发明授权
US5326391A Microporous material exhibiting increased whiteness retention 失效
表现出增加的白度保留的微孔材料

Microporous material exhibiting increased whiteness retention
摘要:
The tendency of microporous material to discolor over a period of time when exposed to the atmosphere during normal usage can be reduced if the microporous material comprises whiteness retaining organic surface active agent.
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