Extrudable pressure sensitive adhesive composition and methods for preparing the same

Patent metadata

Field	Value
Publication number	US-9914856-B2
Application number	US-201514729280-A
Country	US
Kind code	B2
Filing date	Jun 3, 2015
Priority date	Apr 29, 2010
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A phase-separated polymeric composition comprising a first phase including polyurethane domains; and a second phase including a butyl rubber matrix.

First claim

What is claimed is:

1. A method for preparing a polymeric composition, the method comprising:
combining ingredients including halogenated butyl rubber, a first phenolic resin having a plurality of hydroxyl groups, and optionally a second phenolic resin having a plurality of hydroxyl groups, in a reaction extruder, to form a blend;
mixing the blend in the extruder, whereupon the halogenated butyl rubber, in the presence of a metal oxide catalyst, becomes a partially crosslinked butyl rubber within the blend;
adding to the blend at least one diisocyanate and, optionally, one or more additives selected from the group consisting of polyurethane catalysts, oils, and tackifier resins; and mixing to allow the diisocyanate to react with at least a portion of the hydroxyl groups of the first phenolic resin and optional second phenolic resin to form polyurethane polymer domains dispersed within the partially crosslinked butyl rubber, wherein said polyurethane polymer is phase-separated from said butyl rubber at standard pressure and temperature.

2. A method for preparing a polymeric composition, the method comprising:
combining halogenated butyl rubber, a first phenolic resin having a plurality of hydroxyl groups, and optionally a second phenolic resin having a plurality of hydroxyl groups, to form a crosslinkable blend;
mixing the crosslinkable blend, in the presence of a metal oxide catalyst, at a temperature of from about 82.2° C. to about 132° C., to form a partially crosslinked butyl rubber within the blend;
adding to the blend at least one diisocyanate and, optionally, one or more additives selected from the group consisting of polyurethane catalysts, oils, and tackifier resins; and
mixing to allow the diisocyanate to react with at least a portion of the hydroxyl groups of the first phenolic resin and optional second phenolic resin to form polyurethane polymer domains dispersed within the partially crosslinked butyl rubber, wherein said polyurethane polymer is phase-separated from said butyl rubber at standard pressure and temperature.

3. The method of claim 1 , where said polyurethane is cocontinuous with said butyl rubber at temperatures above 120° C.

Assignees

• Firestone Building Prod Co Llc

Inventors

• Fieldhouse John
• Tang Jiansheng

Classifications

• C08G2170/40

  Compositions for pressure-sensitive adhesives · CPC title

• C08J2475/04

  Polyurethanes · CPC title

• C08L75/04

  Polyurethanes · CPC title

• C08G18/542 Primary

  with phenols · CPC title

• C08J2315/02

  Rubber derivatives containing halogen · CPC title