Method for producing aqueous solution of polymer having phosphorylcholine groups
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United States of America Patent
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Mar 20, 2001
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N/A
app pub date -
Dec 2, 1996
filing date -
Apr 3, 1995
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Abstract
A method for producing an aqueous solution of a polymer having a phosphorylcholine group in which a polymerizable composition containing a polymerizable monomer having the phosphorylcholine group represented by the formula (1) is polymerized in the presence of a non-metal polymerization initiator soluble in a water-containing medium, to obtain a crude polymer aqueous solution, and the crude polymer aqueous solution is purified with a separation membrane, and an aqueous solution of the polymer having the phosphorylcholine group obtained by the method and having not more than 2000 ppm of impurities. ##STR1## (X: a divalent organic residue, Y: an alkyleneoxy group having C1 to 6, Z: H, R.sup.5 --O--CO--(R.sup.5 : an alkyl group of C1 to 10), R.sup.1 :H, CH.sub.3, R.sup.2, R.sup.3, R.sup.4 : H, a hydrocarbon group or a hydroxy substituted hydrocarbon group of C1 to 6, m; 0 or 1)
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