Chemistry of carbon compounds – Dipeptides – e.g. – aspartame – anserine – carnosine – etc.
Patent
1975-04-03
1977-01-04
Seccuro, Carman J.
Chemistry of carbon compounds
Dipeptides, e.g., aspartame, anserine, carnosine, etc.
526254, 528481, C08L 2712
Patent
active
040013510
ABSTRACT:
It is known to heat treat melt-processible blends of copolymers of tetrafluoroethylene and hexafluoropropylene in the molten state at elevated temperatures for several hours in the presence of an atmosphere containing water vapor in order to remove volatile material from the copolymer and to improve the thermal stability of the copolymer. Such heating results in foaming of the molten copolymer which is undesirable because it slows down the production rate. According to the process of this invention, the production rate can be increased by employing two or more of the copolymers separately in the heat treatment, at least one copolymer having a melt viscosity higher, and at least one copolymer having melt viscosity lower, than the final desired viscosity of the blend, and then blending the copolymers after the heat treatment.
E. I. Du Pont de Nemours and Company
Seccuro Carman J.
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