FOAMED ROOFING MATERIALS AND METHODS OF USE

WIPO Patent Application WO2004053251

A3

Improvements in compositions, composites, and methods for construction of weather resistant and insulated roofs are disclosed. The type of roofs to which these improvements apply are typically known as built up roofs. Built up roofs feature a substrate as an inner layer normally adjacent to and attached to the exterior of an unimproved roof surface. This invention is directed to improved foamed resin substrates used in such roof constructions. Alternating layers of hot asphalt and roofing felt are applied to the foam substrate layer. In prior art roofs, the foamed resin substrates could not withstand the direct application of hot molten asphalt to the foam surface which necessitated use of an isolation layer between the foamed resin layer and the first asphalt layer. This invention discloses insulating and weather resistant materials comprising thermally resistant foamed polyester resin to which has been directly applied hot melt sealant in the spreadable molten state at temperatures in the range of about 130 °C to about 260 °C wherein said polyester comprises a thermally resisting amount of branching agent and wherein said application of hot melt sealan is made substantially in the absence of degradation of the foamed polyester resin.

ROTTER GEORGE E
MELQUIST JOHN L
MORLAND ROBERT B
RUBIS DONALD E

PCT/US2003/038232

August 12, 2004

December 02, 2003

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BP CORP NORTH AMERICA INC (US)

B32B5/18; B32B27/36; E04D7/00; E04D11/02; (IPC1-7): C08J9/36; B32B5/18; B32B27/36; E04D11/02; E04D7/00

WO2002099219A1

2002-12-12

US5288764A

1994-02-22

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