DUSSELDORF, GERMANY - An Italian company has developed a new technology to polymerize PET called solid state polyaddition. Hussain Al Ghatta, research and development director of M&G Richerche SpA, presented a paper on the subject in Dusseldorf Oct. 4 at Plastics High Performance Packaging. He said the technology is based on polymerizing the material in the solid state using as short a melt stage as possible.
In the first stage of the process, called the extrusion mixing step, polyester and reactive chemicals are mixed in a very short melt phase of less than one minute. In the second stage, the solid-state polyaddition step, the PET is upgraded to the desired final intrinsic viscosity.
Al Ghatta said the process also can be applied for polyester blending and alloying, according to the paper.
He claimed the technology increases the molecular weight of PET and PET alloys while avoiding side reactions that can arise in the melt phase of polymerization.
M&G Richerche, which is headquartered in Pozzilli, Italy, specializes in new polyester polymers for rigid packaging and the production technologies of polyester and cellulosic-based polymers.