# US 2020/0399898 A1 · Construction Panel Having Improved Fixing Strength > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399898 A1 - Document ID: US20200399898A1 - Status: Published application - Kind: A1 - Application number: 16/917,302 - Filed: 2020-06-30 - Published: 2020-12-24 - Earliest claimed: 2014-11-20 - Assignees: Saint-Gobain Placo - Applicants: Saint-Gobain Placo SAS - Inventors: Laura Brooks; Nicola Jupp; Joanna Sparkes; Elodie Taboulot; Adam Richardson; Nicholas Jones; Jan Rideout - Web page: https://patentgrep.com/patent/US20200399898A1 ## CPC - E04C 2/043: {of plaster (E04C2/049 takes precedence)} - C04B 14/42: Glass - C04B 16/02: Cellulosic materials (cellulosic waste materials, e.g. sawdust, rice husks, C04B18/24) - C04B 24/383: {Cellulose or derivatives thereof} - C04B 28/14: containing calcium sulfate cements {(gypsum-paper plates E04C)} - C04B 2111/0062: {Gypsum-paper board like materials} - Y02W 30/91: Use of waste materials as fillers for mortars or concrete - E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S) - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT ## Abstract A plasterboard comprises a gypsum matrix having a polymeric additive distributed therein in an amount of at least 1 wt % relative to the gypsum, the gypsum matrix further having a first group of fibres and a second group of fibres embedded therein, wherein the fibres of the first group of fibres have an average length that is at least three times the average length of the fibres of the second group of fibres. ## Claims ### Claim 1 A plasterboard comprising a gypsum matrix having a polymeric additive distributed therein in an amount of at least 1 wt % relative to the gypsum of the gypsum matrix, the gypsum matrix further having a first group of fibres and a second group of fibres embedded therein, wherein the fibres of the first group of fibres have an average length that is at least three times the average length of the fibres of the second group of fibres. ### Claim 2 (depends on 1) A plasterboard according to claim 1, wherein the fibres of the first group of fibres have an average length of 2-10 mm. ### Claim 3 (depends on 1) A plasterboard according to claim 1, wherein the first and second groups of fibres are present in a total amount that is less than 20 wt % relative to the gypsum matrix. ### Claim 4 (depends on 1) A plasterboard according to claim 1, wherein the first group of fibres comprises glass fibres. ### Claim 5 (depends on 1) A plasterboard according to claim 1, wherein the second group of fibres comprises cellulose-based fibres. ### Claim 6 (depends on 5) A plasterboard according to claim 5, wherein the cellulose-based fibres have a length of 200 micron to 1.8 mm. ### Claim 7 (depends on 5) A plasterboard according to claim 5, wherein the cellulose-based fibres have a thickness of 20-60 micron. ### Claim 8 (depends on 1) A plasterboard according to claim 1, wherein the polymeric additive is starch. ### Claim 9 (depends on 1) A plasterboard according to claim 1, wherein the polymeric additive is present in an amount of less than 20 wt % relative the gypsum matrix. ### Claim 10 (depends on 1) A plasterboard according to claim 1, wherein the plasterboard comprises a facing. ### Claim 11 (depends on 1) A plasterboard according to claim 1, wherein the plasterboard comprises a mat. ### Claim 12 (depends on 11) A plasterboard according to claim 11, wherein the mat is partially embedded in a surface of the plasterboard. ### Claim 13 (depends on 11) A plasterboard according to claim 11, wherein the mat is fully embedded in a surface of the plasterboard. ### Claim 14 (depends on 11) A plasterboard according to claim 11, wherein the mat comprises a glass mat. ### Claim 15 A plasterboard comprising: a gypsum matrix; a polymeric additive within the gypsum matrix in an amount of at least 1 wt % relative to the gypsum of the gypsum matrix; cellulose-based fibres within the gypsum matrix; and glass fibres within the gypsum matrix, the glass fibres having an average length that is at least three times the average length of the cellulose-based fibres. ### Claim 16 (depends on 15) The plasterboard of claim 15, wherein the glass fibres have an average length of 2-10 mm. ### Claim 17 (depends on 15) The plasterboard of claim 15, wherein the cellulose-based fibres and glass fibres are present in a total amount that is less than 20 wt % relative to the gypsum matrix. ### Claim 18 (depends on 15) The plasterboard of claim 15, wherein the cellulose-based fibres have a length of 200 micron to 1.8 mm. ### Claim 19 (depends on 15) The plasterboard of claim 15, wherein the polymeric additive is present in an amount of less than 20 wt % relative the gypsum matrix. ### Claim 20 (depends on 15) The plasterboard of claim 15, wherein the polymeric additive is starch.