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US 9,309,674 B2Granted
Non-black rubber membranes
AssigneeFirestone Building Products Company, LLC
InventorsHao Wang, James A. Davis, Willam F. Barham
Life of this patent
Estimating the term…
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.
Claims8
A process for preparing a roofing membrane, the method comprising:
- i. mixing ethylene-propylene-diene rubber, silica, and a coupling agent defined by the formula:
- where R8 is a divalent organic group or a bond, R9 is a halogen atom or an alkoxy group, and each R10 is independently a halogen, an alkoxy group, or a monovalent organic group, and where R11 is a blocking group to form a mixture, where the mixture is devoid of carbon black;
- ii. adding a curative to the mixture to form a vulcanizable rubber composition;
- iii. fabricating the vulcanizable composition into an uncured sheet;
- and
- iv. curing the uncured sheet.
3 more elements
Dependencies are inferred from the claim text.