Preparation of prepregs from cellulosic fibers using water-borne

Details Preparation of prepregs from cellulosic fibers using water-borne Preparation of prepregs from cellulosic fibers using water-borne

1983-03-28

1984-04-03

Page, Thurman K.

Coating processes

Electrical product produced

Welding electrode

1562755, 1563074, 427381, 427382, B05D 306, B05D 302

Patent

active

044408021

ABSTRACT:
Heat-curable prepregs are made by impregnating cellulosic fibers with a water-borne composition containing (a) a photopolymerizable resin of specified structure and (b) an epoxide resin, preferably together with a sensitizer for (a) and a heat-hardening agent for (b). Component (a) contains both hydrophobic and hydrophilic units and serves to keep the hydrophobic epoxide resin (b) suspended in the aqueous composition during impregnation, it then solidifying on exposure to actinic radiation. Subsequently the prepregs are heated to cure (b).
Component (a) is a di(meth)acrylate containing groups of formula ##STR1## where each R.sup.19 denotes alkyl or each pair of R.sup.19 denotes --CH.sub.2 --.sub.2, --C(R.sup.21 R.sup.22)CO--, --CH.sub.2 CH(CH.sub.3)--, --CH.sub.2 --.sub.3, or --CO--.sub.2,

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Derwent, 44508 D/25, EP 30,213.
Derwent, 52728 B/29, DT 2,800,356.

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