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EP0217563A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid crystal fiber-reinforced polymer composite and process for preparing same

Assignee: University of Akron
•
Filing: 1986-09-08
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Granted: —
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Expires: 2006-09-08
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Abstract

Abstract Novel self-reinforced polymer composites of a base polymer with a melt processable liquid crystal polymer are prepared according to this invention. The base polymer is a flexible chain polymer, e.g. a conventional thermoplastic. Poly­carbonate is a particularly suitable base polymer. The liquid crystal polymer is melt processable, that is, it has a melting point and exhibits aniso­tropic properties in the melt phase. Wholly aromatic copolyesters are particularly suitable. Mixing is carried out at a temperature at which both the base polymer and the liquid crystal are melt processable, i.e., at a temperature at which the base polymer flows readily and the liquid crystal polymer is above its melting point. The products of this invention comprise about 2 to 20 percent by weight of liquid crystal polymer, which is in the form of essentially unidirectionally oriented continuous fibers primarily in the range of about 1 to 10 micrometers in diameter, distri­buted in a matrix of the base polymer. The polymer composites of this invention have high tensile strength in both the fiber direction and the trans­verse direction, and also have high modulus, satis­factory elongation, good impact strength, and good high temperature properties.

Inventors

  • 👤 Avraam Isayev
  • 👤 Michael John Modic

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 11:13
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; C08L101/00; C08L69/00

Claims Analysis

Total Claims: 15
Claim 1
Independent Claim 98 words
A process for preparing a self-reinforced polymer composite comprising a flexible chain base polymer and a melt processable liquid crystal polymer which is incompatible with the base polymer, which comprises extruding and mixing a base polymer with from about 2 to about 20 percent by weight of a melt processable liquid crystal polymer at a temperature at which both polymers are melt processable, and recovering a self-reinforced polymer composite comprising said base polymer and said liquid crystal polymer, said liquid crystal polymer being in the form of essentially unidirectionally oriented fibers in a matrix of said base polymer.
Claim 2
Dependent Claim 98 words
A process for preparing a self-reinforced polymer composite comprising a flexible chain base polymer and a melt processable liquid crystal polymer which is incompatible with the base polymer, which comprises extruding and mixing a base polymer with from about 2 to about 20 percent by weight of a melt processable liquid crystal polymer at a temperature at which both polymers are melt processable, and recovering a self-reinforced polymer composite comprising said base polymer and said liquid crystal polymer, said liquid crystal polymer being in the form of essentially unidirectionally oriented fibers in a matrix of said base polymer.
Claim 3
Dependent Claim 13 words
A process according to Claim 1, in which said base polymer is thermoplastic.
Claim 4
Dependent Claim 13 words
A process according to Claim 1, in which said base polymer is polycarbonate.
Claim 5
Dependent Claim 13 words
A process according to Claim 1, in which said base polymer is polyetherimide.
Claim 6
Dependent Claim 25 words
A process according to any of Claims 1 to 4, in which the mixing temperature is above the melting point of the liquid crystal polymer.
Claim 7
Dependent Claim 22 words
A process according to any one of Claims 1 to 5, in which the liquid crystal polymer is a wholly aromatic polyester.
Claim 8
Dependent Claim 24 words
A process according to Claim 1, in which said base polymer is a polycarbonate and said liquid crystal polymer is a wholly aromatic polyester.
Claim 9
Dependent Claim 26 words
A process according to any one of Claims 1 to 7, in which said mixing includes coextrusion of said base polymer and said liquid crystal polymer.
Claim 10
Dependent Claim 18 words
A process according to any one of Claims 1 to 8, in which the polymer composition is pelletized.
Claim 11
Dependent Claim 26 words
A process according to any one of Claims 1 to 9, in which the polymer composition is formed into a shaped article, tape, film or fiber.
Claim 12
Dependent Claim 60 words
A self-reinforced polymer composite comprising: a flexible chain base polymer, and from about 2 percent to about 20 percent by weight of a melt processable liquid crystal polymer which is incompatible with said base polymer, said liquid crystal polymer being in the form of essentially unidirectionally orientated fibers which are formed in situ in a matrix of said base polymer.
Claim 13
Dependent Claim 60 words
A self-reinforced polymer composite comprising: a flexible chain base polymer, and from about 2 percent to about 20 percent by weight of a melt processable liquid crystal polymer which is incompatible with said base polymer, said liquid crystal polymer being in the form of essentially unidirectionally orientated fibers which are formed in situ in a matrix of said base polymer.
Claim 14
Dependent Claim 14 words
A polymer composition according to Claim 11, in which said base polymer is thermoplastic.
Claim 15
Dependent Claim 15 words
A polymer composite according to Claim 11, in which said base polymer is a polycarbonate.

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