Composite containing polyolefin fiber and polyolefin polymer matrix
First Claim
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1. A composite structure comprising:
- (a) a network of polyolefin fibers selected from the group consisting of polyethylene and polypropylene fibers having a weight average molecular weight of at least about 500,000, a tenacity of at least about 15 g/denier and a main melting point of at least about 140°
C. for polyethylene fiber, and a tenacity of at least about 11 g/denier and a main melting point of at least about 168°
C. for polypropylene fiber; and
(b) a matrix comprising a polymer having polyethylene or polypropylene crystallinity with a melting or sticking point at least 3°
C. lower than the melting point of the polyolefin fiber;
said composite structure having a tenacity at least 75% of the volume average tenacity of the polyolefin fiber network and the polymer matrix.
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Abstract
A composite containing a network of ultrahigh molecular weight polyethylene or polypropylene fibers of high tenacity and modulus and a matrix which has ethylene or propylene crystallinity, e.g. polyethylene, polypropylene or copolymers. The composite can be formed by heating the matrix to its melting or sticking temperature around the fibers. The composite retains a high proportion of the tenacity of the fiber.
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15 Claims
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1. A composite structure comprising:
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(a) a network of polyolefin fibers selected from the group consisting of polyethylene and polypropylene fibers having a weight average molecular weight of at least about 500,000, a tenacity of at least about 15 g/denier and a main melting point of at least about 140°
C. for polyethylene fiber, and a tenacity of at least about 11 g/denier and a main melting point of at least about 168°
C. for polypropylene fiber; and(b) a matrix comprising a polymer having polyethylene or polypropylene crystallinity with a melting or sticking point at least 3°
C. lower than the melting point of the polyolefin fiber;said composite structure having a tenacity at least 75% of the volume average tenacity of the polyolefin fiber network and the polymer matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification