212  US 8,574,814 B2  211  The following compounds were used for comparison. All  of the compositional ratios, weight average molecular  weights, and dispersities are shown below.  OH  (R-2)  xv  x/y/z  ~  7 6/19/5  Mw  ~  4700, PD!~ 1.17  0  ~I  ~  OH  (R-3)  xv  x/y/w  ~  75/22/3  Mw  ~  4500, PD!~ 1.17  (R-1)  OH  xv  x/y  ~  74/26  Mw  ~  4600, PD!~ 1.17  (P-26)  RO  OR  OR  OR  )  0~  1Q  (27%)  -continued  -continued  [Chem. 90]  (Compounds for Comparison) 