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    COMPOSITE GYPSUM BOARD AND RELATED METHODS
    1.
    发明申请
    COMPOSITE GYPSUM BOARD AND RELATED METHODS 审中-公开

    公开(公告)号：WO2020167742A1

    公开(公告)日：2020-08-20

    申请号：PCT/US2020/017631

    申请日：2020-02-11

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： HEMPHILL, Mark ,  SANG, Yijun

    IPC: B32B13/08 ,  B32B5/20 ,  B32B7/02 ,  E04C2/04

    Abstract: Disclosed is a composite gypsum board comprising a board core comprising set gypsum sandwiched between face and back cover sheets. The composite gypsum board also comprises an intermediate sheet between the board core and the face cover sheet, with a thin, dense gypsum layer disposed between the intermediate sheet and the face cover sheet. Optionally, a second dense gypsum layer can be disposed between a first major side of the board core and the back cover sheet. Also disclosed is a method of preparing a composite gypsum board in which an intermediate sheet is applied over a dense gypsum layer disposed on a face cover sheet. A back cover sheet is applied to the other major side of the board core, with a second dense gypsum layer optionally disposed therebetween.

    SLURRY COMPRISING ACID-MODIFIED FLOUR, GYPSUM BOARD MADE FROM THIS SLURRY AND METHOD TO MAKE THIS GYPSUM BOARD
    2.
    发明申请
    SLURRY COMPRISING ACID-MODIFIED FLOUR, GYPSUM BOARD MADE FROM THIS SLURRY AND METHOD TO MAKE THIS GYPSUM BOARD 审中-公开

    公开(公告)号：WO2021101960A1

    公开(公告)日：2021-05-27

    申请号：PCT/US2020/061003

    申请日：2020-11-18

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： SANG, Yijun ,  HEMPHILL, Mark

    IPC: C04B28/14 ,  C09J103/02 ,  C08B30/12

    Abstract: Disclosed is an acid-modified flour and a method of making the acid- modified flour. The acid-modified flour is desirably prepared using a dry milling process. A starting flour is combined with a strong acid to form a mixture. The mixture is heated. A neutralizer is added to increase the pH of the mixture. If desired, the mixture can be dried and any agglomerates can be removed. The acid-modified flour can be used as a binder in a slurry for preparing one or more gypsum layers in a gypsum board. Claimed is a method of making gypsum board comprising: (a) forming an acid-modified flour (b) adding the acid-modified flour to at least water and stucco to form a slurry; (c) disposing the slurry to form a gypsum board core between a first cover sheet and a second cover sheet to form a wet assembly; (d) cutting the wet assembly into the gypsum board; and (e) drying the gypsum board. Claimed is a slurry comprising water, stucco, and at least one acid- modified flour having a hot water viscosity of from 50 BU to 420 BU, as measured according to the HWVA test.

    GYPSUM BOARD FROM GYPSUM HAVING HIGH LEVEL OF CHLORIDE SALT AND A PERFORATED SHEET AND METHODS ASSOCIATED THEREWITH
    6.
    发明申请
    GYPSUM BOARD FROM GYPSUM HAVING HIGH LEVEL OF CHLORIDE SALT AND A PERFORATED SHEET AND METHODS ASSOCIATED THEREWITH 审中-公开

    公开(公告)号：WO2020036839A1

    公开(公告)日：2020-02-20

    申请号：PCT/US2019/046091

    申请日：2019-08-12

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： HEMPHILL, Mark ,  LI, Qinghua ,  COCHRAN, Charles, W.

    IPC: E04C2/04 ,  C04B28/14 ,  B32B13/08 ,  B28B19/00

    Abstract: Gypsum boards formed from synthetic gypsum and other gypsum sources having high chloride salt concentrations. The gypsum boards may include a set gypsum board core layer between a front and back paper cover sheets. The back paper cover sheet has a plurality of perforations extending therethrough. Methods of making the gypsum boards, and a wall system for employing the gypsum boards, are also provided. The concentration of the chloride anion in aqueous gypsum slurry used to make the set gypsum board core layer and to perform the methods of the invention may range from about 500 ppm to about 3000 ppm, typically from about 500 ppm to about 2000 ppm per 1,000,000 parts by weight calcium sulfate hemihydrate, more typically from about 500 ppm to about 1500 ppm per 1,000,000 parts by weight calcium sulfate hemihydrate.

    METHODS FOR MAKING HIGH SOUND TRANSMISSION CLASS GYPSUM BOARDS AND GYPSUM BOARDS MADE BY THE METHOD
    7.
    发明申请
    METHODS FOR MAKING HIGH SOUND TRANSMISSION CLASS GYPSUM BOARDS AND GYPSUM BOARDS MADE BY THE METHOD 审中-公开

    公开(公告)号：WO2019213045A1

    公开(公告)日：2019-11-07

    申请号：PCT/US2019/029853

    申请日：2019-04-30

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： RAY, Suman, Sinha ,  ANTOSH, Mark ,  HEMPHILL, Mark ,  SANG, Yijun

    IPC: B32B7/12 ,  B32B13/08 ,  E04B1/86 ,  E04B9/04 ,  E04C2/24

    Abstract: A layered gypsum wallboard can include: a gypsum board having opposing front and back faces, wherein the gypsum board comprises a first cover sheet material at the front face, a second cover sheet material at the back face, and a gypsum core layer comprising gypsum; an adhesive layer on the second cover sheet material of the gypsum board, the adhesive including a polymer having a glass transition temperature (T g ) of -10 ℃ to 30 ℃; an intermediate gypsum layer including gypsum on the adhesive layer such that the adhesive layer is between the second cover sheet material and the intermediate gypsum layer, wherein the adhesive layer and the intermediate gypsum layer have a combined thickness of 0.09 inches to 0.25 inches; and a third cover sheet material, wherein the intermediate gypsum layer is between and in contact with the adhesive layer and the third cover sheet material.

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