Process for solid phase polymerization of polyester

Details Process for solid phase polymerization of polyester Process for solid phase polymerization of polyester

1978-05-12

1979-07-17

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528309, C08G 6318

Patent

active

041615786

ABSTRACT:
A process for the continuous production of high molecular weight polyethylene terephthalate wherein the granular polymer having an intrinsic viscosity of at least 0.4 is crystallized, dried and polymerized in the solid phase by polycondensation. Two methods of crystallization are described which aid the process in overcoming problems associated with sticking in the polymerization stage. The method is characterized by polycondensation at a temperature greater than the crystallization temperature.

REFERENCES:
patent: 4064112 (1977-12-01), Rothe et al.

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