Silicone pressure sensitive adhesive

Pressure-sensitive adhesives are prepared by combining silicone elastomer materials with viscosifying resins, including silicone viscosifying resins.

Such as US patents 5,237,082(Leir et al.),5,264,278(Mazurek et al.),5,264,278(Mazurek et al.),5,314,748(Mazurek et al.), and 5,514 ,730(Mazurek et al.). Silicone elastomer materials in pressure-sensitive adhesives have been prepared by polymerizing silicone compounds with end-alene unsaturated groups using actinic radiation (e.g., ultraviolet radiation) in the presence of a conventional Norrish type 1 photoinitiator.

Advantageously, polymerization can occur in the absence of an organic solvent and/or in the presence of a thermal material such as a thermal substrate. Active controlled radical polymerization methods have been developed that allow the preparation of polymers with well-defined molecular weight, polydispersity, topology, composition, and microstructure.

These methods are based on the use of special polymerization media that temporarily and reversibly convert growing radicals into dormant and/or stable species. Reversible transformation is usually achieved by reversible inactivation or by reversible chain transfer.

Involves living controlled radical polymerization by reversible conversion of some methods including the cause transfer termination agent (inverter) method, the nitrogen-oxygen free radicals (nitroxide mediated polymerization (NMP), atom transfer polymerization (ATRP), and reversible addition-fracture (RAFT) method. The terms “initiated transfer terminator” and “photoinitiated transfer terminator” refer to molecules that may act as initiators, transfer agents, and terminators. In Otsu et al., Macromol.Chem., Rapid Commun. , 3127-132 (1982), discusses the various causes of termination agents. Compounds to double xylene (N, N-diethyl dithiocarbamate ester) (XDC) is used to form a variety of block copolymer based on acrylic acids, such as European patent application 0286376 A2 (such as Otsu) and 0349270 A2 (Mahfuza et al) in those described.