Patent ID: 6642333
Filing Date: 2003-11-04
Classification: C08F

Abstract:
A vinylpyrrolidone (co)polymer, which has a Hazen value of not more than 30 in the form of 5% aqueous solution and a K value of not more than 60, with the vinylpyrrolidone (co)polymer being obtained by a process including the step of polymerizing a polymerizable monomer component with an azo compound initiator and/or an organic peroxide initiator, wherein the polymerizable monomer component includes N-vinylpyrrolidone, and wherein the azo compound initiator has a chemical structure as shown by â€”C(CH3)2â€”N&boxH;Nâ€”C(CH3)2â€”, and wherein the organic peroxide initiator is soluble in water or ethyl alcohol of 25Â° C. in an amount of not smaller than 3 weight %.