The present invention is method for controlling the stereoisomerism of PVB
resin as well as a PVB resin having a meso/racemic stereoisomer ratio of
from about 2.5 to about 5.0. Manipulation of the PVB stereoisomer ratio
can provide an additional method of controlling the physical properties
of PVB, in addition to or in lieu of changing additives or manipulating
the PVB composition.