CA1319883C - Weather-resistant lignocellulose or other organic or inorganic material boards and process for their production - Google Patents
Weather-resistant lignocellulose or other organic or inorganic material boards and process for their productionInfo
- Publication number
- CA1319883C CA1319883C CA000492093A CA492093A CA1319883C CA 1319883 C CA1319883 C CA 1319883C CA 000492093 A CA000492093 A CA 000492093A CA 492093 A CA492093 A CA 492093A CA 1319883 C CA1319883 C CA 1319883C
- Authority
- CA
- Canada
- Prior art keywords
- base material
- weather
- resistant
- vulcanized
- board
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0078—Measures or configurations for obtaining anchoring effects in the contact areas between layers
- B29C37/0082—Mechanical anchoring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
- B32B19/02—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica the layer of fibres or particles being impregnated or embedded in a plastic substance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B21/08—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/4857—Other macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B41/4861—Polyalkenes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
Abstract
ABSTRACT OF THE DISCLOSURE
Weather-resistant boards (for instance, particle boards, facade covering boards, and wall elements) and mouldings (for instance, containers, vessels, prefabricated building elements, and roof elements), are provided herein which are possessed of surface elasticity and pliancy by means of a permanently-elastic, covering layer. The base material is (a) an impregnatable porous base material, e.g. (i) a lignocellulose or other organic fibrous or particle material, or (ii) an inorganic fibrous or particle material; and (b) a vulcanized weather-resistant, outer resilient synthetic elastomeric material covering layer which has been vulcanized thereon in-situ at a temperature of at least 175°C. The vulcanized outer covering layer is bound to and is both adhered securely to one outer surface of the base material, and, when in unvulcanized form, has been penetrated into and impregnated below and into the same outer surface of the base material to be within the porous structure of the base material for only a predetermined limited region in the vicinity of the outer surface of the base material. Such weather resistant boards therefore consist of three layers. The first layer is an impregnatable porous, base material as defined above. The second layer is a vulcanized weather-resistant outer resilient synthetic elastomeric material covering.
The third layer is the outer originally unvulcanized, resilient synthetic elastomeric material, which is penetrated and impregnated below and into the same outer surface of the base material to be within the porous structure of the base material and which is vulcanized therein in-situ. The board is an integral united material of the above-mentioned three layers.
Weather-resistant boards (for instance, particle boards, facade covering boards, and wall elements) and mouldings (for instance, containers, vessels, prefabricated building elements, and roof elements), are provided herein which are possessed of surface elasticity and pliancy by means of a permanently-elastic, covering layer. The base material is (a) an impregnatable porous base material, e.g. (i) a lignocellulose or other organic fibrous or particle material, or (ii) an inorganic fibrous or particle material; and (b) a vulcanized weather-resistant, outer resilient synthetic elastomeric material covering layer which has been vulcanized thereon in-situ at a temperature of at least 175°C. The vulcanized outer covering layer is bound to and is both adhered securely to one outer surface of the base material, and, when in unvulcanized form, has been penetrated into and impregnated below and into the same outer surface of the base material to be within the porous structure of the base material for only a predetermined limited region in the vicinity of the outer surface of the base material. Such weather resistant boards therefore consist of three layers. The first layer is an impregnatable porous, base material as defined above. The second layer is a vulcanized weather-resistant outer resilient synthetic elastomeric material covering.
The third layer is the outer originally unvulcanized, resilient synthetic elastomeric material, which is penetrated and impregnated below and into the same outer surface of the base material to be within the porous structure of the base material and which is vulcanized therein in-situ. The board is an integral united material of the above-mentioned three layers.
Description
This invention relates to a method for the production of weather-resistant boards and to the weather-resi~tant boards so produced. Thi~ application is relat:ed to applicant's copending application Serial No. 477,622.
Many wood fibre materials for the building industry are limited to interior use since they are not sufficiently weather resistant to be used externally. However, since these products, i.e., particle boards, fibre boards, insulating boards, plywood, etc. are considered to be ideal and inexpensive building material~ because of their economy, their insulation properties and their lightness, the art has been Eaced with the problem of providing the necessary weather resistancy and aging stability by altering the nature and composition of the raw materials and binding agents ax well as by applying a coating to the outer skin. The fir~t aim is not; only to prevent water from penetrating into the board, but also to keep off atmospheric humidity. Any attempts to solve this problem solely by the type of and modification of, the usual glue mixtures, and by adding hydrophobic agents and/or antibacterial agents, have not provided any reliable results, since it was also desired that the positive propertie~ of the material, e.g. low costs, light weight, heat insulation, bursting strength and standard gluing, be retained.
Such properties are impaired when, for instance, too large quantitie~ of binding materials or mineral admixtures are used, which were expedient~ recently attempted to achieve suEficient weather re~istancy. Therefore, measures heretofore used to ~ J
~, 131988;~
provide such weather resistance o~ the structural composition within limits are coupled with an effective surface protection.
Accordingly, up to the pre~ent time, neither materials nor methods have been found which would guarantee that the required long lasting protection would remain effective against atmospheric influences to maintain the board resistant to mech-anical damage or destruction within an acceptable economic scope. In this re6pect, coating the board by liquid preserving agent~ is becoming more obsolete, since the industry has been successful in developing products which have high resistance to moisture, W radiation and heat radiation, etc. and which avoids to a large extent cracking or embrittlement. Another economic process has been provided in which synthetic-resin-soaked papers are pressed on during the standard prod-uction of boards or mouldings. Thi6, however, results in thin and susceptible surface coatings which are liable to crack because of the brittleness of the material as soon as the base material expands. This danger would be overcome by laminating previously produced weather-resistant, impact-resistant, and crack resistant materials, e.g., sheet metals, asbestos cement, or synthetic foils to the board. These, however, might peel off under the permanent strain of and influence of the weather as the differences of the expansion-coefficients due to heat radiation result in the destruction of the glue joint and cause blistering.
