Epoxy resin mixtures for prepregs and composites
AssigneeSiemens Aktiengesellschaft
InventorsWolfgang von Gentzkow, Jurgen Huber, Heinrich Kapitza, Wolfgang Rogler
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Abstract
Epoxy resin mixtures for the production of prepregs and composites contain the following components: a phosphorus-modified epoxy resin with an epoxy value of 0.02 to 1 mol/100 g, made up of structural units derived from (a) polyepoxy compounds with at least two epoxy groups per molecule, and (b) phosphinic acid anhydrides, phosphonic acid anhydrides, or phosphonic acid half-esters; an amine-substituted aromatic sulfonic acid amide or hydrazide as a hardener; an amino hardening accelerator.
Claims16
An epoxy resin mixture for the production of prepregs and composites, comprising:
- a phosphorus-modified epoxy resin with an epoxy value of 0.02 to 1 mol/100 g, which is a reaction product of (a) and (b)
- (a) polyepoxy compounds with at least two epoxy groups per molecule, and
- (b) phosphinic acid anhydrides, phosphonic acid anhydrides, or phosphonic acid half-esters;
- an aromatic amine with the following structure as a hardener:
- ##STR2## wherein:
- X is a H atom and Y is an alkyl group with 1 to 3 C atoms and m and n each stand for a whole number from 0 to 4, where m+n=4,
- the radicals R.sup.1 and R.sup.2 are, independent of each other, a H atom or an alkyl group with 1 to 3 C atoms, or one of the radicals R.sup.1 or R.sup.2 has this significance and the other radical is an NR.sup.3 R.sup.4 group with R.sup.3 or R.sup.4 =H or alkyl with 1 to 3 C atoms;
- and
- an amino hardening catalyst.
Dependencies are inferred from the claim text.