JP2004027123A - Sheet-like foam for adhesion and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet-like foam for adhesion in which a pressure-sensitive adhesive layer is formed by coating a foam as a base material with a re-activating hot-melt type adhesive and thus no releasing paper is required and production efficiency, handling properties and the like can remarkably be improved, and a method for producing this. <P>SOLUTION: In producing the sheet-like foam for adhesion comprising the sheet-like foam 12 and the pressure-sensitive adhesive layer 14 formed on at least one surface of the foam 12, and being stuck on a required object to be stuck through this adhesive layer 14, the adhesive layer 14 is formed of the re-activating hot-melt type adhesive. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet-like foam to be adhered and a method for producing the same, and more particularly, it is suitably used as an interior material for automobiles and buildings for use as a soundproofing material or a cushioning material, and is applied to the automobile or building. By forming the adhesive layer that exerts an adhesive action from a reactivated hot-melt adhesive that develops adhesiveness at a predetermined temperature, it does not exhibit adhesiveness at room temperature and does not require release paper. The present invention relates to a foam and a method for producing the sheet-like foam to be attached.
[0002]
[Prior art]
Generally, a foam made of a polyurethane resin having high versatility (hereinafter, simply referred to as a foam) is suitably used as a material of a soundproofing / sound absorbing material or an impact cushioning material used for an interior material of an automobile. I have. The foam has an advantage that it is easy to set an expansion ratio for setting physical properties such as handleability and density and cell diameter at the time of foaming, and as described above, the installation space is limited, It is very suitable as a material for a member that requires a predetermined performance (the soundproofing / sound absorption and the shock absorbing ability are greatly affected by the density and the bubble diameter).
[0003]
In general, as shown in FIG. 5, a sheet-shaped sticking foam 50, which is preferably used as an interior material of an automobile, includes a foam 52, which is a base material exhibiting soundproofing / sound absorbing and shock absorbing functions, and An adhesive layer 54 is formed on at least one surface of the foam 52 with a required thickness and adheres to a required adhered portion such as an inner surface of an automobile door. The adhesive layer 54 has adhesiveness not only on the foam 52 side but also on the opposite side. For this reason, the adhesive layer 54 is not inadvertently adhered to an unintended substance or place until, for example, during transfer, until the adhesive foam 50 is attached to a required adhered portion. A release paper 56 was provided on the opposite side of the foam 52 at 54.
[0004]
The sticking foam body 50 is manufactured by a manufacturing apparatus 60 as shown in FIG. The manufacturing apparatus 60 includes an adhesive layer forming section 62 that forms the adhesive layer 54 on the release paper 56, and a foam laminate section 70 that laminates the release paper 56 on the foam 52 via the adhesive layer 54. Consists of two large blocks.
[0005]
The adhesive layer forming unit 62 includes a release paper supply unit 64 that continuously supplies the release paper 56 while applying a predetermined tension thereto, and an adhesive that applies a required amount of adhesive on the release paper 56. The coating section 66 and the adhesive applied on the release paper 56 are heated to a predetermined temperature, and the water (or required water) generated when the main agent and the curing agent constituting the adhesive are mixed with each other. And a heating section 68 composed of a plurality of tunnel-shaped electric furnaces or the like to form a pressure-sensitive adhesive layer 54 having improved adhesiveness to the foam 52 by increasing viscosity by heat. By passing through the adhesive layer application section 62, the release paper 56 and the adhesive layer 54 having a predetermined thickness are laminated to form an intermediate laminate 58.
[0006]
In addition, the foam laminate unit 70 includes a foam supply unit 72 that continuously supplies the foam 52 serving as a base material while applying a predetermined tension to the foam 52, and the adhesive 52 that adheres to the foam 52 that is supplied. With the intermediate laminate 58 obtained in the layer application section 62 being tensioned, the pressure-sensitive adhesive layer 54 side is pressed and laminated on the foam 52 to form a final laminate 74 which is a sticking foam 50 as a final product. And a collecting section 76 for sequentially collecting and collecting the obtained adhesive foam 50.
[0007]
[Problems to be solved by the invention]
However, in the case of the adhesive foam 50 in which the foam 52, the adhesive layer 54, and the release paper 56 are laminated in three layers as described above, the following disadvantages are pointed out. That is, the release paper 56 is a member that is peeled off when the sticking foam 50 is used, but the peeling work that is required each time is troublesome. Further, if the above-mentioned peeling operation fails, there is a fear that the product itself may become unusable.
[0008]
Furthermore, since the release paper 56 after peeling is a member composed of a paper material (burnable dust) and a low-adhesion layer (non-burnable dust) such as a plastic film that prevents adhesion, it is difficult to recycle. Yes, and basically must be discarded after use. Further, the adhesive foam 50 is a member that is used in a large amount for general purposes. Therefore, the amount of the release paper 56 to be discarded is extremely large according to the amount of the adhesive foam 50 used. Has become. Therefore, in the processing of the release paper 56, the processing cost is increased and the burden on the environment is increased. In addition, it is pointed out that as the amount of use increases, the raw material cost of the release paper 56 to be treated as waste and the occupancy of the place and the like cannot be ignored.
[0009]
Further, as is apparent from FIG. 6, the manufacturing apparatus 60 can perform sufficient heating and precise temperature control in order to appropriately laminate the foam 52 and the release paper 56 during manufacturing. A heating section 68 is provided. The heating unit 68 is provided with a plurality of heating furnaces that can be controlled in a stepwise manner in order to achieve evaporation removal of water and improvement in viscosity and not to deteriorate physical properties such as adhesiveness of the adhesive layer 54. , Must have a sufficient length. Such a heating unit 68 has a large initial cost and an operating cost, is complicated in its control, and has a large occupancy rate in a factory. As a result, the manufacturing cost of the adhesive foam 50 is increased, In addition, there is a problem that the yield is deteriorated.
[0010]
[Object of the invention]
SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the problem in view of the disadvantages of the pasting sheet-like foam and the method for producing the same according to the related art, and has been proposed to solve the problem. In contrast, a hot-melt adhesive was applied to form a pressure-sensitive adhesive layer, so no release paper was required and the production efficiency and handleability of the adhesive sheet-like foam were greatly improved. It is an object to provide a body and a method for producing it.
[0011]
[Means for Solving the Problems]
In order to overcome the above problems and achieve the intended purpose, the sticking sheet-like foam according to the present invention comprises a sheet-like foam and an adhesive layer formed on at least one surface of the foam. In the adhesive sheet-like foam to be adhered to the required adhered portion via the adhesive layer,
The pressure-sensitive adhesive layer is formed by applying a reactive hot-melt adhesive. As the foam used in the present invention, a foam made of a polyolefin-based resin such as polyethylene, polypropylene, polystyrene, or polystyrene, a phenol-based resin, a urethane-based resin, or a melamine-based resin is used. In particular, a flexible polyurethane slab foam which is rich in mass productivity at normal temperature and normal pressure and can be easily formed into a thin layered long or rolled material is preferable.
[0012]
In order to overcome the above problems and achieve the intended purpose, a method for producing a sheet-like foam to be adhered according to another invention of the present application is to continuously produce a long sheet-like foam produced in advance in another step. Supply,
In the process of continuously supplying the long object, by applying a molten reactivated hot melt type adhesive to at least one surface of the long object,
The present invention is characterized in that a long sticking sheet-like foam having a pressure-sensitive adhesive layer formed of the reactivated hot-melt adhesive is formed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a sheet-like foam to be attached and a method for producing the same according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. As shown in FIG. 1, the adhesive sheet-like foam 10 according to a preferred embodiment of the present invention includes a sheet-like foam 12 having a required thickness, which is a base material exhibiting soundproofing / absorbing and shock absorbing functions. An adhesive layer 14 is formed on at least one surface of the foam 12 with a required thickness and develops adhesiveness when heated at a predetermined temperature.
