C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 297/00 (2006.01) C08F 220/54 (2006.01) C08F 220/56 (2006.01) C09K 3/22 (2006.01)
Patent
CA 2165505
A method for suppressing the dissemination of fugitive dust parti- cles into the atmosphere by using a cationic copolymer selected from the group consisting of (a) a graft copolymer of the general structure: Image wherein E is the repeat unit obtained after polymerization of an .alpha., .beta.ethylenically unsaturated compound, the molar percentage of a:b is from about 95:5 to 5:95, with the proviso that the sum of a and b equals 100%; G comprises the structure: Image wherein d is a cationic monomer, R1, R2 and R3 are the same or different and are hydrogen or a lower alkyl group having C1 to C3, F is a salt of an 26 ammonium cation and the molar percentage of c:d is from 95:5 to 5:95 with the proviso that the sum of c and d equals 100%; (b) a block co- polymer of the general structure: Image wherein J is a polymeric segment obtained from the polymerization of ethylenically unsaturated hydrophobic monomers initiated by a difunc- tional initiator; R4 and R5 are H or a C1 to C3 alkyl group; K is a salt of an ammonium cation selected from the group consisting of NHR6N+ (R7,8,9)M- or OR6N+ (R7,8,9)M- wherein R6 is a C1 to C4 linear or branched alkylene group and R7, R8 and R9 are selected from the group consisting of hydrogen, C1 to C4 linear or branched alkyl, C5 to C8 cyclo- alkyl, aromatic or alkylaromatic group; and M- is an anion, selected from the group consisting of chloride, bromide, methyl sulfate and hydrogen sulfate; and the molar percentage x:y is from about 0:100 to 95:5, with the proviso that the total of x + y equals 100%; and (c) linear copolymers of acrylamide and dimethylaminoethylacrylate methyl chloride.
Betzdearborn Inc.
Borden Ladner Gervais Llp
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