JP7161864B2 - Encapsulant with surface protection base material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sealant with a surface protective substrate, which seals holes, gaps, recesses, or the like, and has surface protective substrates on both sticking surfaces of the sealant.

2. Description of the Related Art Conventionally, there has been known a sealing material formed into a self-supporting shape in an uncured state (see Patent Document 1, for example). Unlike liquid adhesives, this type of sealing material does not have the problem of dripping from immediately after use until it hardens, and there is no need to discharge an appropriate amount of liquid from a container such as a tube. For this reason, the sealing material is suitably used for sealing gaps that occur during construction of a concrete building, or for sealing holes and cracks that occur as the building deteriorates over time. .

A representative example of the sealing material is a moisture-curable silicone rubber, which is formed into a sheet-like shape or a narrower cord-like shape. The encapsulant has the property of curing under the action of moisture in the air when exposed to air. The sealing material generally has a film-like surface protection substrate on both sticking surfaces. The sealing material having surface protection substrates on both sides is enclosed in a moisture-proof bag during storage, and is taken out of the moisture-proof bag during use. Both the surface protection substrate and the moisture-proof bag have the function of preventing the sealing material from absorbing moisture and hardening.

JP 2005-187686 A

When the sealing material is attached to a surface such as concrete, the surface protective base material on one side of the sealing material is peeled off, and the surface protective base material on the other side is attached. It is common to stick the side to the adherend surface such as concrete. After curing the encapsulant, the remaining surface protective substrate is peeled off. Such an affixing process helps prevent dust and dirt from adhering to the encapsulant between the time the encapsulant is affixed and cured.

However, there is a need for further improvements in encapsulants suitable for the above uses. When attaching a sealing material to a curved surface such as a U-shaped groove, the high rigidity of the surface protection base material left on the surface of the sealing material allows the sealing material to adhere to the curved surface. It can be difficult to let The problem will be described below with reference to the drawings.

FIG. 7 is a cross-sectional view (7A) of a sealing material with a conventional surface protective base material, and the exposed surface of the sealing material is attached to the curved surface of the adherend while leaving the surface protective base material on one side of the sealing material. A cross-sectional view (7B) of the attached state is shown, respectively.

As shown in (7A), the sealing material 100 with a surface protection base material is a semi-solid sheet-shaped sealing material 110, and a film on both the bonding surfaces 110a and 110a of the sealing material 110. It has a structure with surface protection substrates 111 , 111 . The surface protection substrate 111 is conventionally made of oriented polypropylene (OPP), a resin that is difficult to stretch and has high rigidity. When the sealing material 110 is attached to the adherend surface C, the surface protection substrate 111 is peeled off from one attachment surface 110a of the sealing material 110, leaving the surface protection substrate 111 on the other attachment surface 110a. The exposed sticking surface 110a is stuck to the curved adherend surface C. As shown in FIG. At this time, the surface protection base material 111 left on the outer surface of the encapsulant 110 tends to resist elongation of the encapsulant 110 because it is made of a material that is difficult to stretch. As a result, there is a risk of creating a gap G between the exposed sticking surface 110a of the sealing material 110 and the adherend surface C, as shown in (7B).

SUMMARY OF THE INVENTION The present invention has been made to meet the above demands for improvement, and it is an object of the present invention to provide a sealing material with a surface protective substrate that is less likely to cause gaps at the adhesive interface when the sealing material is attached to a curved surface. and

(1) A sealing material with a surface protective substrate according to one embodiment for achieving the above object is a moisture-curing semi-solid sealing material, and at least the bonding surfaces of both the sealing material One sticking surface is provided with a peelable film-like surface protective substrate, and at least one of the surface protective substrates provided on the sticking surface is made of stretched polypropylene having the same area and the same thickness in plan view. A stretchable base material that stretches more easily than the base material is used.

(2) In a sealing material with a surface protection base material according to another embodiment, preferably, the stretchable base material is a base material made of polyethylene.

(3) A sealing material with a surface protective substrate according to another embodiment is preferably any of the sealing materials with a surface protective substrate described above, in which surface protective groups are attached to both attachment surfaces of the sealing material. Only one surface protection base material is a stretchable base material, and the other surface protection base material is a base material that is less stretchable than the stretchable base material.

