Patents Assigned to Allied Colloids Limited
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Patent number: 5100467Abstract: Iron ore particles or other water insoluble non-swellable particulate material is converted into pellets or other agglomerates by mixing with substantially dry binder in the presence of moisture and is then bonded into agglomerates. The binder comprises substantially dry bentonite and particulate polymeric material, and the bentonite is blended with the insoluble particulate material and moisture before addition of the polymeric material.Type: GrantFiled: August 16, 1990Date of Patent: March 31, 1992Assignee: Allied Colloids LimitedInventors: Anthony P. Allen, John R. Field
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Patent number: 5100660Abstract: This invention relates to aqueous acidic solutions which are thickened by cationic polymer, the polymer being added to the solution in the form of particles below 10 .mu.m in size. The useful cationic polymers are formed from a water soluble cationic ethylenically unsaturated monomer or blend of monomers comprising dialkylaminoalkylacrylics that includes a polyethylenically unsaturated cross-linking agent. A peak viscosity is achieved in the aqueous acidic solution at a particular cross-linker concentration.The concentration of cross-linking agent chosen is carefully controlled so that the viscosifying effect can be optimised whilst minimising the amount of polymer that has to be added. The amount of polymer in the aqueous acidic solution is typically in the range of from, 0.01% to 5% dry weight polymer.Type: GrantFiled: April 20, 1990Date of Patent: March 31, 1992Assignee: Allied Colloids LimitedInventors: Malcolm Hawe, David Farrar
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Patent number: 5099049Abstract: A compound that is the water insoluble hydrochloride addition salt of the dihydrogen ferric complex of diethylene triamine penta-acetic acid, DTPAH.sub.5, namely DTPAFeH.sub.3 Cl, which has been made in pure form from DTPANa.sub.5, and which can be used in an agricultural nutrient composition.Type: GrantFiled: March 22, 1991Date of Patent: March 24, 1992Assignee: Allied Colloids LimitedInventor: Peter Chamberlain
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Patent number: 5008089Abstract: Red mud in Bayer process liquors are flocculated using dextran and synthetic anionic polymer in the same stage, usually added separately to the liquor. The liquor may be the primary settler slurry, the secondary clarification liquor or one or more of the red mud washing stages. The process is of particular advantage where the liquors are high in carbonate content and/or total alkalinity.Type: GrantFiled: October 13, 1989Date of Patent: April 16, 1991Assignee: Allied Colloids LimitedInventors: Gillian M. Moody, Christine A. Rushforth
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Patent number: 4997714Abstract: Film or fibre is made from a polymer of water soluble ethylenically unsaturated monomeric material that includes ionic monomer by extrusion and stretching, and a counterionic lubricant compound is absorbed into the surface of the fibre or film before or during the stretching. The counterionic lubricant compound is also of use for providing a lubricated film on other extruded or comminuted elements of water swellable or water soluble polymeric material.Type: GrantFiled: May 19, 1989Date of Patent: March 5, 1991Assignee: Allied Colloids LimitedInventors: David Farrar, Adrian Allen, Peter Flesher
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Patent number: 4980434Abstract: The properties of absorptive synthetic polymer particles formed by polymerisation of water soluble monomers such as sodium acrylate or acrylamide with a cross linking agent are improved, especially as regards absorptive capacity for aqueous electrolytes, by copolymerising the monomers with an ethylenically unsaturated monomer that includes a pendant group --A.sub.m B.sub.n A.sub.p R where B is ethyleneoxy, n is at least 2, A is propyleneoxy or butyleneoxy, m and p are each less than n and are preferably zero, and R is a hydrophobic group.Type: GrantFiled: February 29, 1988Date of Patent: December 25, 1990Assignee: Allied Colloids LimitedInventors: David Farrar, Peter Flesher, Malcolm Hawe