Many proposals have been made to solve such problems.
For example, Harvey et al, U.S. Patent No. 1,776,790, patented Seetember 30, L930: Clements, U.S. Patent 2,402,731, ~atented June 25, 1946; Page, U.S. Patent 2,694,233, patented November 16, 1954: Elmsdorf, U.S. Patent 3,332,193, patented July 25, 1967; and Tellman, U.S. Patent 4,190,041, patented Augu6t 22, 1978 all show various suggestions in the prior art which have not solved the problem.
Steobel, U.S. Patent 1,955,984, patented August 24, 1934, taught a weatherproof board having an integrated fibrous material base, an intermediate resilient layer secured only to the outer face of the base, and a facing of vulcanized rubber secured only to the intermediate layer.
Flanders, U.S. Patent 4,127,636 patented November 28, 1978 provided a reinforced board made of lignocellulose particle~ in which lignocellulose fibres were first mixed with short fibres (to cause randem orientation) with a binder and with a wax addition and finally with reinforcing filaments (e.g. glass fibre or steel wires). Then the entire mixture was is moulded under pcessure.
McTague, U.S. Patent 2,125,847 provided a moulded laminated article including pre-formed lamina of high re6in content fibre board integrally united to a pre-formed lamina of a composition comprising a halogen - containing rubber derivative, e.g. a sunlight embrittling composition Accordingly, up to the present time, no method exists for coating the surface of wood-fibre materials, plywood materials or other fibre materials, even those which have previously been made moisture resistant to the greatest possible extent, with an insoluble layer.
Thus, aims of the present invention are to provide such a building board which is economical to produce; which is resistant to weather influences; which is substantially non-ageing; which can follow all fluctuations of the base material without significant embrittling or cracking; which shows high abrasion-resistance;
which has impact resistant capacities to mechanical influences of any kind; and which has been made substantially non-inflammable, if required.
This invention provides, in one aspect, a weather-resistant board possessed of surface elasticity and pliancy by means of a lS permanently-elastic covering layer comprising: (a~ an impregnatable porous base material selected from the group consisting of ~i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic fibrous or particle material; and (b) a vulcanized outer covering layer constituted by a vulcanized, weather-resistant, resilient, synthetic elastomeric material whlch has been vulcanized therein ln-situ at a temperature of at least 175C.; the vulcanized outer covering layer being bound to and both adhered securely to one outer surface of the base material, and, when in unvulcanized form, being penetrated into and impregnated 2~ below and into the same outer surface of the base material to be within the porous structure of the base material or or,ly a predetermined limited region in the ~-iclnity of the outer sllrface ,.
of the base material, and being vulcanized therein in situ at the temperature of at least 175C. to be bound thereto for only the predetermined limited region.
The base material in one variant may be a batt of a lignocellulose or other organic material, which may be in fibrous or particle form, and preferably may be in the form of fibres, chips or particles of wood or other plants. Alternatively, in another variant, the base material may be a batt of an inorganic mineral material, which may be in fibrous or particle form, and preferably may be in the form of mineral wool, glass wool, glass fibres, or synthetic fibres.
In another variant of this embodiment of the invention, the vulcanized outer covering layer may be adhered to two mutually opposed faces thereof. Alternatively, in yet another variant, the outer material may completely encase the board.
The resilient synthetic material is preferably a vulcanizable rubber. The vulcanized outer covering layer may be provided with a further surface coating, e.g. of powder, of aluminum foil or of colour pigments, or it may be in the form of a relief ornamental structure.
The weather-resistant board preferably is in heat pressed form, e.g. it may be in a flat form or it may be in a shaped, moulded form. The board m~y be moulded by bending, whereby the elasticity and flexibility of the outer skin takes over the function of a hirlge. The board may alternatively be formed as a wall, a roof, or as other building elements, with openings herein for doors and/or windows. Still further, it may be formed as vessels or containers.
This invention provides, in another aspect a method for preparing a weather-resistant board comprising one of the following two procedures, namely (A) (a) laying down an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic mineral fibrous or particle material; the batt including 2 binder material associated therewith, (b) laying down thereon a vulcanizable, weather-resistant elastomer material, thereby to provide a composite; and (c) compressing the composite under conditions of high pressure and a temperature of at least 175C.; whereby the outer material is converted to vulcanized form and is bound to and is both adhered to one surface of the base material and is penetrated into and impregnated into the surface of the base material and is bound thereto for only a predetermined limited region in the vicinity of the outer surface of the base material and being vulcanized therein in situ; or (B) (a) laying down a vulcanizable, weather-resistant elastomeric material on a movable charging platform, (b) laying down thereon an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic mineral fibrous or particle material; on the vulcanizable weather-resistant elastomeric material which had been laid down on the movable charging platform as a pre-formed batt, the batt including a binder material associated therewith, thereby to provide a composite; and (c) compressing the composite under conditions of high pressure and a tempera~ure of at least 175C.;
whereby the outer material is converted to vulcanized form and is bound to and is both adhered to one surface of the base material and is penetrated into and impregnated into the surface of the base material and is bound thereto for only a predetermined limited region in the vicinity of the outer surface of the base material and being vulcanized therein in situ.
