| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of producing a polyvinyl acetal resin capable of suppressing heat degradation in a temperature-raising step and generation of byproducts without using an acid catalyst, and obtaining the polyvinyl acetal resin having a high degree of acetalization in a short time, and to provide the method of producing the polyvinyl acetal resin capable of efficiently producing without giving rise to occlusion of resin in a production line during or after reaction even if a raw material is a highly concentrated polymer solution. <P>SOLUTION: The method of producing the polyvinyl acetal resin comprises contacting a raw material mixture liquid containing a polyvinyl alcohol resin and an aldehyde with a high temperature and high pressure fluid in a flowing type reaction apparatus to react them at a temperature of 100-400°C and at a pressure of 0.5-100 MPa. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
