JP2000192013A - Sealant composition and sealant item prepared by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sealant composition which can effectively seal discontinuous parts while retaining such a flexibility as to relax stress and can prevent the penetration of dust, water, etc., by compounding a curable epoxy-containing material, a thermoplastic polyamide component, and a curing agent for the epoxy-containing material. SOLUTION: This composition, after the epoxy-containing material is cured, has an elongation of at least 2% at -20 deg.C. Preferably, the composition contains 10-60 wt.% epoxy-containing material and 30-70 wt.% thermoplastic polyamide component. An especially preferable epoxy-containing material is a glycidyl ether of a polyhydric phenol. Preferably, the thermoplastic polyamide component has a softening point not higher than the curing temperature of the epoxy- containing material. A sealant item 10 comprises a sealant layer 1 and a sticky layer 2 which is formed on one side thereof and on which a plurality of fine sticky spheres 3 are arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to sealant compositions and sealant articles, and more particularly to compositions for sealing discontinuities such as steps, joints, seams or cracks in vehicles. , And articles used in sealing the same.

[0002]

BACKGROUND OF THE INVENTION Vehicles, such as automobiles and trucks, have metal joints and seams, which are usually sealed. As an example, a common non-planar overlapping joint is formed by welding together the roof and side panels of a vehicle, finished at a right angle and forming a U-shaped groove called a roof ditch ( Trough). The roof ditch collects moisture and drains the vehicle.

In order to prevent moisture from seeping out of such a joint, it is necessary to seal the joint. However, it is often difficult to obtain a good seal because this joint is not flat. Also, the width of the roof ditch usually varies along its length, further complicating the possibility of a good seal. Under these circumstances, a wide variety of materials have heretofore been used as sealants to fill vehicle cavities and to eliminate dust, moisture and other undesirable components.

[0004] Sealants are supplied as liquid or solid materials depending on the requirements of the application. For example, in the automotive industry, roof ditch joints are usually sealed with a plastisol in paste form, then painted, baked and cooled to room temperature. Hot melt type sealants have also been used, which are generally solid thermoplastics, which melt rapidly on heating and form a firm bond on cooling. In use, a bead of molten liquid sealant is applied to a joint or seam, often in a caulking manner. Then the worker can grind or flatten the material,
Make a layer with a relatively uniform thickness. Applying the above described sealants requires skill and often results in poorly sealed joints or seams. Hot-melt sealants cannot be used to produce uniform and beautiful coatings because of the formation of uneven appearance. As a typical hot melt type sealant composition, polyolefin is used, but it is difficult to apply and has poor adhesion to the surface of non-polar materials such as steel and aluminum. are doing.

Recently, one trend has been toward more "user friendly" polyvinyl chloride based sealants, which are supplied in the form of ropes or tapes. Sealants supplied in such a form
It is disclosed in Japanese Patent Publication No. 9-505335. The sealant not only allows for quick installation due to the excellent handling properties of the constituent materials, but also obviates the need to treat the applied material in skilled operations.

[0006] Once the sealant has been applied to a given site, the exposed surface of the sealant is covered with a flexible plastic or rubber molding, which is, for example, painted and painted in a vehicle. Or the paint color may be completed. Alternatively, a metal molded product may be used. Such moldings are usually attached to the sealant surface using also mechanical fasteners and adhesives.

[0007] Vehicles are exposed to very low temperatures, such as -20 ° C or lower, such as -30 ° C to -40 ° C, especially when the vehicle is intended for use in extreme northern climates. There is a risk. Even under such extreme cold conditions, it is desirable that the sealant, especially the one used in the construction of the roof ditch, retains its practical flexibility at normal high temperatures. Such flexibility maintains that the sealant may crack, break, delaminate or lift at the surface where the sealant is applied, as a result of the stresses caused by normal vehicle use. Will be prevented. If the sealant does not have such properties, it may not only allow the ingress of dust, moisture and other undesirable components, but may also lead to unstable fixing of subsequently applied moldings. .

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, maintain the flexibility enough to relieve stress, and make the discontinuous portion effective. It is an object of the present invention to provide a sealant composition and a sealant article which can be effectively sealed and prevent intrusion of dust, moisture and other undesired components.