131 9~83 The base material may either be laid down directly on the movable charging platform or, e.g., as a pre-formed batt of fibres, chips or particles of wood or other plants or it may be laid down as a pre-formed batt directly on the movable charging platform.
Alternativel~, the base material may be laid down as a pre-formed batt on a layer of the vulcanizable rubber which had previously been laid down on the movable charging platform.
The method may also include the preliminary step of laying down a first layer of parting material on the movable charging platform, and/or the step of further pressing the laid-down pre-formed batt of the base material.
As noted above, the provision of weather-resistant boards or mouldings of particle board, fibre board or plywood materials according to aspects of this invention is based on the fact that, for a long time, natural rubber has proved to be reliable as a weather- and moisture-resistant coating material. The natural rubber which was originally used in the prior art is, according to preferred aspects of the present invention, replaced by synthetic rubbers, thus improving the application properties.
According to the known prior art, by adding stabilizing agents and further additives to the synthetic rubber, the brittleness and cracking under the influence of rain, ozone, light radiation, UV radiation and heat radiation has been substantially reduced so that today, for instance, roof films of synthetic rubber are g e~pected to last 50 years without any damage. Thus, the highly useful properties of the group of synthetic elastomers especially with regard to elasticity, and/or abrasion resistance may be modified beyond their specific characteristics by altering the chemical composition and the type or quantity of added filling materials.
The outer coating of the particle board first of all has to meet the condition of protecting against destructive weather influences and rnechanical damages. A double-faced coating can be provided for higher surface stability, or it may provide a hinge or protecting edges. The synthetic rubber should have the usual expansion characteristics of shrinkage without cracking.
Therefore, a viscous synthetic rubber composition can be used, which will result in a protection layer of optimum impact resistance and abrasion resistance after the completion of the full vulcanization method of aspects of this invention.
Furthermore, such synthetic rubber composition may be reinforced by wood shearing fleece, and other tissue, as well as with admixtures of other fibres and/or other metallic fibres.
The essence of the present invention, however, does not rely only on the use of highly weather-resistant synthetic rubber mixtures for the outer coating. The essence of this invention is the fact that this coating penetrates into and is bound to the base material and thus results in an insoluble composition during the first and only production run. These weather-resistant - 10 _ 13198~3 boards or mouldings are in the form of a compound laminated material, ready for any use as wall elements or roof elements in the building industry, the boards being protected on one or several sides or even edge protected. They may also be formed into pressed containers or vessels suitable to keep and to transport therein liquids or other wet materials.
The method for the manufacture of these weather resistant boards or mouldings of the above described fibrous and/or particle materials according to aspects of this invention is based on the inter-relationship of the two following procedures, under interacting conditions, so that they are carried out substantially simultaneously:
1. Compressing of the fibrous and/or particle mixture of the base material which contains binder materials; and 2. Compressing and vulcanizing of the cover layer or layers coated with a mixture of synthetic rubber, or other elastomers, which elastomers may contain suitable filling materials or binders, or admixtures of such elastomers.
The vulcanization of the rubber and the condensation and tempering or hardening of any resins and/or adhesive agents which may optionally be added to the synthetic rubber takes place under suitable conditions of pressure, temperature (175 C) and time.
The duration of time at the vulcanizing temperature is dependent on accelerators and filling materials which may be present, and the thickness of the synthetic rubber coating. These all vary and can be adjusted to the hardening period of the filling materials. The ~rulcanizing steps for the covering layers or layers on the one hand and the compressing of the base materials on the other hand, should be synchronized so that both procedures are carried out substantially simultaneously. Both material components are put into the shaping heat press tools together and in the selected order to match the structure of the finished compound material and are processed in one and the same manufacturing run to the final board-like compound material or mouldings with weather resistant outer skins. For this method, the same tools and plant installations can be used as are required or as are already available for the production of customary particle boards or mouldings.
In order to obtain an ordinary one-sided weather-resistant coated particle board, for instance in one specific embodiment, the outer coating is generally applied by spraying the synthetic rubber composition onto the batt of the fibres and/or particles.
The outer coating can be supplied either in pre-fabricated unvulcanized films, or built up as successive layers by mechanically spraying, pouring, sprinkling and so forth, in the required quantity. After laying down of the outer coating on the batt and, if desired slightly pre-compressing it, the heat pressing follows and the further processing in the usual manner for the production of particle boards.
Of course, the method described herein may be carried out in a different sequence and with a different number and quantity of ingredients used, so that, for instance, the weather resistant 131 9~8~
-- 1, --cover layer, which is to be vulcanized, is coated or applied on last and on top of and/or on both sides respectively. Further-more, the batt of fibres and/or particles, and binder materials with or without additional heat, may undergo a separate precom-pression step, primarily in order to pre-press a moulding before the outer coating is put on and the final pressing follows.
Finally, according to further features of this invention, a decorating, reflecting or other surface coating or texture can be vulcanized onto the weather-resistant board. For instance, aluminum powder or foil, or colour pigments may be used either at the beginning or the end of the coating procedure and may be incorporated into the method. The weather-resistant surface may be given a relief ornamental structure provided the pressing tools have been fitted out accordingly.
This weather-resistant coating provided by vulcanization is not limited to compound materials or fibre, or particle-like base materials, since it may be used for plywood or wooden strip boards and in principle also on several outer surfaces and even only partly on the surface. Finally, also other lignocellulose-containing or other organic or inorganic, for example, mineral-containing base materials may be used in aspects of the present invention provided they can receive a weather-resistant outer coating of unvulcanized synthetic rubber or other elastomers and may be manufactured into boards or mouldings.
