Patent ID: 6765083
Filing Date: 2004-07-20
Classification: C08G,C08J,G02B,Y10S,Y10T

Abstract:
A method of extracting cured polymers comprising hydrophobic and hydrophilic monomers, where the method comprises the steps of treating the cured polymer with an extracting solvent of Formula IR1â€”Oâ€”[CH2â€”CH(R3)â€”O]nâ€”R2â€ƒâ€ƒI wherein R1 is hydrogen, C1-6alkyl, C1-6alkylcarbonyl, aminocarbonyl, â€”SO3H, phenyl, or substituted phenyl where the phenyl substituents are C1-6alkyl, C1-6alkoxyl, amino, nitro, or halogen; R2 is hydrogen, C1-6alkyl, C1-6alkylcarbonyl, aminocarbonyl, â€”SO3H, phenyl, or substituted phenyl where the phenyl substituents are C1-6alkyl, C1-6alkoxyl, amino, nitro, or halogen; R3 is C1-6alkyl phenyl C1-6alkylcarbonyl, aminocarbonyl, â€”SO3H, phenyl, or substituted phenyl where the phenyl substituents are C1-6alkyl, C1-6alkoxyl, amino, nitro, or halogen; n is 1-10; wherein said extracting solvent when measured at 25Â° C. (a) swells the cured polymer from about 0% to about 50%, and (b) has Hansen Solubility Parameters within the ranges of &dgr;H=about [&dgr;Hcured polymer+2.5] to about [&dgr;Hcured polymerâˆ’8.5]&dgr;P=about [&dgr;Pcured polymer+0.5] to about [&dgr;Pcured polymerâˆ’4.0] and &dgr;D=about [&dgr;Dcured polymer+2.5] to about [&dgr;Dcured polymerâˆ’2.0].