发明授权
US06143132A Process for imparting wet strength to paper 失效
赋予纸张湿强度的方法

Process for imparting wet strength to paper
摘要:
The novel AOX-free process for imparting wet strength to paper with water-dispersible polyisocyanates is distinguished by a good wet-strength effect, even under mild drying conditions, and does not affect the activity of optical brighteners used at the same time.
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