04894105 is referenced by 43 patents and cites 67 patents.

An improved multifilamentary fibrous material is formed having particles of a matrix-forming thermoplastic polymer substantially uniformly dispersed among adjoining filaments in the absence of fusion bonding. The polymer particles initially are dispersed in an aqueous medium containing an effective amount of a dissolved polymeric binding agent and the viscosity of the medium subsequently is substantially increased to at least 50,000 cps. to form a gelled impregnation bath having a plastic flow characteristic with shear-thinning behavior wherein the polymer particles are substantially uniformly suspended. The resulting impregnation bath is caused to flow between the adjoining filaments of the multifilamentary fibrous material with a concomitant viscosity reduction which aids in the incorporation of the polymer particles. The concentration of the aqueous medium in the product is controlled to yield a uniform, handleable, drapable, tacky, and highly stable product. Upon the application of heat and pressure the improved product can be transformed into a fiber-reinforced composite article wherein the solid particles form the matrix phase.

Title
Production of improved preimpregnated material comprising a particulate thermoplastic polymer suitable for use in the formation of substantially void-free fiber-reinforced composite article
Application Number
928917
Publication Number
4894105
Application Date
November 4, 1987
Publication Date
January 16, 1990
Inventor
Joel Dyksterhouse
Marathon
FL, US
Robert Dyksterhouse
Marathon
FL, US
Agent
Burns Doane Swecker & Mathis
Assignee
BASF Aktiengesellschaft
DE
IPC
B29C 67/14
C08J 5/00
B29B 15/12
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