EPDM roofing membranes with expandable graphite as flame retardant
US10415249B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2014 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | Nov 25, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2201/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.