Pressure-sensitive adhesives including expandable graphite

Patent metadata

Field	Value
Publication number	US-10336887-B2
Application number	US-201715619760-A
Country	US
Kind code	B2
Filing date	Jun 12, 2017
Priority date	Nov 7, 2012
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

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 method of preparing a composite, the method comprising the steps of:
i. providing a polymeric sheet;
ii. applying a pressure-sensitive adhesive having a first and second planar surfaces to the polymeric sheet; and
iii. applying expandable graphite to the second planar surface of the pressure-sensitive adhesive to form a concentrated region of expandable graphite.

2. The method of claim 1 wherein the concentrated region of expandable graphite is discontinuous to thereby allow the pressure-sensitive adhesive to be exposed.

3. The method of claim 1 wherein the first planar surface of the pressure-sensitive adhesive is fixedly attached to the polymeric sheet.

4. The method of claim 1 wherein a release liner is removably attached to the second planar surface of the pressure-sensitive adhesive.

5. The method of claim 4 wherein said concentrated region of expandable graphite is proximate to the release liner relative to the polymeric sheet.

6. The method of claim 1 wherein the first planar surface of the pressure-sensitive adhesive is substantially devoid of expandable graphite.

7. The method of claim 1 wherein the concentrated region of expandable graphite has a thickness of from about 10 μm to about 3 mm.

8. The method of claim 1 wherein the polymeric sheet includes a thermoplastic sheet.

9. The method of claim 1 wherein the polymeric sheet includes a thermoset sheet.

10. The method of claim 1 wherein the concentrated region of expandable graphite is formed to by dropping expandable graphite on to the second planar surface of the pressure-sensitive adhesive.

11. The method of claim 10 wherein the expandable graphite is at least partially embedded within the pressure-sensitive adhesive.

12. The method of claim 11 , where the concentrated region of expandable graphite is partially dispersed within said pressure-sensitive adhesive to form a concentration gradient whereby the concentration of the expandable graphite within the pressure-sensitive adhesive moves from a region of maximum concentration proximate to the second planar surface of the pressure-sensitive adhesive to a region of minimum concentration at the first planar surface of the 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