发明授权
- 专利标题： Positive-acting thermographic materials
- 专利标题（中）： 正效热成像材料
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申请号： US280569申请日： 1988-12-06
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公开(公告)号： US4910186A公开(公告)日： 1990-03-20
- 发明人: David R. Whitcomb
- 申请人： David R. Whitcomb
- 申请人地址： MN St. Paul
- 专利权人： Minnesota Mining and Manufacturing Company
- 当前专利权人： Minnesota Mining and Manufacturing Company
- 当前专利权人地址： MN St. Paul
- 主分类号： B41M5/32
- IPC分类号： B41M5/32
摘要：
A positive-acting thermographic material which is black or dark colored in the unexposed condition turns white or light colored when exposed to elevated temperatures. The material comprises a binder, a dark colored complex of ferric iron with a ligand chosen from organothiophosphorus acids, and a white organophosphorus acid or its alkali or alkaline earth metal salt. At elevated temperatures a double decomposition reaction occurs giving the light colored complex of ferric iron with the organophosphorus acid.
公开/授权文献
- US4341694A Intumescent flame retardant compositions 公开/授权日：1982-07-27
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