The use of an adduct of a specified Lewis acid/ligand=Lewis base as a thermal initiator in organosiloxane compositions for use as coatings

摘要

The use of an adduct of a specified Lewis acid/ligand=Lewis base as a thermally activatable polymerization and/or crosslinking initiator of organosiloxane monomers, oligomer and/or polymers The Lewis acid comprises a boron derivative of Formula (I) (A)xB(R')y, (I) R' = 1-12C alkyl or alkenyl optionally substituted by an electroattractor element, such as a halogen, or group, 1-12C alkoxy optionally substituted by an electroattractor element, such as a halogen, or group, phenyl substituted with an electroattractor element, such as a halogen, or group, aryl containing at least two aromatic centers optionally substituted by an electroattractor element, such as a halogen, or group, -C2H4-Si(Q)3; Q = 1-10C alkyl or alkoxy, less than 10Si siloxane oligomer where necessary substituted with B(R')2; A = H, halogen, hydroxyl; x = 0, 1, 2; y = 1, 2, 3; x + y = 3; Two R' may combine to form with the B to which they are attached a 5 - 10 atom saturated, unsaturated, bridged and/or aromatic cycle, possibly comprise one or more heteroatoms H, N or B and the B present in the cycle may be substituted with A or R' , or solvated forms. The ligand=Lewis base comprises one or more atoms chemically available to form a stable adduct with the Lewis acid. Independent claims are included for: (1) a cationically polymerizable and/or crosslinkable composition comprising one or more organosiloxane monomers, oligomers and/or polymers bearing reactive functions required for polymerization and/or crosslinking and the initiator; (2) a resin obtainable from the composition; (3) a polymer obtainable form the composition; (4) A coating based on the resin, which is a varnish, an adhesive coating, an anti- stick coating and/or an ink; (5) an object having at least one surface coated with the resin; (6) a procedure for polymerizing and/or reticulating the composition by exposing it to a source of heat.