Patent ID: 7919565
Filing Date: 2011-04-05
Classification: A61F,B01D,C08F,H01M,Y02E,Y10T

Abstract:
1. A composition comprising a sulfonated block copolymer which is solid in water having at least two polymer end blocks A, at least one polymer interior block B, and at least one polymer block D, wherein: a. each A block and each D block is a polymer block resistant to sulfonation and each B block is a polymer block susceptible to sulfonation, said A and B blocks containing no significant levels of olefinic unsaturation; b. each A block independently having a number average molecular weight between 1,000 and 60,000 and each B block independently having a number average molecular weight between 10,000 and 300,000; c. each A block is a segment of one or more polymerized para-substituted styrene monomers; d. each B block comprising segments of one or more vinyl aromatic monomers selected from polymerized (i) unsubstituted styrene monomers, (ii) ortho-substituted styrene monomers, (iii) meta-substituted styrene monomers, (iv) alpha-methylstyrene, (v) 1,1-diphenylethylene, (vi) 1,2-diphenylethylene and (vii) mixtures thereof; e. said B blocks are sulfonated to the extent of 10 to 100 mol percent, based on the units of vinyl aromatic monomer in said B blocks; f. the mol percent of vinyl aromatic monomers which are unsubstituted styrene monomers, ortho-substituted styrene monomers, meta-substituted styrene monomers, alpha-methylstyrene, 1,1-diphenylethylene and 1,2-diphenylethylene in each B block being between 10 mol percent and 100 mol percent; g. said sulfonated block copolymer is non-dispersible and solid in water, and has a tensile strength greater than 100 psi in the presence of water according to ASTM D412 after immersion in water for 24 hours; and h. each D block having a glass transition temperature of less than 20° C. and a number average molecular weight of between 1,000 and 50,000.