Noncircular cross-section carbon fiber, process for producing th

Details Noncircular cross-section carbon fiber, process for producing th Noncircular cross-section carbon fiber, process for producing th

1990-08-31

1993-07-13

Lewis, Michael

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

264 292, 264 295, 4234471, 4234472, 4234474, 4234476, 428323, 428408, B32B 900, D01F 914

Patent

active

052272370

ABSTRACT:
A noncircular cross-section carbon fiber wherein the cross-section is a noncircular one having at least one plane of symmetry passing the centroid and having an angle of rotational symmetry, .theta., defined by .theta.=360.degree.
, in which n is an integer of 1 to 10; wherein the internal structure has no lamellar structure and the fiber has a substantially uniform crystalline structure; and wherein the fiber surface has a surface smoothness S of 1.16 or below and the tensile strength and the tensile modulus of the fiber in the form of a resin-impregnated strand is 300 kg/mm.sup.2 or above and 20 ton/mm.sup.2 or above, respectively; a process for producing such carbon fiber; and a composite of such carbon fiber with a resin.

REFERENCES:
patent: Re30414 (1980-10-01), Kinoshita
patent: 3600491 (1971-08-01), Shimoda et al.
patent: 4535027 (1985-08-01), Kobashi et al.
patent: 4628001 (1986-12-01), Sasaki et al.
patent: 4695415 (1987-09-01), Setsui et al.
patent: 4935180 (1990-06-01), Daumit et al.

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