Hydrazone compounds having two organic moieties joined by a hydrazone group, such as phenylacetone t-butyl hydrazone, are useful blowing agents for foaming polymers, such as bisphenol A/phosgene polycarbonate at temperatures above about 280.degree. C., and particularly at about 300.degree. C. to about 310.degree. C. Polycarbonate polymers formed using the hydrazones as foaming agents show a high impact strength.
含有两个有机基团通过
肼酮基团连接的
肼酮化合物,例如
苯乙酮叔丁基
肼酮,在温度高于约280°C,特别是在约300°C至310°C左右时,对于发泡聚合物(例如
双酚A/
光气聚
碳酸酯)是有用的发泡剂。使用
肼酮作为发泡剂形成的聚
碳酸酯聚合物表现出高的冲击强度。