Baybond 140 AQ Aliphatic polyester urethane Bayer MaterialScience Polyurethane (PU) - Polyols >> Polyester Baybond 140 AQ is an anionic dispersion of an aliphatic polyester urethane resin in water/toluene. Baybond 140 AQ polyurethane dispersion is suitable for use as a film-building component in glass fiber sizings. As with any product, use of Baybond 140 AQ in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability. Aliphatic polyester urethane resin.