Peel and stick roofing membranes with cured pressure-sensitive adhesives

Patent metadata

Field	Value
Publication number	US-10519663-B2
Application number	US-201816179084-A
Country	US
Kind code	B2
Filing date	Nov 2, 2018
Priority date	Sep 18, 2013
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A membrane composite comprising a polymeric membrane panel, an adhesive layer, and a release member, where the adhesive layer is a pressure-sensitive adhesive that is at least partially cured, and where the adhesive layer has a thickness of at least 102 μm.

First claim

What is claimed is:

1. A process for forming a roofing membrane composite, the process comprising:
heating a melt-extrudable, UV-curable pressure-sensitive adhesive composition to allow the adhesive to flow, where the adhesive composition comprises a polyacrylate elastomer and, optionally, one or more of photoinitiators, solvents, plasticizers, and resins;
applying the adhesive composition to a planar surface of a roofing membrane panel, where the membrane panel is adapted to provide a weatherproof polymeric barrier to a building structure, to thereby form an adhesive layer having a thickness of at least 152 μm;
subjecting the adhesive layer to UV radiation to thereby effect crosslinking of the polyacrylate elastomer to form a cured adhesive layer comprising a cross-linked infinite polymer network;
applying a release member to the cured adhesive layer to form a roofing member composite; and
winding the composite.

2. The process of claim 1 , where said step of heating heats the adhesive composition to a temperature of from about 120 to about 160° C.

3. The process of claim 1 , where said step of subjecting the coating to UV radiation includes subjecting the adhesive layer to a UV dosage of from about 50 to about 230 millijoules/cm2.

4. The process of claim 1 , where said step of subjecting the coating to UV radiation includes subjecting the adhesive layer to at least 150 milliWatts/cm2 of UV energy.

5. The process of claim 1 , where said step of subjecting the coating to UV radiation includes subjecting the adhesive layer to at least 200 milliWatts/cm2 of UV energy.

6. The process of claim 1 , where the polyacrylate elastomer includes one or more units deriving from butyl acrylate or 2-ethylhexyl acrylate.

7. The process of claim 1 , where the polyacrylate elastomer has a Tg of less than 0° C.

8. The process of claim 1 , where the polyacrylate elastomer includes polymerized units that serve as photoinitiators.

9. The process of claim 1 , where the polyacrylate elastomer is characterized by a number average molecular weight of from about 100 to about 350 kg/mol.

10. The process of claim 1 , where the polyacrylate elastomer is characterized by a Brookfield viscosity at 150° C. of from about 20,000 to about 70,000 cps.

11. The process of claim 1 , where the roofing membrane panel is a thermoplastic or cured rubber membrane.

12. The process of claim 1 , where the roofing membrane panel is EPDM.

13. The process of claim 1 , where the roofing membrane panel has a width of from about 1 to about 20 meters.

14. The process of claim 1 , where the roofing membrane panel has a thickness of from about 500 μm to about 3 mm.

15. The process of claim 1 , where the cured adhesive layer is in contact with substantially all of one planar surface of the membrane panel.

16. The process of claim 1 , where the membrane composite is characterized by a peel strength, when adhered to a stainless steel panel and tested according to PSTC 101 , of at least 3.0 psi.

17. The process of claim 1 , where the membrane composite is characterized by a dead load shear, when adhered to a stainless steel panel and tested according to PSTC 107 , of at least 0.5 hour.

Assignees

• Firestone Building Prod Co Llc

Inventors

• Tang Jiansheng
• Hubbard Michael J

Classifications

• B32B2255/26

  Polymeric coating · CPC title

• B32B2307/748

  Releasability · CPC title

• C09J7/243

  Ethylene or propylene polymers · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• C09J7/22

  Plastics; Metallised plastics · CPC title