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US 4,381,367 AGranted
Sizing agents for paper and a process for the production thereof
AssigneeBayer Aktiengesellschaft
InventorsWulf von Bonin, Peter Mummenhoff, Heinz Baumgen
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AssigneeBayer Aktiengesellschaft
InventorsWulf von Bonin, Peter Mummenhoff, Heinz Baumgen
Estimating the term…
Paper sizing agents in the form of an aqueous preparation of maleic acid anhydride copolymers of which the anhydride groups had been reacted either with organic or inorganic bases or with primary-tertiary diamines and the reaction products subsequently reacted with epichlorohydrin or with inorganic or organic acids to form salts, the copolymers being made up of polymerised units of (a) from 5 to 75%, by weight, of an aromatic vinyl compound; (b) from 10 to 75%, by weight, of acrylic and/or methacrylic acid C.sub.1 -C.sub.18 alkyl esters; (c) from 5 to 35%, by weight, of maleic acid anhydride; (d) from 0 to 25%, by weight, of other vinyl monomers; and (e) from 0.1 to 10%, by weight, based on the sum of monomers (a) to (d) (which amounts to 100%, by weight), of an unsaturated aldehyde or of an enol ether derived therefrom. The copolymers are produced by radical polymerisation preferably in the absence of solvents.
A paper sizing agent in the form of an aqueous preparation of a maleic acid anhydride copolymer whose anhydride groups have been reacted with from 0.2 to 10 times the molar quantity of ammonia or a primary-tertiary diamine whose primary and tertiary amino groups are separated by a linear or branched chain having 2 to 6 carbon atoms and the resultant reaction product is subsequently reacted with epichlorohydrin or acetic acid, said copolymers containing polymerized units of
Dependencies are inferred from the claim text.