Patent EP0215565A1 successfully refreshed from Google Patents.
EP0215565A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dispersing agents
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
•
Filing: 1986-08-06
•
Granted: —
•
Expires: 2006-08-06
Abstract
Abstract A dispersing agent for particles in aqueous media comprises a copolymer formed from ethyleneically unsaturated monomers including a water-soluble monomer and a monomer carying a pendant group AmBnAbR in which B is ethyleneoxy and n is at least 2, m and p are each generally 0 and R is a hydrophobic group, generally a C<sub>12</sub>.<sub>18</sub> alkyl group or alkaryl group. The polymers generally have molecular weights in the range 500-100000. The dispersants are particularly useful for suspending hydrophobic particles in aqueous media, for example to produce coal slurries, or to suspend hydrophilic particles in aqueous media having high electrolyte concentrations, for example for producing paints and, particularly, drilling muds formed in sea water.
Inventors
- 👤 Malcolm Hawe
- 👤 David Farrar
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 13:48
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08F; C08F2/00; C08F2/32; C08F246/00; C08J3/09; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C08J2300/00; C08J2300/10; C08J2300/14; Y; Y10; Y10S; Y10S516/00; Y10S516/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
A dispersion of particles in an aqueous medium containing a polymeric dispersing agent, characterised in that the viscosity of the dispersion is reduced by the presence of a thinning amount of dispersing agent and in that the dispersing agent is a water-soluble copolymer comprising (a) 30-99% of a water-soluble monomer, (b) 0-40% of a water-insoluble monomer and (c) 1-70% of a monomer that carries a pendant group -A m B n ApR wherein B is ethyleneoxy, n is an integer of at least 2, A is propyleneoxy or butyleneoxy, m and p are each an integer less than n and preferably below 5 and most preferably zero, and R is a hydrophobic group containing at least 8 carbon atoms, all percentages being by weight, the copolymer having a molecular weight in the range 500-100000.
Claim 2
Dependent Claim
134 words
A dispersion of particles in an aqueous medium containing a polymeric dispersing agent, characterised in that the viscosity of the dispersion is reduced by the presence of a thinning amount of dispersing agent and in that the dispersing agent is a water-soluble copolymer comprising (a) 30-99% of a water-soluble monomer, (b) 0-40% of a water-insoluble monomer and (c) 1-70% of a monomer that carries a pendant group -A m B n ApR wherein B is ethyleneoxy, n is an integer of at least 2, A is propyleneoxy or butyleneoxy, m and p are each an integer less than n and preferably below 5 and most preferably zero, and R is a hydrophobic group containing at least 8 carbon atoms, all percentages being by weight, the copolymer having a molecular weight in the range 500-100000.
Claim 3
Dependent Claim
38 words
A dispersion according to claim 1 characterised in that m and p are 0, n is 10-30 and R is a C 8-30 alkyl group or an alkaryl group in which the alkyl group contains 6-12 carbon atoms.
Claim 4
Dependent Claim
25 words
A dispersion according to claim 1 or claim 2 in which Q is CH 2 O, R, is H and R is H or CH'.
Claim 5
Dependent Claim
29 words
A dispersion according to claim 1 or claim 2 in which monomer (c) is a compound selected from N-substituted (meth)acrylamides and esters of - (meth)acrylic, maleic and itaconic acids.
Claim 6
Dependent Claim
25 words
A dispersion according to any preceding claim in which the monomer (a) comprises an ionic ethylenically unsaturated compound, preferably an acid, most preferably acrylic acid.
Claim 7
Dependent Claim
22 words
A dispersion according to any preceding claim in which the molecular weight of the polymeric dispersing agent is in the range 1500-10000.
Claim 8
Dependent Claim
29 words
A dispersion according to any preceding claim in which the particles have hydrophobic surfaces and preferably an electrolyte concentration in the aqueous medium is less than 0.5% by weight.
Claim 9
Dependent Claim
11 words
A dispersion according to claim 7 which is a coal slurry.
Claim 10
Dependent Claim
38 words
A dispersion according to any of the claims 1-6 in which the particles have hydrophilic surfaces and the electrolyte concentration in the aqueous medium is above 0.5% by weight, preferably above 1, more preferably above 2% by weight.
Claim 11
Dependent Claim
15 words
A dispersion according to claim 9 which is a pigment slurry or a drilling mud.
References Cited (Backward Citations)
EP0003235A1
Cited
US4384096A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.