Patent ID: 8048846

Claim:
A protein-silane and/or protein-siloxane copolymer obtainable by reacting a protein having at least one reactive amino group and a silane compound, the relative amounts of the protein and the silane compound being such that in the range of from 0.1 to 0.4 moles of silane are present per mole of reactive amino group of the protein, and that the copolymer having the general formula (I): wherein R is the residue of a hydrolysed protein R—NH 2 ; each R 1 and R 1′ is independently the residue of the silane compound wherein the silane compound is an organofunctional silane; R 2 and R 3 are each independently methyl, hydroxy, alkoxy having 1 to 6 carbon atoms or a residue of a compound of formula (IA): wherein R, R 1 , R 1′ , R 2 and R 3 are each independently as defined; and n corresponds to the number of reacted amino groups, and the copolymer has a weight average molecular weight of from 295 D to 3 kD.