Patent ID: 8741426

Claim:
A blend comprising α) one or more epoxy resins and β) a mixture comprising a) a hardener component comprising at least two hardener components a1) and a2) provided in a weight ratio of a1) to a2) ranging from 1.5 to 10:1; and b) tetramethylguanidine provided in an amount of 5% to 55% by weight, based on the weight of the mixture β); wherein hardener component a1) is a polyetheramine selected from the group consisting of: difunctional, primary polyetheramine based on polypropylene glycol, with an average molar mass of 230; difunctional, primary polyetheramine based on polypropylene glycol, with an average molar mass of 400; trifunctional, primary polyetheramine prepared by reacting propylene oxide with trimethylolpropane, followed by amination of the terminal OH groups, with an average molar mass of 403; and trifunctional, primary polyetheramine prepared by reacting propylene oxide with glycerol, followed by amination of the terminal OH groups, with an average molar mass of 5000; wherein hardener component a2) is selected from the group consisting of: isophoronediamine, aminoethylpiperazine, 1,3-bis(aminomethyl)cyclohexane, and triethylenetetraamine; and wherein the mixture β) is present in an amount of 10 to 60 mol % less than the amount needed for reaction of the active epoxy groups of the one or more epoxy resins α) and the amine functions of the mixture β), and such that hardener component a) is present in an amount of 0.3 to 0.9 amine equivalent per epoxide equivalent of the one or more epoxy resins α).