Initiators for the cationic crosslinking of polymers containing organofunctional groups

A composition comprising:

• (a) a catalytically effective amount of either an onium salt of an element selected from the group consisting of I, S, Se, P and N, or an oxioisothiochromanium salt;
• (b) an accelerator comprising a compound of formula (I) ##STR15## wherein R.sup.1 is selected from the group consisting of:
• a linear or branched C.sub.1 -C.sub.10 alkyl radical, optionally substituted with a linear or branched C.sub.1 -C.sub.4 alkoxy group;
• a C.sub.4 -C.sub.10 cycloalkyl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• a C.sub.5 -C.sub.12 aryl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• an aralkyl or aroxyalkyl radical in which the aryl part of the radical is a C.sub.5 -C.sub.12 group optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups, wherein the alkyl part of the radical is a linear or branched C.sub.1 -C.sub.4 group;
• a linear or branched C.sub.1 -C.sub.15 alkoxy radical;
• and
• a C.sub.4 -C.sub.10 cycloalkyloxy radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• and
• wherein R.sup.2 is selected from the group consisting of:
• a linear or branched C.sub.1 -C.sub.10 alkyl radical, optionally substituted with a linear or branched C.sub.1 -C.sub.4 alkoxy group;
• a C.sub.4 -C.sub.10 cycloalkyl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• a C.sub.5 -C.sub.12 aryl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• and
• an aralkyl or aroxyalkyl radical in which the aryl part is a C.sub.5 -C.sub.12 group optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups, wherein the alkyl part or the radical is a linear or branched C.sub.1 -C.sub.4 group;
• and
• (c) at least one cationically crosslinkable polyorganosiloxane containing epoxide or vinyl ether functional groups.

A process for rendering articles non-adhesive to surfaces to which they would normally adhere, comprising the steps of:

• (a) applying a composition comprising:
• (1) a catalytically effective amount of either an onium salt of an element selected from the group consisting of I, S, Se, P and N, or an oxoisothiochromanium salt;
• (2) an accelerator comprising a compound of formula (I) ##STR17## wherein R.sup.1 is selected from the group consisting of:
• a linear or branched C.sub.1 -C.sub.10 alkyl radical, optionally substituted with a linear or branched C.sub.1 -C.sub.4 alkoxy group;
• a C.sub.4 -C.sub.10 cycloalkyl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• a C.sub.5 -C.sub.12 aryl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• an aralkyl or aroxyalkyl radical in which the aryl part is a C.sub.5 -C.sub.12 group optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups, wherein the alkyl part or the radical is a linear or branched C.sub.1 -C.sub.4 group;
• a linear or branched C.sub.1 -C.sub.15 alkoxy radical;
• and
• a C.sub.4 -C.sub.10 cycloalkyloxy radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• and
• wherein R.sup.2 is selected from the group consisting of:
• a linear or branched C.sub.1 -C.sub.10 alkyl radical, optionally substituted with a linear or branched C.sub.1 -C.sub.4 alkoxy group;
• a C.sub.4 -C.sub.10 cycloalkyl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• a C.sub.5 -C.sub.12 aryl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• and
• an aralkyl or aroxyalkyl radical in which the aryl part is a C.sub.5 -C.sub.12 group optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups, wherein the alkyl part or the radical is a linear or branched C.sub.1 -C.sub.4 group;
• and
• (3) at least one cationically crosslinkable polyorganosiloxane having epoxide or vinyl ether functional groups;
• in an amount of between 0.1 and 500 g per m.sup.2 of a surface of the said article to be coated;
• and
• (b) exposing said surface to photochemical activation, thermal activation or electron beam radiation to cure said polyorganosiloxane onto said surface.

An article of manufacture having coated and cured on one or more of its surfaces a film of a composition comprising:

• (1) a catalytically effective amount of either an onium salt of an element selected from the group consisting of I, S, Se, P and N, or an oxoisothiochromanium salt;
• and
• (2) an accelerator comprising a compound of formula (I) ##STR18## wherein R.sup.1 is selected from the group consisting of:
• a linear or branched C.sub.1 -C.sub.10 alkyl radical, optionally substituted with a linear or branched C.sub.1 -C.sub.4 alkoxy group;
• a C.sub.4 -C.sub.10 cycloalkyl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• a C.sub.5 -C.sub.12 aryl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• an aralkyl or aroxyalkyl radical in which the aryl part is a C.sub.5 -C.sub.12 group optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups,
• wherein the alkyl part or the radical is a linear or branched C.sub.1 -C.sub.4 group;
• a linear or branched C.sub.1 -C.sub.15 alkoxy radical;
• and
• a C.sub.4 -C.sub.10 cycloalkyloxy radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• and
• wherein R.sup.2 is selected from the group consisting of:
• a linear or branched C.sub.1 -C.sub.10 alkyl radical, optionally substituted with a linear or branched C.sub.1 -C.sub.4 alkoxy group;
• a C.sub.4 -C.sub.10 cycloalkyl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• a C.sub.5 -C.sub.12 aryl radical, optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups;
• and
• an aralkyl or aroxyalkyl radical in which the aryl part is a C.sub.5 -C.sub.12 group optionally substituted with one or more linear or branched C.sub.1 -C.sub.4 alkyl or alkoxy groups, wherein the alkyl part or the radical is a linear or branched C.sub.1 -C.sub.4 group;
• and
• (3) at least one cationically crosslinkable polyorganosiloxane containing epoxide or vinyl ether functional groups.