Preparation of poly(ethlene-2,6-naphthalene dicarboxylate) from

Details Preparation of poly(ethlene-2,6-naphthalene dicarboxylate) from Preparation of poly(ethlene-2,6-naphthalene dicarboxylate) from

1989-04-12

1991-05-07

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528298, 528308, 528481, 528491, C08G 6320

Patent

active

050138200

ABSTRACT:
This invention relates to a method of preparing poly(ethylene 2,6-naphthalene dicarboxylate) by the polycondensation reaction of ethylene glycol and dimethyl-2,6-naphthalene dicarboxylate, using a dimethyl-2,6-naphthalene dicarboxylate starting material which contains significant amounts of methyl hydrogen 2,6-naphthalene dicarboxylate as a contaminant. The methyl hydrogen 2,6-naphthalene dicarboxylate moiety is incorporated into the polymer structure by initially esterifying the methyl hydrogen 2,6-naphthalene dicarboxylate acid end-group with ethylene carbonate, in the presence of an amine or ammonium catalyst, before the polyesterification/polycondensation reaction is performed.

REFERENCES:
patent: 4117250 (1978-09-01), Foster et al.
patent: 4521585 (1985-06-01), Thomsen et al.
patent: 4594406 (1986-06-01), Thomsen et al.
Chemical Abstracts, vol. 81, No. 24, Dec. 16, 1974, (Columbus, Ohio, U.S.), see p. 56, Abstract 153503p, & JP, A, 7343192 (Teijin LTD) Dec. 17, 1973.

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