WO1999054265A1 - Gypsum plaster - Google Patents

Gypsum plaster Download PDF

Info

Publication number
WO1999054265A1
WO1999054265A1 PCT/GB1999/001198 GB9901198W WO9954265A1 WO 1999054265 A1 WO1999054265 A1 WO 1999054265A1 GB 9901198 W GB9901198 W GB 9901198W WO 9954265 A1 WO9954265 A1 WO 9954265A1
Authority
WO
WIPO (PCT)
Prior art keywords
paste
plaster
gypsum
binder
gypsum plaster
Prior art date
Application number
PCT/GB1999/001198
Other languages
French (fr)
Inventor
Lydia Luchkevich
Peter Mayer
Jason Davies
Original Assignee
Bpb Plc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bpb Plc filed Critical Bpb Plc
Priority to AU36157/99A priority Critical patent/AU3615799A/en
Priority to CA002329424A priority patent/CA2329424A1/en
Priority to EP99918114A priority patent/EP1080051A1/en
Publication of WO1999054265A1 publication Critical patent/WO1999054265A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
    • C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00068—Mortar or concrete mixtures with an unusual water/cement ratio
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00129—Extrudable mixtures

Definitions

  • the invention relates to the production of formed gypsum products and to a composition therefor.
  • Gypsum plaster calcium sulphate hemihydrate, is generally formed by the calcining of gypsum, calcium sulphate dihydrate, although it may be formed in other ways. On addition of water, gypsum plaster rehydrates to gypsum and can be formed into a coherent body. Gypsum plaster requires 18.5% water by weight of plaster to fully rehydrate it.
  • plaster is mixed with an excess of water to form a slurry of a creamy, pouring, consistency.
  • the slurry may contain setting control agents and other additives such as fibres and lightweight aggregates.
  • the slurry is fed onto a continuous belt and as it sets it is constrained into the desired shape.
  • the set formed product contains water, since an excess was used to form the slurry; the formed product must be dried by heating, at considerable cost, since set plaster containing as little as 5% by weight free water has very low strength.
  • an extrudable gypsum plaster paste can be formed using a stoichiometric or close to stoichiometric amount of water.
  • a gypsum plaster paste comprising: ⁇ gypsum plaster; water in a substantially stoichiometric amount (as herein defined) ; a binder; and a clay or another rheology modifier functionally equivalent to a clay.
  • a method for making a gypsum plaster paste comprising: mixing ⁇ gypsum plaster, water in a substantially stoichiometric amount (as herein defined) and a binder; and mixing into that mixture a clay or other rheology modifier functionally equivalent to a clay.
  • a gypsum plaster paste comprising: ⁇ gypsum plaster; water in a substantially stoichiometric amount (as herein defined) ; a binder; and a rheology modifier such that the paste has a yield stress sufficient to make the paste self supporting.
  • the rheology modifier is a clay.
  • Preferred binders are cellulosic binders .
  • the stoichiometric amount of water is that amount needed to achieve complete rehydration of the plaster from the hemihydrate to the dihydrate, and no more.
  • the paste contains only a gypsum plaster.
  • the paste may include an extrusion aid.
  • the clay or other rheology modifier is present in an amount up to 20% , preferably of from 10 to 12% for extrusion purposed by weight of plaster.
  • a method for making a gypsum plaster paste mixing ⁇ gypsum plaster, water in a substantially stoichiometric amount (as herein defined) and a binder; and mixing into that mixture a rheology modifier such that the paste has a yield stress sufficient to make the paste self supporting.
  • Preferred rheology modifiers are clays.
  • Preferred cellulosic binders are cellulose ethers; particularly preferred are those having a molecular weight between 12000 and 30000.
  • Other suitable binders include polyvinylalcohol (PVA) and polyethyleneglycol (PEG) , either alone or in combination.
  • PVA polyvinylalcohol
  • PEG polyethyleneglycol
  • the binder is present at a level of at least 0.1%, and more preferably at least 1%, by weight.
  • the binder is present at a level of no more than 10%, more preferably no more 5%, by weight of plaster.
