Process for producing a polyethylene-1,2-diphenoxyethane-4,4{40 -dicarboxylate

Abstract

Abstract (in which R'' represents a di-valent aliphatic radical having one to four carbon atoms, or a di-valent aromatic radical and R'''' is an aliphatic radical of one to four carbon atoms), m is an integer of one to four, P represents a numerical valence of the X radical and (4-m/P) is an integer of zero to three. A molded article obtained from said polymer has favorable mechanical properties, particularly a high Rockwell Hardness. Further, fibers obtained from said polymer possess a favorable tenacity, elongation, elastic recovery, boil shrinkage and maximum heat shrinkage stress. A linear polyethylene-1,2-diphenoxylethane-4,4''-dicarboxylate having a favorable heat-stability, whiteness and a high crystallization velocity capable of being die molded in a short time like ''''Delrin'''' is produced by reacting a 1,2-bis-paracarboalkoxy-phenoxyethane having an acid value of 0.03 or less with ethylene glycol in the presence of an ester interchange catalyst, such as a strontium or barium salt of mono-carboxylic acid having one to four carbon atoms or an orthoborate compound of the formula: Sr(B(OCH2CH2OH)(OR3'''''')) 2 or Ba(B(OCH2CH2OH)(OR3'''''')) 2 wherein R'''''' is selected from the group consisting of cyclohexyl, phenyl, cresyl and diphenyl, until methanol or longer evolves, and subsequently continuing the reaction until the desired degree of polymerization is attained at an elevated temperature under a reduced pressure in the presence of, as a polycondensation catalyst, an organotin compound having the formula RmSn X(4-m/P) wherein R is an aliphatic radical having one to four carbon atoms, a 3- to 6-membered alicyclic radical or an aromatic radical, X represents -R, -OR, -OH, SnR3,

Inventors

• 👤 Hidehiko Kobayashi
• 👤 Hiroshi Komoto
• 👤 Masatsugu Yoshino

Bibliographic Details