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.).

acrylate copolymer adhesive

Silicone elastomer materials in pressure-sensitive adhesives have been prepared by polymerization of silicone compounds with end-alene unsaturated groups using actinic radiation (e.g. ultraviolet radiation) in the presence of conventional Norrish type 1 photoinitiators. Advantageously, the 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.

Some methods involved in active controlled radical polymerization by reversible transformation include the iniferter method, the nitroxide mediated polymerization (NMP) method, the atomic transfer polymerization (ATRP) method, and the reversible addition and 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. , 3, 127-132 (1982) discussed various transfer-inducing terminators. The use of the compound p-xylene bis-(N, n-diethyl dithio-carbamate) (XDC) to form various acrylate-based block copolymers such as those described in European patent applications 0286376 A2(Otsu et al.) and 0349270 A2(Mahfuza et al.).

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