发明授权
- 专利标题: Process for the preparation of cellular or non-cellular polyurethane resins
- 专利标题(中): 制备细胞或非细胞聚氨酯树脂的方法
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申请号: US039050申请日: 1979-05-14
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公开(公告)号: US4255529A公开(公告)日: 1981-03-10
- 发明人: Edgar Mohring , Hanns P. Muller , Kuno Wagner
- 申请人: Edgar Mohring , Hanns P. Muller , Kuno Wagner
- 申请人地址: DEX Leverkusen
- 专利权人: Bayer Aktiengesellschaft
- 当前专利权人: Bayer Aktiengesellschaft
- 当前专利权人地址: DEX Leverkusen
- 优先权: DEX2738154 19770824
- 主分类号: C07C27/00
- IPC分类号: C07C27/00 ; B01J27/00 ; B01J31/00 ; C07B61/00 ; C07C67/00 ; C07H3/02 ; C07H3/04 ; C08G6/00 ; C08G18/32 ; C08G18/42 ; C08G18/48 ; C08G18/14 ; C08G18/54
摘要:
This invention relates to an improved process for the preparation of formose by the condensation of aqueous formaldehyde. In the process according to this invention, tertiary amines which contain an electrophilic hetero atom in the .beta.-position to the tertiary nitrogen atom are used for controlling the pH instead of the inorganic bases which have previously been used for this purpose.
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