EP 4081394 A1 20221102 - COMPOSITE GYPSUM BOARD FORMED FROM HIGH-SALT STUCCO AND RELATED METHODS
Title (en)
COMPOSITE GYPSUM BOARD FORMED FROM HIGH-SALT STUCCO AND RELATED METHODS
Title (de)
ZUSAMMENGESETZTE GIPSPLATTE AUS HOCHSALZHALTIGEM STUCK UND ZUGEHÖRIGE VERFAHREN
Title (fr)
PLAQUE DE PLÂTRE COMPOSITE FORMÉE À PARTIR DE STUC À HAUTE TENEUR EN SEL ET PROCÉDÉS ASSOCIÉS
Publication
Application
Priority
- US 201962953764 P 20191226
- US 202016904779 A 20200618
- CA 3084939 A 20200626
- US 2020058100 W 20201030
Abstract (en)
[origin: CA3084939A1] 5007 CA GYP 218 ABSTRACT OF THE DISCLOSURE Disclosed are a composite gypsum board and a method of preparing gypsum board. The board contains at least one set gypsum layer sandwiched between face and back 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 (NaC1), potassium chloride (KC1), magnesium chloride (MgC12), and/or calcium chloride (CaC12). The board and methods improve the bond between the gypsum layer(s) and at least one of the cover sheets (e.g., the back cover sheet). Also provided are methods and systems relating to drying gypsum board. Date Recue/Date Received 2020-06-26
IPC 8 full level
B32B 3/26 (2006.01); B32B 5/14 (2006.01); B32B 5/20 (2006.01); B32B 13/08 (2006.01); B32B 29/00 (2006.01); C04B 24/38 (2006.01); D21H 19/54 (2006.01); E04C 2/04 (2006.01)
CPC (source: EP)
B32B 3/266 (2013.01); B32B 5/145 (2013.01); B32B 5/20 (2013.01); B32B 13/02 (2013.01); B32B 13/08 (2013.01); B32B 29/002 (2013.01); B32B 29/005 (2013.01); C04B 28/145 (2013.01); D21H 17/28 (2013.01); D21H 19/54 (2013.01); D21H 27/30 (2013.01); E04C 2/043 (2013.01); B32B 2250/02 (2013.01); B32B 2250/03 (2013.01); B32B 2250/26 (2013.01); B32B 2250/40 (2013.01); B32B 2255/12 (2013.01); B32B 2255/20 (2013.01); B32B 2255/24 (2013.01); B32B 2307/536 (2013.01); B32B 2307/546 (2013.01); B32B 2307/72 (2013.01); B32B 2307/722 (2013.01); B32B 2419/00 (2013.01); B32B 2607/00 (2013.01); C04B 2111/0062 (2013.01); Y02W 30/91 (2015.05)
C-Set (source: EP)
Citation (search report)
See references of WO 2021133463A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
CA 3084939 A1 20210626; EP 4081394 A1 20221102; JP 2023507715 A 20230227; MX 2022006375 A 20220624
DOCDB simple family (application)
CA 3084939 A 20200626; EP 20811878 A 20201030; JP 2022534683 A 20201030; MX 2022006375 A 20201030