Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1994-12-14
1996-07-23
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528271, 528272, C08G 6378
Patent
active
055390781
ABSTRACT:
This invention is an improved process for producing polyester copolymers, which employs a combination of an acid-based process and an ester-based process. The ester-based process is used to manufacture a low molecular weight naphthalate-based polymer, and the acid-based process is used to manufacture phthalate-based oligomers. The low molecular weight naphthalate-based polymer is combined with the phthalate-based oligomers, or the raw materials used to form the phthalate-based oligomers, to form a random polyester copolymer. Specifically, the process of the invention may be employed to manufacture, in an ester-based process, a low molecular weight polyethylene naphthalate polymer, which is then combined with polyethylene terephthalate oligomers produced in an acid-based process, and the acid-based process is then used to continue the polymerization reaction. Ester interchange reactions and further polymerization result in the production of a random polyethylene terephthalate
aphthalate copolymer.
REFERENCES:
patent: 3697579 (1972-10-01), Balint et al.
patent: 4020049 (1977-04-01), Rinehart
patent: 4079046 (1978-03-01), Brignac et al.
patent: 4447595 (1984-05-01), Smith et al.
patent: 5101008 (1992-03-01), Cooke et al.
Burkett Eugene J.
Callander Douglas D.
Galko Joseph
Sisson Edwin A.
Mosley Terressa
Muller Kim
Seidleck James J.
Shell Oil Company
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