Patent ID: 8759471

Claim:
A mixture of a urethane-aldehyde resin UA prepared by condensation of an aldehyde A1 and an alkyl urethane U, and of a novolak PA prepared by reaction of an aldehyde A2 with a phenolic compound P wherein the aldehydes A1 and A2 are independently selected from the group consisiting of formaldehyde, acetaldehyde, propionic aldehyde, butyric aldehyde, and isobutyric aldehyde, the alkyl urethane U is selected from the group consisting of ethyl urethane, butyl urethane, 2-ethylhexyl urethane, and decyl urethane, the phenolic compound P is selected from the group consisting of phenol, o-, m-, and p-cresol, o-, m-, and p-monoalkylphenols with alkyl radicals up to 18 carbon atoms, and the mass ratio of the urethane aldehyde resin UA and the novolak PA is from 90 g:10 g to 10 g:90 g.