| 摘要 |
Cationic crosslinkable polyamidoamine resins which are obtainable by reaction of (A) a water-soluble polyamidoamine prepared from (1) aliphatic or aromatic dicarboxylic acids or functional derivatives thereof, such as anhydrides, esters or half-esters, and omega -aminocarboxylic acids containing at least 3 C atoms or lactams thereof, and (2) a polyamine mixture of ( alpha ) polyamines which contain at least two amino groups which are capable of amide formation and at least one further secondary or tertiary amino group, and ( beta ) polyamines which contain only two amino groups which are capable of amide formation, (B) with an epihalogenohydrin, in a molar ratio of 0.7 to 3.5 mol of epihalogenohydrin per mol of basic nitrogen in component (A), (C) with an inorganic base and (D) with 0.2 to 9.0 mol of a halogen-free mineral or carboxylic acid, the acid being added in at least an amount to give a pH of at least 5, are used as agents for imparting wet strength to paper.
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