  • the binder preferably a cellulosic binder, is preferably suspended in the water before it is mixed with the gypsum plaster.
  • An extrusion aid may be included in the plaster/water mixture before mixing with the clay.
  • the water content of the mixture is between 13% and 32% based on the weight of ⁇ plaster. This corresponds to between 70% and 170% of the stoichiometric amount.
  • the unrehydrated plaster acts as a filler; in contrast to other proposed processes using near stoichiometric amounts of water, the water and the unrehydrated plaster is easily dispersed throughout the paste and there is virtually no free water in the paste.
  • a retarder such as diethyl triamine pentacetic acid (DTPA) is employed as a retarder to prevent the paste from setting during processing.
  • elevated temperatures preferably above 60°C can be employed; at such temperatures, the plaster will not set, allowing the mixture to be mixed thoroughly and avoiding the plaster setting in the mixer or elsewhere in the process .
  • a preferred clay is Grolleg English china clay, but other clays may be used; examples of other clays are ball, atapulgous and bentonitic clays.
  • the rheological effect of clays and other rheology modifiers on the paste will differ depending on the type of clay or other modifier employed. Those skilled in the art will be able to select an appropriate clay or other modifier to achieve a desired rheology, using if necessary simple experimentation.
  • the paste of the invention is particularly suitable for forming into a desired shape by extrusion.
  • the paste is self supporting it will normally be necessary to support the formed paste immediately it leaves the die, for example on a moving bel .
  • the extended product can be cut to length before or after setting.
  • the paste can be formed into product by other plastic forming processes such as pressing, stamping, rolling and injection moulding.
  • yield stress is the stress which must be exceeded in order to cause measurable flow in the paste.
  • the measured yield stress will be different depending on the processing to which the paste is subjected, such as extrusion or rolling.
  • Yield stress is measured using standard rheological techniques such as by use of a controlled stress rheometer .
  • lightweight aggregates preferably up to 20% by weight of, allows the density of the formed product to be reduced to 1.5 g/ml or lower.
  • Preferred aggregates include lightweight ceramic microspheres , and cenospheres .
  • Fibres may be added to the paste, preferably up to 10% by weight of plaster.
  • Preferred fibres included glass and polypropylene fibres .
  • a pre-gel/suspension was formed by combining:
  • DTPA setting retarder 41% solution: 0.66 % methylcellulose (Methocel A4M) : 3.18 % water: 96.16 %
  • the pre-gel/suspension was used to make the following composition:
  • This composition was mixed in a Z-blade mixer at ambient temperature for about 4 minutes. To this composition was added 9.82% by weight of the total mixture Grolleg English china clay and the resulting mixture was mixed for a further 3 minutes until the resulting paste was sufficiently plastic to be extruded. The paste was then removed from the mixer and introduced into the pugging section of a Kema extruder. It was then deaired in the vacuum section of the extruder and extruded through a die, the extruded paste being supported on a conveyor as it exited the die. The extruded products were cut to length before they set .
  • the density of the extruded product was 2.09 g/ml.
  • the Rockwell hardness was 119 and the modulus of rupture 11.5 M Pa. In other examples, a modulus of rupture of up to 25 M Pa has been achieved.

Abstract

An extrudable gypsum plaster paste is disclosed comprising: α gypsum plaster; water in a substantially stoichiometric amount; a binder; and a clay or another rheology modifier functionally equivalent to a clay. Such pastes can have a yield stress sufficient to make the paste self supporting. The invention also provides a method for making an extrudable gypsum plaster paste comprising: mixing α gypsum plaster, water in a substantially stoichiometric amount and a binder; and mixing into that mixture a clay or other rheology modifier functionally equivalent to a clay.

