Silicone-based pressure-sensitive adhesive

A method of making a silicone-based pressure-sensitive adhesive comprising a silicone-based elastomeric material and a silicone tackifying resin, the method comprising:

• forming reaction mixture comprising
• a) a silicone compound having at least two ethylenically unsaturated groups;
• b) a photoinitiator of Formula (II)
• wherein
• each R10 is an alkoxy, aryloxy, alkaryloxy, aralkyloxy, alkenoxy, or —N(R13)2;
• R11 is a group of formula —(OR14)p—OR15 or a group of formula —(CO)—X—R16;
• R12 is a hydrogen, alkyl, aryl, aralkyl, alkaryl, a group of formula —(CO)OR17, or a group of formula —(CO)N(R18)2;
• each R13 is an alkyl or two adjacent R13 groups are combined with the nitrogen to which they are both attached to form a first heterocyclic ring having 1 to 3 heteroatoms selected from nitrogen, oxygen, and sulfur, the first heterocyclic ring being saturated or unsaturated and optionally fused to one or more second rings that are carbocyclic or heterocyclic;
• each R14 is an alkylene;
• R15 is an alkyl;
• R16 is hydrogen, alkyl, aryl, aralkyl, or alkaryl;
• R17 is an alkyl, aryl, aralkyl, or alkaryl;
• each R18 is an alkyl, aryl, aralkyl, or alkaryl;
• X is oxy or —NR19—;
• R19 is hydrogen, alkyl, aryl, aralkyl, or alkaryl;
• and
• p is an integer equal to at least 0;
• and
• c) a silicone tackifying resin;
• and
• exposing the reaction mixture to actinic radiation to form the silicon-based elastomeric material.