Claims
- 1. A prepreg layer for combination with one or more additional layers of said prepreg to form a fiber-reinforced plastic composite, said prepreg layer comprising:
- (A) a multiplicity of reinforcing fibers (A) having fiber lengths of at least 5 cm,
- (B) a matrix resin body (B) in which said reinforcing fibers (A) are embedded, and
- (C) a plurality of individual discrete surface region thermoplastic resin fibers (C) in the form of a non-woven fabric having fiber lengths of 3 cm or more, said fibers (C) being arranged at random on and within said surface portion of said matrix resin body (B), said fibers (C) being localized in a surface region adjacent said surface, said surface region extending to a depth of 30% into the thickness direction of said prepreg layer, wherein more than 90% of said thermoplastic fibers (C) are localized in said surface region.
- 2. The prepreg layer defined in claim 1, wherein 90% of said fibers (C) are localized in a depth of 20% in said thickness direction.
- 3. The prepreg layer defined in claim 1, wherein said matrix resin body (B) has an exposed surface having both exposed thermoplastic fibers (C) and exposed thermoplastic resin (B).
- 4. The prepreg layer defined in claim 1, wherein said matrix resin body (B) is a thermosetting resin.
- 5. The prepreg layer defined in claim 1, wherein said matrix resin body (B) is an epoxy resin.
- 6. The prepreg layer defined in claim 1 wherein said resin (B) is a cured resin structurally separated into a microphase mainly composed of a thermosetting resin and a microphase mainly composed of a thermoplastic resin.
- 7. The prepreg layer defined in claim 6, wherein said thermoplastic resin microphase has the form of a three-dimensionally continuous network.
- 8. The prepreg layer defined in claim 6, wherein each of said thermoplastic and thermosetting microphases have the form of three-dimensionally continuous networks.
- 9. The prepreg layer defined in claim 1, wherein the percentage of said thermoplastic resin fibers (C) is 2-30% of the combined weight of said fibers (C) plus said matrix resin (B).
- 10. The prepreg layer defined in claim 9, wherein said percentage is 2-20%.
- 11. The prepreg layer defined in claim 9, wherein said percentage is 4-13%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-004715 |
Jan 1993 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/562,623, filed Nov. 24, 1995, abandoned, which is a continuation of application Ser. No. 08/302,763, filed Oct. 5, 1994, abandoned.
US Referenced Citations (10)
Non-Patent Literature Citations (1)
Entry |
Improved Toughness of Carbon Fiber Composites Via the Use of Thermoplastic Interplies, Carroll, Bill, 33rd International SAMPE Symposium, Mar. 7-10, 1988, pp. 78-91. |
Continuations (2)
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Number |
Date |
Country |
Parent |
562623 |
Nov 1995 |
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Parent |
302763 |
Oct 1994 |
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