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EP0172724A2
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Polymerisation processes and polymeric compositions
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1985-08-14
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Granted: —
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Expires: 2005-08-14
Abstract
Abstract Polymers that are soluble or swellable in water or an alkali and that include pendant hydrophobic groups can be in the form of particles having a dry size of below 4 microns and can be made by reverse phase polymerisation in the presence of a water soluble initiator, and generally an amphipathic suspension stabiliser, of a blend of all the monomers as a solution in water. Particularly preferred products are cross linked polymers formed from a monomer containing pendant hydrophobic groups and acrylic acid, as free acid or salt, and/or acrylamide.
Inventors
- 👤 Adrian Allen
- 👤 David Farrar
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:16
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08F; C08F2/00; C08F2/32; C08J3/09; C08J2300/00; C08J2300/10; C08J2300/14
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
61 words
A polymer made by copolymerisation of (a) ethylenically unsaturated monomer containing a pendant hydrophobic group of at least 8 carbon atoms and (b) water soluble ethylenically unsaturated monomer characterised in that all the monomers are, as a blend, soluble in water, the polymer has been made by reverse phase polymerisation and the particles have a dry size of below 4 µm.
Claim 2
Dependent Claim
61 words
A polymer made by copolymerisation of (a) ethylenically unsaturated monomer containing a pendant hydrophobic group of at least 8 carbon atoms and (b) water soluble ethylenically unsaturated monomer characterised in that all the monomers are, as a blend, soluble in water, the polymer has been made by reverse phase polymerisation and the particles have a dry size of below 4 µm.
Claim 3
Dependent Claim
72 words
A polymer in the form of particles having a dry size of below 4 µm and that has been made by reverse phase polymerisation of an aqueous solution of a blend of monomers characterised in that the monomers comprise (a) ethylenically unsaturated monomer containing a pendant hydrophobic group of at least 8 carbon atoms and (b) water soluble ethylenically unsaturated comonomer and all the monomers are, as a blend, soluble in water.
Claim 4
Dependent Claim
72 words
A polymer in the form of particles having a dry size of below 4 µm and that has been made by reverse phase polymerisation of an aqueous solution of a blend of monomers characterised in that the monomers comprise (a) ethylenically unsaturated monomer containing a pendant hydrophobic group of at least 8 carbon atoms and (b) water soluble ethylenically unsaturated comonomer and all the monomers are, as a blend, soluble in water.
Claim 5
Dependent Claim
63 words
A polymer according to claim 1 or claim 2 in which the monomers (b) are selected from ethylenically unsaturated carboxylic and sulphonic acids, in the form of water soluble free acids and water soluble salts, acrylamide, methacrylamide, dialkyl amino alkyl (meth) acrylate or (meth) acrylamide, in the form of water soluble acid addition or quaternary ammonium salts, and water soluble cross linking agents.
Claim 6
Dependent Claim
28 words
A polymer according to claim 1 or claim 2 in which the monomers (b) are selected from acrylic acid as free acid or water soluble salt and acrylamide.
Claim 7
Dependent Claim
26 words
A polymer according to claim 4 including cross linking agent in an amount such that the resultant particles will swell but not dissolve in aqueous media.
Claim 8
Dependent Claim
36 words
A polymer according to any preceding claim in which the monomer (a) is the ester or amide of an ethylenically unsaturated acid, or a (meth) allyl ether, with a hydroxy terminated surfactant having HLB above 8.
Claim 9
Dependent Claim
58 words
A polymer according to claim 6 in which the monomer (a) has the formula CH2=CR'CH20BnAmR where R' is H or Me, A is propoxy or butoxy, B is ethoxy, n is zero or an integer 2 to 100, m is zero or an integer less than n, R is a hydrophobic group of at least 8 carbon atoms.
Claim 10
Dependent Claim
40 words
A polymer according to any preceding claim in which the monomer (a) includes a polyethoxy chain between the ethylenically unsaturated carbon and the hydrophobic group, the chain being of sufficient length that the monomer is soluble in the aqueous phase.
Claim 11
Dependent Claim
88 words
A process of making a polymer by copolymerising (a) ethyllenically unsaturated monomer containing a pendant hydriphobic group of at least 8 carbon atoms and (b) water soluble ethylenically unsaturated comonomer characterised in that all the monomers are, as a blend, soluble in water, a dispersion in non-aqueous liquid is formed of an aqueous solution of a blend of all the monomers and the blend is copolymerised by reverse phase polymerisation in the presence of water soluble initiator to form a stable dispersion of aqueous polymer in non-aqueous liquid.
Claim 12
Dependent Claim
88 words
A process of making a polymer by copolymerising (a) ethyllenically unsaturated monomer containing a pendant hydriphobic group of at least 8 carbon atoms and (b) water soluble ethylenically unsaturated comonomer characterised in that all the monomers are, as a blend, soluble in water, a dispersion in non-aqueous liquid is formed of an aqueous solution of a blend of all the monomers and the blend is copolymerised by reverse phase polymerisation in the presence of water soluble initiator to form a stable dispersion of aqueous polymer in non-aqueous liquid.
Claim 13
Dependent Claim
37 words
A process according to claim 9 in which the reverse phase polymerisation is a reverse phase suspension polymerisation conducted in the presence of below 3% by weight, based on the non-aqueous phase, of a low HLB surfactant.
Claim 14
Dependent Claim
34 words
A process according to claim 9 or claim 10 in which the reverse phase polymerisation is conducted in the presence of a suspension stabiliser that is an amphipathic copolymer of hydrophilic and hydrophobic monomers.
Claim 15
Dependent Claim
39 words
A process according to any of claims 9 to 11 in which the monomer (a) is the ester or amide of an ethylenically unsaturated acid, or a (meth) allyl ether, with a hydroxy terminated surfactant having HLB above 8.
Claim 16
Dependent Claim
71 words
A process according to any of claims 9 to 12 in which the monomer (a) has the formula CH 2 =CR' CH 2 OB n A m R where R' is H or Me, A is propoxy or butoxy, B is ethoxy, n is zero or an integer 2 to 100, m is zero or an integer less than n, R is a hydrophobic group of at leist 8 carbon atoms.
Claim 17
Dependent Claim
43 words
A process according to any of claims 9 to 13 in which the monomer (a) includes a polyethoxy chain between the ethylenically unsaturated carbon and the hydrophobic group, the chain being of sufficient length that the monomer is soluble in the aqueous phase.
Claim 18
Dependent Claim
64 words
A process according to any of claims 9 to 14 in which the monomers (b) are selected from ethylenically unsaturated carboxylic and sulphonic acids, in the form of water soluble free acids and water soluble salts, acrylamide, methacrylamide, dialkyl amino alkyl (meth) acrylate or (meth) acrylamide, in the form of water soluble acid addition or quaternary ammonium salts, and water soluble cross linking agents.
Claim 19
Dependent Claim
25 words
A process according to claim 15 in which the monomers (b) are selected from acrylic acid as free acid or water soluble salt and acrylamide.
Claim 20
Dependent Claim
26 words
A process according to claim 16 including cross linking agent in an amount such that the resultant particles will swell but not dissolve in aqueous systems.
References Cited (Backward Citations)
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