Description

GYPSUM PLASTER
The invention relates to the production of formed gypsum products and to a composition therefor.
Gypsum plaster, calcium sulphate hemihydrate, is generally formed by the calcining of gypsum, calcium sulphate dihydrate, although it may be formed in other ways. On addition of water, gypsum plaster rehydrates to gypsum and can be formed into a coherent body. Gypsum plaster requires 18.5% water by weight of plaster to fully rehydrate it.
In the conventional production of formed gypsum products, plaster is mixed with an excess of water to form a slurry of a creamy, pouring, consistency. The slurry may contain setting control agents and other additives such as fibres and lightweight aggregates. The slurry is fed onto a continuous belt and as it sets it is constrained into the desired shape. The set formed product contains water, since an excess was used to form the slurry; the formed product must be dried by heating, at considerable cost, since set plaster containing as little as 5% by weight free water has very low strength.
Attempts have been made to form plaster products from a plaster/water mix containing only slightly more than the stoichiometric amount of water, to reduce the energy needed to dry the formed product. It has not proved possible heretofore to provide such a mix having satisfactory rheology to enable it to be formed, for example by extrusion; the mixture tends to be friable and does not produce a satisfactorily smooth surface to the formed product. This is in part because since the mixture is not fluid, adequate mixing of the water with the plaster is not achieved. This leaves pockets of unrehydrated plaster and an excess of water elsewhere .
It has now been found that an extrudable gypsum plaster paste can be formed using a stoichiometric or close to stoichiometric amount of water.
According to a first aspect of the invention there is provided a gypsum plaster paste comprising: α gypsum plaster; water in a substantially stoichiometric amount (as herein defined) ; a binder; and a clay or another rheology modifier functionally equivalent to a clay.
Also according to the first aspect of the invention there is provided a method for making a gypsum plaster paste comprising: mixing α gypsum plaster, water in a substantially stoichiometric amount (as herein defined) and a binder; and mixing into that mixture a clay or other rheology modifier functionally equivalent to a clay.
According to a second aspect of the invention there is provided a gypsum plaster paste comprising: α gypsum plaster; water in a substantially stoichiometric amount (as herein defined) ; a binder; and a rheology modifier such that the paste has a yield stress sufficient to make the paste self supporting. Preferably, the rheology modifier is a clay. Preferred binders are cellulosic binders . The stoichiometric amount of water is that amount needed to achieve complete rehydration of the plaster from the hemihydrate to the dihydrate, and no more. Preferably, the paste contains only a gypsum plaster. The paste may include an extrusion aid. Preferably, the clay or other rheology modifier is present in an amount up to 20% , preferably of from 10 to 12% for extrusion purposed by weight of plaster. Also according to the second aspect of the invention there is provided a method for making a gypsum plaster paste: mixing α gypsum plaster, water in a substantially stoichiometric amount (as herein defined) and a binder; and mixing into that mixture a rheology modifier such that the paste has a yield stress sufficient to make the paste self supporting. Preferred rheology modifiers are clays.
Preferred cellulosic binders are cellulose ethers; particularly preferred are those having a molecular weight between 12000 and 30000. Other suitable binders include polyvinylalcohol (PVA) and polyethyleneglycol (PEG) , either alone or in combination. Preferably, the binder is present at a level of at least 0.1%, and more preferably at least 1%, by weight. Preferably, the binder is present at a level of no more than 10%, more preferably no more 5%, by weight of plaster.
The binder, preferably a cellulosic binder, is preferably suspended in the water before it is mixed with the gypsum plaster. An extrusion aid may be included in the plaster/water mixture before mixing with the clay.
