. . . . "In another preferred embodiment of the invention, a mixture of two or more copolymerizable monomers is used as component B. Suitable mixtures are, for example, mixtures of vinyl acetate, vinyl propionate, vinyl laurate or vinyl versatate with one or more of the other monomers mentioned above, more particularly with acrylic acid or methacrylic acid or the corresponding acrylic or methacrylic acid e" .