Method for producing release liners
The invention relates to a method for producing a release liner which comprises at least one crosslinked silicon coating based on addition crosslinking silicone polysiloxanes and hydrosilylation catalysts, the silicon coating being treated with compounds that are effective as catalyst poisons for hydrosilylation catalysts. The invention further relates to a release liner which can be obtained according to said method and to the use of compounds that are effective as catalyst poisons for hydrosilylation catalysts for treating a silicon coating present on a release liner to control the release forces with which the release liner can be released from a pressure-sensitive adhesive composition that has been coated onto it.
1. A process for producing a release liner for a pressure-sensitive adhesive, said release liner comprising at least one crosslinked silicone coating based on an addition-crosslinking polysiloxane, and also a hydrosilylation catalyst, said process comprising: before applying said pressure-sensitive adhesive to said release liner, treating the silicone coating with a composition comprising (A) a compound that acts as a contact poison for the hydrosilylation catalyst and (B) an additional substance, wherein said treating comprises applying the composition to the silicone coating by wiping, spraying, printing, rolling, or from the gas phase, or in the form of an aerosol.
2. The process as claimed in claim 1 , wherein
the hydrosilylation catalyst is platinum, a platinum-complex compound or a platinum compound.
3. The process as claimed in claim 1 , wherein the contact poisons are sulfur-, nitrogen-, and/or phosphorus-containing compounds.
4. The process as claimed in claim 1 , which further comprises applying a pressure-sensitive adhesive layer to the silicone coating after said treating.
5. The process according to claim 1 , which further comprises laminating the release liner onto a pressure-sensitive adhesive layer after said treating.
6. A release liner obtained by a process as claimed in claim 1 .
7. The process as claimed in claim 1 , wherein the additional substance is a carrier gas or a solvent.
8. Method for regulating the peel forces required to peel a release liner comprising a silicone coating from a pressure-sensitive adhesive coated onto the liner, said silicone coating comprising a hydrosilylation catalyst, said method comprising prior to coating the pressure-sensitive adhesive onto the liner treating the silicone coating with a composition comprising (A) one or more compounds which act as contact poisons for hydrosilylation catalysts and (B) an additional substance, wherein said treating comprises applying the composition to the silicone coating by wiping, spraying, printing, rolling, or from the gas phase, or in the form of an aerosol.
9. Method for regulating the peel forces required to peel a release liner comprising a silicone coating from a pressure-sensitive adhesive coated or laminated onto the liner, said silicone coating comprising a platinum-containing catalyst, said method comprising prior to coating or laminating the pressure-sensitive adhesive onto the liner treating the silicone coating with a composition comprising (A) one or more compounds which act as contact poisons for platinum-containing catalysts and (B) an additional substance, wherein said treating comprises applying the composition to the silicone coating by wiping, spraying, printing, rolling, or from the gas phase, or in the form of an aerosol.