Process for the preparation of polyester resins

Details Process for the preparation of polyester resins Process for the preparation of polyester resins

C - Chemistry, Metallurgy

08

G

402/187

C08G 63/123 (2006.01) C08G 63/49 (2006.01) C08G 63/78 (2006.01)

Patent

CA 1329675

Process for the preparation of polyester resins Abstract The invention relates to a process for the preparation of polyester and alkyd resins from bifunctional and/or polyfunctional carboxylic acids and/or derivatives there- of and from bifunctional and/or polyfunctional alcohols. The reaction is carried out in stirred kettle reactors which are operated discontinuously and equipped with rec- tifying columns. During the entire reaction an entrain- ing 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 re- action rate has been reached. The pressure is then re- duced to atmospheric pressure at a gradient of -0.05 bar/ hour to -5 bar/hour in a second reaction phase. The re- action is continued under normal pressure until the pro- duct exhibits the desired properties. The reaction temper- ature is between 180 and 320°C. The process times, in particular are shortened as a re- sult of this process, and the process products, which are exposed to heat for a correspondingly shorter time, are distinguished by improved properties.

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