[0014]
The sheet-like foam 12 is a base material of the sticking sheet-like foam 10 according to the present invention, and exhibits a good soundproofing function and a shock-absorbing function due to the lightness and high air permeability of the foam. Of the main member. In general, the thickness is set to a thickness that can take advantage of the lightness and the like of the foam and that can exhibit a sufficient soundproofing / impact buffering function, specifically, about 10 to 70 mm. As the material constituting the sheet-like foam 12, a polyolefin-based resin such as polyethylene, polypropylene, polystyrene or polystyrene, a phenol-based resin, a urethane-based resin, a melamine-based resin, or the like is appropriately selected according to its intended use. However, a flexible polyurethane slab foam which is excellent in mass productivity at normal temperature and normal pressure and moldability into a thin layered material is preferable. Therefore, in this embodiment, an example in which a polyurethane resin is used as the material of the sheet-like foam 12 will be described. The sheet-like foam 12 using the polyurethane-based resin is basically obtained by mixing polyol and isocyanate as main raw materials with additives such as a catalyst as a foaming agent and a polymerization initiator.
[0015]
Basically, the polyurethane-based resin forming the sheet-like foam 12 is a reaction product obtained by polymerizing a required polyol and isocyanate, and by changing the kind of the polyol and isocyanate, various physical properties are obtained. Has the characteristic of expressing The polyurethane refers to a polymer having a urethane bond, and the urethane bond is formed by an addition reaction between an isocyanate having an isocyanate group and a polyol having an active hydrogen such as a hydroxyl group.
[0016]
The compound having two or more hydroxyl groups is generally called a polyol, and in the present invention, a commonly used condensation-polymerized polyester polyol, a polyester polyol obtained by ring-opening polymerization of a cyclic ester such as ε-caprolactone, a cyclic ether Polyether polyols obtained by ring-opening polymerization of, or polyether ester polyols obtained by copolymerization of these can be used.
[0017]
On the other hand, examples of the isocyanate include various commonly used aromatic, aliphatic, and alicyclic isocyanate compounds having two or more isocyanate groups, and further, a modified isocyanate obtained by modifying an isocyanate compound. It can be used, and two or more of the isocyanates may be used in combination.
[0018]
Specifically, diphenylmethane diisocyanate (MDI), crude diphenylmethane diisocyanate, tolylene diisocyanate (TDI), naphthalene diisocyanate (NDI), P-phenylene diisocyanate (PPDI), xylene diisocyanate (XDI), tetramethylene diisocyanate (TMXDI), tolidine Aromatic isocyanates such as diisocyanate (TODI), isophorone diisocyanate (IPDI), cyclohexyl diisocyanate (CHDI), hydrogenated XDI (H ₆ XDI), hydrogenated MDI (H ₁₂ Alicyclic isocyanates such as MDI), aliphatic isocyanates such as hexamethylene diisocyanate (HDI), lysine diisocyanate (LDI), and lysine triisocyanate (LTI). Examples of the modified products include urethane-modified isomer compounds, dimers, trimers, carbodiimide-modified products, allophanate-modified products, burette-modified products, urea-modified products, and prepolymers. Among them, TDI is particularly preferable because it is inexpensive.
