公开(公告)号：US11834374B2

公开(公告)日：2023-12-05

申请号：US16126953

申请日：2018-09-10

Applicant: United States Gypsum Company

Inventor： Yijun Sang ,  Mark K. Hemphill ,  Yongman Kim ,  James W. Barber

IPC: C04B24/10 ,  C04B28/14 ,  C04B38/00 ,  C04B11/024 ,  C04B11/032 ,  C04B11/26 ,  C04B40/00 ,  C04B24/38 ,  C04B111/00 ,  C04B103/12

CPC classification number: C04B28/14 ,  C04B11/024 ,  C04B11/032 ,  C04B11/268 ,  C04B24/38 ,  C04B40/0039 ,  C04B2103/12 ,  C04B2111/0062 ,  C04B2201/10

Abstract: An accelerator for accelerating the rate of hydration of calcined gypsum is disclosed. The accelerator comprises calcium sulfate dihydrate particles and a starch. The starch has a cold water solubility of at least about 25% (e.g., at least about 35%) and a viscosity of about 25 Brabender Units (BU) or less when the starch is in a 30% aqueous slurry at 92° C. Also disclosed are a method of preparing an accelerator, method of hydrating stucco to form set gypsum, slurry, and method of making gypsum board.

公开(公告)号：US11135818B2

公开(公告)日：2021-10-05

申请号：US16554298

申请日：2019-08-28

Applicant: United States Gypsum Company

Inventor： Yijun Sang ,  Weixin D. Song

IPC: B32B27/08

Abstract: Disclosed are product (e.g., panels), slurry, and methods relating to a pregelatinized starch having a mid-range viscosity (i.e., from about 20 centipoise to about 700 centipoise).

公开(公告)号：US11046053B2

公开(公告)日：2021-06-29

申请号：US16581070

申请日：2019-09-24

Applicant: United States Gypsum Company

Inventor： Mark Hemphill ,  Yijun Sang

IPC: B32B13/08 ,  B32B7/02 ,  C04B28/14 ,  E04B2/72 ,  E04C2/26 ,  C04B111/00

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.

公开(公告)号：US11008257B2

公开(公告)日：2021-05-18

申请号：US16027028

申请日：2018-07-03

Applicant: United States Gypsum Company

Inventor： Yijun Sang ,  Brian J. Christ

IPC: C04B28/14 ,  C04B24/38 ,  C04B22/16 ,  E04C2/04 ,  C04B24/10 ,  B32B13/02 ,  C04B111/00 ,  E04B2/72

Abstract: Disclosed are product (e.g., board), slurry, and methods relating to an uncooked starch that can be used to enhance strength in one or more gypsum layers in the board. The uncooked starch has a hot water viscosity of from about 20 BU to about 300 BU according to the HWVA method, and/or a mid-range peak viscosity of from about 120 Brabender Units to about 1000 Brabender Units.

公开(公告)号：US11002010B2

公开(公告)日：2021-05-11

申请号：US16356303

申请日：2019-03-18

Applicant: United States Gypsum Company

Inventor： Suman Sinha Ray ,  Mark Antosh ,  Mark Hemphill ,  Yijun Sang

IPC: E04C2/04 ,  B32B7/12 ,  B32B13/04 ,  B32B37/24 ,  E04B2/72 ,  E04B2/00 ,  E04B1/84 ,  E04B1/86 ,  G10K11/168 ,  E04B1/82 ,  B32B13/08 ,  B32B13/12 ,  E04B1/74

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 (Tg) of −10° C. to 30° C.; 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.

公开(公告)号：US10737979B2

公开(公告)日：2020-08-11

申请号：US15918449

申请日：2018-03-12

Applicant: UNITED STATES GYPSUM COMPANY

Inventor： Runhai Lu ,  Yijun Sang ,  Weixin D. Song

IPC: C04B22/14 ,  C04B28/14 ,  C04B24/22 ,  C04B22/16 ,  C04B18/24 ,  C04B24/38 ,  C04B20/02 ,  C04B40/00 ,  C04B111/00 ,  C04B103/12 ,  C04B103/52

Abstract: A modified gypsum set accelerator and a method of preparing the same is provided, which includes dry loose finely ground particles of a mixture of ground dry calcium sulfate dihydrate and a grinding aid selected from one or more of beta-naphthalene sulfonate formaldehyde condensate, trimetaphosphate phosphate salt, tripolyphosphate salt, tetra-pyrophosphate salt, and pregelatinized starch.

