发明授权
US4745151A Process for the production of aqueous dispersions of polyurethane
polyureas, the dispersions obtainable by this process and their use as
coating compositions
失效
用于生产聚氨酯聚脲的水性分散体的方法,可通过该方法获得的分散体及其作为涂料组合物的用途
- 专利标题: Process for the production of aqueous dispersions of polyurethane polyureas, the dispersions obtainable by this process and their use as coating compositions
- 专利标题(中): 用于生产聚氨酯聚脲的水性分散体的方法,可通过该方法获得的分散体及其作为涂料组合物的用途
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申请号: US38256申请日: 1987-04-14
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公开(公告)号: US4745151A公开(公告)日: 1988-05-17
- 发明人: Klaus Noll , Jurgen Mosbach , Josef Pedain , Klaus Nachtkamp , Jurgen Schwindt
- 申请人: Klaus Noll , Jurgen Mosbach , Josef Pedain , Klaus Nachtkamp , Jurgen Schwindt
- 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: DEX3613492 19860422
- 主分类号: C08G18/08
- IPC分类号: C08G18/08 ; C08G18/10 ; C08G18/32 ; C08G18/66 ; C08G18/75 ; C08G18/76 ; C09D175/00 ; C08L75/04
摘要:
The present invention is directed to a process for the production of aqueous polyurethane-polyurea dispersions by reacting NCO-prepolymers having an average NCO-functionality of 2 to 2.3 and an average molecular weight of about 700 to about 5000 with organic polyamines having an average amine functionality of 2.05 to about 3 and an average molecular weight of 60 to about 2000 containing primary and/or secondary amino groups at an NCO/NH ratio about 1.05:1 to about 7:1 in the presence of a water-miscible, weakly polar solvent inert to isocyanate groups and having a boiling point at normal pressure below 100.degree. C., converting the resulting solution of the reaction products into an aqueous dispersion by the addition of water and optionally removing the solvent used by distillation, characterized in that the reactants and amounts used are selected such that the resulting reaction products have an NCO-functionality of 2.2 to about 3 and NCO-content of about 0.1 to 5% by weight. The present invention is also directed to the products of this process and their use for the production of coatings.