Help alloying or blending PC and polyester

[Shamika]

Hi,

Can anyone give me a down and dirty formula for blending/alloying polycarbonate with polyester (PET or PBT)? Is there a compatibilizer that is recommended?

Thanks.

 

[dwightdixon]

yes there is a compatilizer required. GE has a patent on the use of it. Why not buy from them?

 

[Shamika]

Instead of buying from GE, I want to know if I can compatbilize my own PC/Polyester.

Does anyone know where I can buy such a compatibilizer?

 

[Demon3]

Polyester and polycarbonate will react with each other in the extruder (transesterification) thus forming block copolymers of polyester and polycarbonate that compatibilise the blend. However, you may need a long residence time in the extruder or more than one pass to get enough reaction. In a former job we added some catalyst to the polyester / polycarbonate blend to speed things up. Normal transesterification catalysts like antimony trioxide work as do many others.


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