oxybutylene group these oxyalkylene groups may be in the form of random copolymers or block copolymers according to the method of the invention the fatty acid polyoxyalkylene ester is used in the stage of disintegrating waste paper in water with an alkali such as sodium hydroxide usually in an amount of 0 2 1 0 by weight based on the waste paper although not limited to the exemplified the method of the invention has an important feature in that the deinking agent can be used as a one component agent however the agent may be used in conjunction with any known deinking agent such as anionic surfactants or nonionic surfactants for example a higher alcohol a higher alcohol sulfate salt a sulfate salt of ethylene oxide adducts to higher alcohols or alkylphenols as above set forth the method of the invention uses such a specific fatty acid polyoxyalkylene ester as a deinking agent in the floatation method for waste paper reclamation and thus the method provides deinked pulp having a high degree of whiteness and low residual ink droplet number in addition the deinking agent used is a one component liquid agent so that it can be used easily and reduces the energy required in the floatation method in the deinking process the invention will be described in more detail with reference to examples however the invention is not limited to the examples eighty percent by weight of waste newspapers offset relief ratio 6 4 and 20 by weight of waste leaflets were cut into pieces and placed in a bench disintegrator jis p 8209 to which were then added 1 5 by weight of sodium hydroxide 3 5 by weight of no 3 sodium silicate 1 0 by weight of a 30 aqueous solution of.