Method for producing fiber-reinforced composite materials from polyamide 6 and copolyamides made of polyamide 6 and polyamide 12

Patent metadata

Field	Value
Publication number	US-9962889-B2
Application number	US-201013382782-A
Country	US
Kind code	B2
Filing date	Jul 6, 2010
Priority date	Jul 8, 2009
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

The present invention relates to a method for producing fiber-reinforced composite materials, in which a multiplicity of continuous filaments or woven fabric is impregnated optionally together with reinforcing materials, comprising caprolactam and other starting materials for polyamide 6 or other starting materials for copolymers of caprolactam, passed through at temperatures of 70 to 100° C., and anionically polymerized at temperatures of 100 to 190° C., and optionally repolymerized at temperatures of 90 to 170° C.

First claim

The invention claimed is:

1. A method for producing fiber-reinforced composite materials, wherein a multiplicity of continuous filaments or woven fabric is
impregnated, optionally together with reinforcing materials, with a mixture comprising caprolactam and other starting materials for polyamide 6,
passed through at temperatures of 70° to 100° C. that are above the melting temperature of the system,
and thereafter, as a prepreg, cooled below the melting temperature of 70° C.,
and subsequently anionically polymerized at temperatures of 100° to 160° C.,
and repolymerized at temperatures of 90° to 170° C.

2. The method for producing a fiber-reinforced composite material according to claim 1 , wherein repolymerization takes place at temperatures of 100° to 160° C.

3. The method for producing a fiber-reinforced composite material according to claim 1 , wherein the continuous filaments are passed as a strand of fibers through a bath.

4. The method for producing a fiber-reinforced composite material according to claim 1 , wherein an amount not to exceed 20% by weight of the caprolactam has been replaced by comonomers.

5. The method for producing a fiber-reinforced composite material according to claim 1 , wherein mixtures of ϵ-caprolactam and ω-laurolactam are used.

6. The method for producing a fiber-reinforced composite material according to claim 1 , wherein the impregnation of the filaments or woven fabric is carried out at a temperature of 70° to 100° C.

7. The method for producing a fiber-reinforced composite material according to claim 1 , wherein continuous filaments of glass, carbon, aramid, steel, and/or ceramic are used.

8. The method for producing a fiber-reinforced composite material according to claim 7 , wherein continuous filaments of aramid, steel, and/or ceramic are used.

9. The method for producing a fiber-reinforced composite material according to claim 1 , wherein continuous filaments of glass, carbon, aramid, steel, ceramic and/or other temperature-resistant polymeric fibers or filaments are used.

10. The method for producing a fiber-reinforced composite material according to claim 9 , wherein continuous filaments of aramid, steel, ceramic and/or other temperature-resistant polymeric fibers or filaments are used.

11. The method for producing a fiber-reinforced composite material according to claim 1 , wherein high-modulus carbon fibers, silicatic and nonsilicatic glasses, carbon, boron, silicon carbide, metals, metal alloys, metal oxides, metal nitrides, metal carbides, and/or silicates are used as the fiber.

12. The method for producing a fiber-reinforced composite material according to claim 11 , wherein high-modulus carbon fibers, boron, silicon carbide, metals, metal alloys, metal oxides, metal nitrides, metal carbides, and/or silicates are used as the fiber.

13. The method for producing a fiber-reinforced composite material according to claim 1 , wherein polyacrylonitriles, polyesters, ultrastretched polyolefin fibers, polyamides, polyimides, aramids, liquid-crystal polymers, polyphenylene sulfides, polyether ketones, polyether ether ketones, polyetherimides, cotton, cellulose, flax, sisal, kenaf, hemp, and/or abaca, are used as the fiber.

14. The method for producing a fiber-reinforced composite material according to claim 13 , wherein polyacrylonitriles, ultrastretched polyolefin fibers, polyimides, aramids, liquid-crystal polymers, polyphenylene sulfides, polyether ketones, polyether ether ketones, polyetherimides, cotton, cellulose, flax, sisal, kenaf, hemp, and/or abaca, are used as the fiber.

15. The method for producing a fiber-reinforced composite material according to claim 1 , wherein the composite material comprises 40% to 80% by volume of fibers.

16. The method for producing a fiber-reinforced composite material according to claim 1 , wherein anionic polymerization takes place at temperatures of 130° to 160° C.

17. A method for producing fiber-reinforced composite materials, wherein a multiplicity of continuous filaments or woven fabric is
impregnated together with reinforcing materials, with a mixture comprising caprolactam and other starting materials for polyamide 6,
passed through at temperatures of 70° to 100° C. that are above the melting temperature of the system,
and thereafter, as a prepreg, cooled below the melting temperature of 70° C.,
and subsequently anionically polymerized at temperatures of 100° to 160° C.,
and repolymerized at temperatures of 90° to 170° C.

Assignees

• Scherzer Dietrich
• Kory Gad
• Weber Martin
• Basf Se

Inventors

• Scherzer Dietrich
• Kory Gad
• Weber Martin

Classifications

• C08J2377/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08J2377/10 takes precedence) · CPC title

• B29K2077/00

  Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material · CPC title

• C08J5/24

  Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs · CPC title

• B29C70/521 Primary

  and impregnating the reinforcement before the die · CPC title

• B29B15/125

  by dipping · CPC title