(4) In a sealing material with a surface protection substrate according to another embodiment, preferably, the stretchable substrate in any of the above-described sealing materials with a surface protection substrate is a plurality of strip-shaped substrates are disposed so as to partially overlap between adjacent substrates, and are configured to be easily bent in the arrangement direction of the strip-shaped substrates.

(5) In a sealing material with a surface protecting substrate according to another embodiment, preferably, the stretchable substrate in any of the above-described sealing materials with a surface protecting substrate has bellows-shaped first unevenness. The substrate is configured to be easily curved in the arrangement direction of the first unevenness.

(6) In a sealing material with a surface protection substrate according to another embodiment, preferably, the above-described sealing material has second unevenness in contact with the first unevenness of the stretchable substrate.

(7) In a sealing material with a surface protection substrate according to another embodiment, preferably, the stretchable substrate in any of the above-described sealing materials with a surface protection substrate has a plurality of slits arranged in parallel in one direction. It is arranged so that it can be easily bent in the parallel arrangement direction of the slits.

ADVANTAGE OF THE INVENTION According to this invention, the sealing material with a surface protection base material which is hard to produce a gap in an adhesive interface when sticking a sealing material on a curved surface can be provided.

FIG. 1 is a perspective view (1A) of a sealing material with a surface protection substrate according to the first embodiment of the present invention, and the sealing material with a surface protection substrate cut along line AA in (1A). A cross-sectional view (1B) taken along line AA in this case is shown. FIG. 2 shows a state in which the surface protection base material other than the stretchable base material is peeled off from the sealing material with the surface protection base material of FIG. shows a cross-sectional view of FIG. 3 is a cross-sectional view (3A) similar to (1B) of the sealing material with a surface protection substrate according to the second embodiment of the present invention, and a portion other than the stretchable base material from the sealing material with the surface protection substrate. A cross-sectional view (3B) of a state in which the surface protection substrate is peeled off and the peeled sticking surface is stuck to the adherend surface C as the curved surface portion is shown. FIG. 4 is a cross-sectional view (4A) similar to (1B) of the sealing material with a surface protection substrate according to the third embodiment of the present invention, and a part other than the stretchable base material from the sealing material with the surface protection substrate. 4B shows a cross-sectional view (4B) of a state in which the surface protection base material is peeled off and the peeled sticking surface is stuck to the adherend surface C as the curved surface part. FIG. 5 is a plan view (5A) of a sealing material with a surface protection substrate according to the fourth embodiment of the present invention, a cross-sectional view (5B) similar to (1B), and from the sealing material with a surface protection substrate A cross-sectional view (5C) of a state in which the surface protection substrate other than the stretchable substrate is peeled off and the peeled sticking surface is stuck to the adherend surface C as the curved surface portion is shown. FIG. 6 shows a perspective view of a sealing material with a surface protection substrate according to a fifth embodiment of the present invention and an enlarged view of a part D thereof. FIG. 7 is a cross-sectional view (7A) of a sealing material with a conventional surface protective base material, and the exposed surface of the sealing material is attached to the curved surface of the adherend while leaving the surface protective base material on one side of the sealing material. A cross-sectional view (7B) of the attached state is shown, respectively.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In addition, each embodiment described below does not limit the invention which concerns on a claim. Moreover, not all of the elements and combinations thereof described in each of the embodiments are essential to the solution of the present invention.

(First embodiment)
First, a sealing material with a surface protection base material according to the first embodiment will be described.

FIG. 1 is a perspective view (1A) of a sealing material with a surface protection substrate according to the first embodiment of the present invention, and the sealing material with a surface protection substrate cut along line AA in (1A). A cross-sectional view (1B) taken along line AA in this case is shown. In this specification, the term “planar view” means a state in which the encapsulant is viewed from directly above the surface of the encapsulant that has the largest area.

The sealant 1 with a surface protection substrate according to the first embodiment includes a moisture-curable semi-solid sealant 10 and a peelable film provided on both the bonding surfaces 10a and 10a of the sealant 10. and surface protection substrates 11 and 12 having a shape. The surface protection substrates 11 and 12 have the role of reducing the contact of the sealing material 10 with moisture in the air. This is to prevent the sealing material 10 from hardening before use. The surface protection substrates 11 and 12 are preferably substrates that have a larger area than the sealing material 10 and can completely cover the sealing material 10 in plan view.

