Polyethylene isophthalate having reduced cyclic dimer content an

Details Polyethylene isophthalate having reduced cyclic dimer content an Polyethylene isophthalate having reduced cyclic dimer content an

1982-09-07

1983-11-29

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528295, 5282953, 528302, C08G 6304, C08G 6322, C08G 6354

Patent

active

044181884

ABSTRACT:
This invention relates to polyethylene isophthalate (PEI) and copolymers thereof having low cyclic dimer content and process for making same. The invention provides a process for making PEI using protonic acid catalysts which result in a polymer having lower amounts of ring dimer of ethylene isophthalate than has heretofore been known. Strong protonic acids such as sulfuric or phosphoric are utilized as polymerization catalysts to thereby lower the amount of cyclic dimerization which occurs during the polymerization process. Polymers so produced are of a high purity and have reduced manufacturing costs due both to a smaller amount of material being lost as cyclic dimer and because of lower processing costs associated with cleaning cyclic dimer from the processing equipment.

REFERENCES:
patent: 4065439 (1977-12-01), Ono et al.
patent: 4073777 (1978-02-01), O'Neill et al.
patent: 4154918 (1979-05-01), Buxbaum et al.
patent: 4254001 (1981-03-01), Tung
patent: 4350807 (1982-09-01), McConnell et al.
patent: 4383106 (1983-05-01), Tung

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