201  US 9,958,775 B2  202  -continued  P6  OH  -=:::::  P7  -continued  MW~ 10000, Mw/Mn  ~  1.60  -15100, Mw/Mn  ~  l.40  OH  MW- oyo\)  P9  ~~  ¢  0  O  OH  9o6  ---t  MW~ 8000, Mw/Mn  ~  1.3 5  0  0  ,::P"  +  I  ~  ~  #  0  0  [Cross-Linking Agent  (C)]  As a cross-linking agent  C  the following formul  ( ),  compounds represented  b  ae were used.  Y  [Chem. 109]  CL-1  OH  -0  OH  -0  OH  PS  MW~ 7500, Mw/Mn  ~  1.50 