[0019]
As the additive, a catalyst as a polymerization initiator used in the production of ordinary polyurethane-based resin, a cross-linking agent and a foaming agent, further a chain extender, a flame retardant or an ultraviolet absorber, an antioxidant, if necessary, Examples include an antioxidant, a filler, a plasticizer, a coloring agent, a fungicide, an antibacterial agent, and the like, and these auxiliary materials are added as needed. For example, as a chain extender, a polyvalent amine such as diethyltoluenediamine and dimethylthiotoluenediamine, and the like, and as the flame retardant, tris-dichloropropyl phosphate, tris-chloroethyl phosphate, dibromoneopentyl alcohol, tribromoneopentyl Alcohol or the like is used as the ultraviolet absorber as 2- (2-hydroxy-5-tert-butylphenyl) benzotriazole, 2 ′-(2′hydroxy-3 ′, 5′-di-tert-butylphenyl) 5-chlorobenzo. Triazole, bis (2,2,6,6-tetramethyl-4-piperidine) separate, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine and the like can be mentioned respectively.
[0020]
As the catalyst, a conventionally known substance can be used.For example, dimethylcyclohexylamine, N-methyldicyclohexylamine, triethylamine, tripropylamine, tributylamine, N-methylmorpholine, N-ethylmorpholine, Non-reactive monoamines such as N-dimethylbenzylamine, triethylenediamine, tetramethylhexamethylenediamine, bisdimethylaminoethylether, tetramethylpropanediamine, dimethylaminoethylmorpholine, tetramethylethylenediamine, diazobicycloundecene, 2-methyl Non-reactive diamines such as -1,4-diazo (2,2,2) bicyclooctane, non-reactive triamines such as pentamethyldiethylenetriamine and pentamethyldipropylenetriamine; Reactive amines such as methylethanolamine, N-trioxyethylene-N, N-dimethylamine, N, N-dimethyl-N-hexanolamine or organic salts thereof, 1-methylimidazole, 2-methylimidazole, Compounds such as 2,2-dimethylimidazole, 2,4-dimethylimidazole, 1-butyl-2-methylimidazole, stannas octoate, stannas oleate, dibutyltin dilaurate, dibutyltin dimaleate, lead octylate, etc. Organometallic compounds, 2,4,6-tris (dimethylaminomethyl) phenol, 2,4,6-tris (dimethylaminoalkyl) hexahydro-S-triazine, potassium acetate, potassium octylate, potassium 2-ethylhexanoate, etc. And a trimerization catalyst.
[0021]
As the crosslinking agent, conventionally known polyhydric alcohols such as ethylene glycol, propylene glycol, butanediol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, hexamethylenediamine, hydrazine, diethyltoluenediamine, amines such as diethylenetriamine And amino alcohols such as monoethanolamine, diethanolamine and triethanolamine.
[0022]
Examples of the foaming agent include water, halogenated hydrocarbons such as HCFC-141b, HFC-134a, HFC-245fa and HFC-365mfc, hydrocarbons such as cyclopentane, isopentane and normal pentane, nonafluorobutyl methyl ether, nona Hydrofluorocarbons such as fluoroisobutyl methyl ether, nonafluorobutyl ethyl ether, nonafluoroisobutyl ethyl ether, pentafluoroethyl methyl ether, and heptafluoroisopropyl methyl ether, and liquefied carbon dioxide are used. Among these foaming agents, water is most preferred in terms of versatility and the like.
[0023]
As the foam stabilizer, substances commonly used in the production of ordinary foams can be used. For example, various foam stabilizers such as dimethylsiloxane, polyetherdimethylsiloxane, and phenylmethylsiloxane can be used.
[0024]
Like the conventional adhesive layer 54, the adhesive layer 14 is a portion that exerts an action of attaching the adhesive sheet-like foam 10 to a required adhered portion such as an interior part of an automobile. In the present invention, the pressure-sensitive adhesive layer 14 is applied to at least one surface of the sheet-like foam 12 serving as a base material by heating at a predetermined temperature, thereby applying a reactive hot-melt adhesive M that exhibits tackiness. It is formed by doing.
[0025]
The reactivated hot-melt adhesive M melts at a certain temperature or higher, and after being solidified by cooling, is heated at a predetermined temperature equal to or lower than the melting temperature, so that the adhesive does not melt every time it is heated, so that the adhesive does not melt. An adhesive that develops (reactivates). Therefore, it has a property that it is in a solid state at room temperature, is melted by heat at a use temperature of 150 to 200 ° C., and is solidified by cooling.