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Patent number: 4950725Abstract: Polymer thickeners suitable for use as textile pigment print paste thickeners are particulate cross linked polymers having a particle size of below 20 .mu.m and have defined physical characterization that indicates an optimum degree of cross linking and molecular size within the polymer.Type: GrantFiled: May 19, 1989Date of Patent: August 21, 1990Assignee: Allied Colloids LimitedInventors: Peter Flesher, David Farrar, Adrian Allen
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Patent number: 4950788Abstract: Acrylic acid or other unsaturated carboxylic acid is made by hydrolysing the corresponding nitrile in the presence of excess sulphuric acid to form amide sulphate, adding amide in an amount such that the total amount of amide and nitrile fed to the process is greater than 1 mole per mole sulphuric acid, hydrolysing the amide sulphate and amide to the desired acid and separating the acid from the sulphate by-products.Type: GrantFiled: February 23, 1989Date of Patent: August 21, 1990Assignee: Allied Colloids LimitedInventors: David Farrar, Peter Flesher
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Patent number: 4940763Abstract: Water soluble, substantially linear, polymers having single point intrinsic viscosity above about 3 are formed from an ethylenically unsaturated monomer that includes a group --B.sub.n A.sub.m R where A is propoxy or butoxy, B is ethoxy, n is zero or an integer of 2 to 100 and m is zero or an integer less than n, and R is a hydrophobic group of at least 8 carbon atoms and comonomer selected from non-ionic monomers and dialkylamino alkyl (meth) -acrylates or -acrylamides wherein at least one of the monomers is tertiary amine acid addition or quaternary ammonium salt. The resultant water soluble, high molecular weight, cationic polymers are useful as flocculants and as viscosifiers of aqueous acid solutions such as downhole acid stimulation fluids.Type: GrantFiled: October 26, 1987Date of Patent: July 10, 1990Assignee: Allied Colloids LimitedInventors: Peter Flesher, David Farrar, Malcolm Hawe, John Langley
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Treatment of polyacrylamide gel particles with amidase to reduce residual acrylamide content thereof
Patent number: 4906732Abstract: A substantially dry, particulate polyacrylamide composition having reduced acrylamide monomer content is made by mixing amidase with coarse aqueous gel polymer particles, absorbing the amidase into the particles and subsequently drying the particles.Type: GrantFiled: February 9, 1989Date of Patent: March 6, 1990Assignee: Allied Colloids LimitedInventors: David Farrar, Peter Flesher -
Patent number: 4892916Abstract: Polymers are made by polymerization of an ionic monomer such as methacrylic acid or dialkylaminoalkyl (meth)-acrylate or -acrylamide and/or a substantially non-ionic monomer, optionally a cross linking agent, and an allyl ether of the formula CH.sub.2 .dbd.CR'CH.sub.2 OA.sub.m B.sub.n A.sub.p R where R' is hydrogen or methyl, A is propyleneoxy or butyleneoxy, B is ethyleneoxy, n is zero or an integer, m and p are zero or an integer less than n, and R is a hydrophobic group of at least 8 carbon atoms. The polymers are preferably made by oil in water emulsion polymerization. They can be used as thickeners particularly in environments containing surfactant and/or electrolyte, including especially emulsion paints, print pastes, alkaline liquors and acidic liquors.Type: GrantFiled: September 22, 1987Date of Patent: January 9, 1990Assignee: Allied Colloids LimitedInventors: Malcolm Hawe, David Farrar
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Patent number: 4880858Abstract: A wet filter cake of coal fines or other inorganic particulate material is converted to a crumbly mass by blending with water absorbent polymer particles.Type: GrantFiled: August 31, 1987Date of Patent: November 14, 1989Assignee: Allied Colloids LimitedInventors: David Farrar, Peter Flesher, Malcolm Skinner, John Clarke, David Marshall, Malcolm Hawe
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Patent number: 4876047Abstract: 2-acrylamido 2-methyl propane sulphonic acid and other acrylamido-alkane sulphonic acids are made by reacting a compound such as t-butanol, t-butyl acetate or t-butyl methyl ester with a sulphonating agent in the absence of water, and then with a nitrile and water.Type: GrantFiled: December 17, 1987Date of Patent: October 24, 1989Assignee: Allied Colloids LimitedInventors: Gerald Benn, David Farrar, Peter Flesher