The surface protection base material 11 of the surface protection base materials 11 and 12 provided on the sticking surfaces 10a and 10a is a base material made of oriented polypropylene (hereinafter referred to as "OPP"). In addition, the surface protection base material 12 is a stretchable base material that expands and contracts more easily than an OPP base material having the same area and the same thickness in plan view. The stretchable substrate, in this embodiment, is a polyethylene substrate that is softer, more stretchy, and less rigid than OPP. That is, the sealing material 1 with a surface protection substrate has surface protection substrates 11 and 12 on both sticking surfaces 10a and 10a of the sealing material 10, respectively, and only one surface protection substrate 12 is a stretchable substrate. , and the other surface protection base material 11 is a base material that is less stretchable than the stretchable base material. In addition, the surface protection base material 12 is hereafter called the "stretchable base material 12." In addition, in this embodiment and the following embodiments, the surface protection substrate 11 and the stretchable substrate have rectangular shapes with the same area in plan view, but they may have different shapes with different areas.

The sealing material 10 is a semi-solid (also referred to as semi-cured) moisture-curing sealing material formed into a sheet shape. Although there are no particular restrictions on the materials or components thereof, examples thereof include the following condensation reaction type curable silicone compositions or modified silicone compositions. A modified silicone-based composition is, for example, a composition obtained by modifying the molecular ends of a polyether-based oligomer with a silicone. The modified silicone-based sealing material causes a curing reaction due to moisture, similarly to the silicone-based sealing material. The condensation reaction type silicone-based or modified silicone-based composition may also be referred to as a one-part condensation-curing silicone sealant or a one-part condensation-type modified silicone sealant. The seal layer 10 absorbs moisture and hardens through a deoximation reaction, a dealcoholization reaction, or a deacetic acid reaction. Preferred examples of the above curable composition that constitutes the encapsulant 10 are mainly composed of the following components.

(a) Organopolysiloxane Diorganopolysiloxane, which is the main component of the condensation reaction type curable composition, is represented by the following chemical formula (1) or chemical formula (2).

In the chemical formulas (1) and (2) above, R is a monovalent hydrocarbon group. R is an alkyl group (methyl group, ethyl group, propyl group, butyl group, 2-ethylbutyl group, octyl group, etc.), cycloalkyl group (cyclohexyl group, cyclopentyl group, etc.), alkenyl group (vinyl group, propenyl group, butenyl group, heptenyl group, hexenyl group, allyl group, etc.), aryl group (phenyl group, tolyl group, xylyl group, naphthyl group, diphenyl group, etc.), aralkyl group (benzyl group, phenylethyl group, etc.), and the above carbonization Selected from those in which at least part of the hydrogen atoms bonded to the carbon atoms of the hydrogen group are substituted with halogens, cyano groups, etc. (chloromethyl group, trifluoropropyl group, 2-cyanoethyl group, 3-cyanopropyl group, etc.) one or more hydrocarbon groups can be mentioned. The number of carbon atoms in R is preferably 1-12, more preferably 1-10. In the above chemical formulas (1) and (2), A is an oxygen atom or a polymethylene group (including a methylene group) represented by -(CH ₂ ) _m - (m is 1 to 8). A is preferably an oxygen atom or an ethylene group.

In the above chemical formulas (1) and (2), n is an arbitrary number that makes the kinematic viscosity of component (a) at 25° C. fall within the range of 100 to 1,000,000 cm ² /s. More preferably, the kinematic viscosity is within the range of 500 to 500000 cm ² /s.

In the above chemical formulas (1) and (2), B is a hydrolyzable group. B includes an alkoxy group (methoxy group, ethoxy group, propoxy group, butoxy group, etc.), a ketoxime group (dimethylketoxime group, methylethylketoxime group, etc.), an acyloxy group (acetoxy group, etc.), an alkenyloxy group (isopropenyloxy group, isobutenyloxy group, etc.). Note that x in the above chemical formulas (1) and (2) is 2 or 3.