[0026]
In order to contribute to the understanding of the present invention, a reactivated hot melt adhesive will be described. The reactivated hot melt adhesive is composed of a base polymer, a tackifying resin, a wax, a stabilizer, and a filler that is added as necessary. The base polymer determines general properties such as cohesiveness, thermal behavior and stability of the adhesive, and olefin, polyamide or ester-based resins and various rubbers are suitably used. Specific examples include an ethylene / n-butyl acrylate copolymer or an ethylene / unsaturated carboxylic acid ester copolymer. In particular, when a polyolefin and a copolymer thereof are used as the base polymer, it is preferable in view of physical properties such as a thermal decomposition temperature of the sheet-like foam 12 to be applied, properties of the foam, and various factors such as familiarity with the foam 12. .
[0027]
The tackifying resin serves to impart excellent high-temperature adhesive strength to the obtained reactivated hot-melt adhesive and to improve the adhesiveness at a predetermined use temperature. The wax appropriately adjusts the viscosity of the obtained reactivated hot melt adhesive, thereby controlling the rheological properties of the base polymer at the operating temperature. Further, examples of the stabilizer include an antioxidant or an anti-ultraviolet agent that exhibits resistance to oxidation or ultraviolet light, and are used for the purpose of enhancing the anti-deterioration property of the obtained reactivated hot melt adhesive. I have. In addition, a plasticizer may be used to improve low-temperature characteristics such as flexibility at low temperatures.
[0028]
The dissolution temperature of the reactivated hot-melt adhesive M in the present invention is set to a temperature at which the physical properties of the sheet-like foam 12 to be applied do not deteriorate, that is, about 150 to 170 ° C. If this temperature exceeds 170 ° C., it is conceivable that the application to the sheet-like foam 12 will have a bad influence on the foam 12. If the temperature is lower than 150 ° C., the reactivation temperature described later is lowered, and as a result, the usable temperature range in actual use is narrowed. It is to be noted that a suitable temperature may be appropriately determined depending on the material of the sheet-like foam 12, but it is desirable to set the temperature to about 100 to 180 ° C. from the convenience in use.
[0029]
The viscosity of the reactivated hot-melt adhesive M within the above-mentioned melting temperature, that is, the viscosity at the time of application, is also set in the range of 12 to 18 Pa · S (12000 to 18000 cps). If the viscosity is less than 12 Pa · S, the viscosity is too low, so that when applied to the sheet-like foam 12, the re-applied paint is applied to the cells (cells) forming the foam 12. The active hot-melt adhesive M flows. If it exceeds 18 Pa · S, it becomes difficult to control the amount of the reactivated hot melt adhesive M applied to the sheet-like foam 12. In addition, regarding this viscosity, the skeleton structure of the sheet-like foam 12 used (for example, when the material of the foam 12 is a melamine resin or the like, a foam having a thin skeleton and a large cell opening) is used. Therefore, care must be taken, and it is desirable to set the viscosity appropriately.
[0030]
Furthermore, the reactivation temperature of the reactivated hot melt type adhesive M in the present invention (the development of tackiness) does not deteriorate the physical properties of the sheet-like foam 12 to be applied, and is lower than the above-mentioned melting temperature. The temperature is set to a temperature that can be easily heated, that is, about 100 to 150 ° C. When this temperature exceeds 150 ° C., the above-mentioned solubility temperature also increases by that amount, and as a result, when applied to the sheet-like foam 12, a bad influence is exerted on the foam 12. It is possible. In the case where the temperature is lower than 100 ° C., the site to be used is, for example, in the case of an automobile or the like, and the temperature exceeds the temperature in summer or the like, and the hot melt-type adhesive for forming the adhesive layer 14 is used. Since the agent M is reactivated, a suitable use cannot be achieved. In addition, as for this temperature, a suitable temperature may be appropriately determined depending on the material of the sheet-like foam 12 similarly to the melting temperature, but from the convenience of use, it is set to about 100 to 180 ° C. Is desired.
