% are polar and hydrophobic and O to 20% are hydrophilic.
Claim 5
Dependent Claim
26 words
A liquid according to any preceding claim in which at least 30% by weight of the particles have an unswollen size of 0.5 to 5 µm.
Claim 6
Dependent Claim
96 words
An aqueous composition which is a viscosifier for a water immiscible liquid and is a liquid containing dispersed polymer particles characterised in that the particles have a dry, weight average, particle size below 10µm, have at least 30% by weight 0.5 to 5 µm, are insoluble in water, are insoluble in the water immiscible liquid but swell to at least 4 times their volume in the water-immiscible organic liquid and. the polymer is formed from monomers of which 80 to 100% are hydrophobic, 30 to 100% are polar and hydrophobic and O to 20% are hydrophilic.
Claim 7
Dependent Claim
96 words
An aqueous composition which is a viscosifier for a water immiscible liquid and is a liquid containing dispersed polymer particles characterised in that the particles have a dry, weight average, particle size below 10µm, have at least 30% by weight 0.5 to 5 µm, are insoluble in water, are insoluble in the water immiscible liquid but swell to at least 4 times their volume in the water-immiscible organic liquid and. the polymer is formed from monomers of which 80 to 100% are hydrophobic, 30 to 100% are polar and hydrophobic and O to 20% are hydrophilic.
Claim 8
Dependent Claim
95 words
An aqueous composition which is a viscosifier for a water immiscible liquid and is a liquid containing dispersed polymer particles characterised in that the polymer is formed from monomers of which 80 to 100% are hydrophic, 30 to 100% are polar and hydrophobic and O to 20% are hydrophilic, and the composition comprises 1 to 20%, by weight of the polymer, of a non-ionic surfactant and the polymer particles have a dry, weight average, particle size of below 10 µm and are insoluble in water and are insoluble in but swollen by water immiscible liquid.
Claim 9
Dependent Claim
95 words
An aqueous composition which is a viscosifier for a water immiscible liquid and is a liquid containing dispersed polymer particles characterised in that the polymer is formed from monomers of which 80 to 100% are hydrophic, 30 to 100% are polar and hydrophobic and O to 20% are hydrophilic, and the composition comprises 1 to 20%, by weight of the polymer, of a non-ionic surfactant and the polymer particles have a dry, weight average, particle size of below 10 µm and are insoluble in water and are insoluble in but swollen by water immiscible liquid.
Claim 10
Dependent Claim
26 words
A liquid according to any preceding claim in which not more than 30% by weight of the recurring groups in the polymer are aromatic hydrocarbon groups.
Claim 11
Dependent Claim
55 words
A liquid according to any preceding claim in which the polymer is formed from 80 to 100% (preferably 90 to 100%) C l - 30 alkyl (meth) acrylate monomers of which 50% to 100% are C 6 - 18 alkyl (meth) acrylate monomers, and O to 20%, preferably O to 5%, by weight hydrophilic monomers.
Claim 12
Dependent Claim
55 words
A liquid according to any preceding claim in which the polymer is formed from 90 to 100% alkyl (meth) acrylate of which at least 50% by weight is C 6 - 10 alkyl (meth) acrylate, preferably 2-ethyl hexyl acrylate, and 0.5 to 10%, preferably 0.5 to 5% by weight water soluble monomer, preferably acrylic acid.
Claim 13
Dependent Claim
46 words
A liquid according to any preceding claim in which the particles are formed of a copolymer of ethylenically unsaturated monomers and have an external hydrophilic shell formed of a monomer that is hydrophilic but that is miscible with the other monomer or monomers in the copolymer.
Claim 14
Dependent Claim
40 words
A liquid according to any preceding claim in which the polymer is formed from monomers that include 0.5 to 5% of a hydrophilic monomer selected from unsaturated carboxylic acids, preferably acrylic acid, acrylamide, dialkylaminoalkyl (meth) acrylates and hydroxyalkyl (meth) acrylates.
Claim 15
Dependent Claim
15 words
A liquid according to any preceding claim in which the polymer is substantially uncross linked.
Claim 16
Dependent Claim
20 words
A liquid according to any preceding claim in which the polymer has a glass transition temperature of less than 25°C.
Claim 17
Dependent Claim
16 words
A liquid according to any preceding claim in which the polymer is film forming at 20°C.
Claim 18
Dependent Claim
18 words
A liquid according to any preceding claim in which the polymer particles have been formed by emulsion polymerisation.
Claim 19
Dependent Claim
37 words
A liquid according to claim 1 in which the polymer particles have been made by emulsion polymerisation and the liquid has been formed by adding to the water-immiscible liquid the resultant aqueous emulsion of the polymer particles.
Claim 20
Dependent Claim
17 words
A liquid according to claim 1 and that is a downhole fluid that is a water-in-oil emulsion.
References Cited (Backward Citations)
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