The above component (a) can be produced by a known method (for example, a method by equilibrium reaction using a cyclic siloxane or linear oligomer and an acid or base catalyst). When a branched structure is introduced into the diorganopolysiloxane as component (a), a silane or siloxane containing at least one of SiO _3/2 units and SiO _4/2 units is usually added during polymerization. A method of adding diorganopolysiloxane to such an extent that it does not gel can be used. Regarding the component (a), it is preferable to use it after removing the low-molecular-weight siloxane by washing or the like in order to reduce contamination.

(b) Cross-linking agent As the cross-linking agent, a silane having two or more, preferably three or more hydrolyzable groups in one molecule, or a partially hydrolyzed condensate of the silane is used. Examples of hydrolyzable groups include alkoxy groups (methoxy group, ethoxy group, butoxy group, etc.), ketoxime groups (dimethylketoxime group, methylethylketoxime group, etc.), acyloxy groups (acetoxy group, etc.), alkenyloxy groups (iso propenyloxy group, isobutenyloxy group, etc.), amino group (N-butylamino group, N,N-diethylamino group, etc.), amide group (N-methylacetamide group, etc.). Among these, it is preferable to use an alkoxy group, a ketoxime group, an acyloxy group, and an alkenyloxy group. The amount of the cross-linking agent is preferably in the range of 1 to 50 parts by mass, more preferably in the range of 2 to 30 parts by mass, more preferably 5 to 20 parts by mass, per 100 parts by mass of component (a). It is even more preferable to be within the range of parts.

(c) Curing Catalyst A curing catalyst is not essential, but curing can be accelerated by using a curing catalyst. Examples of curing catalysts include alkyltin ester compounds (dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dioctoate, etc.), titanate esters or titanium chelate compounds (tetraisopropoxytitanium, tetra-n-butoxytitanium, tetrakis(2- ethylhexoxy)titanium, dipropoxybis(acetylacetona)titanium, titanium isopropoxyoctylene glycol, etc.), other suitable organometallic compounds (zinc naphthenate, zinc stearate, zinc-2-ethyloctoate, iron-2 -ethylhexoate, cobalt-2-ethylhexoate, manganese-2-ethylhexoate, cobalt naphthenate, alkoxyaluminum compounds, etc.), aminoalkyl group-substituted alkoxysilanes (3-aminopropyltriethoxysilane, N -β (aminoethyl)γ-aminopropyltrimethoxysilane, etc.), amine compounds or their salts (hexylamine, dodecylamine phosphate, etc.), quaternary ammonium salts (benzyltriethylammonium acetate, etc.), alkali metal lower fatty acids salt (potassium acetate, sodium acetate, lithium oxalate, etc.), alkali metal lower fatty acid salt, dialkylhydroxylamine (dimethylhydroxylamine, diethylhydroxylamine, etc.), silane or siloxane having a guanidyl group (tetramethylguanidylpropyl trimethoxysilane, tetramethylguanidylpropylmethyldimethoxysilane, tetramethylguanidylpropyltris(trimethylsiloxy)silane, etc.). These may be used alone or as a mixture of two or more. The amount of the curing catalyst to be blended is preferably in the range of 0 to 20 parts by mass, more preferably in the range of 0.001 to 10 parts by mass, with respect to 100 parts by mass of component (a). More preferably, it falls within the range of 01 to 5 parts by mass.

(d) Filler A filler is not essential, but can be suitably used for purposes such as reinforcement. Examples of fillers include reinforcing agents (fumed silica, precipitated silica, silica obtained by hydrophobizing the surface of these silicas with an organic silicon compound, quartz powder, talc, zeolite, bentonite, etc.), fibrous fillers ( asbestos, glass fiber, organic fiber, etc.), basic fillers (calcium carbonate, zinc carbonate, zinc oxide, magnesium oxide, celite, etc.). Among these, it is preferable to use silica, calcium carbonate and zeolite, and it is more preferable to use fumed silica and calcium carbonate whose surface has been hydrophobized. The amount of the filler to be blended can be selected depending on the purpose and the type of filler, but it is in the range of 1 to 90% by volume and 5 to 60% by volume with respect to the component (a). is preferred.