[0009]

According to the present invention, there is provided, according to the present invention, a curable epoxy-containing material, a thermoplastic polyamide component having a softening point below the curing temperature of the epoxy-containing material. And a curing agent for the epoxy-containing material, wherein the curing of the epoxy-containing material provides an elongation at −20 ° C. of at least 2%.

In a preferred embodiment of the present invention, the sealant composition according to the present invention is characterized in that
60% by weight and the thermoplastic polyamide component in an amount of 30-70% by weight. According to the present invention, there is also provided a sealant article comprising a molded sealant layer (hereinafter, also referred to as “first layer”) made of the sealant composition of the present invention.

In the sealant article of the present invention, in a preferred embodiment of the present invention, the sealant layer (first layer)
Is provided with an adhesive layer (hereinafter, also referred to as a "second layer") on one side of the substrate. The second layer, the sticky layer, preferably comprises a plurality of sticky microspheres.
In another preferred embodiment of the present invention, a release layer having a plurality of protrusions formed on the surface thereof is provided on the surface of the second layer having adhesiveness, and the protrusions of the release layer have at least the aforementioned It is brought into contact with the second layer.

Further, in another preferred embodiment of the present invention, the sealant layer is further provided with a flexible layer (hereinafter, also referred to as “third layer”). Here, the flexible third layer can be arranged at various positions, for example, it can be arranged inside the sealant layer, or the other surface of the sealant layer (ie, the adhesive layer) On the side opposite to the second layer having

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in accordance with embodiments with reference to the accompanying drawings. It will be readily apparent to those skilled in the art that the present invention is not limited to the embodiments described below. The cross-sectional view of FIG. 1 schematically shows a sealant article using the sealant composition of the present invention. The sealant article 10 includes a sealant layer (first layer) 1 made of a sealant composition, and is in the form of a rope, a tape, or a strip.

More specifically, when the first layer 1 is installed at a predetermined position, the sealant composition constituting the layer forms a protective seal portion to form an overlapping joint or seam, or a butt type. Cover discontinuities, such as joints or seams, dents or dents, or manufacturing defects, to prevent moisture, dust, snow, and other undesirable components from entering the discontinuities and causing corrosion. Can be prevented.

[0015] The sealant composition is believed to be melt flowable. That is, when the sealant composition is placed and heated to coat the joint, it first softens and conforms to the surface of the discontinuity, thereby pushing out the trapped air. In addition, during the thermal cycle, the sealant composition becomes hot and tacky and adheres to the surface. The sealant composition is thermosetting and cures by heating (ie, cross-links by covalent bonds) and prevents flow upon subsequent cooling and reheating.

Once cured, the sealant composition of the present invention exhibits excellent flexibility at low temperatures, as described in detail below, and is easily bent without cracking or breaking. Preferably, the cured sealant composition has, but is not limited to, an elongation of at least 10% when tested at -20 <0> C. Basically, the cured sealant composition has an elongation of at least 2% when tested at -20C. In such a case, paints used in automobiles will have about the same or lower elongation when cured at -20 ° C than the cured sealant composition. As a result, even if the cured sealant composition is exposed and its surface is coated with the above-described paint,
Cracking or breaking prior to the paint can be prevented. Thus, the sealant composition can maintain the discontinuity coverage to avoid penetration of moisture, dust, snow, and other undesirable components into the discontinuity.

The sealant composition in the first layer comprises, and more preferably consists of, an epoxy-containing material, a thermoplastic polyamide component and a curing agent for the epoxy resin. Epoxy-containing materials contribute to the ultimate strength and heat resistance of the sealant composition, while the thermoplastic polyamide component imparts shape conformability, flexibility and flexibility, especially at low temperatures. Also, the curing agent enables the curing of the sealant composition. Preferably, the curing agent is thermally activated,
The sealant composition acts to cure upon exposure to a suitable heat source at a suitable time.

Useful epoxy-containing materials are epoxy resins having at least one oxirane ring polymerizable by a ring opening reaction. Such materials are broadly referred to as epoxides and include unimolecular and polymeric epoxides,
It can be aliphatic, cycloaliphatic or aromatic. Such materials generally have on average two epoxy groups per molecule, preferably two or more epoxy groups. Such materials are also specifically referred to as polyepoxides and include epoxy-containing materials having an epoxy functionality of slightly less than 2.0, for example, 1.8. The average number of epoxy groups per molecule is defined as the number of epoxy groups in the epoxy-containing material divided by the total number of epoxy molecules. The polymer epoxide includes a linear polymer having an epoxy group terminal (for example, diglycidyl ether of polyalkylene glycol) and a polymer having a skeleton of oxirane (for example, polybutadiene polyepoxide). The molecular weight of the epoxy-containing material is about 58-10
It may vary up to 0000. Also, mixtures of various epoxy-containing materials can be used.

Useful epoxy-containing materials include 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, 3,4-epoxy-2-methylcyclohexylmethyl-3,4-epoxy-2-methylcyclohexane Carboxylic acid esters and cyclohexene oxide groups such as epoxycyclohexanecarboxylic acid esters represented by bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate are included.

Particularly useful epoxy-containing materials are glycidyl ethers of polyhydric phenols obtained by reacting polyhydric phenols with chlorohydrin such as epichlorohydrin in excess (eg, 2,2-bis-
(2,3-epoxypropoxyphenol) diglycidyl ether of propane).

As listed below, many epoxy-containing materials are commercially available and can be used in the practice of the present invention. In other words, from Yuka Ciel, Epikote 100
1, Epikote 1002, Epikote 1003, Epikote 1004, Epiko
It is marketed under the product name te 828 or Epikote 154. The sealant composition of the present invention also contains a thermoplastic polyamide component. The thermoplastic polyamide component has an amide moiety represented by the following general formula:

[0022]

Embedded image

Reference is made to polymeric materials including, and such materials have thermoplastic processing properties. That is, the material is softened by heating and flows to give a shape, and is solidified by cooling. In addition, the material softens again upon reheating. Such polyamide components can not only achieve desirable mixing with the epoxy-containing material, but can also achieve such mixing with components of other sealant compositions that promote curing of the epoxy-containing material. Also, the thermoplastic polyamide component ensures excellent low temperature properties of the sealant composition, for example, flexibility.

The desired thermoplastic polyamide component mixes (ie, melt-mixes) with the epoxy-containing material in the molten phase, but forms a uniform single-phase mixture when the epoxy-containing material is not cured. The formation of a uniform single phase is evident in such a mixture (melt-mix) becoming transparent. Preferably, the polyamide component is contained in an amount of 90 to 350 parts by weight based on 100 parts by weight of the epoxy-containing material. About 90 polyamide components
If the content is less than the weight part, the cured sealant composition tends to become brittle. On the other hand, when the polyamide component is contained in an amount of more than about 350 parts by weight, the cured sealant composition is not sufficiently crosslinked, and tends to flow by reheating. However, if the epoxy-containing material cures, a multi-phase or separate phase composition results, one phase resulting from the cured epoxy-containing material and the other phase resulting from the thermoplastic polyamide component. Occurs as However, since both phases are formed from a single, uniform phase consisting of an epoxy-containing material and a thermoplastic polyamide component, even if the epoxy-containing material cures as described above, both phases will be unevenly distributed. I will not do it. Therefore, the properties derived from the epoxy-containing material and the thermoplastic polyamide component are imparted to the sealant composition.

Also, the desirable thermoplastic polyamide component has a softening point below the curing temperature of the epoxy-containing material. In this case, the curing of the epoxy-containing material during molding of the sealant composition is suppressed. Also,
The sealant composition can be melted by heating and easily penetrate into the discontinuous portion. Typically, when the sealant composition is used in the automotive industry, the thermoplastic polyamide component has a softening point of about 180 ° C or less.

The sealant composition contains a curing agent and cures the epoxy-containing material that is also included. Preferably, the curing agent is thermally activated to effect curing of the epoxy-containing material under the influence of heat. For example,
Useful curing agents that are thermally activated include amide groups, including amines, or imidazole. Preferably, dicyandiamide is typical as a curing agent having an amide group. As a curing agent having imidazole, a triazine derivative is typical. A dicyandiamide curing agent is commercially available, for example, from AC R under the product name "EH3636". Further, a curing agent for a triazine derivative is commercially available, for example, from Shikoku Chemicals Co., Ltd. under the product name of "2MZA".

The sealant composition may further contain, if necessary, a filler made of, for example, calcium carbonate or silica powder, a plasticizer made of a phthalic acid derivative or a liquid rubber,
For example, an antioxidant commercially available from Ciba Geigy under the product name "Ilganox 1010", such as Ciba Geigy
UV absorber commercially available under the product name "TINUVIN (registered trademark) P" from Geigy, or "FC361" from 3M.
And other additives such as surfactants marketed under the product name "".