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Patent number: 4822620Abstract: Silage effluent is retained within the silo by adding a water-absorbent, water-swellable particles of synthetic polymer with the grass, maize etc. Preferably the polymer is an acrylic acid polymer or a dimethylaminoethyl acrylate polymer. The polymer may be used in conjunction with other additives e.g. lactic-acid producing bacterial inoculants, acid compounds or sterilizing compositions.Type: GrantFiled: March 18, 1987Date of Patent: April 18, 1989Assignee: Allied Colloids LimitedInventors: Peter Chamberlain, Simon Couldwell
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Patent number: 4798861Abstract: The properties of water soluble or, especially water swellable polymer particles are improved by surface cross linking that is caused by providing a dispersion of gel polymer particles in an organic solvent, reacting the surfaces of these particles with dissolved cross linking agent and azeotropically distilling the dispersion.Type: GrantFiled: November 24, 1986Date of Patent: January 17, 1989Assignee: Allied Colloids LimitedInventors: Ian M. Johnson, Ian M. Moody, Peter Flesher
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Patent number: 4792343Abstract: 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 A.sub.m B.sub.n A.sub.p R 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.12-18 alkyl group or alkaryl group. The polymers generally have molecular weights in the range 500-100,000. 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.Type: GrantFiled: August 7, 1986Date of Patent: December 20, 1988Assignee: Allied Colloids LimitedInventors: Malcolm Hawe, David Farrar
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Patent number: 4778836Abstract: A water soluble or swellable polymer gel is dispersed into a liquid phase to form a fluid composition and is worked while in that composition. The liquid phase is an aqueous solution of an equilibrating agent that substantially prevents aggregation of the particles or dissolution of the polymer during the working. The working may be, for instance, milling, extraction of impurities, extraction of water, transportation or chemical modification. Preferred equilibrating agents are sodium polyacrylate and polydiallyl dimethyl ammonium chloride.Type: GrantFiled: June 27, 1985Date of Patent: October 18, 1988Assignee: Allied Colloids LimitedInventors: David Farrar, John Robinson, Peter Flesher
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Patent number: 4753710Abstract: Paper or paper board is made by passing an aqueous cellulosic suspension through a centriscreen or other shear device and then draining the purified suspension, and an improved combination of retention, drainage, drying and formation is achieved by adding to the suspension an excess of high molecular weight linear synthetic cationic polymer before shearing the suspension and adding bentonite after shearing.Type: GrantFiled: January 27, 1987Date of Patent: June 28, 1988Assignee: Allied Colloids LimitedInventors: John Langley, David Holroyd
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Patent number: 4741790Abstract: The combination of adhesion and rheology properties of aqueous adhesives the adhesive component of which is a water soluble or water swellable polymeric material can be improved by copolymerizing the monomers from which the polymeric material is obtained with an ethylenically unsaturated monomer that includes a pendant group --A.sub.m B.sub.n A.sub.p R where B is ethoxy, n is at least 2, A is propoxy or butoxy, m and p are each less than n and are preferably zero, and R is a hydrophobic group.Type: GrantFiled: August 7, 1986Date of Patent: May 3, 1988Assignee: Allied Colloids LimitedInventors: Malcolm Hawe, David Farrar
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Patent number: 4740325Abstract: A thermal energy storage composition is formed of a thermal energy storage hydrate and a solid, water swellable, thermally conducting polymer by blending particles of the polymer with the thermal energy storage hydrate.Type: GrantFiled: April 6, 1987Date of Patent: April 26, 1988Assignee: Allied Colloids LimitedInventors: Malcolm Hawe, David Marshall, John R. Walker