1~19~
In the accompanying drawings, Figure 1 is a section of two forms of weather resistant boards of embodiments of this invention;
Figure 2 is a section of a board of an embodimen-t of this invention in the form of a facia board;
Figure 3 is a section of a board of two other embodiments of this invention in the form of shaped vessels;
Figure 4 is a section of a board of another embodiment of this invention including a window opening therein;
Figure 5 is a schematic flow diagram illustrating the method of producing the board according to one embodiment of this invention; and Figure 6 is a schematic flow diagram illustrating the method of producing the board according to another embodiment of this invention.
As seen in Figure 1, the left hand side shows, in cross-section, an upper-coated weather-resistant board while the right hand side shows in cross-section, a double-faced coated weather resistant board. The base material 1 comprises lignocellulose-containing fibres and/or particles and/or the mineral-containing fibres, and the outer coating 2 comprises a weather-resistant, vulcanizable synthetic rubber mixture. The outer coating 2 is both adhered to the outer surface of the base material 1 and penetrates and impregnates into the base material 1 at the region 3, i.e. for only a predetermined limited region in the vicinity of the outer surface 2 of the base material 1. Thus, the 131~
weather-resistant board comprises an integral uniting of the base material 1 and the synthetic rubber coating 2 which is bound to and is penetrated into and impregnated into the surface of the base material and is bound thereto for only a predetermined limited region in the vicinity of the outer surface of the base after the synthetic rubber coating 2 has been vulcanized.
Figure 2 shows, in cross-section, the weather-resistant board of one embodiment of this invention in the form of a base material 1 and a vulcanized outer synthetic rubber layer 2. The board is shown as being bent completely around (at the right hand side) so that the outer synthetic rubber layer 2 extends around the side edges and portion of the bottom. The elasticity of the outer synthetic rubber layer 2 enables the corners 4 to act as hinges.
On the left hand side, the board is shown as being bent to form a step, with the elasticity of the synthetic rubber outer coating 2 enabling the outer and inner corners 4 to act as hinges. If necessary, a wooden slat 5 can be secured to the inner face behind the step.
In Figure 3, a pre-molded vessel having the cross-section of a bottom 15, side walls 16 and a rim 17 is provided, which is formed of the single-faced board consisting of the base material 1 and the outer coating 2 (shown on the left hand side), or alternatively of the double-faced board consisting of the base material 1 and the outer synthetic rubber coatings 2 (shown on the right hand si~e). ~fter or durlng the moulding operation, the rubber surface 2 is ~-ulcanized as previously described.
The board ln Figure 4 is shown in the forrn of a pre-moulded prefabricated building element for use in a wall having a profile consisting of main wall portion 18, edge portion 19 and a window opening 20.
Figure 5 provides a depiction of one method for the manufacture of weather-resistant boards and mouldings according to an embodiment of this invention. A parting agent ~e.g. talc in powdered form) is first applied, as by spraying, onto the charging platform 10. Then a granulated mixture of the unvul-canized synthetic rubber 7 is applied, and finally a mixture of fibres and/or particle materials 8 is applied thereon, to provide a batt 9, having an unvulcanized synthetic rubber film 7a on one face thereof. The batt 9 is subjected to compression and heat (to at least 175 C.) on the hot press 12. This provides a simultaneous compression of the batt and a vulcanization of the weather-resistant vulcanizable outer synthetic rubber coating 2.
The outer synthetic rubber coating 2 penetrates and is impreg-nated into the base material 1 as previously described and this results in the integrated, united board as described in Figure 1.
Figure 6 shows another aspect of an alternative manufac-turing method of this invention. Here the parting agent 6 is first sprayed onto the charging platform 10. Then the fibres and/or particle material mixture 8 is applied to form a batt 9.
- l~b -Finally the outer synthetlc rubber coating is applied in the form of an unvulcanized film of rlbber 11. The further processing is the same as described for Figure 5.
Many wood fibre materials for the building industry are limited to interior use since they are not sufficiently weather resistant to be used externally. However, since these products, i.e., particle boards, fibre boards, insulating boards, plywood, etc. are considered to be ideal and inexpensive building material~ because of their economy, their insulation properties and their lightness, the art has been Eaced with the problem of providing the necessary weather resistancy and aging stability by altering the nature and composition of the raw materials and binding agents ax well as by applying a coating to the outer skin. The fir~t aim is not; only to prevent water from penetrating into the board, but also to keep off atmospheric humidity. Any attempts to solve this problem solely by the type of and modification of, the usual glue mixtures, and by adding hydrophobic agents and/or antibacterial agents, have not provided any reliable results, since it was also desired that the positive propertie~ of the material, e.g. low costs, light weight, heat insulation, bursting strength and standard gluing, be retained.
Such properties are impaired when, for instance, too large quantitie~ of binding materials or mineral admixtures are used, which were expedient~ recently attempted to achieve suEficient weather re~istancy. Therefore, measures heretofore used to ~ J
~, 131988;~
provide such weather resistance o~ the structural composition within limits are coupled with an effective surface protection.
Accordingly, up to the pre~ent time, neither materials nor methods have been found which would guarantee that the required long lasting protection would remain effective against atmospheric influences to maintain the board resistant to mech-anical damage or destruction within an acceptable economic scope. In this re6pect, coating the board by liquid preserving agent~ is becoming more obsolete, since the industry has been successful in developing products which have high resistance to moisture, W radiation and heat radiation, etc. and which avoids to a large extent cracking or embrittlement. Another economic process has been provided in which synthetic-resin-soaked papers are pressed on during the standard prod-uction of boards or mouldings. Thi6, however, results in thin and susceptible surface coatings which are liable to crack because of the brittleness of the material as soon as the base material expands. This danger would be overcome by laminating previously produced weather-resistant, impact-resistant, and crack resistant materials, e.g., sheet metals, asbestos cement, or synthetic foils to the board. These, however, might peel off under the permanent strain of and influence of the weather as the differences of the expansion-coefficients due to heat radiation result in the destruction of the glue joint and cause blistering.
