Continous process for producing polyol modified polyalkenylene terephthalate
The present invention relates to a continuous process for the production of polyol modified polyalkenylene terephthalates and the application of such polyol modified polyalkylene therephtalate on wire enamels.
1. A continuous process for producing a polyol modified polyalkylene terephthalate, the continuous process comprising:
introducing components in a continuous reactor comprising a reaction zone, the components including a polyalkylene terephthalate, a polyol, and a transesterification catalyst;
reacting the components in the reaction zone of the reactor at a temperature in the range of 180° C. to 350° C. to produce a polyol modified polyalkylene terephthalate;
wherein the polyol includes one or more of tris(2-hydroxyethyl)isocyanurate and glycerine, and
wherein reacting the components is performed in a melt of the polyalkylene terephthalate.
2. The continuous process of claim 1 , wherein the continuous process is performed in an extruder.
3. The continuous process of claim 1 , wherein the melt of the polyalkylene terephthalate is substantially without a solvent.
4. The continuous process of claim 1 , wherein reacting the components is performed in the absence of a solvent.
5. The continuous process of claim 1 , wherein the polyalkylene terephthalate is polyethylene terephthalate or polybutylene terephthalate.
6. The continuous process of claim 1 , wherein the amount of the polyol introduced in the continuous reactor includes at least 0.5 mol OH groups per 100 g of the polyalkylene terephthalate.
7. The continuous process of claim 1 , wherein the Mn (number average) molecular weight of the polyol modified polyalkylene terephthalate is in the range of 800 to 3000 Daltons.
8. The continuous process of claim 1 , wherein the amount of the transesterification catalyst introduced is in the range of 100 to 10000 ppm calculated on the sum of the polyalkylene terephthalate, the polyol, and the transesterification catalyst components.
9. The continuous process of claim 1 , wherein the transesterification catalyst is a lewis acid.
10. The continuous process of claim 1 , wherein the polyol further comprises one or more of trimetylolpropane and pentaerythritol.
11. The continuous process of claim 1 , wherein the polyol is tris(2-hydroxyethyl)isocyanurate or glycerine.
12. The continuous process of claim 1 , wherein the continuous process further comprises removing the polyol modified polyalkylene terephthalate from the reactor.
13. The continuous process of claim 1 , further comprising dissolving the polyol modified polyalkylene terephthalate in a solvent to produce a dissolved polyol modified polyalkylene terephthalate.
14. The continuous process of claim 13 , further comprising adding one or more of an additive and a diluent to the dissolved polyol modified polyalkylene terephthalate.
15. The continuous process of claim 1 , further comprising applying the polyol modified polyalkylene terephthalate on a wire.
16. The continuous process of claim 15 , further comprising adding one or more of an additive and a diluent to the dissolved polyol modified polyalkylene terephthalate.