It is preferred that the water content of the mixture is between 13% and 32% based on the weight of α plaster. This corresponds to between 70% and 170% of the stoichiometric amount. In pastes containing less than the stoichiometric amount of water the unrehydrated plaster acts as a filler; in contrast to other proposed processes using near stoichiometric amounts of water, the water and the unrehydrated plaster is easily dispersed throughout the paste and there is virtually no free water in the paste. It is preferred that a retarder such as diethyl triamine pentacetic acid (DTPA) is employed as a retarder to prevent the paste from setting during processing. Alternatively, elevated temperatures preferably above 60°C can be employed; at such temperatures, the plaster will not set, allowing the mixture to be mixed thoroughly and avoiding the plaster setting in the mixer or elsewhere in the process . A preferred clay is Grolleg English china clay, but other clays may be used; examples of other clays are ball, atapulgous and bentonitic clays. The rheological effect of clays and other rheology modifiers on the paste will differ depending on the type of clay or other modifier employed. Those skilled in the art will be able to select an appropriate clay or other modifier to achieve a desired rheology, using if necessary simple experimentation.
The paste of the invention is particularly suitable for forming into a desired shape by extrusion. Although the paste is self supporting it will normally be necessary to support the formed paste immediately it leaves the die, for example on a moving bel . The extended product can be cut to length before or after setting.
Alternatively, the paste can be formed into product by other plastic forming processes such as pressing, stamping, rolling and injection moulding.
In the context of the present invention, yield stress is the stress which must be exceeded in order to cause measurable flow in the paste. The measured yield stress will be different depending on the processing to which the paste is subjected, such as extrusion or rolling. Yield stress is measured using standard rheological techniques such as by use of a controlled stress rheometer .
It has been found that products made from pastes according to the invention exhibit excellent strength and hardness. Extruded product made from a paste according to the invention can exhibit average flexural strength (measured according to ASTM C78) of 10 to 30 M Pa. This may be due to the excellent rheological properties of the paste allowing formation of a product substantially free of macro defects, especially by extrusion.
The inclusion in the paste of lightweight aggregates, preferably up to 20% by weight of, allows the density of the formed product to be reduced to 1.5 g/ml or lower. Preferred aggregates include lightweight ceramic microspheres , and cenospheres .
Fibres may be added to the paste, preferably up to 10% by weight of plaster. Preferred fibres included glass and polypropylene fibres .
The invention will be further described with reference to the following example:
A pre-gel/suspension was formed by combining:
Parts by Weight
DTPA (setting retarder) 41% solution: 0.66 % methylcellulose (Methocel A4M) : 3.18 % water: 96.16 %
The pre-gel/suspension was used to make the following composition:
Parts by Weight α gypsum plaster: 84.28 % pre-ge1/suspension 15.6 %
DTPA (setting retarder) 41% solution 0.12 %
This composition was mixed in a Z-blade mixer at ambient temperature for about 4 minutes. To this composition was added 9.82% by weight of the total mixture Grolleg English china clay and the resulting mixture was mixed for a further 3 minutes until the resulting paste was sufficiently plastic to be extruded. The paste was then removed from the mixer and introduced into the pugging section of a Kema extruder. It was then deaired in the vacuum section of the extruder and extruded through a die, the extruded paste being supported on a conveyor as it exited the die. The extruded products were cut to length before they set .
The density of the extruded product was 2.09 g/ml. The Rockwell hardness was 119 and the modulus of rupture 11.5 M Pa. In other examples, a modulus of rupture of up to 25 M Pa has been achieved.

