发明授权
- 专利标题: D,L Tartaric acid as retardant for gypsum plaster
- 专利标题(中): D,L酒石酸作为石膏膏的阻燃剂
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申请号: US723173申请日: 1976-09-14
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公开(公告)号: US4094693A公开(公告)日: 1978-06-13
- 发明人: Helmut Knorre , Manfred Langer , Peter Leidl
- 申请人: Helmut Knorre , Manfred Langer , Peter Leidl
- 申请人地址: DT Frankfurt
- 专利权人: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
- 当前专利权人: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
- 当前专利权人地址: DT Frankfurt
- 优先权: DT2542535 19750924
- 主分类号: C04B24/06
- IPC分类号: C04B24/06 ; C04B28/14 ; C04B11/14
摘要:
Industrial gypsum plaster (plaster of Paris) having a delayed setting time is prepared by including D,L-tartaric acid and sufficient calcium hydroxide that a 5 weight % aqueous suspension of the plaster has a pH of at least 11.5.
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