(e) Adhesion-imparting component An adhesion-imparting component is not essential, but is preferably used. Examples of adhesion imparting components include amino group-containing organoalkoxysilanes (γ-aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, etc.), epoxy group-containing organoalkoxysilanes (γ-glycan sidoxypropyltrimethoxysilane, etc.), mercapto-containing organoalkoxysilanes (γ-mercaptopropyltrimethoxysilane, etc.), reaction mixtures of amino group-containing organoalkoxysilanes and epoxy group-containing organoalkoxysilanes. The amount of the adhesiveness imparting component is preferably in the range of 0.1 to 5 parts by mass per 100 parts by mass of component (a).

FIG. 2 shows a state in which the surface protection base material other than the stretchable base material is peeled off from the sealing material with the surface protection base material of FIG. shows a cross-sectional view of

The sticking surface 10a is a smooth surface. When the sealing material 10 is attached to the attachment surface C, the OPP surface protection substrate 11 is peeled off from the sealing material 10, and the exposed attachment surface 10a is curved along the curve of the attachment surface C. The stretchable substrate 12 remains attached to the encapsulant 10 . Since the sealing material 10 is a semi-cured sheet molded product, it can be deformed along the adherend surface C. As shown in FIG. Unlike the surface protection base material 11 , the stretchable base material 12 is highly flexible and stretchable, so that it can bend following the deformation of the sealing material 10 . Furthermore, unlike the surface protective substrate 11, the stretchable substrate 12 has low rigidity, so the reaction force to return to the smooth plate state is small. Therefore, the stretchable base material 12 does not have enough force to peel off the sealing material 10 from the adherend surface C. Therefore, the sealing material 10 can be held in close contact or close contact with the surface C to be adhered.

(Second embodiment)
Next, a sealing material with a surface protection base material according to the second embodiment will be described. In the second embodiment, redundant description of the parts common to the first embodiment will be omitted.

FIG. 3 is a cross-sectional view (3A) similar to (1B) of the sealing material with a surface protection substrate according to the second embodiment of the present invention, and a portion other than the stretchable base material from the sealing material with the surface protection substrate. A cross-sectional view (3B) of a state in which the surface protection substrate is peeled off and the peeled sticking surface is stuck to the adherend surface C as the curved surface portion is shown.

A sealing material 1a with a surface protecting substrate according to the second embodiment has a structure common to that of the sealing material 1 with a surface protecting substrate according to the first embodiment, except for the stretchable substrate 12a. For this reason, descriptions of the sealing material 10 and the surface protection substrate 11 will be omitted here, with reference to the description of the first embodiment.

The stretchable base material 12a is a base material in which a plurality of strip-shaped base materials 15 are arranged so as to partially overlap between adjacent base materials 15, 15, and the arrangement of the strip-shaped base materials 15 It is configured to be easily bent in a direction, that is, in the lateral direction of (3A). The stretchable base material 12 a is composed of a plurality of strip-shaped base materials 15 . The strip-shaped base material 15 is detachably attached to the sealing material 10 with a part of the base material 15 inclined so as to be in contact with the sticking surface 10a of the sealing material 10 .

The stretchable base material 12a is configured by partially overlapping a plurality of strip-shaped base materials 15 instead of a sheet of film. For this reason, as shown in (3B), the sealing material 10 is likely to bend following deformation. The elastic base material 12a is not particularly limited as long as it is easier to expand and contract than a base material made of drawn polypropylene having the same area and the same thickness in a plan view. For example, OPP may be used, but polyethylene is preferable. is.

(Third Embodiment)
Next, a sealing material with a surface protection base material according to the third embodiment will be described. In the third embodiment, redundant description of the parts common to the above-described embodiments will be omitted.

FIG. 4 is a cross-sectional view (4A) similar to (1B) of the sealing material with a surface protection substrate according to the third embodiment of the present invention, and a part other than the stretchable base material from the sealing material with the surface protection substrate. 4B shows a cross-sectional view (4B) of a state in which the surface protection base material is peeled off and the peeled sticking surface is stuck to the adherend surface C as the curved surface part.

A sealing material 1b with a surface protecting substrate according to the third embodiment has a structure common to the sealing materials 1 and 1a with a surface protecting substrate according to each of the above-described embodiments, except for the stretchable substrate 12b. For this reason, descriptions of the sealing material 10 and the surface protection substrate 11 will be omitted here, with reference to the description of the first embodiment or the second embodiment.

