C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5056, 400/92
C08L 73/02 (2006.01) C08F 8/30 (2006.01) C08F 8/44 (2006.01) C08K 5/35 (2006.01) C09D 173/02 (2006.01) C09J 173/02 (2006.01)
Patent
CA 2004513
AQUEOUS SOLUTIONS OR DISPERSIONS OF SELF-CROSSLINKING BINDERS, A PROCESS FOR THEIR PRODUCTION AND THEIR USE ABSTRACT OF THE DISCLOSURE Aqueous solutions or dispersions of self-crosslinking binders based on ionically modified polycarboxylic acid polyanhydrides, wherein the binders dissolved or dispersed in water have a) a total content of lateral carboxylic acid ester, carboxylic acid thioester or carboxylic acid amide groups of up to 500 milliequivalents per 100 grams solids, b) a content of chemically incorporated carboxylate groups of from 10 to 500 milliequivalents per 100 grams solids and c) a content of ammonium groups of from 10 to 500 milliequivalents per 100 grams solids, are prepared by a process which comprises a first reaction step wherein polyanhydrides A) containing intramolecular carboxylic anhydride groups are at least partly reacted, with or without inert solvents, with blocked amines B) which are activatible by water and which, in addition to blocked amino groups, contain at least one anhydride-reactive hydroxy, mercapto or amino group, in a molar ratio of anhydride groups to anhydride- reactive groups of 10:1 to 0.8:1 in an ester-, thioester- or amide- forming reaction accompanied by ring opening, and LeA 26 525 a second reaction step wherein the reaction mixture obtained from the first step is diluted with water and stirred at room temperature or higher until a stable aqueous solution or dispersion is formed. LeA 26 525
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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