Prepregs, towpregs and preforms

Details Prepregs, towpregs and preforms Prepregs, towpregs and preforms

2009-08-18

2011-10-04

Nutter, Nathan M (Department: 1765)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Noninterengaged fiber-containing paper-free web or sheet...

C428S297100, C264S258000

Reexamination Certificate

active

08029889

ABSTRACT:
The present invention relates to prepregs, towpregs and preforms made from curable compositions of (a) benzoxazines, (b) a combination of adducts a first of which is prepared from hydroxy-containing compounds, isocyanate-containing compounds and phenolic compounds and the second of which is prepared from the first adduct and epoxy-containing compounds, (c) components reactive with the benzoxazine, such as epoxy resins, episulfide resins and oxetane resins, (d) tougheners, such as polyether sulfones, ATBN and core shell materials and (e) a silica component, where the silica has a mean particle diameter on the order of 10−9meters.

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