Thermally curable wet-impregnated rovings

Details Thermally curable wet-impregnated rovings Thermally curable wet-impregnated rovings

1984-02-09

1985-07-30

Lawrence, Evan K.

Textiles: spinning, twisting, and twining

Strand structure

Multifilament yarns

57257, 428367, 428375, 428377, 428378, 428392, D02G 340

Patent

active

045313547

ABSTRACT:
Thermally curable wet-impregnated rovings in which the fibers of the roving are impregnated with liquid polyepoxides lacking polymerizable unsaturation and having dispersed therein a latent heat-activatable epoxy curing catalyst, such as dicyandiamide. The polyepoxide dispersion has a room temperature viscosity of from 2000 to 5000 centipoises and a tack of less than about 6 on a Thwing-Albert inkometer. The rovings are produced without organic solvent using an elevated temperature which is insufficient to activate the curing catalyst and which lowers the viscosity to enable uniform impregnation in the absence of excess impregnant. The wet rovings can be stored without running in a supply package which may be cop wound, and running is also resisted in a void-free wet fiber composite so that the wet composite can be wrapped and then heated to cure the same.

REFERENCES:
patent: 3384505 (1968-05-01), Palmer et al.
patent: 3914504 (1975-10-01), Weldy
patent: 4147253 (1979-04-01), Brook et al.
patent: 4224541 (1980-09-01), Smith et al.
patent: 4230766 (1980-10-01), Gaussens et al.

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