Pressure-sensitive adhesives including expandable graphite

Patent metadata

Field	Value
Publication number	US-9683135-B2
Application number	US-201314441286-A
Country	US
Kind code	B2
Filing date	Nov 7, 2013
Priority date	Nov 7, 2012
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A building material comprising a substrate layer and a pressure-sensitive adhesive layer, where the pressure-sensitive adhesive layer includes expandable graphite.

First claim

What is claimed is:

1. A building material comprising:
(i) a polymeric sheet having first and second opposed planar surfaces;
(ii) a pressure-sensitive adhesive layer disposed on the second planar surface of the polymeric sheet thereby forming an interface where the adhesive layer contacts the second planar surface of the polymeric sheet;
(iii) a concentrated region of expandable graphite proximate to the interface; and
(iv) a release liner, where the pressure-sensitive adhesive layer includes first and second planar surfaces, where the first planar surface of the pressure-sensitive adhesive layer is fixedly attached to the polymeric sheet, and where the release liner is removably attached to the second planar surface of the pressure-sensitive adhesive layer.

2. The building material of claim 1 , where the building material is a moisture barrier.

3. The building material of claim 1 , where the building material is a roofing underlayment.

4. The building material of claim 1 , where the pressure-sensitive adhesive layer includes a polystyrene block copolymer.

5. The building material of claim 1 , where the pressure-sensitive adhesive layer includes butyl rubber.

6. The building material of claim 1 , where the concentrated region of expandable graphite is formed by applying the expandable graphite onto the first planar surface of the pressure-sensitive adhesive layer, the then pressure-sensitive adhesive layer is mated to the polymeric sheet to thereby locate the expandable graphite proximate to the interface formed by joining the polymeric sheet to the first planar surface of the pressure-sensitive adhesive layer.

7. The building material of claim 1 , wherein the concentrated region of expandable graphite may be partially dispersed within said pressure-sensitive adhesive layer to form a concentration gradient whereby the concentration of the expandable graphite within the pressure-sensitive adhesive layer moves from a region of maximum concentration proximate to the first planar surface of the of the adhesive layer to a region of minimum concentration at the second planar surface of the adhesive layer.

8. The building material of claim 1 , where the expandable graphite has an onset temperature of at least 160° C.

9. The building material of claim 8 , where the pressure-sensitive adhesive is an extrudable pressure-sensitive adhesive.

Assignees

• Firestone Building Prod Co Llc

Inventors

• Zhou Wensheng
• Hubbard Michael J
• Carr Joseph

Classifications

• Y10T442/2648

  Coating or impregnation is specified as an intumescent material · CPC title

• Y10T428/30

  Self-sustaining carbon mass or layer with impregnant or other layer · CPC title

• Y10T428/2883

  including addition polymer of diene monomer [e.g., SBR, SIS, etc.] · CPC title

• Y10T428/2878

  including addition polymer from unsaturated monomer · CPC title

• Y10T428/2848

  Three or more layers · CPC title