The sealant composition in the first layer (sealant layer) is solid at room temperature. Desirably, the sealant composition will have some tack at room temperature or slightly below. Such tacking is because the positioning of the sealant composition or an article containing it can be performed first to cover joints or seams, for example, in the roof ditch of a vehicle. In particular, if the sealant composition is in the form of a rope, tape or strip, it can be quickly installed and obviate the need for skilled and troublesome treatment of the applied material. However, it is expected that the sealant compositions of the present invention will be substantially tack free at room temperature. In the case of such a sealant composition having substantially no tack, as shown in FIG. 1, a second layer 2 having an adhesive property to one surface of a first layer 1 including the same is provided, and It is desirable to enable positioning of The adhesive second layer 2 is formed, in particular, also as shown in FIG. 1, by disposing a plurality of adhesive microspheres 3 uniformly at a distance from each other and having a sufficient adhesive surface, Preferably, there is at least one channel leading to the outside of the air trapped in the continuation. Such a channel pushes air trapped in the discontinuity to the outside,
The sealant composition can act to minimize this air from remaining between the discontinuity and the sealant composition. As a result, when the sealant composition is softened by heating, it becomes more conformable to the surface of the discontinuous portion. Further, even if the remaining air expands due to heating and subsequently contracts due to cooling, local formation of dents or dents on the exposed surface of the sealant composition is also suppressed, resulting in excellent appearance. A surface can be obtained. Preferred adhesive microspheres are made of an acrylic polymer material. In addition, the adhesive microspheres are 30 to 50
It is desirable to form a good channel with a particle size of 0 μm.

Further, a release layer may be provided on the surface of the adhesive second layer, so that quick installation can be performed. FIG. 2 shows an example in which a release layer 4 having a projection on one surface is brought into contact with the surface of the projection on the surface of the second layer 2 of the sealant article 10. The pattern of the protrusions of the release layer 4 used here can be easily understood from the perspective view of the release layer 4 of FIG.

A particularly desirable release layer in the practice of the present invention is one in which a plurality of protrusions are arranged at intervals on at least one surface of the layer. In this case, when at least the protrusion on the surface of the release layer is in contact with the second layer, the adhesive surface of the second layer can be partially excluded to form a channel. Therefore, if such a projection has a sharp tip, the channel can be created more efficiently. Alternatively, the second layer may be one in which the above-mentioned adhesive microspheres are provided at intervals or uniformly. Further, a plurality of continuous sharp projections that preferably intersect each other or are orthogonal to each other as shown in FIG. 3 are provided at regular intervals so that air can be pushed out isotropically. A channel may be formed. Such a release layer is commercially available, for example, from 3M as "EA Liner (TM)".

According to another preferred embodiment of the invention,
In the sealant article of the present invention, the third layer having flexibility may be provided on the surface or the other face of the first layer (sealant layer). Entrapped air can be prevented from reaching the surface of the first layer. 4 and 5 show preferred examples of the arrangement of the third layer. The sealant article 10 of FIG. 4 has the third layer 5 on the surface of the first layer 1 opposite to the second layer 2. Also, the sealant article 10 of FIG. 5 has a third layer between the two first layers 1 and 11.
Layer 5. Desirable third layers are flexible or conformable and do not trap air at the interface between the first and third layers. Preferably, such a third
Is, for example, polyethylene terephthalate (PET)
Or, it is made of polyethylene (PE).

A particularly preferred flexible third layer is described in, for example, "Expancel" from Nippon Philite Co., Ltd.
l) It has porosity, including plastic bubbles (not shown) sold under the trademark "". The porous third layer tends to uniformly disperse the air trapped in the discontinuous portion by capillary action or the like. In particular, such dispersion is promoted when the first layer is cured by heating. When the sealant composition is subsequently cooled to room temperature, local shrinkage of such air is suppressed and the sealant composition tends to shrink uniformly. As a result, local dents or depressions tend to be less noticeable. Alternatively, irrespective of whether the flexible layer has porosity or not, a filler made of whiskers or nonwoven cloth which is uniformly distributed may be included therein to capture such air.

