Naphthalate polyester filaments

Details Naphthalate polyester filaments Naphthalate polyester filaments

1976-01-05

1977-11-29

Schain, Howard E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

264210F, 264290T, 264342R, C08G 6318, C08G 6370

Patent

active

040605167

ABSTRACT:
Naphthalate polyester filaments, yarns or fibers consisting essentially of a naphthalate polyester which has an intrinsic viscosity of 0.3 to 3.5 and a softening point of at least 200.degree. C, and in which at least 85 mol% of the total recurring units consist of units of the formula ##STR1## wherein n is 4 or 6, and having at least one diffraction peak at a Bragg scattering angle 2.theta. = 16.3.degree. -- 16.7.degree. and/or 2.theta. = 25.3.degree. - 25.8.degree. in their X-ray diffraction. These filaments, yarns or fibers are useful especially as an electrically insulating material, an elastomeric reinforcing material, a fluid filter material, a paper-making canvas and a fastener component material.
Of these, filaments, yarns or fibers of poly(tetramethylene 2,6-naphthalate) are prepared by melt-spinning the polymer thereby to form undrawn filaments having a birefringence of at lest 0.01 and a density of not more than 1.300, drawing the undrawn filaments in at least one step at a temperature of at least 60.degree. C. at a total draw ratio of at least 1.8, and then heat-treating the drawn filaments at a temperature higher than the temperature employed in the drawing step and within a range of 100.degree. to 240.degree. C. at constant length, under a restricted shrinkage of not more than 15%, or under a stretch of not more than 15%.

REFERENCES:
patent: 2615784 (1952-10-01), McClellan
patent: 3293223 (1966-12-01), Duling
patent: 3377319 (1968-04-01), Wiener
patent: 3706111 (1972-12-01), Curtain et al.
patent: 3816486 (1974-06-01), Vail
Ludewig, Polyester Fibers, Chemistry and Technology, Wiley-Interscience, N. Y. (1964) pp. 275, 247 & 248.

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