Cooper-Standard has been granted a patent for a roofing membrane and its manufacturing method. The membrane consists of a top layer and a bottom layer, both containing a flame retardant and a silane-crosslinked polyolefin elastomer with a density less than 0.90 g/cm3. The compression set of the layers is between 5.0% and 35.0%. The gel content of the membrane is over 60%, and the polyolefin elastomers used have a glass transition temperature between -75°C and -25°C. GlobalData’s report on Cooper-Standard gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Cooper-Standard, expandable microsphere foams was a key innovation area identified from patents. Cooper-Standard's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Roofing membrane with flame retardant and silane-crosslinked polyolefin elastomer
A recently granted patent (Publication Number: US11684115B2) describes a roofing membrane with specific characteristics. The membrane consists of multiple layers, including a top layer, an optional scrim layer, and a bottom layer. The top and bottom layers are made of flame retardant materials and silane-crosslinked polyolefin elastomers with a density less than 1.45 g/cm3. The gel content of the roofing membrane is greater than 60%. The polyolefin elastomers used in the membrane are either a propylene/C3-C20 a-olefin copolymer or a blend of propylene/a-olefin copolymer with an ethylene/a-olefin copolymer, both of which are silane-grafted. The glass transition temperature of the elastomers ranges from about -75°C to about -25°C.
In another embodiment, the roofing membrane includes a scrim layer between the top and bottom layers. The gel content of this membrane is also greater than 60%. The silane-crosslinked polyolefin elastomers used in this embodiment are prepared by extruding a first polyolefin with a density less than 0.86 g/cm3, a second polyolefin, a silane crosslinker, a grafting initiator, and a condensation catalyst. The first and second polyolefins can be either a propylene/C3-C20 a-olefin copolymer or a blend of propylene/a-olefin copolymer with an ethylene/a-olefin copolymer, both of which are silane-grafted. The glass transition temperature of the elastomers in this embodiment also ranges from about -75°C to about -25°C.
The patent also mentions that the flame retardant used in the roofing membrane can be magnesium hydroxide and/or aluminum hydroxide, ranging from 20% to 70% by weight. The silane-crosslinked polyolefin elastomers in both embodiments exhibit a crystallinity of 5% to 25%. The density of the roofing membrane can range from 0.85 g/cm3 to 1.45 g/cm3. The first polyolefin in the second embodiment is an ethylene/a-olefin copolymer, ranging from 60% to 97% by weight. The silane crosslinker used in both embodiments is vinyltrimethoxy silane, ranging from 1% to 4% by weight. The condensation catalyst used in both embodiments is a sulfonic ester, ranging from 1% to 4% by weight. The gel content of the roofing membrane can range from 60% to 95%.
Overall, this patent describes roofing membranes with specific compositions and characteristics, including flame retardancy, density, gel content, and polyolefin elastomer properties. These membranes can potentially offer improved performance and durability in roofing applications.