Each of the above-mentioned adhesive layer and release layer is not only applied to the sealant composition of the present invention, but is also applied to all other sealant compositions. For example, with respect to the application of the adhesive layer and the release layer, the sealant composition may comprise a thermoplastic polyurethane component or a polyester component instead of the thermoplastic polyamide component referred to herein. In particular, when the sealant composition is 30 to 7
In the case of containing 0% by weight of a thermoplastic polyurethane component or polyester component, the following seam seal test, temperature cycle test, evaluation of elongation at low temperature or evaluation of the seal of an overlap type joint are also performed. Shows excellent properties. Such thermoplastic polyurethane components are, for example, available from Takeda Birdish Urethane Co., Ltd.
0 "and having a softening point of
It has an elongation of 100% or more at 20 ° C. A thermoplastic polyester component is also commercially available from Huls (USA) under the product name "Dynapol S1402" and has a softening point of 80 ° C.

[0034]

EXAMPLES The present invention will be described below with reference to examples, but it goes without saying that the present invention is not limited to these examples. Example 1 A thermoplastic polyamide component (product name: Macromelt 6238) manufactured by Henkel was prepared. This thermoplastic polyamide component has a softening point of 135 ° C and 130% at -20 ° C.
Elongation rate of In addition, an epoxy-containing material (product name: Epikote1001) manufactured by Yuka Shell Co., Ltd. was also prepared. Also, a curing agent was prepared by mixing dicyanamide (product name: EH3636) manufactured by AC R and a triazine derivative (2MZA) manufactured by Shikoku Chemicals Co., Ltd. at a weight ratio of 2: 1.

Next, 50 parts by weight of a thermoplastic polyamide component, 40 parts by weight of an epoxy-containing material, and 10 parts by weight of a curing agent were uniformly mixed to obtain a sealant composition. Further, the sealant composition was charged into an extruder and processed into a sheet (sealant article) having a thickness of 2.0 mm. Further, a test substrate was manufactured as follows. First, a 25 mm wide, 1 mm long steel strip made of cold-rolled steel and having a width of 25 mm, a length of 150 mm, and a thickness of 0.8 mm was formed.
50 mm and 0.8 mm thick glass flat plates were overlaid and attached using double-sided adhesive tape. The steps that fell from the steel strip into the glass plate simulated the bottom seam of the vehicle's roof ditch. Also, after cutting the above uncured sheet into rectangular strips having a length of 100 mm and a width of 20 mm, they were arranged so as to cover one end of a steel strip, heated at 120 ° C. for 10 minutes, and then at 140 ° C. Heat for 40 minutes. Then, after the test substrate is cooled down to room temperature, a simulated seam (represented by a step falling from the steel strip into the glass plate) is visually inspected through the glass plate, and a simulation test is performed to seal the seam. did. In the case of this example, the sealant composition melts and flows along the length of the sheet cut as described above to cover the steel strip, and the gap between the surface of the glass flat plate and the surface of the steel strip. It was found that the voids were filled.

A simulated roof ditch for an automobile was also manufactured. First, it has a thickness of 1 mm and is an automotive grade electrodeposition coating (Nippon Paint Co., Ltd., E-coating U-600 Black)
The cold-rolled steel sheet subjected to bending is bent to a length of 25 mm and 8
A right-angled U-shaped groove (trough) having a width of 3 mm and a depth of 3 mm was formed. The uncured sheet was then cut into rectangular strips 25 mm long and 8 mm wide and placed at the bottom of the roof ditch groove. The sheet was heated at 120 ° C. for 10 minutes to cure the sealant composition, and then cooled to room temperature. The sealant composition was then coated by spraying a standard automotive primer made of a high solids type polyester crosslinked with melamine alkyd, and then cured by heating at 140 ° C. for 20 minutes. After cooling to room temperature, spray the base paint used for car body coating made of high solid type polyester cross-linked with melamine alkyd,
Cured by heating at 140 ° C. for 30 minutes, then cooled to room temperature. Thereafter, an aging test was performed on the coated sealant composition by a temperature cycle.

In the aging test by temperature cycling, one cycle is performed at -30 ° C. for 2 hours, then at room temperature (about 23 ° C.) for 2 hours, and then at 70 ° C.
And 2 hours. After the lapse of 5 cycles, the condition of the sealant composition in the groove of the roof ditch was visually inspected, and no difference was observed in the appearance of the sealant composition before and after the test.

