GYPSUM BOARD HAVING POLYVINYL ALCOHOL BINDER IN INTERFACE LAYER AND METHOD FOR MAKING THE SAME

Title:

GYPSUM BOARD HAVING POLYVINYL ALCOHOL BINDER IN INTERFACE LAYER AND METHOD FOR MAKING THE SAME

Document Type and Number:

WIPO Patent Application WO2004018172

Kind Code:

A3

Abstract:

Paper and/or mat-faced gypsum board is prepared by applying a relatively thin coating of aqueous gypsum slurry containing a polyvinyl alcohol binder to one or two facer sheets. The polyvinyl alcohol binder provides adequate adhesion between the set gypsum core and the adjacent facer sheet(s) without the need for starch or other conventional binders. In one embodiment, polyvinyl alcohol is concentrated in one or more regions of the core adjacent to the facer sheet(s). In another embodiment, polyvinyl alcohol is applied to an aqueous gypsum slurry used to form the bulk core, such that the polyvinyl alcohol is present throughout the core.

Inventors:

FRANCIS HUBERT C
KSIONZYK ANNE H
ESGUERRA FABIO E

Application Number:

PCT/US2003/019883

Publication Date:

November 04, 2004

Filing Date:

July 30, 2003

Export Citation:

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Assignee:

G P GYPSUM CORP (US)

International Classes:

B28B1/30; B28B3/12; B32B13/04; B32B13/08; C04B24/26; C04B28/14; E04C2/04; (IPC1-7): B32B29/00

Foreign References:

US4647496A	1987-03-03
US5644880A	1997-07-08
US4879173A	1989-11-07
US5552187A	1996-09-03
US6485821B1	2002-11-26

Other References: