Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 17, 2019
Patent Application Number
14323399
Date Filed
July 3, 2014
Patent Citations Received
Patent Primary Examiner
Patent abstract
A method of preparing an EPDM roofing membrane panel, the method comprising preparing a vulcanizable composition including expandable graphite by mixing an EPDM rubber and expandable graphite, forming a sheet from said vulcanizable composition, preparing a green membrane panel using said sheet, and curing said green membrane panel to form the EPDM roofing membrane panel, where said steps of preparing a vulcanizable composition, said step of forming a sheet, said step of preparing a green membrane, an said step of curing each include a peak temperature at which each of said steps respectively take place, and where the expandable graphite has an onset temperature above said peak temperature of each respective step.
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