The elastic base material 12b is a base material having accordion-shaped first unevenness 16, and is configured to be easily curved in the arrangement direction of the first unevenness 16, that is, in the left-right direction of (4A). The encapsulant 10 also includes second unevenness 10b that contacts the first unevenness 16 of the stretchable base material 12b. That is, the surface of the sealing material 10 facing the surface protection substrate 11 is a smooth surface, while the surface facing the stretchable substrate 12b has the second unevenness 10b. The stretchable base material 12b is configured in a bellows shape so as to adhere to the second unevenness 10b of the sealing material 10 .

The stretchable base material 12b is not a smooth film, but has a shape in which a plurality of bellows-like line folds are arranged. The same applies to the sticking surface of the sealing material 10 on the side of the stretchable base material 12b. Therefore, as shown in (4B), the stretchable base material 12b tends to bend following the deformation of the sealing material 10 . The elastic base material 12b is not particularly limited as long as it is easier to expand and contract than a base material made of drawn polypropylene having the same area and the same thickness in a plan view. For example, OPP may be used, but polyethylene is preferable. is.

As a modification, the sticking surface of the sealing material 10 on the side provided with the stretchable base material 12b may be a smooth surface without the second unevenness 10b. In such a case, a slight gap is generated between the smooth surface and the stretchable base material 12b. However, if the gap is not excessively large, there is little risk that the sealing material 10 will harden unintentionally, so there is no problem in using the sealing material 10 .

(Fourth embodiment)
Next, a sealing material with a surface protection base material according to the fourth embodiment will be described. In the fourth embodiment, redundant description of the parts common to the above-described embodiments will be omitted.

FIG. 5 is a plan view (5A) of a sealing material with a surface protection substrate according to the fourth embodiment of the present invention, a cross-sectional view (5B) similar to (1B), and from the sealing material with a surface protection substrate A cross-sectional view (5C) of a state in which the surface protection substrate other than the stretchable substrate is peeled off and the peeled sticking surface is stuck to the adherend surface C as the curved surface portion is shown.

A sealing material 1c with a surface protection substrate according to the fourth embodiment has a structure common to the sealing materials 1, 1a, and 1b with a surface protection substrate according to each of the above-described embodiments, except for the stretchable substrate 12c. . Therefore, descriptions of the sealing material 10 and the surface protection base material 11 are omitted here, referring to the descriptions of the above-described embodiments.

The stretchable base material 12c has a plurality of slits 20 arranged in parallel in one direction (horizontal direction or lengthwise direction in 5A), and the parallel arrangement direction of the slits 20 (horizontal direction or lengthwise direction in 5A). It is configured to be easily curved. The slit 20 has an elongated shape in the width direction (vertical direction in 5A) of the stretchable base material 12c, and is shorter than the width of the stretchable base material 12c. The form of the slit 20 is preferably a form without a cut margin, that is, a form in which opposing cut surfaces of the slit 20 are in contact with each other when the stretchable base material 12c is not bent. This is to prevent moisture in the air from coming into contact with the sealing material 10 when the sealing material 10 is not in use. As long as the slits 20 are arranged in one direction, the slits 20 may be formed in the stretchable base material 12c in any way. For example, only one slit 20 may be formed in the width direction of the stretchable base material 12c and arranged in a line in the lengthwise direction of the stretchable base material 12c. Alternatively, two slits 20 may be formed in series in the width direction of the stretchable base material 12c and arranged in the lengthwise direction of the stretchable base material 12c to form a total of two rows. The two rows may be replaced by three or more rows.

The stretchable base material 12c is a base material having a plurality of slits 20, and is configured to be easily curved in a direction perpendicular to the length direction of the slits 20 on the surface of the stretchable base material 12c. Moreover, both surfaces of the sealing material 10 on the surface protection substrate 11 side and on the stretchable substrate 12c side are smooth surfaces. As shown in (5C), the stretchable base material 12c tends to bend following the deformation of the encapsulant 10 . The elastic base material 12c is not particularly limited as long as it is easier to expand and contract than a base material made of drawn polypropylene having the same area and the same thickness in a plan view. For example, OPP may be used, but polyethylene is preferable. is.

