| abstract |
The present invention relates to a process for the preparation of a composition comprising at least one polyurethane with NCO endings, and at least one catalyst B chosen from tertiary amines, said process comprising the following steps:n a) preparation of a polyurethane with NCO endings, comprising a step of polyaddition of a polyol composition (s) and of a polyisocyanate composition (s), in the presence of at least one catalyst A chosen from the group consisting :n ○ organo-metallic catalysts with the exception of tin-based catalysts,n ○ tertiary amines; andn ○ of their mixtures,n organometallic catalysts with the exception of tin-based catalysts, tertiary amines and their mixtures, andn b) adding at least one catalyst B chosen from tertiary amines to the polyurethane with NCO endings obtained at the end of step a). |