发明授权
- 专利标题： Hydrolytically stable urea-formaldehyde resins and process for manufacturing them
- 专利标题（中）： 水解稳定的脲醛树脂及其制造方法
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申请号： US416573申请日： 1982-09-10
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公开(公告)号： US4410685A公开(公告)日： 1983-10-18
- 发明人: James H. Williams
- 申请人： James H. Williams
- 申请人地址： OH Columbus
- 专利权人： Borden, Inc.
- 当前专利权人： Borden, Inc.
- 当前专利权人地址： OH Columbus
- 主分类号： C08G12/02
- IPC分类号： C08G12/02 ; C08G12/12 ; C08G12/38 ; C08L61/24 ; C09J161/24
摘要：
A process for preparing a urea-formaldehyde base resin having a F/U molar ratio of 1.0:1-1.2:1, that is hydrolytically stable, which comprises adjusting a formaldehyde solution to a pH of 0.5-2.5, slowly charging urea to said formaldehyde solution while maintaining the temperature at 40.degree.-70.degree. C., neutralizing the reaction mixture after obtaining a Gardner viscosity in the range of T+-V+, then adding the final charge of urea and permitting equilibration.
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