Process for preparing polyvinyl alcohol gel and a gel exhibiting extreme mechanical stability prepared in such a manner
- 申请公布号：
- CZ20004603(A3)
- 申请号：
- CZ20000004603
- 申请日期：
- 1999.03.30
- 申请公布日期：
- 2001.10.17
- 申请人：
- VORLOP KLAUS-DIETER PROF. DR.
- 发明人：
- VORLOP KLAUS-DIETER PROF. DR.;JEKEL MAREN
- 分类号：
- C08J3/075;C08L29/04;C08L71/02;(IPC1-7):C08J3/075
- 主分类号：
- C08J3/075
- 摘要：
- <p>A polyvinyl alcohol gel can be easily and quickly produced by a process having the following steps: (a) use of an aqueous polyvinyl alcohol solution with a degree of hydrolysis >/=98 % by moles; (b) admixture of an additive that is dissolved in the aqueous polyvinyl alcohol solution and forms a separate, finely distributed and aqueous phase after concentration of the solution; (c) drying of the aqueous solution to a residual water content of maximum 50 wt. % to cause the phases to separate and hence the polyvinyl alcohol to gel; (d) rehydrating the polyvinyl alcohol in an aqueous medium.</p>
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