Patent ID: 8852382

Claim:
A thermosetting composition consisting of: (a) 97 to 75 percent by weight of at least one bis(dihydrobenzoxazine) prepared by the reaction of an unsubstituted or substituted bisphenol with at least one unsubstituted position ortho to each hydroxyl group, formaldehyde and a primary amine; and (b) 3 to 25 percent by weight of at least one bisphenol selected from hydrochinone, resorcinol, catechol and a bisphenol of formula II, wherein R 4 is hydrogen, dialkylamino; alkylthio; alkylsulfonyl; C 1 -C 18 alkyl; C 1 -C 18 alkoxy; C 1 -C 18 alkoxyalkyl; C 5 -C 12 cycloalkyl that is unsubstituted or substituted by one or more C 1 -C 6 alkyl groups or C 1 -C 6 alkoxy groups; C 6 -C 12 aryl that is unsubstituted or substituted by one or more C 1 -C 6 alkyl groups or C 1 -C 6 alkoxy groups; or C 7 -C 13 aralkyl that is unsubstituted or substituted by one or more C 1 -C 6 alkyl groups or C 1 -C 6 alkoxy groups; X 2 is a direct bond or a bivalent bridging group selected from —O—, —S—, —S(O)—, —S(O) 2 —, —C(O)—, —NR 3 —, —O—C(O)—, —O—C(O)—O—, —SO 2 —O—, —O—SO 2 —O—, —NR 3 —C(O)—, —NR 3 —C(O)—O—, —NR 3 —C(O)—NR 3 —, —NR 3 SO 2 —, —NR 3 —SO 2 —O—, —O—SO 2 NR 3 —, —NR 3 SO 2 —NR 3 —, —P(O)(OR 3 )O—, —OP(OR 3 )O—, —(O)P(OR 3 )—, —P(OR 3 )—, —P(R 3 )—, —O—(O)P(R 3 )—O—, C 2 -C 18 alkyliden, C 3 -C 12 cycloalkyliden, —Si(OR 3 ) 2 — and —Si(R 3 ) 2 —; and R 3 is H or C 1 -C 12 alkyl, C 5 - or C 6 -cycloalkyl, C 5 - or C 6 -cycloalkyl-methyl or -ethyl, phenyl, benzyl or 1-phenyleth-2-yl (c) 0.01 to 3 percent by weight of a proton acid curing catalyst selected from an aliphatic monocarboxylic acid, an aromatic monocarboxylic acid, an aliphatic sulfonic acid, an aromatic sulfonic acid, an aliphatic phosphonic acid an aromatic phosphoric acid and a mixture thereof; and optionally (d) at least one of an aromatic amine, a solvent or an additive selected from reinforcement fibers, synthetic fibers, natural fibers, staple fibers, threads, fabrics, mats, plasticizers, mineral fillers, pigments, dyestuffs, micro hollow spheres, metal powders, flame retardants, defoaming agents, slip agents, thixotropes, adhesion promoters, mould release agents and a mixture thereof.