The evaluation of the elongation at a low temperature was also performed as follows. First, the uncured sealant composition was heated at 140 ° C. for 30 minutes and then cooled to room temperature. Next, a test piece of the cured sample was punched into a dumbbell No. 1 in accordance with Japanese Industrial Standards (JIS) K-6251. The specimen was then marked to show two parallel lines 40 mm apart from each other. Next,
This test piece was subjected to a tensile test using a tensile tester manufactured by Orientic Corporation having a temperature controllable chamber. Specifically, the specimen was mounted on two movable clamps about 60-70 mm apart. The test piece was placed in the chamber for -20.
At 20 ° C. for 20 minutes, the clamp was pulled at a speed of 50 mm / min until the specimen broke. The elongation (%) at break was calculated according to the following equation.

[0039]

(Equation 1)

In the above equation, A is the distance (mm) between the two parallel lines when the test piece breaks. The elongation percentage of the sealant composition of this example was 10%. Such elongation prevents the sealant from cracking, breaking, delaminating or lifting from surfaces applied as a result of stresses caused by the use of the vehicle at low temperatures. There will be. This not only allows the ingress of dust, moisture and other undesirable constituents, but can also reduce the insecure fixing of the subsequently applied moldings described above.

A hot water immersion test was also conducted as follows. First, a steel plate coated with electrodeposition (65 mm x 150 m
m) above the uncured sheet (25 mm x 40 m
m) was placed and heated at 120 ° C. for 10 minutes to produce a sample. Next, after cooling the sample to room temperature, a primer of an automobile paint was sprayed to cover the sheet. Subsequently, the sample was cured by heating at 140 ° C. for 20 minutes. After at least 10 minutes of cooling, the base paint of the automobile was sprayed on to coat the primed sealant composition. The sample was cured by heating at 140 ° C. for 20 minutes and then cooled to room temperature. The above-mentioned electrodeposited steel sheet, paint primer and base paint are all the same as those used in the above-mentioned temperature cycle test. Thereafter, the obtained sample was immersed in warm water of 40 ° C. for 250 hours. A visual inspection of the sealant composition before and after immersion in the warm water revealed no difference in appearance.

The evaluation of the seal of the overlap type joint was also performed as follows. First, two steel plates having a thickness of 0.8 mm and having the same electrodeposition as that used in the above-described temperature cycle test were overlapped and welded to form a joint. Next, the above uncured sheet (20 mm × 1
00mm) on the joint, at 95 ° C for 10 minutes,
Then heated at 140 ° C. for 36 minutes. After cooling, the sheet was visually inspected to show the desired tendency of the sealant composition to seal the joint and flow into the joint to adhere the steel sheet.

Further, a surface appearance test was also conducted as follows. First, by bending two sheets of the same electrodeposition coated steel sheet as mentioned in the above-mentioned temperature cycle test into a U-shaped groove finished at a right angle, and superimposing them and performing spot welding, A simulated roof ditch for a car was created. The dimensions of the simulated roof ditch of this vehicle were 20 mm wide, 10 mm deep, and 300 mm long, with a seam or joint welded to the bottom of the simulated roof ditch. In addition, a recess or dent having a diameter of about 5 mm and a depth of about 0.8 mm
Ten were formed at the bottom of the ditch. The uncured sheet was chopped into straps 19 mm wide and 300 mm long and then placed at the bottom of a simulated roof ditch. Thereafter, the specimen was heated at 100 ° C. for 10 minutes, subsequently at 140 ° C. for 20 minutes and cooled to room temperature. When the simulated roof ditch treated as described above was visually inspected, especially in the area of the dent, the sealant composition formed a concave surface after the test. Therefore, in the area of the dent, it was found that the sealant composition did not satisfy the desired tendency and did not sufficiently fill the dent.

