| prov:value
| - astomers, while concurrently possessing desirable qualities characteristic of urethane elastomers, the latter qualities being, among others, improvement in abrasion resistance, and oil resistance, owing to the presence of urethane, urea, biuret, allophonate and other linkages which are formed via isocyanate reactions with the hydroxyl groups, amine groups or other functional groups which are utili
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