Patent SG-11201804702R-A (SG)
Title: Method for the production of gypsum-based boards and stucco slurry comprising non-pregelatinized migratory starch for use therewith
Inventor: MORLAT RICHARD
IPC: C04B28/14
Filed: 2016-12-14
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau 111111111111110 III OE III OE III II III 11111111111111111111111111111R111 1111111H (43) International Publication Date 29 June 2017 (29.06.2017) (10) International Publication Number WO 2017/109459 Al WIPO I PCT (51) International Patent Classification: C04B 28/14 (2006.01) C04B 11/00 (2006.01) (21) International Application Number: PCT/GB2016/053930 (22) International Filing Date: 14 December 2016 (14.12.2016) English English (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art 21(3)) (25) Filing Language: (26) Publication Language: (30) Priority Data: 1522664.0 22 December 2015 (22.12.2015) GB (71) Applicant: SAINT-GOBAIN PLACO SAS; 34 Avenue Franklin Roosevelt, 92150 Suresnes (FR). (72) Inventors: MORLAT, Richard; Gyproc Process Innova- tion, 306 a 348 Route de Meaux, 93410 Vaujours (FR). FLETCHER, James; Technical Building, East Leake, Loughborough LE12 6JS (GB). KAMLER, Radomir; c/o Saint-Gobain Construction Products CZ A.S., Pocernicka 272/96, 108 03 Prague 10 (CZ). (74) Agents: CHAPMAN, Helga et al.; 18 Staple Gardens, Winchester Hampshire S023 8SR (GB). W O 20 17 / 109 45 9 Al (54) Title: METHOD FOR THE PRODUCTION OF GYPSUM-BASED BOARDS AND STUCCO SLURRY COMPRISING NON-PREGELATINIZED MIGRATORY STARCH FOR USE THEREWITH (57) : A method for continuously forming gypsum-based panels of high fixing strength comprises the steps of: • forming a mixture comprising stucco, non-pregelatinized migratory starch, glass fibre, fluidizer and water; • casting the mixture in a continuous band; • maintaining the band under conditions sufficient for the stucco to form an interlocking matrix of set gypsum; • cutting the band to foiin one or more wet panel precursors; and • drying the wet panel precursor to form one or more gypsum-based panels. • The weight ratio of water to stucco in the mixture is less than 0.7; • the stucco is present in the mixture in an amount of over 60 wt% relative to the total solids content of the mixture; • the starch is present in the mixture in an amount of over 3 wt% relative to the the stucco; • the glass fibre is present in the mixture in an amount of over 1 wt% relative to the stucco; • the fluidizer is is present in the mixture in an amount of at least 0,1 wt% relative to the stucco; and the density of the gypsum-based panel is greater than 700 kg/m.