Non-black rubber membranes

Patent metadata

Field	Value
Publication number	US-9802391-B2
Application number	US-201615094148-A
Country	US
Kind code	B2
Filing date	Apr 8, 2016
Priority date	Feb 19, 2008
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A roofing membrane comprising an olefinic rubber; and from about 20 to about 250 parts by weight of a silica filler per 100 parts by weight rubber; wherein the silica filler is chemically coupled to the olefinic rubber; and wherein the roofing membrane is non-black.

First claim

What is claimed is:

1. A roofing membrane comprising:
(i) a non-black element including silica dispersed within a crosslinked network of ethylene-propylene-diene rubber, where the silica is chemically coupled to the crosslinked network through a reaction with a coupling agent defined by the formula:

where R 8 is a divalent organic group or a bond, R 9 is a halogen atom or an alkoxy group, and each R 10 is independently a halogen, an alkoxy group, or a monovalent organic group, and where R 11 is a blocking group.

2. The membrane of claim 1 , where the non-black element includes at least 15 and less than 250 parts by weight silica per 100 parts by weight rubber.

3. The membrane of claim 1 , where the non-black element includes at least 20 and less than 200 parts by weight silica per 100 parts by weight rubber.

4. The membrane of claim 1 , where the non-black element further includes titanium dioxide.

5. The membrane of claim 4 , where the non-black element includes at least 20 and less than 90 parts by weight titanium dioxide per 100 parts by weight rubber.

6. The membrane of claim 1 , where the non-black element further includes a processing oil.

7. The membrane of claim 6 , where the non-black element includes at least 30 and less than 120 parts by weight processing oil per 100 parts by weight rubber.

8. The membrane of claim 7 , where the processing oil is a white oil.

9. The membrane of claim 6 , where the processing oil has a sulfur content of less than 0.5 weight percent and an unsaturation level of less than 3%.

10. The membrane of claim 1 , where the coupling agent is a thioester, a thiophosphinate, a thiophosphate, or a thiosulphonate.

Assignees

• Firestone Building Prod Co Llc

Inventors

• Wang Hao
• Davis James A
• Barham Jr William F

Classifications

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• B32B25/042

  of natural rubber or synthetic rubber · CPC title

• B29C43/305

  Making multilayered articles · CPC title

• B32B2307/732

  Dimensional properties · CPC title

• C08K3/36

  Silica · CPC title