A number of polyester modified rosin with foam formulations have been utilized to prepare rigid urethane foams.

若干聚酯改性松香及其泡沫配方已用于制备硬质尿烷泡沫。

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Lastly, of course, the main reaction of interest is the formation of urethane groups by reaction of isocyanate groups and hydroxy - groups of the polyester or polyether.

最后，当然，利息的主要反应是异氰酸酯基和羟基的聚酯或聚醚组反应形成聚氨酯组。

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Lastly, of course, the main reaction of interest is the formation of urethane groups by reaction of isocyanate groups and hydroxy - groups of the polyester or polyether.

最后，当然，利息的主要反应是异氰酸酯基和羟基的聚酯或聚醚组反应形成聚氨酯组。

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