Encapsulation of thermoplastic particles for production of compo

Details Encapsulation of thermoplastic particles for production of compo Encapsulation of thermoplastic particles for production of compo

1991-03-12

1993-09-28

Kight, III, John

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428245, 428368, 428408, 428412, 4284228, 428413, 4284735, 428501, 428524, 428364, 427222, 156242, 15624423, 15624427, 1563073, 264136, 264137, 264257, 264258, 26433111, 26433118, 525 57, 525 58, 525153, 5254205, 525461, 525471, 526202, 528480, C08F 624

Patent

active

052485501

ABSTRACT:
Gel coating of thermoplastic particles, such as polyimide particles, with a polyketone or polyvinyl alcohol gel, and applying the gel coated particles to reinforcement, e.g. carbon, fibers to form a pre-preg. Such gel coated thermoplastic particles can be mixed with a thermosetting resin to form a pre-preg, which can be cured at elevated temperatures to form a composite having damage tolerance characteristics. The gel coating is applied to the thermoplastic particles by contacting such particles with a polymerizable material such as acetone in a weakly acidic solution to cause the acetone to undergo tautomerism, and in the presence of a polymerization promoter or catalyst, preferably certain anionic surfactants such as sulfated ammonium salts, to convert the tautomer to polyacetone gel of low molecular weight, which coats or encapsulates the thermoplastic particles.

REFERENCES:
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patent: 4919739 (1990-04-01), Dyksterhouse et al.
patent: 4943472 (1990-07-01), Dyksterhouse et al.
patent: 4954195 (1990-09-01), Turpin
patent: 5128198 (1992-07-01), Dyksterhouse et al.
patent: 5147722 (1992-09-01), Koslow
N. L. Allinger et al; Organic Chemistry; 1971; p. 478.

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