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US 7,001,972 B1Granted
Polyamines comprising urea groups, method for their production, and their use as hardeners for epoxide resins
AssigneeBayer Aktiengesellschaft
InventorsJörg Tillack, Lutz Schmalstieg, Wolfgang Puetz, Gerhard Ruttmann
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Abstract
The present invention provides polyamines which contain urea groups, a process for the preparation thereof and their use to produce adhesives, sealants, embedding compounds, moulded items or coatings.
Claims15
An urea group-containing, amine hardener mixture for epoxide resins, which is the reaction product of
- A) a polyisocyanate component comprising at least one organic polyisocyanate in which at least 95 mol. % of the NCO groups are reversibly blocked by reaction with at least one phenolic OH group-containing hydrocarbon resin having a hydroxyl group content (calculated as OH, molecular weight 17) of 0.1% to 10.0%, with
- B) at least one organic polyamine in an equivalent ratio of amine groups to blocked NCO groups of 2:1 to 50:1.
A process for preparing an urea group-containing amine hardener mixture which comprises reacting at a temperature of up to 200° C.
- A) a polyisocyanate component comprising at least one organic polyisocyanate in which at least 95 mol. % of the NCO groups are reversibly blocked by reaction with at least one phenolic OH group-containing hydrocarbon resin having a hydroxyl group content (calculated as OH, molecular weight 17) of 0.1% to 10.0%, with
- B) at least one organic polyamine in an equivalent ratio of amine groups to blocked NCO groups of 2:1 to 50:1.
An urea group-containing, amine hardener mixture for epoxide resins, which is the reaction product of a mixture consisting essentially of
- A) a polyisocyanate component comprising at least one organic polyisocyanate in which at least 95 mol. % of the NCO groups are reversibly blocked by reaction with at least one phenolic OH group-containing hydrocarbon resin having a hydroxyl group content (calculated as OH, molecular weight 17) of 0.1% to 10.0%, with
- B) at least one organic polyamine in an equivalent ratio of amine groups to blocked NCO groups of 5:1 to 15:1.
Dependencies are inferred from the claim text.