JP2016138237A - