Patent ID: 7384504

Claim:
A method for the production of light-stable and process-stable lignocellulosic material from a first lignocellulosic material, comprising the reaction of the first lignocellulosic material in an aqueous medium, in an alkaline peroxide bleaching medium, or in an aqueous medium with a subsequent bleaching of reacted material in an alkaline peroxide bleaching medium, with a water-soluble, yellowing inhibitor or hindered amine light stabilizer of the general formula (O): wherein s is 1, resulting in a 6-membered piperidine ring; k is an integer of 1 to 5, n is an integer of 5; m is an integer of 1; t is an integer of 3; p is an integer of 5; X is an inorganic or organic anion; Y is hydroxyl (OH); Y 1 is hydrogen; Y 2 is hydrogen; R 2 , R 3 , R 4 and R 5 are independently methyl groups; R 1 is hydrogen; R 6 is hydrogen; and R is a radical (functional group) of the formula (M); wherein X is the same as defined above; k is as defined above, R 10 , R 11 , R 12 and R 13 are independently methyl groups; y is 1, and z is 1.