Poly(arylene ether ketone), process for producing same and its use
AssigneeTeijin Limited
InventorsShunichi Matsumura, Seiji Itoh, Hiroo Inata, Jiro Sadanobu
Life of this patent
Estimating the term…
Abstract
A poly(arylene ether ketone) of this invention principally comprises recurring units represented by formula ##STR1## wherein Ar.sup.1 denotes a 1,5-naphthalene ring, a 2,6-naphthalene ring, a 2,7-naphthalene ring or a combination of them, and Ar.sup.2 denotes p-phenylene, p,p'-biphenylene, a 1,5-naphthalene ring, a 2,6-naphthalene ring, a 2,7-naphthalene ring or a combination of them. The poly(arylene ether ketone) is high in second-order transition temperature and excellent in solvent resistance and moldability, and can be molded into heat-resistant fibers and electric insulating films.
Claims6
A film of a crystalline poly(arylene ether ketone) in which the Young's modulus is at least 400 kg/mm.sup.2, the crystalline poly(arylene ether ketone) principally comprising recurring units represented by formula (4) ##STR27## and having inherent viscosity of at least 0.3 measured at 30.degree. C. in conc. sulfuric acid,
- wherein main crystal lattice planes oriented parallel to the film surface are crystal lattice planes having spacings of 3.9.+-.0.2 .ANG. and 4.7.+-.0.3 .ANG., and an x-ray diffraction peak intensity ratio [I(4.7 .ANG.)/I(3.9 .ANG.)] of both crystal lattice planes measured by symmetrical-reflection technique is at most 0.4.
A fiber of a crystalline poly(arylene ether ketone) in which the Young's modulus is at least 1000 kg/mm.sup.2, the crystalline poly(arylene ether ketone) principally comprising recurring units represented by formula (4) ##STR28## and having inherent viscosity of at least 0.3 measured at 30.degree. C. in conc. sulfuric acid,
- a crystal size (L.sub.1) normal to a crystal lattice plane which is perpendicular to a fiber axis and a crystal size (L.sub.2) normal to a crystal lattice plane which is parallel to the fiber axis meet the following equations
- 20.ANG.>
- L.sub.1 >70 .ANG.
- 130 .ANG.>L.sub.2 >50 .ANG.
- and a degree of orientation of a crystal is at least 90%.
Dependencies are inferred from the claim text.