EP0333499A1
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Polymerisation processes and products obtained from these
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1989-03-17
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Granted: —
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Expires: 2009-03-17
Abstract
Abstract Polymers are made by a novel form of precipitation polymerisation. The polymerisation is generally conducted in the presence of sufficient dispersion promoter for the precipitated polymer particles to be held as a stable dispersion in the reaction medium. The invention is of particular value for the production of associative polymers.
Inventors
- 👤 Adrian Swinburn Allen
- 👤 Peter Flesher
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 08:44
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/06; C08F2/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
166 words
A process of making a stable dispersion in a reaction medium of an associative polymer that is insoluble in that reaction medium but that is soluble or swellable in aqueous alkali, aqueous acid or water, and that is formed from a monomer or monomer blend that consists of 1 to 100% ethylenically unsaturated associative monomer and 0 to 99% by weight other ethylenically unsaturated monomer, characterised in that the monomer or monomer blend is soluble in the reaction medium and the process comprises dissolving it in the reaction medium and polymerising the monomer or monomer blend while dissolved in the reaction medium and thereby forming the polymer particles and the reaction medium is an organic liquid that is free of water or includes water in an amount less than 50% by weight monomer or monomer blend, and contains polymerisation initiator, and contains dispersion promoter selected from emulsifiers and stabilisers in an amount such that the polymer particles are held in stable dispersion in the reaction medium.
Claim 2
Dependent Claim
166 words
A process of making a stable dispersion in a reaction medium of an associative polymer that is insoluble in that reaction medium but that is soluble or swellable in aqueous alkali, aqueous acid or water, and that is formed from a monomer or monomer blend that consists of 1 to 100% ethylenically unsaturated associative monomer and 0 to 99% by weight other ethylenically unsaturated monomer, characterised in that the monomer or monomer blend is soluble in the reaction medium and the process comprises dissolving it in the reaction medium and polymerising the monomer or monomer blend while dissolved in the reaction medium and thereby forming the polymer particles and the reaction medium is an organic liquid that is free of water or includes water in an amount less than 50% by weight monomer or monomer blend, and contains polymerisation initiator, and contains dispersion promoter selected from emulsifiers and stabilisers in an amount such that the polymer particles are held in stable dispersion in the reaction medium.
Claim 3
Dependent Claim
71 words
A process according to claim 1 conducted by forming a solution of the monomer or monomer blend in non-aqueous liquid that is wholly miscible with the reaction medium and adding this solution batchwise or continuously to the reaction medium containing initiator and at a temperature such that polymerisation occurs during the addition and thereby forming polymer particles in the presence of the dispersion promoter which stabilises them as a stable dispersion.
Claim 4
Dependent Claim
23 words
A process according to claim 1 or claim 2 in which the initiator is an oil soluble initiator that is insoluble in water.
Claim 5
Dependent Claim
31 words
A process according to any preceding claim in which the monomer or monomer blend is soluble in the organic liquid of the reaction medium in the absence of the dispersion promoter.
Claim 6
Dependent Claim
26 words
A process according to any preceding claim in which the amount of dispersion promoter is from 3 to 20% by weight of monomer or monomer blend.
Claim 7
Dependent Claim
26 words
A process according to any preceding claim in which the amount of water in the reaction medium is from 4 to 50% by weight monomer blend.
Claim 8
Dependent Claim
21 words
A process according to claim 6 in which the monomer blend is more soluble in water than in the non-aqueous liquid.
Claim 9
Dependent Claim
40 words
A process according to any preceding claim in which the amount of polymer in the dispersion is from 35 to 60% by weight and the water content of the dispersion is from 4 to 12% by weight of the dispersion.
Claim 10
Dependent Claim
64 words
A process according to any preceding claim in which the associative monomer is an ethylenically unsaturated monomer carrying a pendant group of the formula -B n R where n is zero or a positive integer, B is ethoxy and R is a hydrocarbyl group of at least 8 carbon atoms and the said other ethylenically unsaturated monomer is selected from anionic and non-ionic monomers.
Claim 11
Dependent Claim
135 words
A process of making a stable dispersion in a reaction medium of water swellable polymer particles by polymerisation of water soluble ethylenically unsaturated monomer or monomer blend including cross linking agent in the reaction medium in the presence of dispersion promoter selected from emulsifiers and stabilisers, characterised in that the reaction medium is a substantially non-aqueous liquid which is a solvent for the monomer or monomer blend and is a non-solvent for the polymer particles, and the process comprises forming a solution of the monomer or monomer blend in the reaction medium in the presence of initiator and polymerising the monomer or monomer blend while dissolved in the reaction medium and thereby forming the polymeric particles, and the amount of dispersion promoter is such that the particles form a stable dispersion in the reaction medium.
Claim 12
Dependent Claim
135 words
A process of making a stable dispersion in a reaction medium of water swellable polymer particles by polymerisation of water soluble ethylenically unsaturated monomer or monomer blend including cross linking agent in the reaction medium in the presence of dispersion promoter selected from emulsifiers and stabilisers, characterised in that the reaction medium is a substantially non-aqueous liquid which is a solvent for the monomer or monomer blend and is a non-solvent for the polymer particles, and the process comprises forming a solution of the monomer or monomer blend in the reaction medium in the presence of initiator and polymerising the monomer or monomer blend while dissolved in the reaction medium and thereby forming the polymeric particles, and the amount of dispersion promoter is such that the particles form a stable dispersion in the reaction medium.
Claim 13
Dependent Claim
30 words
A process according to claim 10 in which the monomers are a blend of 10 to 100% (meth) acrylic acid and 0 to 90% acrylamide, together with cross linking agent.
Claim 14
Dependent Claim
110 words
A process in which water soluble or water swellable polymer particles are made by polymerisation of water soluble ethylenically unsaturated monomer or monomer blend in a substantially non-aqueous liquid reaction medium that is a solvent for the monomer or monomer blend and is a non-solvent for the polymer particles, characterised in that the process comprises forming a solution of the monomer or monomer blend in the reaction medium in the presence of initiator and water in an amount of 4 to 50% by weight monomer or monomer blend and polymerising the monomer or monomer blend while dissolved in the reaction medium and thereby forming the polymeric particles containing the water.
Claim 15
Dependent Claim
110 words
A process in which water soluble or water swellable polymer particles are made by polymerisation of water soluble ethylenically unsaturated monomer or monomer blend in a substantially non-aqueous liquid reaction medium that is a solvent for the monomer or monomer blend and is a non-solvent for the polymer particles, characterised in that the process comprises forming a solution of the monomer or monomer blend in the reaction medium in the presence of initiator and water in an amount of 4 to 50% by weight monomer or monomer blend and polymerising the monomer or monomer blend while dissolved in the reaction medium and thereby forming the polymeric particles containing the water.
References Cited (Backward Citations)
EP0135842A2
Cited
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