[0031]
【Production method】
A preferred method and apparatus for manufacturing the sticky sheet-like foam 10 according to the present embodiment will be described below with reference to FIGS. As shown in FIG. 2, the manufacturing method of the sticking sheet-like foam 10 basically includes a foam (elongate) manufacturing process S1 performed in another process and an adhesion performed by a manufacturing apparatus 30 described later. It comprises an agent application step S2, an adhesive layer forming step S3, and a final step S4. The foam (elongated) manufacturing step S1 is a step of manufacturing the elongated object 20 made of the sheet-shaped foam 12 using each raw material such as the polyol and the isocyanate forming the polyurethane-based resin described above. Specifically, this is a step of mixing the respective raw materials with a predetermined mixer, supplying the raw materials to a low-pressure injector, and discharging and foaming the raw materials under atmospheric pressure so as to obtain a desired long product 20. In addition, the long object 20 is manufactured by using a conventionally known chemical foaming method or mechanical stirring (mechanical floss) method, or by using a conveyer or the like to perform limited foaming under the limitation of the vertical dimension. Is also good.
[0032]
As shown in FIG. 3, the manufacturing apparatus 30 that suitably performs the adhesive application step S2, the adhesive layer forming step S3, and the final step S4 performs a process on the long object 20 of the sheet-like foam 12 serving as a base material. An adhesive for continuously applying a predetermined amount of the reactivated hot-melt adhesive M to the foam supply section 32 which continuously supplies a predetermined tension and a supplied long object 20 An application section 34, an adhesive layer forming section 36 for forming the adhesive layer 14 by naturally cooling the applied adhesive M, and a collecting section 38 for collecting the obtained adhesive foam 10 by sequentially winding the same. Consists of
[0033]
The adhesive application step S2 is performed by the adhesive application section. Specifically, the reactivated hot-melt adhesive M, which has been melted by heating to have a desired viscosity, is applied to at least one surface of the continuous material 20 which is continuously supplied by a coating machine 34a. This is a step of sequentially applying. The coating machine 34a is in communication with a storage section of a reactivated hot melt adhesive M (not shown), and the adhesive M is supplied as needed.
[0034]
The amount of the reactivated hot melt adhesive M applied is 5 to 100 g / m2 based on the long product 20. ² Is applied in the range of This basis weight is 5g / m ² If it is less than 3, the formed adhesive layer 14 cannot exhibit sufficient adhesive strength, or its thickness becomes less than 0.1 mm described later, and is suitable for, for example, an adhered portion having a complicated shape. There is a fear that it will be impossible to stick it. In addition, 100 g / m ² Beyond, care must be taken because the pressure-sensitive adhesive layer 14 formed becomes thick and the lightness of the sheet-like foam 12 as the base material is offset.
[0035]
The application of the reactivated hot-melt adhesive M can be performed by any method that enables uniform application on the long object 20. Actually, in order to continuously apply the reactivated hot-melt adhesive M in a molten state having a predetermined viscosity while keeping the applied amount constant, porous coating or roll coating is preferable.
[0036]
In the adhesive layer forming step S3, the reactivated hot melt adhesive M applied in the adhesive applying step S2 is passed through a line of a predetermined length provided on the downstream side of the adhesive applying section 34, so that the adhesive is formed naturally. This is a step in which the adhesive layer 14 is cooled to a temperature equal to or lower than the above-mentioned melting point and has a predetermined thickness. Specifically, this is performed by the adhesive layer forming section 36. The adhesive layer forming section 36 includes the reactivated hot melt type adhesive applied between the adhesive applying section 34 and the collecting section 38. It is only necessary to provide a distance that allows the agent M to be left for a time that can be cooled to the melting temperature or lower.
