| http://www.w3.org/ns/prov#value | - The mixture of claim 21 wherein the reinforcement promoter has the structure: ##STR24## wherein R1 is an organic group free of olefinic or acetylenic unsaturation having a valence of n; R2, and R3, and R4 are hydrogen, carboxy, or monovalent organic groups free of olefinic or acetyleneic unstaursation; X is: ##STR25## m has a value of 0 or 1; and n has a value of at least two. 24.
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