Reinforcing-fiber composite material
AssigneeToray Industries, Inc.
InventorsKatsuhiro Miyoshi, Tadashi Watanabe, Yasukazu Ono
Life of this patent
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Abstract
A reinforcing-fiber composite material includes not less than 20 wt % but less than 70 wt % of discontinuous reinforcing fibers, and a matrix resin, wherein at least a portion of the discontinuous reinforcing fibers forms a fiber aggregation, and at least one bundle of the fiber aggregation has a surface that, when projected onto a two-dimensional plane, has at least one region where the number of monofilaments constituting the aggregation is reduced, at opposite ends in a longitudinal direction of a minimum circumscribed rectangle of the projected surface, and at portions other than the opposite ends.
Claims8
A fiber reinforced composite material comprising discontinuous reinforcing fibers accounting for 20 wt % or more and less than 70 wt % and a matrix resin,
- wherein at least part of the discontinuous reinforcing fibers form fiber aggregates, and
- at least one of the fiber aggregates is such that when a face thereof is projected onto a two-dimensional plane, and
- each of two length-directional end portions of a minimum circumscribed rectangle about a projected face and a portion other than the two length-directional end portions contain at least one region in which the number of filaments belonging to the fiber aggregate decreases and is defined as a bow-shaped discontinuous reinforcing fiber aggregate (A);
- wherein 2 wt % or more and 15 wt % or less of all discontinuous reinforcing fibers form discontinuous reinforcing fiber aggregates (1) having a minimum circumscribed rectangle long side length of 30 mm or more, said aggregates being substantially uniformly distributed throughout the composite, and wherein said aggregates have a number average acute angle at both ends of 5°-30°.
A fiber reinforced composite material comprising discontinuous reinforcing fibers accounting for 20 wt % or more and less than 70 wt % and a matrix resin,
- wherein at least part of the discontinuous reinforcing fibers form fiber aggregates, and
- at least one of the fiber aggregates is such that when a face thereof is projected onto a two-dimensional plane, and
- each of two length-directional end portions of a minimum circumscribed rectangle about a projected face and a portion other than the two length-directional end portions contain at least one region in which the number of filaments belonging to the fiber aggregate decreases and is defined as a bow-shaped discontinuous reinforcing fiber aggregate (A);
- wherein a number average of an obtuse angle between the length direction of the minimum circumscribed rectangle of the projected face of each bow-shaped discontinuous reinforcing fiber aggregate (A) and gradients of a region that are located outside the length-directional end portions and in which the number of filaments decreases is 135° or more and 175° or less.
Dependencies are inferred from the claim text.