Composite membrane for building applications

Patent metadata

Field	Value
Publication number	US-11767673-B2
Application number	US-202017039326-A
Country	US
Kind code	B2
Filing date	Sep 30, 2020
Priority date	Sep 30, 2019
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A roofing composite membrane includes a base layer including a first thermoplastic polyolefin. A weight of the base layer is between 5 and 25 grams per square foot. A coating layer at least partially coats the base layer. The coating layer includes at least one inorganic additive, and a second thermoplastic polyolefin including polypropylene and having a melt flow rate between 0.5 grams per 10 minutes and 12 grams per 10 minutes.

First claim

What is claimed is:

1. A roofing system, comprising:
a steep sloped roof comprising a substrate; and
a roofing composite membrane installed on the substrate,
wherein the roofing composite membrane
is in the form of a sheet,
has a width of at least 2 feet,
is not a shingle, and
is not covered by a shingle,

the roofing composite membrane comprising:
a coating layer comprising:
at least one inorganic additive, and
a first thermoplastic polyolefin comprising polypropylene, wherein the first thermoplastic polyolefin has a melt flow rate between 0.5 grams per 10 minutes and 12 grams per 10 minutes,
wherein the coating layer comprises a top surface and a bottom surface opposite the top surface,
wherein the top surface of the coating layer forms a top surface of the roofing system; and

a base layer comprising a second thermoplastic polyolefin,
wherein the base layer comprise a top surface and a bottom surface opposite the top surface,
wherein the bottom surface of the coating layer at least partially covers the top surface of the base layer; and

an adhesive layer,
wherein the adhesive layer at least partially covers the bottom surface of the base layer.

2. The roofing system of claim 1 , wherein the the coating layer comprises polyethylene.

3. The roofing system of claim 1 , wherein the first thermoplastic polyolefin comprises at least 80 mol % polypropylene.

4. The roofing system of claim 1 , wherein the coating layer has a flexural modulus between 5,000 psi and 175,000 psi.

5. The roofing system of claim 1 , wherein the base layer has a tear strength between 10 lbf and 30 lbf.

6. The roofing system of claim 1 , wherein the at least one inorganic additive comprises CaCO 3 , Mg(OH) 2 , TiO 2 , colorants, fire retardants, or combinations thereof.

7. The roofing system of claim 1 , wherein the base layer comprises a woven or nonwoven fabric.

8. The roofing system of claim 1 , further comprising an adhesive layer in contact with the base layer, wherein the adhesive layer comprises a butyl, styrene, or acrylic hot melt.

9. The roofing system of claim 1 , wherein a combined thickness of the base layer and the coating layer is between 6 mils and 40 mils.

10. The roofing system of claim 1 , wherein a weight of the base layer is between 5 and 25 grams per square foot.

11. The roofing system of claim 1 , wherein the roofing membrane comprises a thin, pliable sheet.

12. The roofing system of claim 1 , wherein the width of the roofing membrane is 2 to 8 feet.

13. The roofing system of claim 1 , wherein the width of the roofing membrane is 2 to 4 feet.

14. The roofing system of claim 1 , wherein the width of the roofing membrane is 2 to 6 feet.

15. The roofing system of claim 1 , wherein the width of the roofing membrane is 4 to 8 feet.

16. The roofing system of claim 1 , wherein the width of the roofing membrane is 4 to 6 feet.

Assignees

• Bmic Llc

Inventors

• Yang Li-Ying
• Avitabile Jeffrey
• Nigro Joseph
• Podewils Daniel
• Davis Brian A
• Anderson Eric R
• Gimpert Matthew
• Zheng Yan
• Duffy Brian E
• Xiao Yixi

Classifications

• E04D5/12 Primary

  specially modified, e.g. perforated, with granulated surface, with attached pads · CPC title

• B29C48/022

  characterised by the choice of material · CPC title

• B29C48/154

  Coating solid articles, i.e. non-hollow articles · CPC title

• B32B3/12

  characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure · CPC title

• B32B5/022

  Non-woven fabric · CPC title