Many proposals have been made to solve such problems.
For example, Harvey et al, U.S. Patent No. 1,776,790, patented Seetember 30, L930: Clements, U.S. Patent 2,402,731, ~atented June 25, 1946; Page, U.S. Patent 2,694,233, patented November 16, 1954: Elmsdorf, U.S. Patent 3,332,193, patented July 25, 1967; and Tellman, U.S. Patent 4,190,041, patented Augu6t 22, 1978 all show various suggestions in the prior art which have not solved the problem.
Steobel, U.S. Patent 1,955,984, patented August 24, 1934, taught a weatherproof board having an integrated fibrous material base, an intermediate resilient layer secured only to the outer face of the base, and a facing of vulcanized rubber secured only to the intermediate layer.
Flanders, U.S. Patent 4,127,636 patented November 28, 1978 provided a reinforced board made of lignocellulose particle~ in which lignocellulose fibres were first mixed with short fibres (to cause randem orientation) with a binder and with a wax addition and finally with reinforcing filaments (e.g. glass fibre or steel wires). Then the entire mixture was is moulded under pcessure.
McTague, U.S. Patent 2,125,847 provided a moulded laminated article including pre-formed lamina of high re6in content fibre board integrally united to a pre-formed lamina of a composition comprising a halogen - containing rubber derivative, e.g. a sunlight embrittling composition Accordingly, up to the present time, no method exists for coating the surface of wood-fibre materials, plywood materials or other fibre materials, even those which have previously been made moisture resistant to the greatest possible extent, with an insoluble layer.
Thus, aims of the present invention are to provide such a building board which is economical to produce; which is resistant to weather influences; which is substantially non-ageing; which can follow all fluctuations of the base material without significant embrittling or cracking; which shows high abrasion-resistance;
which has impact resistant capacities to mechanical influences of any kind; and which has been made substantially non-inflammable, if required.
This invention provides, in one aspect, a weather-resistant board possessed of surface elasticity and pliancy by means of a lS permanently-elastic covering layer comprising: (a~ an impregnatable porous base material selected from the group consisting of ~i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic fibrous or particle material; and (b) a vulcanized outer covering layer constituted by a vulcanized, weather-resistant, resilient, synthetic elastomeric material whlch has been vulcanized therein ln-situ at a temperature of at least 175C.; the vulcanized outer covering layer being bound to and both adhered securely to one outer surface of the base material, and, when in unvulcanized form, being penetrated into and impregnated 2~ below and into the same outer surface of the base material to be within the porous structure of the base material or or,ly a predetermined limited region in the ~-iclnity of the outer sllrface ,.
of the base material, and being vulcanized therein in situ at the temperature of at least 175C. to be bound thereto for only the predetermined limited region.
The base material in one variant may be a batt of a lignocellulose or other organic material, which may be in fibrous or particle form, and preferably may be in the form of fibres, chips or particles of wood or other plants. Alternatively, in another variant, the base material may be a batt of an inorganic mineral material, which may be in fibrous or particle form, and preferably may be in the form of mineral wool, glass wool, glass fibres, or synthetic fibres.
In another variant of this embodiment of the invention, the vulcanized outer covering layer may be adhered to two mutually opposed faces thereof. Alternatively, in yet another variant, the outer material may completely encase the board.
The resilient synthetic material is preferably a vulcanizable rubber. The vulcanized outer covering layer may be provided with a further surface coating, e.g. of powder, of aluminum foil or of colour pigments, or it may be in the form of a relief ornamental structure.
The weather-resistant board preferably is in heat pressed form, e.g. it may be in a flat form or it may be in a shaped, moulded form. The board m~y be moulded by bending, whereby the elasticity and flexibility of the outer skin takes over the function of a hirlge. The board may alternatively be formed as a wall, a roof, or as other building elements, with openings herein for doors and/or windows. Still further, it may be formed as vessels or containers.
This invention provides, in another aspect a method for preparing a weather-resistant board comprising one of the following two procedures, namely (A) (a) laying down an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic mineral fibrous or particle material; the batt including 2 binder material associated therewith, (b) laying down thereon a vulcanizable, weather-resistant elastomer material, thereby to provide a composite; and (c) compressing the composite under conditions of high pressure and a temperature of at least 175C.; whereby the outer material is converted to vulcanized form and is bound to and is both adhered to one surface of the base material and is penetrated into and impregnated into the surface of the base material and is bound thereto for only a predetermined limited region in the vicinity of the outer surface of the base material and being vulcanized therein in situ; or (B) (a) laying down a vulcanizable, weather-resistant elastomeric material on a movable charging platform, (b) laying down thereon an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic mineral fibrous or particle material; on the vulcanizable weather-resistant elastomeric material which had been laid down on the movable charging platform as a pre-formed batt, the batt including a binder material associated therewith, thereby to provide a composite; and (c) compressing the composite under conditions of high pressure and a tempera~ure of at least 175C.;
whereby the outer material is converted to vulcanized form and is bound to and is both adhered to one surface of the base material and is penetrated into and impregnated into the surface of the base material and is bound thereto for only a predetermined limited region in the vicinity of the outer surface of the base material and being vulcanized therein in situ.
