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Modified fibers for use in the formation of thermoplastic fiber-reinforced composite articles and process

Inactive Publication Date: 2008-07-03
JOHNS MANVILLE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024](c) extruding the discontinuous glass fibers having said finely roughened surfaces together with a thermoplastic matrix wherein the surface-attached nanoparticles of inorganic material serve to promote the secure bonding of the discontinuous glass fibers within the thermoplastic to form a material suitable for molding, and
[0025](d) injection or compression molding said material incorporating the discontinuous glass fibers having the finely roughened surfaces to form a fiber-reinforced thermoplastic composite article which displays an enhanced mechanical property.

Problems solved by technology

Otherwise, various forms of product failure may occur during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example i

[0049]An aqueous dispersion of colloidal silica available from Eka Chemicals, Inc. under the Bindzil® 830 designation was selected as the source of the nanoparticles of an inorganic material. Such nanoparticles were amorphous and generally spherical in configuration, possessed a specific surface area of approximately 300 m2 / g, and an average particle size of approximately 10 nm.

[0050]To 827 g of water were added under agitation 110 g of Michem® ME91735 polypropylene grafted with maleic anhydride emulsion serving as a film-former available from Michelman, Inc., 18 g of A-1100 γ-aminopropyltriethoxysilane reactive silane coupling agent commercially available from Momentive Performance Materials, Witton, Conn., U.S.A., 1.6 grams of Mapeg® 200 ML PEG (200) ester monolaurate surfactant or lubricant commercially available from the BASF Corporation, 43 grams of the alkaline aqueous dispersion of silica nanoparticles, and 0.1 gram of DEE FO PI-35 polysiloxane-based defoamer in neat form and...

example ii

[0058]An aqueous dispersion of colloidal silica available from Grace Davison of Columbia, Md., U.S.A., under the Ludox® SM designation was selected as the source of nanoparticles of inorganic material. Such nanoparticles possessed a specific surface area 350 m2 / g, and the aqueous dispersion of colloidal silica was included in the alkaline aqueous size composition in a concentration of 15.0 percent by weight.

[0059]The additional components of alkaline aqueous size composition were 64.9 percent of Hydrosize® PP2-01 functionalized polypropylene aqueous dispersion available from Hydrosize Technologies, Inc. of Raleigh, N.C., U.S.A., serving as a film former, 17.5 percent of A-1100 γ-aminopropyltriethoxysilane reactive silane coupling agent available from Momentive Performance Materials, 2.5 percent Mapeg® 200 ML PEG (200) ester monolaurate surfactant or lubricant available from BASF Corporation, and 0.1 percent of DEE FO PI-35 polysiloxane-based defoamer available from Ultra Additives. ...

example iii

[0066]An aqueous dispersion of colloidal silica available from Eka Chemicals, Inc. under the designation of Bindzil® 215 designation was selected as the source of nanoparticles of inorganic material. Such nanoparticles possessed a specific surface area 600 m2 / g, and the aqueous dispersion of colloidal silica was included in the alkaline aqueous size composition in a concentration of 15.0 percent.

[0067]The additional components of alkaline aqueous size composition were 64.9 percent of Michem® ME 91735 polypropylene grafted with maleic anhydride emulsion available from Michelman, Inc., serving as a film former, 17.5 percent of A-1100 γ-aminopropyltriethoxysilane reactive silane coupling agent available from Momentive Performance Materials, 2.5 percent Mapeg® 200 ML PEG (200) ester monolaurate surfactant or lubricant available from BASF Corporation, and 0.1 percent of DEE FO PI-35 polysiloxane-based defoamer available from Ultra Additives. The alkaline aqueous size composition possesse...

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Abstract

A surface-modified fibrous material is provided for incorporation in a thermoplastic matrix to form a fiber-reinforced composite article. Good binding between the fibrous material and the thermoplastic matrix is achieved through the presence of finely roughened surfaces on the fibers of nanoparticles of an inorganic material. Such nanoparticles are provided from an alkaline aqueous size composition containing the nanoparticles dispersed therein (as described). The fibrous material may be provided in continuous or discontinuous form. In a preferred embodiment glass fibers are initially provided in continuous form followed by cutting into discontinuous lengths and drying with the retention of the nanoparticles on the surfaces of the fibers. The surface-roughened fibrous material is incorporated in a thermoplastic matrix as fibrous reinforcement with the application of heat whereby the thermoplastic matrix is rendered melt processable. In preferred embodiments injection or compression molding is utilized. Improved long-fiber thermoplastics also may be formed to advantage.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. application Ser. No. 11 / 645,963 filed Dec. 27, 2006.FIELD OF THE INVENTION[0002]The subject invention pertains to the formation of improved fibers for incorporation in a thermoplastic matrix to form a fiber-reinforced composite article. Enhanced binding between the thermoplastic matrix and the glass fiber reinforcement is made possible.DESCRIPTION OF RELATED ART[0003]Various binders and sizing compositions are known to improve the handling characteristics of fibrous materials.[0004]When fibers are incorporated in the continuous phase of a thermoplastic polymeric matrix material to serve a reinforcing role it is advantageous that the fibers also bind to some degree to the continuous phase of the matrix material of the resulting fiber-reinforced composite article. Otherwise, various forms of product failure may occur during use. For instance, various coupling agents commonly are being emplo...

Claims

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Application Information

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IPC IPC(8): D02G3/00B29D11/00C03B37/16
CPCC03C25/101C08J5/08D06M11/00Y10T428/2938D06M2200/50Y10T428/2933Y10T428/24372D06M23/08C03C25/47C03C25/42C08J2323/12D06M11/79D06M13/513D06M15/227
Inventor ASRAR, JAWEDBURGHARDT, THOMAS
Owner JOHNS MANVILLE CORP
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