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1. 发明专利

CA1329675C PROCESS FOR THE PREPARATION OF POLYESTER RESINS 未知
公开(公告)号：CA1329675C
公开(公告)日：1994-05-17
申请号：CA596560
申请日：1989-04-13
申请人： BASF LACKE & FARBEN
发明人： SADLOWSKI JUERGEN , DIEFENBACH HORST , DANGSCHAT MANFRED , LASAR THEO , SCHMITT DIETER
IPC分类号： C08G63/78 , C08G63/123 , C08G63/49
摘要： Process for the preparation of polyester resins The invention relates to a process for the preparation of polyester and alkyd resins from bifunctional and/or polyfunctional carboxylic acids and/or derivatives thereof and from bifunctional and/or polyfunctional alcohols. The reaction is carried out in stirred kettle reactors which are operated discontinuously and equipped with rectifying columns. During the entire reaction an entraining agent is introduced into the reaction mixture below surface level, with thorough distribution, by means of a delivery device in order to improve the transport of the products of the condensation reaction. In addition, the condensation reaction is carried out under an absolute pressure of 1.5 to 10 bar at least until the maximum reaction rate has been reached. The pressure is then reduced to atmospheric pressure at a gradient of -0.05 bar/ hour to -5 bar/hour in a second reaction phase. The reaction is continued under normal pressure until the product exhibits the desired properties. The reaction temperature is between 180 and 320.degree.C. The process times, in particular are shortened as a result of this process, and the process products, which are exposed to heat for a correspondingly shorter time, are distinguished by improved properties.

2. 发明专利

BR8907369A 未知
公开(公告)号：BR8907369A
公开(公告)日：1991-04-16
申请号：BR8907369
申请日：1989-02-22
申请人： BASF LACKE & FARBEN
发明人： SADLOWSKI JUERGEN , DANGSCHAFT MANFRED , DIEFENBACH HORST , SCHMITT DIETER , LASAR THEO
IPC分类号： C08G63/78
摘要： PCT No. PCT/EP89/00162 Sec. 371 Date Nov. 15, 1990 Sec. 102(e) Date Nov. 15, 1990 PCT Filed Feb. 22, 1989 PCT Pub. No. WO89/09794 PCT Pub. Date Oct. 19, 1989.The invention relates to a process for the preparation of polyester and alkyd resins from bifunctional and/or polyfunctional carboxylic acids and/or derivatives thereof and from bifunctional and/or polyfunctional alcohols. The reaction is carried out in stirred kettle reactors which are operated discontinuously and equipped with rectifying columns. During the entire reaction an entraining agent is introduced into the reaction mixture below surface level, with thorough distribution, by means of a delivery device in order to improve the transport of the products of the condensation reaction. In addition, the condensation reaction is carried out under an absolute pressure of 1.5 to 10 bar at least until the maximum reaction rate has been reached. The pressure is then reduced to atmospheric pressue at a gradient of -0.05 bar/hour to -5 bar/hour in a second reaction phase. The reaction is continued under normal pressure until the product exhibits the desired properties. The reaction temperature is between 180 and 320 DEG C. The process times, in particular, are shortened as a result of this process, and the process products, which are exposed to heat for a correspondingly shorter time, are distinguished by imprved properties.

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