Patent ID: 6368631
Filing Date: 2002-04-09
Classification: A61K

Abstract:
A pharmaceutical composition, comprising:a drug; and a graft copolymer (A) consisting essentially of structural units of the following formulae (1) and (2): whereinQ1 is a hydrogen atom, a methyl group, or a cyano group, and Q2 is a hydrogen atom, whereinR1 is a hydrogen atom or a halogenomethyl group, R2 is a C1-C10 alkyl group, R3 is a hydrogen atom or a C1-C10 alkyl group, and R4 is a C1-C10 alkyl group, provided that the total carbon number of R3 and R4 taken together is between 3 and 20 inclusive; whereinQ3 is a hydrogen atom or a methyl group, Q4 is a group having the following structure: wherein A1 is a C1-C10 alkylene group, Q5 is an oxygen atom, Q6 is a C1-C10 alkylene group, Q7 is an oxygen atom or a sulfur atom, X1 is two hydrogen atoms, each of R5, R7, and R8 is a hydrogen atom or a methyl group, R6 is a C1-C10 alkyl group, l is a number from 1 to 100, and each of m and n is a number from 0 to 100; wherein the mole fraction of the structural unit of formula (2) in graft copolymer (A) is between 0.001 and 1.