| 摘要 |
Cationically curable compositions comprise: A (i) phenols and phenoxy silyl ethers of the formula I wherein Ra and Rb (which may be the same or different) are H or an ortho, para directing activating group for aromatic electrophilic substitution, other than an amine; provided that Ra and Rb are not both H; X is hydroxy or wherein R1 and R2 are H, hydrocarbyl having 1-5 carbon atoms, or aryl R3 is H, hydrocarbyl, aryl, hydrocarbylaryl or a halogen-substituted derivative thereof; A (ii) phenol ethers of the formula II III IV wherein R4, R5 and R6 which may be the same or different are hydrocarbyl, aryl, hydrocarbylaryl, or a substituted derivative thereof; A (iii) ethers of hydroquinone of the formula V wherein R4 and R5 are as defined above; A (iv) substituted phenol ethers of the formula VI VII VIII wherein R4 and R5 are as defined above and R7 is -C(O)-NH-R8-NH-C(O)- or -C(O)-R8-C(O)-wherein R8 is a divalent aliphatic, cycloaliphatic or aromatic group; A (v) phenolic compounds of the formula IX wherein Ra and X are as defined herein Ra is an n-valent radical and 2 ? n ? 4 a compound B selected from B (i) formaldehyde; and compounds capable of producing formaldehyde in the presence of an acid; B (ii) monofunctional aldehydes other than formaldehyde; and compounds capable of producing such aldehydes in the presence of acid B (iii) multi-functional aldehydes; and compounds capable of producing such aldehydes in the presence of acid; a compound C which is a latent acid catalyst, activatable by radiation, heat or moisture. The compositions can be stored and applied (for example in coatings, sealants and adhesives) in the liquid condition, and then cured directly to a solid condition. |
