Copolyesters for high modulus fibers

Details Copolyesters for high modulus fibers Copolyesters for high modulus fibers

C - Chemistry, Metallurgy

08

G

C08G 63/189 (2006.01) C08G 63/185 (2006.01) C08G 63/78 (2006.01) C08J 5/18 (2006.01) D01F 6/84 (2006.01)

Patent

CA 2113639

2113639 9302122 PCTABS00019 Polyester compositions comprising monomer units derived from 2,6-naphthalenedicarboxylic acid, 4,4'-bibenzoic acid and ethylene glycol are useful as fibers and molding resins when the ratio of 4,4'-bibenzoic acid to 2,6-naphthalenedicarboxylic acid is greater than 1:3. These compositions yield fiber with excellent tensile properties, both at room temperature and at elevated temperatures, when the two diacids are present in the composition in a mole ratio of about 60:40 to about 40:60, and especially when the two diacids are included in about equimolar amounts. When these compositions are melt spun at a relatively low melt temperature and high draw down ratio, fibers with excellent tensile properties are obtained without a subsequent drawing step.

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