Roofing membranes with expandable graphite as flame retardant

Patent metadata

Field	Value
Publication number	US-2017191271-A1
Application number	US-201715466306-A
Country	US
Kind code	A1
Filing date	Mar 22, 2017
Priority date	Dec 29, 2011
Publication date	Jul 6, 2017
Grant date	—

Abstract

A roofing membrane comprising at least one layer of a cured rubber and expandable graphite dispersed within the cured rubber.

First claim

What is claimed is:

1 . A roofing membrane comprising:
a first layer including about 20 to about 50% by weight cured ethylene-propylene-diene rubber and at least 2 parts by weight expandable graphite, where the parts by weight is based upon 100 parts by weight of the cured ethylene-propylene-diene rubber; a second layer including cured ethylene-propylene-diene rubber, where said second layer is substantially devoid of the expandable graphite; and wherein said first layer is black in color.

2 . The roofing membrane of claim 1 , wherein said second layer is non-black in color.

3 . The roofing membrane of claim 2 , wherein said second layer is white in color.

4 . The roofing membrane of claim 3 , wherein said second layer includes non-black fillers selected from the group consisting of silica, titanium dioxide, clay, and combination thereof.

5 . The roofing membrane of claim 4 , wherein said second layer includes silica as the non-black filler.

6 . The roofing membrane of claim 4 , wherein said second layer includes titanium dioxide as the non-black filler

7 . The roofing membrane of claim 2 , wherein the expandable graphite has an onset temperature of at least 160° C.

8 . The membrane of claim 2 , where said expandable graphite has an onset temperature of at least 170° C.

9 . The membrane of claim 2 , where the ethylene-propylene-diene rubber is cured with a peroxide cure system.

10 . The membrane of claim 2 , where the ethylene-propylene-diene rubber is cured with a quinone cure system.

11 . The roofing membrane of claim 2 , where the first layer includes from about 3 to about 35 parts by weight expandable graphite per 100 parts by weight of the cured ethylene-propylene-diene rubber.

12 . The roofing membrane of claim 2 , where the first layer includes from about 5 to about 30 parts by weight expandable graphite per 100 parts by weight of the cured ethylene-propylene-diene rubber.

13 . The roofing membrane of claim 2 , where the first layer includes from about 7 to about 25 parts by weight expandable graphite per 100 parts by weight of the cured ethylene-propylene-diene rubber.

14 . The roofing membrane of claim 2 , where the expandable graphite is optionally only partially expanded.

15 . The roofing membrane of claim 2 , where the expandable graphite is optionally expanded to at most 50% beyond its original unexpanded size.

16 . The roofing membrane of claim 2 , where the expandable graphite is optionally expanded to at most 20% beyond its original unexpanded size.

17 . The roofing membrane of claim 2 , where the expandable graphite is optionally expanded to at most 10% beyond its original unexpanded size.

18 . The roofing membrane of claim 2 , wherein said first layer includes from about 70 to about 100 parts by weight carbon black, from about 78 to about 103 parts by weight clay, from about 55 to about 95 parts by weight extender, where the parts by weight are based upon 100 parts by weight of the cured ethylene-propylene-diene rubber.

19 . The roofing membrane of claim 18 , where the carbon black, clay, extender, and expandable graphite are dispersed throughout a crosslinked network of the cured ethylene-propylene-diene rubber.

20 . The roofing membrane of claim 19 , where the first layer further includes from about 5 to about 60 parts by weight talc per 100 parts by weight of the cured ethylene-propylene-diene rubber.

Assignees

• Firestone Building Prod Co Llc

Inventors

• Wang Hao
• Zhou Wensheng
• Carr Joseph

Classifications

• B32B2264/12

  Mixture of at least two particles made of different materials · CPC title

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• B32B2250/248

  All polymers belonging to those covered by group B32B25/00 · CPC title

• B32B2250/02

  2 layers · CPC title

• E04B1/94

  against fire ({fire protection of partitions E04B2/7403, E04B2/7409; supporting constructions for ceilings having the capability of expansion in case of fire E04B9/08}; fire-fighting A62C, {e.g. fire prevention or containment A62C2/00}; impregnation of wood or similar materials B27K; {fireproof paints C09D5/18; fireproofing materials C09K21/00; flame-resistant papers D21H5/0002; coverings or linings, e.g. for walls or ceilings, in general E04F13/00}; fireproof doors E06B5/16; {firebreak devices for pipes or the like passing through walls F16L5/04; protection of pipes by means of non-inflammable material F16L57/04}) · CPC title