Claims

1. A gypsum plaster paste comprising: gypsum plaster; water in a substantially stoichiometric amount (as herein defined) ; a binder; and a clay or another rheology modifier functionally equivalent to a clay.
2. A gypsum plaster paste comprising: gypsum plaster; water in a substantially stoichiometric amount (as herein defined) ; a binder; and a rheology modifier such that the paste has a yield stress sufficient to make the paste self supporting.
3. A paste according to claim 2 in which the rheology modifier is a clay.
4. A paste according to claim 1 , 2 or 3 in which the rheology modifier is present in an amount of up to 20% weight of plaster.
5. A paste according to any preceding claim in which all the gypsum plaster in the paste is gypsum plaster.
6. A paste according to any preceding claim in which the water is present in an amount of from 70% to 170% of the stoichiometric amount .
7. A paste according to any preceding claim in which the binder is a cellulosic binder.
8. A paste according to any of claims 1 to 6 in which the binder is at least one of polyvinylalcohol and polyethyleneglycol .
9. A paste according to any preceding claim in which the binder is present in an amount of at least 0.1%, preferably at least 1%, by weight.
10. A paste according to any preceding claim in which the binder is present in an amount of no more than 10%, preferably no more than 5%, by weight.
11. A paste according to any preceding claim further comprising any of a setting retarder, lightweight aggregate and fibre .
12. A paste according to claim 11 in which the lightweight aggregate is ceramic microspheres or cenospheres.
13. A paste according to claim 11 or 12 in which the lightweight aggregate is present in an amount of up to 20% by weight .
14. A paste according to claim 11, 12 or 13 in which the fibre is glass or polypropylene fibre.
15. A paste according to claim 11 or 14 in which the fibre is present in an amount of up to 10% by weight.
16. A paste according to any preceding claim containing from 13% to 32% by water by weight of a plaster.
17. A method for making a gypsum plaster paste according to any preceding claim comprising: mixing ╬▒ gypsum plaster, water in a substantially stoichiometric amount (as herein defined) and a binder; and mixing into that mixture a clay or other rheology modifier functionally equivalent to a clay.
18. A method for making gypsum plaster paste according to any of claims 1 to 16 comprising: mixing gypsum plaster, water in a substantially stoichiometric amount (as herein defined) and a binder; and mixing into that mixture a rheology modifier such that the paste has a yield stress sufficient to make the paste self supporting.
19. A method according to claim 18 in which a clay is mixed into the said mixture as the rheology modifier.
20. A method according to claim 17, 18 or 19 further comprising forming a pre-gel/suspension comprising water and binder and adding to that the gypsum plaster.
21. A method according to any of claims 17 to 20 further comprising adding a setting retarder to the composition.
22. A method according to any of claims 17 to 21 carried out at a temperature above 60┬░C.
23. A method according to any of claims 17 to 22 in which the water is added at between 13 and 32% by weight of plaster.
24. A method of forming an extruded gypsum product comprising: forming a paste according to any of claims 1 to 16; working the paste into a plastic condition; and extruding the paste through a die .
8
25. A method according to claim 24 in which the extruded paste is supported as it leaves the die.
26. A method of forming a stamped or pressed gypsum product comprising: forming a paste according to any of claims 1 to 16; working the paste into a plastic condition; and stamping or pressing the paste into a desired shape.
27. A method of forming a rolled gypsum product comprising: forming a paste according to any of claims 1 to 16; working the paste into a plastic condition; and rolling the paste.
28. A method of forming a gypsum product comprising: forming a paste according to any of claims 1 to 16; working the paste into a plastic condition; and injection moulding the paste.
29. A method according to any of claims 24 to 28 in which the paste is made by a method accord-' ng to any of claims 17 to 22.
30. A method according to any of claims 24 to 29 comprising adding a setting retarder to the composition
31. A method according to any of claims 24 to 30 in which the working is done at a temperature above 60┬░C.
32. A gypsum plaster paste made by a method according to claims 17 to 23.
33. An extruded gypsum product made by a method according to any of claims 24 to 31.
34. A set gypsum product made from a paste according to any of claims 1 to 16 and 32.
35. A gypsum plaster paste substantially as described with reference to the example.
36. A method of forming a gypsum plaster paste substantially as described with reference to the example.
37. A method of forming an extruded gypsum product substantially as described with reference to the example.
10
PCT/GB1999/001198 1998-04-20 1999-04-20 Gypsum plaster WO1999054265A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU36157/99A AU3615799A (en) 1998-04-20 1999-04-20 Gypsum plaster
CA002329424A CA2329424A1 (en) 1998-04-20 1999-04-20 Gypsum plaster
EP99918114A EP1080051A1 (en) 1998-04-20 1999-04-20 Gypsum plaster

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9808339A GB2336585B (en) 1998-04-20 1998-04-20 Gypsum plaster
GB9808339.7 1998-04-20

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09673796 A-371-Of-International 2000-12-22
US10/823,783 Continuation US20040258901A1 (en) 1998-04-20 2004-04-14 Gypsum plaster

