Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1978-07-11
1980-04-01
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
260 457R, 260 4575C, 528488, 528491, C08G 6306, C08G 6318
Patent
active
041962796
ABSTRACT:
An improved process for producing a linear polyester having a high degree of polymerization which comprises first preparing a prepolymer of polyester and then polycondensing the prepolymer. In the first step, a prepolymer having an intrinsic viscosity of at least 0.2 is prepared, and the subsequent polycondensation is carried out in the presence of an organic boron compound of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent an alkyl, aralkyl or aryl group having 6 to 20 carbon atoms, and M represents a monovalent metal. According to this method, the polycondensation can be performed at atmospheric pressure, and a substantially linear polyester having an intrinsic viscosity of at least 0.5 and superior thermal stability can be obtained rapidly.
REFERENCES:
patent: 3328355 (1967-06-01), Dawes et al.
patent: 3391123 (1968-07-01), Steadly
patent: 3530098 (1970-09-01), Schweizer
patent: 3644217 (1972-02-01), Cyba
patent: 3904707 (1975-09-01), Gebhart et al.
patent: 4116931 (1978-09-01), Minhas et al.
Azuma Shizuo
Kawase Shoji
Saiki Noritsugu
Phynes Lucille M.
Teijin Limited
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