发明授权
US06765046B1 Process for producing polymethylmethacrylate molding materials with a neutral color
失效
具有中性色聚甲基丙烯酸甲酯成型材料的方法
- 专利标题： Process for producing polymethylmethacrylate molding materials with a neutral color
- 专利标题（中）： 具有中性色聚甲基丙烯酸甲酯成型材料的方法
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申请号： US09341669申请日： 1999-09-03
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公开(公告)号： US06765046B1公开(公告)日： 2004-07-20
- 发明人: Uwe Numrich , Michael Wicker , Klaus Albrecht , Heinz Vetter , Hermann Jaksch , Ernst Mohr
- 申请人： Uwe Numrich , Michael Wicker , Klaus Albrecht , Heinz Vetter , Hermann Jaksch , Ernst Mohr
- 优先权： DE19701441 19970117
- 主分类号： C08K332
- IPC分类号： C08K332
摘要：
Products based on polymethylmethacrylate (PMMA) so resistant to yellowing and so highly transparent that even the edges of plates produced from this material have a neutral colour, i.e. do not display any yellow tone. This effect is obtained by the admixture of 5 to 50 ppm inorganic, reducing phosphorus compounds after polymerisation. This enables the brightener content to be reduced under 10 ppb, and so the end product may also be used in contact with foodstuffs.
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