C - Chemistry – Metallurgy – 08 – C
Patent
C - Chemistry, Metallurgy
08
C
402/5
C08C 1/065 (2006.01) B01J 19/24 (2006.01) B01J 19/26 (2006.01) C08F 6/18 (2006.01)
Patent
CA 1314651
ABSTRACT OF THE DISCLOSURE A process for agglomerating a polymer latex according to which process a polymer latex having a large particle size and a uniform particle size distribution can be produced without forming any coagulum, with a large effect of enlarging the particle size and in a short time is provided, which process is directed to a process for agglomerating polymer latex particles by adding an acid to a polymer latex of a small particle size (A) obtained by emulsion polymerization using an emulsifying agent which is reduced in the surface activity in an acetic state, and characterized by carrying out at least one of the following operations (i) to (iv): (i) an operation of continuously feeding the latex (A) and an acid into a flow type tubular apparatus; (ii) an operation of adding to the latex (A), an emulsifying agent of a good surface activity in an acidic state in advance, followed by continuously feeding the resulting latex and an acid into a flow type tubular apparatus; (iii) an operation of adding to the latex (A), a polymer- agglomerating agent having both a polar group and a non-polar group in one molecule in 0.0001 to 0.5 part based on 100 parts of solids of the polymer latex in advance, followed by adding an acid so as to lower the pH of the resulting latex down to 6 or less; and (iv) an operation of adding to the latex (A), an emulsifying agent of a good surface activity in an acidic state in advance; then adding an acid in excess to the resulting latex to prepare a latex having a lower concentration than that of the latex (A); thereafter mixing the resulting latex with the latex (A); and keeping the mixed latex at a pH of 6 or less.
550926
Goto Hideo
Igarashi Yutaka
Marks & Clerk
Umg Abs Ltd.
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