Publications (1)

Publication Number Publication Date
WO1999054265A1 true WO1999054265A1 (en) 1999-10-28

Family

ID=10830616

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/001198 WO1999054265A1 (en) 1998-04-20 1999-04-20 Gypsum plaster

Country Status (5)

Country Link
EP (1) EP1080051A1 (en)
AU (1) AU3615799A (en)
CA (1) CA2329424A1 (en)
GB (1) GB2336585B (en)
WO (1) WO1999054265A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004043872A2 (en) 2002-11-12 2004-05-27 Innovative Construction And Building Materials Reinforced wallboard
US6743830B2 (en) 2001-03-07 2004-06-01 Innovative Construction And Building Materials Construction board materials with engineered microstructures
US6841232B2 (en) 2002-11-12 2005-01-11 Innovative Construction And Building Materials Reinforced wallboard
US7105587B2 (en) 2001-03-07 2006-09-12 Innovative Construction And Building Materials Method and composition for polymer-reinforced composite cementitious construction material
WO2014138283A1 (en) * 2013-03-05 2014-09-12 Intellectual Gorilla B.V. Extruded gypsum-based materials
WO2015188054A1 (en) * 2014-06-05 2015-12-10 Intellectual Gorilla B.V. Extruded cement based materials

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9908766D0 (en) * 1999-04-17 1999-06-09 Salem Mahmoud Lightweight,insulating and decrative metallic bricks and tiles
US6699426B1 (en) 1999-06-15 2004-03-02 National Gypsum Properties, Llc. Gypsum wallboard core, and method and apparatus for making the same
US7261772B1 (en) * 2006-10-17 2007-08-28 Lyondell Chemical Technology, L.P. Gypsum composition
CN108623276A (en) * 2018-05-24 2018-10-09 合肥美壁宝装饰材料有限公司 A kind of superpower anticracking brushing gypsum and its construction method

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2166536A5 (en) * 1971-12-29 1973-08-17 Pj Maes Gustave Plaster compsn - contg polymeric additive eg polyvinyl acetate or cellulosic
JPS4969734A (en) * 1972-10-25 1974-07-05
DE2528304A1 (en) * 1974-07-01 1976-01-22 Mitsubishi Petrochemical Co PLASTER COMPOSITION
US3947398A (en) * 1971-05-13 1976-03-30 John Williams Surfacing composition containing aqueous resin emulsion and calcium sulfate hemihydrate plaster
GB2048235A (en) * 1979-04-25 1980-12-10 Bpb Industries Ltd Improved Joint Cement
EP0176649A1 (en) * 1984-10-04 1986-04-09 Gips-Union Ag Process for the dry production of gypsum-based construction boards
EP0447232A1 (en) * 1990-03-15 1991-09-18 Plascon Technologies (Proprietary) Limited Composition and method for forming a tile body
US5482551A (en) * 1993-09-20 1996-01-09 Armstrong World Industries, Inc. Extruded fire resistant construction and building products
US5658624A (en) * 1992-08-11 1997-08-19 E. Khashoggi Industries Articles formed by extruding hydraulically settable compositions

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1265471A (en) * 1967-11-23 1972-03-01
GB1390360A (en) * 1971-05-13 1975-04-09 J Williams Plaster composition
US4159302A (en) * 1975-10-14 1979-06-26 Georgia-Pacific Corporation Fire door core

