Polyamine having a reduced blushing effect, and use thereof as a curing agent for epoxy resins

Polyamine A1 of formula (I) or (II)

• wherein
• a stands for an integer from 2 to 100;
• A stands for an a-valent radical of a polyamine B1 after removal of a primary amino groups, wherein the a-valent radical has at least 3 amino groups that are secondary or primary amino groups and a number of the secondary amino groups is greater than a number of the primary amino groups;
• either
• R1 and R3 each independently stands for an alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C atoms, the alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C atoms optionally having ether groups or halogen atoms, and
• R2 stands for a hydrogen atom or for an alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C atoms;
• or
• R2 and R1 together stands for a divalent hydrocarbon radical that is part of a carbocyclic ring with 5 to 8 C atoms, or R2 and R1 together stands for a divalent hydrocarbon radical that is part of a substituted carbocyclic ring with 5 to 8 C atoms, and
• R3 stands for an alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C atoms, the alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C atoms optionally having ether groups or halogen atoms;
• or
• R2 and R3 together stands for a divalent hydrocarbon radical that is part of a carbocyclic ring with 5 to 8 C atoms, or R2 and R3 together stands for a divalent hydrocarbon radical that is part of a substituted carbocyclic ring with 5 to 8 C atoms, and
• R1 stands for an alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C atoms, the alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C optionally having ether groups or halogen atoms;
• and
• R4 and R5 each independently stands for an alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C atoms, the alkyl, cycloalkyl, aryl, or arylalkyl group with 1 to 12 C optionally having ether groups or halogen atoms.