**4. Concluding remarks**

Although carbofunctional silanes and polysiloxanes are known about 40 years they are still often used, and in a literature continually appear new examples of their applications for the modification of properties of polymers and other materials. The CFS have found many different applications for a preparation of polyurethane coating materials, having very good and useful properties. Bis-(3-triethoxysilyl)propyltetrasulphide) is used for the modification of natural and synthetic rubber (Sombatsompop et al., 2007), other CFS are applied for the preparation of silica in elastomers (*in situ*), and for the modification of calcium carbonate, which is used as the filler for elastomers (Zaborski, 2003).

An interest of research centers concerning the CFS and CFPS is still growing and broadens a scale of their numerous applications for modification of polymers. They have a great technological meaning. So far the carbofunctional silanes and polysiloxanes have found many practical applications: these first – mainly as adhesion promoters, polymer modifiers, and crosslinking agents for polyolefins, these latter - in the synthesis of different siliconeorganic copolymers with very profitable properties. Perspectives of their further applications seem to be very promising, and especially for the modification of properties of different organic polymers, not only thermoplastics, but also elastomers, chemically hardenable polymers and thermosetting plastics. The carbofunctional silanes are more often used in practice than CFPS. A main barrier in applications of carbofunctional polysiloxanes on a bigger scale is a high cost of their production. However the chemical modification of polymers with CFPS has a very profitable influence on properties of the modified polymers.

In this Chapter we have been able to describe only a part of results concerning applications of silanes, siloxanes and silicate modified thermoplastic polymers.
