2-Oxepanone, polymer with 1,4-butanediol and 1,1-methylenebis4-isocyanatobenzene;2-oxepanone, polymer with 1,4-butanediol and 1,1’-methylenebis[4-isocyanatobenz;MDI/ epsilon-caprolactone/ 1,4-butylene glycol copolymer
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