| http://www.w3.org/ns/prov#value | - The binder can be a polar material, such as an acidic polymer containing at least 1.5 mole percent free acid groups to impart polarity to the polymer, or a nonpolar material such as the materials described in Burg, U.S. Pat. No. 3,060,023; Chu, U.S. Pat. No. 3,649,268; and Collier, U.S. Pat. No. 3,984,244.
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