公开(公告)号：US10399899B2

公开(公告)日：2019-09-03

申请号：US13835002

申请日：2013-03-15

Applicant: United States Gypsum Company

Inventor： Yijun Sang ,  Weixin D. Song

IPC: C04B11/00 ,  E04C2/26 ,  E04C2/04 ,  C04B28/14 ,  C04B111/00

Abstract: Disclosed are product (e.g., panels), slurry, and methods relating to a pregelatinized starch having a mid-range viscosity (i.e., from about 20 centipoise to about 700 centipoise).

公开(公告)号：US20170030076A1

公开(公告)日：2017-02-02

申请号：US14815675

申请日：2015-07-31

Applicant: UNITED STATES GYPSUM COMPANY

Inventor： Alfred Li ,  Yijun Sang ,  David Song

IPC: E04C2/04 ,  B32B13/08 ,  B32B5/02 ,  B32B37/12 ,  B32B37/20

CPC classification number: E04C2/043 ,  B32B3/266 ,  B32B5/02 ,  B32B13/02 ,  B32B13/08 ,  B32B13/14 ,  B32B29/02 ,  B32B37/12 ,  B32B37/20 ,  B32B2037/1276 ,  B32B2250/05 ,  B32B2250/40 ,  B32B2260/021 ,  B32B2260/044 ,  B32B2305/08 ,  B32B2305/38 ,  B32B2307/50 ,  B32B2317/12 ,  B32B2607/00 ,  E04B2103/02 ,  E04C2/06

Abstract: A wallboard panel is provided, including a sheet of face paper, a first layer of gypsum composition having a first density, a web of mesh associated with the first layer of gypsum composition, a second layer of gypsum composition having a second density, the second density being lower than the first density, and a layer of backing paper. An associated method includes providing a sheet of face paper and laying same upon a moving conveyor belt, applying a first layer of gypsum composition slurry upon the sheet of face paper, applying a web of mesh upon the first layer of gypsum composition slurry, applying a second layer of gypsum composition slurry upon the web of mesh, and applying a sheet of backing paper upon the second layer of gypsum composition slurry.

Abstract translation: 提供了一种墙板，包括一张面纸，具有第一密度的第一层石膏组合物，与第一层石膏组合物相关联的网状网，具有第二密度的第二层石膏组合物，第二层 密度低于第一密度，和一层背衬纸。 相关联的方法包括提供一张面纸并将其放置在移动的传送带上，将第一层石膏组合物浆料施加在面纸片上，在第一层石膏组合物浆料上施加网状网， 第二层石膏组合物浆料在网状物上，并将一片背衬纸施加在第二层石膏组合物浆料上。

公开(公告)号：US20160375656A1

公开(公告)日：2016-12-29

申请号：US15186212

申请日：2016-06-17

Applicant: United States Gypsum Company

Inventor： Alfred C. Li ,  Weixin D. Song ,  Yijun Sang ,  Gregg G. Diefenbacher ,  Annamaria Vilinska ,  Brian J. Christ ,  Fredrick T. Jones ,  Bradley W. Todd

IPC: B32B13/02 ,  C04B24/38 ,  B32B13/08 ,  C04B11/00 ,  B32B13/04 ,  B32B7/02

Abstract: Disclosed is a composite gypsum board comprising a board core and a concentrated layer of substantial thickness (e.g., at least about 0.02 inches). The concentrated layer includes a higher weight percentage of an enhancing additive than the board core. The board core has a thickness greater than the thickness of the concentrated layer and forms the bulk of the board volume. The concentrated layer has a higher density (e.g., at least about 1.1 times greater) than the density of the board core. Also disclosed is a method of preparing a composite gypsum board.