131 9~83 The base material may either be laid down directly on the movable charging platform or, e.g., as a pre-formed batt of fibres, chips or particles of wood or other plants or it may be laid down as a pre-formed batt directly on the movable charging platform.
Alternativel~, the base material may be laid down as a pre-formed batt on a layer of the vulcanizable rubber which had previously been laid down on the movable charging platform.
The method may also include the preliminary step of laying down a first layer of parting material on the movable charging platform, and/or the step of further pressing the laid-down pre-formed batt of the base material.
As noted above, the provision of weather-resistant boards or mouldings of particle board, fibre board or plywood materials according to aspects of this invention is based on the fact that, for a long time, natural rubber has proved to be reliable as a weather- and moisture-resistant coating material. The natural rubber which was originally used in the prior art is, according to preferred aspects of the present invention, replaced by synthetic rubbers, thus improving the application properties.
According to the known prior art, by adding stabilizing agents and further additives to the synthetic rubber, the brittleness and cracking under the influence of rain, ozone, light radiation, UV radiation and heat radiation has been substantially reduced so that today, for instance, roof films of synthetic rubber are g e~pected to last 50 years without any damage. Thus, the highly useful properties of the group of synthetic elastomers especially with regard to elasticity, and/or abrasion resistance may be modified beyond their specific characteristics by altering the chemical composition and the type or quantity of added filling materials.
The outer coating of the particle board first of all has to meet the condition of protecting against destructive weather influences and rnechanical damages. A double-faced coating can be provided for higher surface stability, or it may provide a hinge or protecting edges. The synthetic rubber should have the usual expansion characteristics of shrinkage without cracking.
Therefore, a viscous synthetic rubber composition can be used, which will result in a protection layer of optimum impact resistance and abrasion resistance after the completion of the full vulcanization method of aspects of this invention.
Furthermore, such synthetic rubber composition may be reinforced by wood shearing fleece, and other tissue, as well as with admixtures of other fibres and/or other metallic fibres.
The essence of the present invention, however, does not rely only on the use of highly weather-resistant synthetic rubber mixtures for the outer coating. The essence of this invention is the fact that this coating penetrates into and is bound to the base material and thus results in an insoluble composition during the first and only production run. These weather-resistant - 10 _ 13198~3 boards or mouldings are in the form of a compound laminated material, ready for any use as wall elements or roof elements in the building industry, the boards being protected on one or several sides or even edge protected. They may also be formed into pressed containers or vessels suitable to keep and to transport therein liquids or other wet materials.
The method for the manufacture of these weather resistant boards or mouldings of the above described fibrous and/or particle materials according to aspects of this invention is based on the inter-relationship of the two following procedures, under interacting conditions, so that they are carried out substantially simultaneously:
1. Compressing of the fibrous and/or particle mixture of the base material which contains binder materials; and 2. Compressing and vulcanizing of the cover layer or layers coated with a mixture of synthetic rubber, or other elastomers, which elastomers may contain suitable filling materials or binders, or admixtures of such elastomers.
The vulcanization of the rubber and the condensation and tempering or hardening of any resins and/or adhesive agents which may optionally be added to the synthetic rubber takes place under suitable conditions of pressure, temperature (175 C) and time.
The duration of time at the vulcanizing temperature is dependent on accelerators and filling materials which may be present, and the thickness of the synthetic rubber coating. These all vary and can be adjusted to the hardening period of the filling materials. The ~rulcanizing steps for the covering layers or layers on the one hand and the compressing of the base materials on the other hand, should be synchronized so that both procedures are carried out substantially simultaneously. Both material components are put into the shaping heat press tools together and in the selected order to match the structure of the finished compound material and are processed in one and the same manufacturing run to the final board-like compound material or mouldings with weather resistant outer skins. For this method, the same tools and plant installations can be used as are required or as are already available for the production of customary particle boards or mouldings.
In order to obtain an ordinary one-sided weather-resistant coated particle board, for instance in one specific embodiment, the outer coating is generally applied by spraying the synthetic rubber composition onto the batt of the fibres and/or particles.
The outer coating can be supplied either in pre-fabricated unvulcanized films, or built up as successive layers by mechanically spraying, pouring, sprinkling and so forth, in the required quantity. After laying down of the outer coating on the batt and, if desired slightly pre-compressing it, the heat pressing follows and the further processing in the usual manner for the production of particle boards.
Of course, the method described herein may be carried out in a different sequence and with a different number and quantity of ingredients used, so that, for instance, the weather resistant 131 9~8~
-- 1, --cover layer, which is to be vulcanized, is coated or applied on last and on top of and/or on both sides respectively. Further-more, the batt of fibres and/or particles, and binder materials with or without additional heat, may undergo a separate precom-pression step, primarily in order to pre-press a moulding before the outer coating is put on and the final pressing follows.
Finally, according to further features of this invention, a decorating, reflecting or other surface coating or texture can be vulcanized onto the weather-resistant board. For instance, aluminum powder or foil, or colour pigments may be used either at the beginning or the end of the coating procedure and may be incorporated into the method. The weather-resistant surface may be given a relief ornamental structure provided the pressing tools have been fitted out accordingly.
This weather-resistant coating provided by vulcanization is not limited to compound materials or fibre, or particle-like base materials, since it may be used for plywood or wooden strip boards and in principle also on several outer surfaces and even only partly on the surface. Finally, also other lignocellulose-containing or other organic or inorganic, for example, mineral-containing base materials may be used in aspects of the present invention provided they can receive a weather-resistant outer coating of unvulcanized synthetic rubber or other elastomers and may be manufactured into boards or mouldings.
