Polymeric compositions and their production and uses
AssigneeCiba Specialty Chemicals Water Treatments Ltd.
InventorsMark Sirfaraz Ghafoor, Malcolm Skinner, Ian Michael Johnson
Life of this patent
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Abstract
A stable, pourable, liquid composition contains 20 to 60% by weight of a blend of a water soluble high IV polymer and a water soluble low IV cationic coagulant polymer, is selected from polyamines, cationic dicyandiamide polymers and polymers of 70 to 100% ethylenically unsaturated cationic monomer with 0 to 30% by weight acrylamide, and contains 0.01 to 1 part by weight of a water soluble multi-hydroxy compound per part by weight of the coagulant polymer.
Claims16
A stable, pourable, liquid composition containing 20 to 60% by weight of a blend of a water soluble high IV polymer and a water soluble low IV cationic coagulant polymer, wherein the water soluble high IV polymer is a non-ionic or cationic polymer of water soluble ethylenically unsaturated cationic monomer or monomer blend and has an apparent IV of at least 2 dl/g as determined by measurements at 25.degree. C. using a suspended level viscometer on solutions in a 1 molar sodium chloride solution buffered to a pH of 7.5 and is present in the composition in an amount of 3 to 40% by weight, the water soluble low IV cationic coagulant has an IV of below 1.5 dl/g as determined by measurements at 25.degree. C. using a suspended level viscometer on solutions in a 1 molar sodium chloride solution buffered to a pH of 7.5 and is selected from polyamines, cationic dicyandiamide polymers and polymers of 70 to 100% ethylenically unsaturated cationic monomer selected from the group consisting of diallyl dimethyl ammonium chloride, dialkyl amino alkyl (meth) acrylates (including acid addition salts and quaternary ammonium salts) and dialkyl amino alkyl (meth) acylamides (including acid addition salts and quaternary ammonium salts) with 0 to 30% by weight acrylamide, and is present in the composition in an amount of 5 to 40% by weight, and the composition has a Brookfield viscosity of less than 30,000 cps as measured using spindle 6 at 10 rpm at 25.degree. C. and is a dispersion of the high IV polymer in an aqueous phase which is an aqueous solution of low IV coagulant polymer and 0.01 to 1 part by weight of a water soluble multi-hydroxy compound per part by weight of the coagulant polymer.
A composition according to any preceding claim in which the amount of the high IV polymer is 0.1 to 1 part per part by weight of the cationic coagulant.
A composition according to any preceding claim in which the amount of high IV polymer is 0.4 to 0.7 parts per part by weight of the cationic coagulant and is 5 to 20% by weight of the composition.
A composition according to any preceding claim in which the high IV polymer has apparent IV of 5 to 12 dl/g.
A composition according to any preceding claim in which the cationic monomer in the high IV polymer is a dialkylaminoalkyl (meth) -acrylate or -acrylamide as acid addition or quaternary salt.
A composition according to any preceding claim in which the cationic coagulant is selected from polyamines, cationic dicyandiamide polymers and polymers of 80 to 100% by weight DADMAC with 0 to 20% acrylamide.
A composition according to any preceding claim in which the aqueous solution also contains water soluble inorganic salt.
A composition according to claim 10 in which the amount of inorganic salt is 0.5 to 15% by weight of the composition and is 0.01 to 2 parts per part by weight of the coagulant.
A composition according to any preceding claim in which the high IV polymer is a polymer of 0 to 100% acrylamide and 100 to 0% by weight of an ethylenically unsaturated cationic monomer and optionally ethylenically unsatruated anionic monojmer in an amount less than the amount of cationic monomer.
A composition according to any preceding claim in which the high IV polymer is a polymer of 50 to 100% acrylamide and 0 to 50% of the cationic monomer and is present in an amount of 3 to 30% by weight of the composition, and the amount of the coagulant is 5 to 40%.
A composition according to any preceding claim in which the composition is free of polymers containing hydrophobic groups which include alkyl containing 4 or more carbon atoms or aryl.
A process of making a composition according to any preceding claim comprising dissolving in the said aqueous phase the monomer or monomers which are to be polymerised to form the high IV polymer and then polymerising the monomers.
Dependencies are inferred from the claim text.