Oxidized bitumen application

In building floors: damp-proofing and waterproofing; acid-alkali resistant flooring, conductive flooring; sparkless flooring.

In building/roofing: manufacture of roofing felts, adhesives, primers, damp-proof coating compositions, liquid roof coatings, plastic cements and hot carriage roofing compounds.

Hydro projects: canal lining, embankment, hydraulic structure, dam lining protection and sand stabilization.

Roads: construction and maintenance.

Industrial use: lamination, manufacture of caulking compounds, joint fillers, rubber extenders, battery sealing compounds, cable filling compounds etc.

Oxidized oxidized bitumen are frequently used as a backing material in the manufacture of carpet tiles. The construction of these tiles is fairly complex and may consist of a fibrous, e.g. tufted, primary cloth which has been impregnated with a cured latex to stabilize the tufting, and laminated to a secondary backing cloth using the aforementioned oxidized bitumen.

In this application, severe physical demands are placed on the oxidized bitumen to control stress relaxation in the primary tufting cloth, to maintain and retain critical physical dimensions over a wide range of possible application conditions; to prevent excessive buildup of static electricity which may damage electrical and computer hardware as well as physical discomfort to building occupants; and to maintain physical dimensions under static loading conditions such as would occur when heavy objects are placed on carpet tiles over an extended period of time.

The oxidized bitumen used must also possess characteristics in the molten phase which will allow easy preparation and processing, i.e. a suitable viscosity at application temperatures with maximum thermal stability and minimum dimensional instability when applied to the manufactured product.

It has been proposed in GB-A-2 219 802 A (Vulcanite Ltd.) to incorporate a low density polyethylene into oxidized bitumen for roofing and carpet tile backing purposes.

It has been found that such blends do not fulfill all of the demands placed on a oxidized bitumen used in the context of a carpet tile backing. The static loading and dimensional stability of a carpet tile produced using such a oxidized bitumen would not be commercially acceptable and would fall outside the standard requirements laid down by the carpet tile and floor laminating industry.

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