Silicone resins are highly branched, 3-D framework polymers that consist of randomly ordered, mainly trifunctional units. As a class of products, silicone resins range from being relatively low molecular reactive resins to high molecular materials with very diverse structures. All of them, however, are highly crosslinked.

Crosslinking is generally carried out at elevated temperatures over a long period of time, during which a temporary thermoplastic phase occurs. Silicone resins and their low molecular precursors are the basis of silicone masonry protection agents, such as binders for silicone resin emulsion paints for facades.

Basic structure of silicone resins

» Properties

The ability of silicone resins to combine with many organic polymers allows such properties as curing characteristics, flexibility, adhesion and weathering resistance to be optimised at will. They have outstanding thermostability, being able to withstand continuous high temperatures of 200 to 250°C and intermittent temperatures of up to 600°C. They also have ideal dielectric properties. Excellent resistance to oxidation and good mechanical properties render them highly durable, economical materials.

» Typical Applications

The properties of silicone resins make them suited for use as binders in paints, varnishes, and impregnating products. They are also used as intermediate products in association with other organic compounds e.g. to prepare blender polyester-silicone.