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    METHOD OF PREPARING GYPSUM WALLBOARD FROM HIGH SALT GYPSUM, AND RELATED PRODUCT
    2.
    发明申请
    METHOD OF PREPARING GYPSUM WALLBOARD FROM HIGH SALT GYPSUM, AND RELATED PRODUCT 审中-公开

    公开(公告)号：WO2021091778A1

    公开(公告)日：2021-05-14

    申请号：PCT/US2020/058092

    申请日：2020-10-30

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： LI, Qinghua ,  HEMPHILL, Mark K.

    IPC: B32B5/14 ,  B32B5/20 ,  B32B13/08 ,  B32B29/00 ,  C04B24/38 ,  E04C2/04 ,  C04B28/14

    Abstract: A composite gypsum board and a method of preparing the board. The board contains set gypsum layers sandwiched between two cover sheets. The set gypsum layers are formed from at least stucco and water. The set gypsum layers include a board core and one or more skim coat layers. The set gypsum core makes up a substantial thickness of the total thickness of all the gypsum layers. A first skim coat layer is included on one side of the core, facing a first (face) cover sheet. A second skim coat layer is included on the other side of the core, facing a second (back) cover sheet. At least the second skim layer is formed from a slurry that contains starch. The stucco material generally includes a high salt impurity content, for example, when the stucco is calcined from certain sources of low-quality synthetic gypsum.

    SILOXANE POLYMERIZATION IN GYPSUM WALLBOARD
    3.
    发明申请
    SILOXANE POLYMERIZATION IN GYPSUM WALLBOARD 审中-公开

    公开(公告)号：WO2020018531A1

    公开(公告)日：2020-01-23

    申请号：PCT/US2019/041997

    申请日：2019-07-16

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： LI, Qinghua ,  HEMPHILL, Mark K. ,  RISCHE, Trevor S.

    IPC: C04B24/42 ,  C04B28/14

    Abstract: A method of making a gypsum board including: preparing an aqueous slurry including a mixture of: calcium sulfate hemihydrate, water at a weight ratio of water to calcium sulfate hemihydrate of 0.2:1 to 1.2:1, and on a dry basis per 100 parts by weight (pbw) calcium sulfate hemihydrate: 0.2 to 2 pbw siloxane, 0.01 to 2 pbw siloxane polymerization catalyst including magnesium oxide and optionally fly ash, and 0.01 to 0.2 pbw triethanolamine (TEOA); allowing the siloxane to polymerize to polysiloxane; and depositing the slurry on a first cover sheet and covering the slurry with a second cover sheet to shape the slurry, and allowing the shaped slurry to set to form the gypsum board. Also, disclosed is the gypsum board resulting from the method.

    FIRE RESISTANT GYPSUM BOARD AND RELATED METHODS
    4.
    发明申请
    FIRE RESISTANT GYPSUM BOARD AND RELATED METHODS 审中-公开

    公开(公告)号：WO2021154988A1

    公开(公告)日：2021-08-05

    申请号：PCT/US2021/015478

    申请日：2021-01-28

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： LI, Qinghua ,  HEMPHILL, Mark K. ,  PUNATI, Naveen

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

    Abstract: A gypsum board having face and back cover sheets, a board core disposed between the face and back cover sheets, the core having set gypsum formed from a core slurry of water and stucco, a back skim coat layer defining first and second skim coat faces, the back skim coat formed from a back skim coat slurry of water, stucco, and a skim coat intumescent material, the back skim coat disposed in bonding relation to the core, the first face of the skim coat layer facing the back cover sheet, and the second face of the skim coat layer facing the board core, and the gypsum board having a High Temperature Shrinkage (S) of about 10% or less in the z direction when heated to about 1560 °F (850 °C), according to ASTM C1795-15.

    GYPSUM BOARD CONTAINING HIGH ABSORPTION PAPER AND RELATED METHODS
    6.
    发明申请
    GYPSUM BOARD CONTAINING HIGH ABSORPTION PAPER AND RELATED METHODS 审中-公开

    公开(公告)号：WO2021101691A1

    公开(公告)日：2021-05-27

    申请号：PCT/US2020/058095

    申请日：2020-10-30

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： LI, Qinghua ,  HEMPHILL, Mark K.

    IPC: C04B28/14

    Abstract: Disclosed are a composite gypsum board and a method of preparing composite gypsum board. The board contains at least one set gypsum layer sandwiched between two cover sheets. The set gypsum layer is formed from at least stucco and water. The stucco material generally includes a high salt impurity content, for example, when the stucco is calcined from certain sources of low-quality synthetic gypsum. For example, in some embodiments, the salts are chloride salts, e.g., sodium chloride (NaCl), potassium chloride (KCl), magnesium chloride (MgCl2), and/or calcium chloride (CaCl2). At least one of the cover sheets is composed of high absorption paper, which enhances the bond between the set gypsum layer and the cover sheet.

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