Back to results
US 8,367,760 B1Granted
Non-black rubber membranes
AssigneeFirestone Building Products Company, LLC
InventorsHao Wang, James A. Davis, William F. Barham, Jr.
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.
Claims22
A roofing membrane comprising:
- a non-black component that includes an olefinic rubber including units deriving from ethylene, α-olefin, and diene monomer, where the olefinic rubber includes at least 1.5 percent by weight and less than 4 percent by weight units deriving from diene monomer;
- at least 20 parts by weight and less than 250 parts by weight of a silica filler per 100 parts by weight rubber;
- at least 20 parts by weight and less than 90 parts by weight titanium dioxide per 100 parts by weight rubber;
- and
- at about 30 parts by weight and less than 120 parts by weight clear oil per 100 parts by weight rubber;
- wherein at least a portion of the silica filler is chemically coupled to the olefinic rubber.
3 more elements
A method for the production of a roofing membrane comprising:
- mixing an olefinic rubber including units deriving from ethylene, α-olefin, and diene monomer, a silica filler, and a hindered organosilane coupling agent to form a mixture, wherein the silica filler reacts with the silane coupling agent;
- adding a curative to the mixture to form an uncured compound;
- calendering the uncured compound to form a sheet;
- assembling the sheet into an uncured roofing membrane;
- and
- curing the uncured roofing membrane, whereby said step of curing couples the silica filler to the olefinic rubber.
3 more elements
A method for preparing a roofing membrane, the method comprising:
- i. combining an olefinic rubber including units deriving from ethylene, α-olefin, and diene monomer, at least 20 parts by weight to less than 250 parts by weight of silica per 100 parts by weight rubber, from at least 0.1 to less than 5 parts by weight of a hindered organosilane coupling agent per 100 parts by weight rubber, and a curative, to thereby produce a non-black vulcanizable composition of matter;
- ii. forming the non-black vulcanizable composition of matter into an uncured non-black sheet;
- iii. subjecting the uncured non-black sheet to cure conditions to thereby form a non-black membrane wherein the olefinic rubber is crosslinked and the silica is chemically linked to the olefinic rubber via the coupling agent.
Dependencies are inferred from the claim text.