[0037]
The thickness of the pressure-sensitive adhesive layer 14 formed in the pressure-sensitive adhesive layer forming section 36 is determined by the viscosity of the molten reactivated hot-melt adhesive M at the time of application and the basis weight in the adhesive application step S2. It is set in the range of 1 to 1 mm. When the thickness is less than 0.1 mm, the followability is reduced, and it becomes impossible to perform suitable bonding to a complicated-shaped bonded portion having irregularities or the like. On the other hand, if it exceeds 1 mm, the formed adhesive layer 14 becomes thick and the weight of the resultant adhesive sheet-like foam 10 increases, as in the case of the above-mentioned excess basis weight.
[0038]
The final step S4 is a step performed by the collecting unit 38 that collects the obtained long sticky sheet-like foam body 10 by winding it while inspecting it. At this time, since the temperature of the pressure-sensitive adhesive layer 14 formed on the sheet-like foam 12 is already lower than the melting temperature, the pressure-sensitive adhesive layer 14 does not exhibit tackiness and can be wound without any particular problem. In this case, the obtained adhesive sheet-like foam 10 is shipped as a product in a form in which a long object is wound up. In addition, the adhesive sheet-like foam 10 is obtained immediately upstream of the collection unit 38. The long sticky sheet-like foam 10 may be configured to be cut into a predetermined length by a cutting mechanism that cuts the sheet into a predetermined length. In this case, the sticky sheet-like foam 10 may have a plurality of pieces. Of a predetermined length (for example, 1 m × 1 m, 1 m × 2 m).
[0039]
When the adhesive sheet-like foam 10 is used, a heating device such as a far-infrared heater or the like is used to reactivate the reactivated hot-melt adhesive M that forms the adhesive layer 14 to develop adhesiveness. It is stuck on the required stuck part. At this time, the time during which the adhesiveness is exhibited by heating is called the pot life (open time), and the pot life is set to be about 5 to 10 seconds. If this time is less than 5 seconds, after heating, the time required for sticking to a required part to be stuck is insufficient, and workability is greatly deteriorated. On the other hand, if the time is longer than 10 seconds, there is a problem that the position of the adhered sheet-like foam 10 is shifted due to its own weight or the like after being adhered to the adhered portion.
[0040]
In addition, in the manufacturing apparatus 30, the reactivated hot-melt adhesive M is applied to only one surface of the supplied long object 20 to form the adhesive layer 14. If the adhesive application step S2, the adhesive layer forming step S3, and the final step S4 are repeatedly performed with the long sticky sheet-like foam body 10 obtained from the apparatus 30 reversed, as shown in FIG. Thus, the adhesive sheet-like foam 40 having the adhesive layers 14, 14 formed on both surfaces is obtained. In this case, even if the reactivated hot-melt adhesive M melted in the adhesive application section 34 is applied, the already formed adhesive layer 14 has a sheet-like foam having a structurally heat insulating property called a foam. The body 12 does not conduct heat and therefore does not remelt or reactivate.
[0041]
In addition, the adhesiveness of the adhesive layer in the adhesive sheet-like foam according to the present invention, regardless of the material of the portion to be adhered, various metals, PP, PE, olefins, plastic resins such as ABS or nylon, Wood, paper, and the like can also be suitably used. Therefore, it can also be suitably used as a cushioning material or a sealing material used for automobile parts other than interior materials of automobiles, OA equipment, general home appliances, furniture, various building materials, and the like.
