发明名称 |
Method for preventing the discoloration of paper and paper treated to prevent discoloring |
摘要 |
A process for treating paper to prevent discoloration when exposed to light which comprises adding 1% to 10% by weight of hypophosphorous acid or its salt based on the paper at any stage during or after paper making and maintaining said hypophosphorous acid or its salt therein. The invention also provides paper which contains hypophosphorous acid or its salt to prevent discoloration when exposed to light.
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申请公布号 |
US5181988(A) |
申请公布日期 |
1993.01.26 |
申请号 |
US19910715042 |
申请日期 |
1991.06.12 |
申请人 |
ASAHI DENKA KOGYO KABUSHIKI KAISHA |
发明人 |
AKUTSU, MITSUO;IWAKURA, SYUJI |
分类号 |
D21H17/10;D21H21/14 |
主分类号 |
D21H17/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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