1~19~
In the accompanying drawings, Figure 1 is a section of two forms of weather resistant boards of embodiments of this invention;
Figure 2 is a section of a board of an embodimen-t of this invention in the form of a facia board;
Figure 3 is a section of a board of two other embodiments of this invention in the form of shaped vessels;
Figure 4 is a section of a board of another embodiment of this invention including a window opening therein;
Figure 5 is a schematic flow diagram illustrating the method of producing the board according to one embodiment of this invention; and Figure 6 is a schematic flow diagram illustrating the method of producing the board according to another embodiment of this invention.
As seen in Figure 1, the left hand side shows, in cross-section, an upper-coated weather-resistant board while the right hand side shows in cross-section, a double-faced coated weather resistant board. The base material 1 comprises lignocellulose-containing fibres and/or particles and/or the mineral-containing fibres, and the outer coating 2 comprises a weather-resistant, vulcanizable synthetic rubber mixture. The outer coating 2 is both adhered to the outer surface of the base material 1 and penetrates and impregnates into the base material 1 at the region 3, i.e. for only a predetermined limited region in the vicinity of the outer surface 2 of the base material 1. Thus, the 131~
weather-resistant board comprises an integral uniting of the base material 1 and the synthetic rubber coating 2 which is bound to and is penetrated into and impregnated into the surface of the base material and is bound thereto for only a predetermined limited region in the vicinity of the outer surface of the base after the synthetic rubber coating 2 has been vulcanized.
Figure 2 shows, in cross-section, the weather-resistant board of one embodiment of this invention in the form of a base material 1 and a vulcanized outer synthetic rubber layer 2. The board is shown as being bent completely around (at the right hand side) so that the outer synthetic rubber layer 2 extends around the side edges and portion of the bottom. The elasticity of the outer synthetic rubber layer 2 enables the corners 4 to act as hinges.
On the left hand side, the board is shown as being bent to form a step, with the elasticity of the synthetic rubber outer coating 2 enabling the outer and inner corners 4 to act as hinges. If necessary, a wooden slat 5 can be secured to the inner face behind the step.
In Figure 3, a pre-molded vessel having the cross-section of a bottom 15, side walls 16 and a rim 17 is provided, which is formed of the single-faced board consisting of the base material 1 and the outer coating 2 (shown on the left hand side), or alternatively of the double-faced board consisting of the base material 1 and the outer synthetic rubber coatings 2 (shown on the right hand si~e). ~fter or durlng the moulding operation, the rubber surface 2 is ~-ulcanized as previously described.
The board ln Figure 4 is shown in the forrn of a pre-moulded prefabricated building element for use in a wall having a profile consisting of main wall portion 18, edge portion 19 and a window opening 20.
Figure 5 provides a depiction of one method for the manufacture of weather-resistant boards and mouldings according to an embodiment of this invention. A parting agent ~e.g. talc in powdered form) is first applied, as by spraying, onto the charging platform 10. Then a granulated mixture of the unvul-canized synthetic rubber 7 is applied, and finally a mixture of fibres and/or particle materials 8 is applied thereon, to provide a batt 9, having an unvulcanized synthetic rubber film 7a on one face thereof. The batt 9 is subjected to compression and heat (to at least 175 C.) on the hot press 12. This provides a simultaneous compression of the batt and a vulcanization of the weather-resistant vulcanizable outer synthetic rubber coating 2.
The outer synthetic rubber coating 2 penetrates and is impreg-nated into the base material 1 as previously described and this results in the integrated, united board as described in Figure 1.
Figure 6 shows another aspect of an alternative manufac-turing method of this invention. Here the parting agent 6 is first sprayed onto the charging platform 10. Then the fibres and/or particle material mixture 8 is applied to form a batt 9.
- l~b -Finally the outer synthetlc rubber coating is applied in the form of an unvulcanized film of rlbber 11. The further processing is the same as described for Figure 5.
Claims (19)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for preparing a weather-resistant board comprising one of the following procedures:
(A) (a) laying down an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic mineral fibrous or particle material, as a pre-formed batt on a movable charging platform, said batt including a binder material associated therewith, (b) laying down thereon a vulcanizable weather-resistant elastomer material, thereby to provide a composite having an outer material;
and (c) compressing said composite under conditions of high pressure and a temperature of at least 175°C;
whereby said outer material is converted to vulcanized form and is bound to and is both adhered to one surface of said base material and is penetrated into and impregnated into the said surface of said base material and is bound thereto for only a predetermined limited region in the vicinity of said outer surface of said base material and being vulcanized therein in situ;
or (B) (a) laying down a vulcanizable weather-resistant elastomeric material on a movable charging platform, (b) laying down thereon an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic mineral fibrous or particle material, as a pre-formed batt, said batt including a binder material associated therewith, thereby to provide a composite having an outer material;
and (c) compressing said composite under conditions of high pressure and a temperature of at least 175°C;
whereby said outer material is converted to vulcanized form and is bound to and is both adhered to one surface of said base material and is penetrated into and impregnated into the said surface of said base material and is bound thereto for only a predetermined limited region in the vicinity of said outer surface of said base material and being vulcanized therein in situ.
