1823 results about "Synthetic rubber" patented technology

The tufted surface covering includes a base formed from particles of a thermosetting polymer compound mixed with a particle binding agent causing a portion of the particles to bind together to form a self supporting web. The base is tufted with a tufting material. Thermosetting vulcanized natural and / or synthetic rubber compounds are employed. The polymer layer is tufted with a tufting material and heated to a temperature of from about 110° C. to about 220° C. at an elevated pressure of up to two tons per square inch, to cause the particles to bind together at elevated temperature and pressure to anchor and seal the tufts in place. Cross-linking agents and polar polymer containing compounds may be employed as particle binding agents. In another aspect of the invention, a second layer of particles of a thermosetting polymer mixed with a particle binding agent may be joined together with the particles of the first layer at elevated temperature and pressure. A series of spaced apertures extends through the first and second layers to enable free draining of the surface covering. The lower surface of the covering includes spaced indentations to reduce the weight of the covering.

The invention is directed to a trocar adapted to form a seal around a surgical instrument, the trocar comprising a cannula having an axis extending between a proximal end and a distal end; a housing having a proximal wall and forming with the cannula a working channel sized and configured to receive the instrument; a septum seal disposed in the housing and extending transverse to the axis of the cannula across the working channel, the septum seal having a normal state when the instrument is absent from the working channel and a stretched state when the instrument is being withdrawn from the working channel; portions of the proximal wall of the housing defining an orifice sized and configured to receive the instrument into the working channel; and an elastomeric ring-shaped projection extending axially distally between the proximal wall and the septum seal, the ring-shaped projection having an axial length adapted to deform to prevent inversion and binding of the septum seal and the orifice upon withdrawal of the surgical instrument. In particular, the septum seal is prevented from reaching the orifice in the proximal wall of the housing when the instrument is withdrawn. The projection may be bonded, insert-molded, or compressively fitted to the proximal wall of the housing. The projection may be formed of an elastomeric material such as natural or synthetic rubber. The projection may further comprise a plurality of portions or fingers extending axially distally from the proximal wall, each of the extending portions or fingers may further include a living hinge. In another aspect, the ring-shaped projection may be formed on the surface of the septum seal instead of the proximal wall of the housing. That is, the ring-shaped projection may be formed to extend axially proximally from the surface of the septum seal toward the proximal wall of the housing.

By using a vulcanized rubber composition containing a rubber component composed of at least any one of a natural rubber, a modified natural rubber and a synthetic rubber, and chemically modified microfibril cellulose, it is possible to provide a vulcanized rubber composition that is environmentally conscious and that exhibits excellent rupture characteristics and a low energy loss, and a pneumatic tire that is excellent in rolling resistance property, steering stability and durability.