[0042]
In addition, as a material constituting the sheet-like foam 12, the description has been given by using a polyurethane-based resin. However, as described above, a resin such as phenol or melamine can be used as the material, and the foam made of the resin is , Manufactured by a conventionally known method. For example, in the case of a foam made of a melamine resin, for the melamine resin as a main raw material, a necessary foaming agent, a foaming aid, an emulsifier, a surfactant, a pH adjuster, a foaming solvent such as pentane, and the like. A required amount of a curing catalyst such as formic acid is mixed and kneaded, and the mixture is weighed, discharged onto a desired belt conveyor, and foamed and cured by microwave irradiation or the like to produce a sheet-like foam.
[0043]
【The invention's effect】
As described above, according to the adhesive sheet-like foam and the method for producing the same according to the present invention, the reactive hot-melt adhesive is applied to the foam serving as the base material to form an adhesive layer. As a result, the adhesive sheet-like foam which does not require the release paper, that is, the time required for removing the release paper is not required, and the cost required for the release of the release paper and the processing of the release paper after peeling, etc. By reducing the number and the like, it is possible to greatly improve the production efficiency and the handleability, and to produce a sticky sheet-like foam having a reduced production cost.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view showing a sticky sheet-like foam according to a preferred embodiment of the present invention.
FIG. 2 is a flowchart illustrating a method for manufacturing a sticky sheet-like foam according to an example.
FIG. 3 is a schematic view showing an example of a production apparatus for producing a sheet-like foam to be adhered according to an example.
FIG. 4 is a partially cutaway perspective view showing a sticky sheet-like foam according to another embodiment.
FIG. 5 is a perspective view showing a partially cut sheet-like foam according to the related art.
FIG. 6 is a schematic view showing an example of a production apparatus for producing a pasted sheet foam according to the related art.
[Explanation of symbols]
12 sheet foam
14 Adhesive layer
20 long objects
M Reactivated hot melt adhesive

Claims (10)

It is composed of a sheet-like foam (12) and an adhesive layer (14) formed on at least one surface of the foam (12), and is adhered to a required part to be adhered through the adhesive layer (14). In the sticking sheet foam to be worn,
The pressure-sensitive adhesive sheet-like foam, wherein the pressure-sensitive adhesive layer (14) is formed by applying a reactive hot-melt adhesive (M). The reactivated hot melt adhesive (M) has a reactivated temperature set in the range of 100 to 150 ° C. and a viscosity at the time of application set in the range of 12 to 18 Pa · S (12000 to 18000 cps). The sticky sheet-like foam according to claim 1. The adhesive sheet-like foam according to claim 1, wherein the pressure-sensitive adhesive layer (14) of the reactivated hot melt adhesive (M) is formed to a thickness of 0.1 to 1 mm. The adhesive sheet-like foam according to claim 1 or 3, wherein the adhesive layer (14) of the reactivated hot melt adhesive (M) has a pot life after reactivation set to 5 to 10 seconds. The sticking sheet-like foam according to any one of claims 1 to 4, wherein the reactivated hot melt adhesive (M) is an olefin-based substance. Continuously supply a long object (20) of the sheet-like foam (12) manufactured in a separate process in advance,
In the process of continuously supplying the long object (20), the molten reactivated hot melt adhesive (M) is applied to at least one surface of the long object (20),
Manufacturing a long sticking sheet-like foam on which a pressure-sensitive adhesive layer (14) made of the reactivated hot melt adhesive (M) is formed. Method. The method for producing a sheet-like foam for application according to claim 6, wherein the melting temperature of the reactivated hot-melt adhesive (M) is set in a range of 150 to 170C. The sticking sheet according to claim 6, wherein the reactivated hot melt adhesive (M) is applied to at least one surface of the long object (20) in a weight per unit area of 5 to 100 g / m ^2. A method for producing a foam. The method for producing a sheet-like foam for application according to any one of claims 6 to 8, wherein the reactivated hot melt adhesive (M) is applied in a thickness of 0.1 to 1 mm. The method for producing a sticky sheet foam according to any one of claims 6 to 9, wherein the reactivated hot melt adhesive (M) is applied by a porous coat or a roll coater.

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