Patent ID: 6238833
Filing Date: 2001-05-29
Classification: C08F

Abstract:
A method of preparing a binder comprising: selecting a polymer including a polyvinyl butyral moiety, a polyvinyl alcohol moiety, and an optional polyvinyl acetate moiety, wherein the polyvinyl alcohol moiety has a hydroxyl content of a first value, and decreasing the hydroxyl content to a lower second value that ranges from 0% by weight to less than the first value by reacting the polymer with a hydroxyl converting reactant to convert a portion of the repeating units of the polyvinyl alcohol moiety to a modified polyvinyl moiety of the formula ##STR7##where R is an organic substituent, thereby resulting in a polymeric compound including the polyvinyl butyral moiety, the polyvinyl alcohol moiety having the hydroxyl content of the lower second value, the optional polyvinyl acetate moiety, and the modified polyvinyl moiety.