Method of making thermally curable wet-impregnated rovings

Details Method of making thermally curable wet-impregnated rovings Method of making thermally curable wet-impregnated rovings

1981-02-10

1985-10-01

Lawrence, Evan K.

Textiles: spinning, twisting, and twining

Apparatus and processes

With coating or impregnating

57297, 427178, 427369, 4274346, D06M 1570, B05D 312

Patent

active

045437777

ABSTRACT:
Thermally curable wet-impregnated rovings are disclosed in which the fibers of the roving are impregnated with a liquid polyepoxide having dispersed therein a latent heat-activatable epoxy curing catalyst, such as dicyandiamide, the polyepoxide dispersion having 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 by passing a dry multifillament roving through an elevated temperature bath of the polyepoxide dispersion, this elevated temperature being insufficient to activate the curing catalyst and functioning to lower the viscosity to enable uniform impregnation. The wet rovings are stored in a supply package.

REFERENCES:
patent: 3384505 (1968-05-01), Palmer et al.
patent: 4147253 (1979-04-01), Brook et al.
patent: 4224541 (1980-09-01), Smith et al.

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