Coal Industry (patents) Limited

Robert James Pragnell

Newton John Hodges

Geoffrey Vincent Blunt

John P Sheppard

Rodney Taylor

Gregory R Cooper

A roofing method comprises applying to a roof deck a self-adhesive sheet comprising an adhesive and waterproofing layer of bituminous compound so that the sheet adheres to the deck over an area of 10-50% of the total sheet area and water vapor passing through the deck may escape laterally; rendering the upper surface of the sheet adhesive, for example by torching; optionally applying insulation board and a further self-adhesive sheet, and applying a final waterproofing sheet. The use of hot bitumen is completely avoided, the formation of waterproof and insulated roofs is simplified and economies are offered.

Method of forming a waterproof roof

An insulating board of excellent properties is made from a core of foamed phenol-formaldehyde resin which has a closed cell content of at least 85%, laminated on at least one face using a water-based natural rubber latex adhesive with a glass fibre tissue or cloth. The laminate has good fire resistance and can be bonded to roofs etc. using hot bitumen.

Laminated insulating board

A cellular material may be made by vulcanizing a mixture containing between 15% and 50% of an ebonite-forming rubber and sufficient vulcanizing agents to form an ebonite with the rubber, between 5% and 87% of a coal digested in pitch, tar or tar oil, between 10% and 40% of a particulate filler and a chemical blowing agent, whereby an ebonite structure is formed, so that, during the vulcanization, the chemical blowing agent decomposes or reacts to produce a gas, the viscosity of the composition during the production of the gas increasing whereby cells are retained in the composition. The digested coal has a penetration, converted to a Ring and Ball softening point of 85.degree. C, of between 10 and about 45. Cellular plastics material produced by this process may contain at least 25% by volume of closed cells.

Cellular material

The invention comprises the production of a cellular material by vulcanizing a mixture containing between 10% and 90% of an ebonite-forming rubber and sufficient vulcanizing agents to form an ebonite with the rubber, not more than 10% of a solid filler preferably in the absence of such filler, and a chemical blowing agent, whereby an ebonite structure is formed, so that, during the vulcanization, the chemical blowing agent decomposes or reacts to produce a gas, the viscosity of the composition during the production of the gas increasing whereby cells are retained in the composition wherein the mixture further contains between 5% and 87% of a bituminous material.

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Cheltenham, United Kingdom

Robert James Pragnell