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947398A (en) * 1971-05-13 1976-03-30 John Williams Surfacing composition containing aqueous resin emulsion and calcium sulfate hemihydrate plaster
FR2166536A5 (en) * 1971-12-29 1973-08-17 Pj Maes Gustave Plaster compsn - contg polymeric additive eg polyvinyl acetate or cellulosic
JPS4969734A (en) * 1972-10-25 1974-07-05
DE2528304A1 (en) * 1974-07-01 1976-01-22 Mitsubishi Petrochemical Co PLASTER COMPOSITION
GB2048235A (en) * 1979-04-25 1980-12-10 Bpb Industries Ltd Improved Joint Cement
EP0176649A1 (en) * 1984-10-04 1986-04-09 Gips-Union Ag Process for the dry production of gypsum-based construction boards
EP0447232A1 (en) * 1990-03-15 1991-09-18 Plascon Technologies (Proprietary) Limited Composition and method for forming a tile body
US5658624A (en) * 1992-08-11 1997-08-19 E. Khashoggi Industries Articles formed by extruding hydraulically settable compositions
US5482551A (en) * 1993-09-20 1996-01-09 Armstrong World Industries, Inc. Extruded fire resistant construction and building products

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 82, no. 4, 27 January 1975, Columbus, Ohio, US; abstract no. 21125c, T. YANO ET AL. page 297; XP000152136 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6743830B2 (en) 2001-03-07 2004-06-01 Innovative Construction And Building Materials Construction board materials with engineered microstructures
US7105587B2 (en) 2001-03-07 2006-09-12 Innovative Construction And Building Materials Method and composition for polymer-reinforced composite cementitious construction material
WO2004043872A2 (en) 2002-11-12 2004-05-27 Innovative Construction And Building Materials Reinforced wallboard
US6841232B2 (en) 2002-11-12 2005-01-11 Innovative Construction And Building Materials Reinforced wallboard
US6902797B2 (en) 2002-11-12 2005-06-07 Innovative Construction And Building Materials Gypsum-based composite materials reinforced by cellulose ethers
WO2014138283A1 (en) * 2013-03-05 2014-09-12 Intellectual Gorilla B.V. Extruded gypsum-based materials
WO2015188054A1 (en) * 2014-06-05 2015-12-10 Intellectual Gorilla B.V. Extruded cement based materials

Also Published As

Publication number Publication date
GB9808339D0 (en) 1998-06-17
CA2329424A1 (en) 1999-10-28
GB2336585B (en) 2002-06-26
AU3615799A (en) 1999-11-08
EP1080051A1 (en) 2001-03-07
GB2336585A8 (en) 1999-11-15
GB2336585A (en) 1999-10-27

Similar Documents

Publication Publication Date Title
CA2505594C (en) Reinforced wallboard
CN100352785C (en) Reinforced wallboard
EP0068741B1 (en) Boards and sheets
US5482551A (en) Extruded fire resistant construction and building products
KR101373197B1 (en) Lightweight plasterboard and plaster slurry composition used for its manufacture
US20040258901A1 (en) Gypsum plaster
EP0179775A1 (en) Light ceramic material for building, method to manufacture such material and utilization thereof.
EP1080051A1 (en) Gypsum plaster
EP1831128A1 (en) Shaped concrete body
JP2003508328A (en) Extrudable cement material
JPS60176978A (en) Manufacture of high strength cement product
EP2361264B1 (en) Gypsum based formulations
JPH0143701B2 (en)
JPS58140355A (en) Manufacture of cementitious formed body
JPH04300232A (en) Composite gypsum board and its production
JPH03153551A (en) Method for extrusion-molding inorganic sheet
US2292011A (en) Process for the preparation of lightweight products
JPH0547496B2 (en)
RU2039021C1 (en) Method of manufacture of construction structures
JP4556016B2 (en) Energy-saving manufacturing method and molded body of ceramic-based molded body
AU781383B2 (en) Extrudable cementitious material
JP2000044321A (en) Inorganic hardened body and its production
GB2105636A (en) Boards and sheets
JPH0735271B2 (en) Manufacturing method of slag cement extrusion
JPH0631182B2 (en) Manufacturing method of lightweight inorganic extrusion products

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 138874

Country of ref document: IL

ENP Entry into the national phase

Ref document number: 2329424

Country of ref document: CA

NENP Non-entry into the national phase

Ref country code: KR

WWE Wipo information: entry into national phase

Ref document number: 1999918114

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 09673796

Country of ref document: US

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: 1999918114

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1999918114

Country of ref document: EP