Of the evaluation tests described above, the results of the simulation test for sealing the seam, aging by temperature cycling, elongation at low temperature, and immersion in hot water for 250 hours are shown in Table 1 below. The results are described together with the result of No. 1. Example 2 The procedure described in Example 1 was repeated, but in this example, instead of applying the surface appearance test described above to the uncured sheet used in the test, It was applied to a sheet on one side of which 3 g of adhesive microspheres having a particle size of 35 μm manufactured by 3M were uniformly applied at 7 g / m ² . The sealant composition formed a solid surface after the test. Therefore, it was found that in the area of the dent, the sealant composition satisfied the desired tendency and filled the dent sufficiently. Example 3 The method described in Example 2 was repeated, but in the case of this example, the surface appearance test of Example 2 was applied to the sheet with the non-cured adhesive microspheres used in the test. Instead, a film of polyethylene terephthalate (PET) from ICI-Dupont having a thickness of 125 μm (Melinex # 316) was applied to the other side of the sheet. The sealant composition formed a solid surface after the test. Therefore,
In the area of dents, it has been found that the sealant composition satisfies the desired tendency and sufficiently fills the dents. Comparative Example 1 The same procedure as in Example 1 was performed except that a thermoplastic polyamide component (product name: Macromelt 6217) manufactured by Henkel was used instead of the thermoplastic polyamide component (product name: Macromelt 6238) manufactured by Henkel. In the same manner, a sealant composition was prepared and its sheet was formed. This thermoplastic polyamide component has a softening point of 112-122 ° C and -20 ° C.
With an elongation of 8%. Almost as in the first embodiment,
A simulation test for sealing the seam, aging by temperature cycling, elongation at low temperature, and evaluation tests of immersion in hot water for 250 hours were performed. However, as shown in Table 1 below, in the evaluation of the elongation at low temperature, the elongation of the sealant composition of this example was 1% or less. Also, from aging due to temperature cycling, the comparative sealant composition may crack, break, delaminate or lift from surfaces applied as a result of stresses caused by normal vehicle use. all right. Therefore, when such a sealant composition is used, not only the intrusion of dust, moisture and other undesired components is allowed, but also the molding to be subsequently applied is unstablely fixed. The possibilities are great. .

[0045]

[Table 1]

[0046]

As described above, according to the present invention, it is possible to effectively seal the discontinuity by maintaining flexibility enough to relieve stress, and to prevent dust, moisture and other undesired components. A sealant composition and a sealant article that can prevent intrusion can be obtained. In particular, the sealant composition and the sealant article of the present invention can maintain their excellent properties even under severe cold conditions, such as flexibility, so that the sealant cracks, breaks, or causes delamination. Can be prevented from lifting or lifting, so that not only the intrusion of dust, moisture and other undesired components can be prevented, but also a molded article to be subsequently applied can be stably fixed. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one preferred embodiment of a sealant article according to the present invention.

FIG. 2 is a cross-sectional view showing another preferred form of the sealant article according to the present invention.

FIG. 3 is a perspective view showing a release layer used in the sealant article shown in FIG. 2;

FIG. 4 is a cross-sectional view illustrating yet another preferred form of the sealant article according to the present invention.

FIG. 5 is a cross-sectional view illustrating yet another preferred form of the sealant article according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sealant layer (1st layer) 2 ... Adhesive layer (2nd layer) 3 ... Adhesive microspheres 4 ... Release layer 5 ... Flexible layer (3rd layer) 10 ... Sealant article 11 … Sealant layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4H017 AA04 AA39 AB08 AB17 AC02 AC16 AC17 AD05 AE05 4J002 CD021 CD051 CL002 ET006 EU116 FD146 GJ02

Claims (9)

[Claims] An epoxy-containing material comprising: a curable epoxy-containing material; a thermoplastic polyamide component having a softening point equal to or lower than a curing temperature of the epoxy-containing material; and a curing agent for the epoxy-containing material. The elongation at −20 ° C. is at least 2%. 2. The composition according to claim 1, wherein said epoxy-containing material comprises 10 to 60% by weight and said thermoplastic polyamide component comprises 30 to 60% by weight.
The sealant composition according to claim 1, comprising 70% by weight. 3. A sealant article comprising a molded sealant layer comprising the sealant composition according to claim 1. 4. The sealant article according to claim 3, wherein an adhesive layer is provided on one surface of the sealant layer. 5. The sealant article according to claim 4, wherein said adhesive layer includes a plurality of adhesive microspheres. 6. The adhesive layer according to claim 4, further comprising a release layer having a plurality of projections formed on the surface thereof, wherein the projections are in contact with at least the adhesive layer. A sealant article according to claim 1. 7. The sealant article according to claim 3, wherein a flexible layer is further provided on the sealant layer. 8. The sealant article according to claim 7, wherein said flexible layer is disposed inside said sealant layer. 9. The sealant article according to claim 7, wherein said flexible layer is attached to the other side of said sealant layer.