(A) (a) laying down an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic mineral fibrous or particle material, as a pre-formed batt on a movable charging platform, said batt including a binder material associated therewith, (b) laying down thereon a vulcanizable weather-resistant elastomer material, thereby to provide a composite having an outer material;
and (c) compressing said composite under conditions of high pressure and a temperature of at least 175°C;
whereby said outer material is converted to vulcanized form and is bound to and is both adhered to one surface of said base material and is penetrated into and impregnated into the said surface of said base material and is bound thereto for only a predetermined limited region in the vicinity of said outer surface of said base material and being vulcanized therein in situ;
or (B) (a) laying down a vulcanizable weather-resistant elastomeric material on a movable charging platform, (b) laying down thereon an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic mineral fibrous or particle material, as a pre-formed batt, said batt including a binder material associated therewith, thereby to provide a composite having an outer material;
and (c) compressing said composite under conditions of high pressure and a temperature of at least 175°C;
whereby said outer material is converted to vulcanized form and is bound to and is both adhered to one surface of said base material and is penetrated into and impregnated into the said surface of said base material and is bound thereto for only a predetermined limited region in the vicinity of said outer surface of said base material and being vulcanized therein in situ.
2. The method of claim 1 wherein said base material is laid down as a pre-formed batt of fibres, chips or particles of wood or other plants.
3. The method of claim 1 wherein said weather-resistant elastomer is a vulcanizable rubber which is a synthetic rubber.
4. The method of claims 1, 2 or 3 wherein said base material is laid down as a pre-formed batt directly on said movable charging platform.
5. The method of claims 1, 2 or 3 wherein said base material is laid down as a pre-formed batt on a layer of said weather-resistant elastomer which is a vulcanizable rubber which had previously been laid down on said movable charging platform.
6. The method of claims 1, 2 or 3 including the preliminary step of laying down a first layer of a parting material on said movable charging platform.
7. The method of claims 1, 2 or 3 including the additional step of further pressing said laid-down pre-formed batt of said base material.
8. A weather-resistant impregnated board possessed of surface elasticity and pliancy by means of a permanently-elastic covering layer, comprising:
(a) an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic fibrous or particle material, and (b) a vulcanized outer covering layer constituted by a vulcanized, weather-resistant, resilient, synthetic elastomeric material which has been vulcanized therein in-situ at a temperature of at least 175°C; said vulcanized outer covering layer being bound to and both adhered securely to one outer surface of said base material, and, when in unvulcanized form, being penetrated into and impregnated below and into the same outer surface of said base material to be within the porous structure of said base material for only a predetermined limited region in the vicinity of said outer surface of said base material, and being vulcanized therein in situ at said temperature of at least 175°C to be bound thereto for only said predetermined limited region.
(a) an impregnatable porous base material selected from the group consisting of (i) a lignocellulose or other organic fibrous or particle material, and (ii) an inorganic fibrous or particle material, and (b) a vulcanized outer covering layer constituted by a vulcanized, weather-resistant, resilient, synthetic elastomeric material which has been vulcanized therein in-situ at a temperature of at least 175°C; said vulcanized outer covering layer being bound to and both adhered securely to one outer surface of said base material, and, when in unvulcanized form, being penetrated into and impregnated below and into the same outer surface of said base material to be within the porous structure of said base material for only a predetermined limited region in the vicinity of said outer surface of said base material, and being vulcanized therein in situ at said temperature of at least 175°C to be bound thereto for only said predetermined limited region.
9. The weather-resistant impregnated board of claim 8 wherein said base material is a batt of a lignocellulose or other organic fibrous or particle material.
10. The weather-resistant impregnated board of claim 9 wherein said batt is a batt of fibres, chips or particles of wood or other plants.
11. The weather-resistant impregnated board of claim 9 wherein said base material is a batt of an inorganic mineral fibrous or particle material.
12. The weather-resistant impregnated board of claim 11 wherein said batt is a batt of mineral wool, glass wool, glass fibres or synthetic fibres.
13. The weather-resistant board of claim 8 wherein said vulcanized outer covering layer is adhered to two mutually opposed faces thereof.
14. The weather-resistant board of claim 8 wherein said vulcanized outer covering layer completely encases said board.
15. The weather-resistant board of claim 8 wherein said resilient, synthetic elastomeric material is a synthetic vulcanizable rubber.
16. The weather-resistant board of claim 8, wherein said vulcanized outer covering layer is provided with a further surface covering selected from the group consisting of aluminum powder, aluminum foil, and colour pigments.
17. The weather-resistant board of claim 8, wherein said vulcanized outer covering layer is provided with a further surface coating in the form of a relief ornamental structure.
18. The weather-resistant board of claim 8 in flat form.
19. The weather-resistant board of claim 8 in shaped, moulded form.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/434,234 US4562103A (en) | 1979-10-23 | 1982-10-14 | Weather resistant boards |
| CA000492093A CA1319883C (en) | 1979-10-23 | 1985-10-02 | Weather-resistant lignocellulose or other organic or inorganic material boards and process for their production |
| US06/785,198 US4690848A (en) | 1979-10-23 | 1985-10-07 | Weather-resistant lignocellulose or other organic or inorganic material boards and process for their production |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7466979A | 1979-10-23 | 1979-10-23 | |
| US06/434,234 US4562103A (en) | 1979-10-23 | 1982-10-14 | Weather resistant boards |
| DE19843411451 DE3411451A1 (en) | 1984-03-28 | 1984-03-28 | Processes for elastomer-coating mineral materials by heat vulcanisation and products produced according to the processes |
| CA000492093A CA1319883C (en) | 1979-10-23 | 1985-10-02 | Weather-resistant lignocellulose or other organic or inorganic material boards and process for their production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1319883C true CA1319883C (en) | 1993-07-06 |
Family
ID=27426423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000492093A Expired - Fee Related CA1319883C (en) | 1979-10-23 | 1985-10-02 | Weather-resistant lignocellulose or other organic or inorganic material boards and process for their production |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1319883C (en) |
-
1985
- 1985-10-02 CA CA000492093A patent/CA1319883C/en not_active Expired - Fee Related
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