Patent ID: 6172180
Filing Date: 2001-01-09
Classification: C08G,C08L

Abstract:
A block copolymer comprising1 to 50 first polymer segments, each first polymer segment having an average mole fraction of monomers possessing a branch point of 0.0001 to 1 and an average molecular weight range of 5 to 2,000 kDa; and1 to 50 second polymer segments, each second polymer segment having an average mole fraction of monomers possessing a branch point of 0 to 0.5 and an average molecular weight range of 5 to 2,000 kDa, wherein the first polymer segments are 5 to 95% by weight of the block copolymer, the second polymer segments are 5 to 95% by weight of the block copolymer, the ratio of the average mole fraction of monomers possessing a branch point of the second polymer segments to that of the first polymer segments is 0 to 0.5, and the first polymer segments are more hydrophilic than the second polymer segments;wherein the first polymer segment is poly(ethylene oxide), poly(propylene oxide), ethylene oxide/propylene oxide copolymer, poly(acrylic acid), poly(methacrylic acid), poly(acryl amide), poly(vinyl alcohol), poly(vinyl sulfonic acid), poly(styrene sulfonate), poly(vinyl phosphoric acid), poly(ethylene imine), poly(amino acid), or a mixture thereof.