Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1979-06-12
1980-12-09
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528309, 528480, 528481, 560190, 560204, C08G 6326, C07D21130
Patent
active
042385938
ABSTRACT:
A high molecular weight polyester is produced by a two stage process: a partial melt process until the intrinsic viscosity of the polyester prepolymer reaches from about 0.35 to about 0.62 dl/g, and a solid state polymerization in a static bed until the intrinsic viscosity of the polycondensed polymer reaches at least 0.70 dl/g. The melt process employs greater concentrations of initial acid in combination with a heel or the addition of make-up acid to achieve optimal carboxyl content for the polyester prepolymer capable of use in the static bed solid state polymerization. This prepolymer with an optimal carboxyl content achieves a maximum solid state polymerization rate in a static bed. The production of the high molecular weight polyester by the two stage process minimizes chemical instability and deleterious polymerization byproducts.
REFERENCES:
patent: 4154920 (1979-05-01), Jabarin
patent: 4161578 (1979-07-01), Herron
patent: 4165420 (1979-08-01), Rinehart
Phynes Lucille M.
The Goodyear Tire & Rubber Company
LandOfFree
Method for production of a high molecular weight polyester prepa does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for production of a high molecular weight polyester prepa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for production of a high molecular weight polyester prepa will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2281402