(Fifth embodiment)
Next, a sealing material with a surface protection base material according to a fifth embodiment will be described. In the fifth embodiment, overlapping descriptions of the parts common to the above-described embodiments are omitted.

FIG. 6 shows a perspective view of a sealing material with a surface protection substrate according to a fifth embodiment of the present invention and an enlarged view of a part D thereof.

The sealant 1d with a surface protection base material according to the fifth embodiment is a moisture-curing semi-solid sealant 10 and one of the sticking surfaces of both the sealant 10 and a peeling surface. A film-like surface protection substrate 12 (stretchable substrate 12) that can be provided is provided. As in the first embodiment, the stretchable base material 12 is a base material that is easier to stretch than a stretched polypropylene base material having the same area and the same thickness in a plan view. The sealant 1d with a surface protection substrate has a stretchable substrate 12 on only one sticking surface, and has a rolled shape with the stretchable substrate 12 facing outward. The application surface, which is not provided with the stretchable substrate 12, is in contact with the stretchable substrate 12 in this configuration, and therefore has a low risk of being exposed to moisture in the air.

The elastic base material 12 is preferably a base material made of polyethylene, and is highly elastic. Therefore, when using the sealing material 1d with the surface protection base material, the stretchable base material 12 is likely to deform following the bending deformation of the sealing material 10, as in the first embodiment. 10, it is difficult to generate a force in the direction of returning the sealing material 10 to the horizontal state. Therefore, the sealing material 10 is fixed along the curved surface C to be adhered in such a manner that no gap is formed or, even if a gap is formed, the gap remains small.

(Other embodiments)
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be implemented with various modifications.

For example, in each of the above-described embodiments, the sealants 1, 1a, 1b, 1c, and 1d with a surface protection substrate (referred to as “the sealant 1 with a surface protection substrate, etc.”) stretch and contract on both sides of their attachment surfaces. The elastic substrates 12, 12a, 12b, 12c (referred to as "elastic substrates 12 and the like") are not provided. However, both sticking surfaces may be provided with the stretchable base material 12 or the like. In that case, the same stretchable base material 12 or the like may be provided on both sticking surfaces, or different types of stretchable base material 12 or the like may be provided on both sticking surfaces.

The stretchable base materials 12a, 12b, and 12c in the second to fourth embodiments may be used instead of the stretchable base material 12 of the sealing material 1d with the surface protection base material according to the fifth embodiment. The constituent elements of each of the first to fifth embodiments can be arbitrarily combined except when they cannot be combined with each other.

The present invention can be used, for example, as a sealing material.

1, 1a, 1b, 1c, 1d... Sealing material with surface protection base material, 10... Sealing material, 10a... Sticking surface, 10b... Second unevenness, 11... Surface protection Base material 12, 12a, 12b, 12c... Stretchable base material (an example of surface protection base material) 15... Strip-shaped base material 16... First unevenness 20... Slit.

Claims (5)

a moisture curable semi-solid encapsulant;
a film-like surface protection substrate that is detachably provided on at least one of the two sticking surfaces of the sealing material;
with
At least one of the surface protection substrates provided on the attachment surface is a stretchable substrate made of polyethylene ,
Both sticking surfaces of the sealing material are provided with the surface protection base material,
Only one of the surface protection substrates is the stretchable substrate,
A sealing material with a surface protection substrate, wherein the other surface protection substrate is a substrate that is less stretchable than the stretchable substrate. The stretchable base material is a base material in which a plurality of strip-shaped base materials are arranged so as to partially overlap between adjacent base materials, and can be easily bent in the arrangement direction of the strip-shaped base materials. The encapsulant with a surface protection base material according to claim 1, comprising: 2. The sealing material with a surface protection substrate according to claim 1, wherein the stretchable substrate is a substrate having first bellows-shaped unevenness, and is configured to be easily curved in the arrangement direction of the first unevenness. . 4. The encapsulant with a surface protection substrate according to claim 3 , wherein said encapsulant comprises second unevenness that contacts said first unevenness of said stretchable substrate. The sealing material with a surface protection substrate according to claim 1, wherein the stretchable substrate has a plurality of slits arranged in parallel in one direction, and is configured to be easily curved in the direction in which the slits are arranged in parallel.

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