| 主权项 |
1. A thermosetting composition comprising
(a) 50-90 wt % of at least one phosphorous-free bis(dihydrobenzoxazine) of formula (I), wherein each R1 is independently C1-C18 alkyl, C3-C12 cycloalkyl, C3-C12 cycloalkyl which is unsubstituted or substituted with a C1-C4-alkyl, or C6-C18 aryl which is unsubstituted or substituted by one or more C1-C6 alkyl groups or C1-C6 alkoxy groups; each R2 is independently hydrogen, dialkylamino, alkylthio, alkylsulfonyl, C1-C18 alkyl, C1-C18 alkenyl, C1-C18 alkoxy, C1-C18 alkoxy-C1-C18-alkylene, C5-C12 cyclo alkyl which is unsubstituted or substituted by one or more C1-C6 alkyl groups or C1-C6 alkoxy groups, C6-C12 aryl which is unsubstituted or substituted by one or more C1-C6 alkyl groups or C1-C6 alkoxy groups, or C6-C12 aryl-C1-C18-alkylene wherein the aryl moiety is unsubstituted or substituted by one or more C1-C6 alkyl groups or C1-C6 alkoxy groups; X1 is a bivalent bridging group selected from —O—, —S—, —S(O)—, —S(O)2—, —C(O)—, —N(R3)—, —O—C(O)—, —O—C(O)—O—, —S(O)2—O—, —O—S(O)2—O—, C1-C18 alkylene, C2-C18 alkenediyl, C3-C12 cycloalkylene, C5-C12 cycloalkenediyl, —Si(OR3)2— or —Si(R3)2—; and R3 is H, C1-C12 alkyl, C5 or C6 cycloalkyl, C5 or C6 cycloalkyl substituted with methyl, ethyl, or phenyl, benzyl or phenyleth-2-yl; (b) 1-13 wt % of at least one quaternary ammonium salt comprising
i) a cation of an aromatic-N-heterocyclic compound which comprises one or two nitrogen atoms andii) an anion; (c) 1-15 wt % of a thermal radical initiator selected from a pinacol or an ether, ester or silyl derivative thereof; and (d) 15-40 wt % of a compound comprising at least one epoxy group wherein the wt % is based on the entire weight of the thermosetting composition. |
