Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1997-09-15
2001-09-11
Reddick, Judy M. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S035000, C524S043000, C524S405000, C524S414000, C524S417000, C524S251000, C524S080000, C524S492000, C524S493000, C524S437000
Reexamination Certificate
active
06288147
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an aqueous dispersion adhesive which includes a copolymer and/or terpolymer dispersion and a flame-proofing agent based on compounds of boron or aluminum.
2. Description of Related Art
A product having as an adhesion-promoting surface layer with such an adhesive is known from EP-B 0 109 663, which describes a flame-resistant wallpaper lining of rigid polystyrene foam, which has on at least one of its surfaces a coating to improve the adhesion between the wallpaper lining and combustible wallpaper. This coating includes a flame-retardant additive and the adhesive of comprised a copolymer or terpolymer having predominantly vinyl acetate units.
The flame-retardant additive includes a non-combustible inorganic compound based on aluminum and boron. The weight ratio of adhesive to flame-retardant additive is 1:3 to 1:8. The coating has a weight per unit area of 100 to 400 g/m
2
, in particular of 200 to 300 g/m
2
in the dry state. The flame-retardant additive is a mixture of aluminum hydroxide and zinc borate in a weight ratio of 1:1 to 7:1, in particular 2:1 to 5:1. The adhesive can also be a terpolymer having predominantly vinyl acetate units as well as ethylene units and vinyl chloride units.
Wall lining sheets or films of rigid polystyrene foam are generally known and are used as so-called wallpaper linings for lining walls before wallpaper is glued on. They are described, for example, in EP-A-0 036 156 and DE-U 79 31 745. In addition to sheets in folded or unfolded form, rolls of film are also employed. With such sheets or films, for example, masonry cracks can be covered, a certain thermal insulation can be achieved and formation of condensation can be prevented.
It is also known from EP-A-0 036 156 to use an adhesive which includes a gluing component which is known per se and additionally 20 to 80% by weight, based on its gluing content, of a flame-retardant agent for gluing wallpaper to foamed polystyrene coverings. Suitable flame-retardant agents are compounds based on ammonium phosphate and ammonium sulfamate.
The teaching of DE-U 79 31 745 is to provide not the adhesive but the adhesion-promoting surface layer applied to the wallpaper lining of rigid polystyrene foam with a flameproofing agent. The pasted wallpaper, with an adhesive already applied to the wallpaper, is then bonded to the wallpaper lining via this adhesion-promoting layer. According to this publication, the wallpaper sheets are coated with an aqueous dispersion of the filled dispersion adhesive type during production and are then dried in a heating zone. The adhesion-promoting layer has the task of increasing the adhesiveness between the wallpaper lining and the pasted wallpaper. The adhesion-promoting surface layer of the wallpaper lining can likewise comprise a flame-retardant additive, but there is no disclosure on the nature and amount of this flameproofing agent or on the application process.
It is also known from DE-A 22 44 775 to employ adhesive compositions based on a vinyl acetate/ethylene copolymer emulsion for reinforcing carpets which comprise a filling material suitable for reducing flammability, such as aluminum oxide trihydrate.
A disadvantage of the coating adhesive known from EP-B 0 109 663 is that it can be employed only as an adhesion-promoting surface layer for rigid polystyrene foam for internal applications, and that it can no longer be processed after storage for a few weeks.
SUMMARY OF THE INVENTION
One object of the present invention is to develop a dispersion adhesive which remains processable for months and which consistently has good adhesion properties for a large number of various materials with respect to the particular substrate with which these materials are glued. Another object is to provide an adhesive having a low flammability. Yet another object is to provide a composite of a substrate and material glued on the substrate having a low flammability. Still another object of the present invention is to provide a substrate that has the aqueous dispersion adhesive applied to at least one surface of the substrate.
In accomplishing the foregoing objects, there has been provided according to one aspect of the present invention an aqueous dispersion adhesive, which includes: (i) an adhesive polymer dispersion selected from the group consisting of a copolymer, a terpolymer and a mixture thereof; (ii) up to about 75% by weight of a flameproofing agent selected from the group consisting of a boron compound, an aluminum compound, a boron and aluminum compound and a mixture thereof; (iii) up to about 0.8% by weight of a processing and thickening agent; and (iv) up to about 0.8% by weight of a wetting agent, in each case based on the total weight of the aqueous dispersion adhesive.
Another aspect of the present invention provides a substrate that has at least one surface coated with the aqueous dispersion adhesive. Further objects, features and advantages of the present invention will become apparent from the detailed description of the preferred embodiments which follows.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention comprises a dispersion adhesive of the type described above, preferably having as additives up to about 0.8% by weight of a processing and thickening agent, up to about 75% by weight of flameproofing agent and up to about 0.8% by weight of a wetting agent, in each case based on the total weight of the dispersion adhesive.
The dispersion adhesive can be used, inter alia, as a rigid foam adhesive for foamed polystyrene films, sheets and shaped articles. The polystyrene is in the form of, for example, web-like films or rectangular sheets. Such sheets comprise extruded rigid polystyrene foam or particle foam, and the processes for the production of such sheets or films and of the materials themselves are known from the literature references cited in EP-A 0 036 156, which is hereby incorporated by reference in its entirety.
Compared with the adhesion promoter known from EP-B 0 109 663, the dispersion adhesive according to the present invention preferably has a higher wetting agent content, preferably includes a suspending agent and preferably has a considerably increased content of processing and thickening agent.
By the positive interaction of these three components, the initial adhesive force and the processability of the dispersion adhesive is increased considerably and is guaranteed over relatively long periods of time of at least 12 months.
In a further development of the invention, the polymer dispersion can include a co- or terpolymer having vinyl acrylate units, and the additive amount of processing and thickening agent can preferably be up to about 0.8% by weight, and the additive amount of a wetting and dispersing agent can be up to about 0.3% by weight. The dispersion is preferably a copolymer of an acrylic acid ester and styrene. However, any suitable copolymer can be used.
In one embodiment of the invention, 100% by weight of aqueous dispersion of the adhesive can include about 15 to 50% by weight, in particular about 20 to 30% by weight, of the co- or terpolymeric dispersion, about 40 to 75% by weight of flame-proofing agent and about 5 to 20% by weight of additions of thickener, wetting agent, suspending agent, preservative, foam suppressant, drying retardant, agent for reducing the film formation temperature and water. However, any suitable range can be used.
The weight ratio of aqueous co- or terpolymeric dispersions to flameproof ing agents preferably ranges from about 1:5 to less than 1:0.8, in particular from about 1:2.9 to 1:2. The coating of adhesive preferably has a weight per unit area of about 300 to 800 g/m
2
(moist, i.e., wet basis). However, any suitable weight ratio and coating weight per unit area can be used.
In another embodiment of the invention, 100% by weight of aqueous dispersion of the adhesive can include about 10 to 50% by weight, in particular about 20% by weight, of the copolymer dispersion, about 30 to 62% by weight of flameproo
Bogers Jack J.
Vonken Hub A. G.
Depron B.V.
Foley & Lardner
Reddick Judy M.
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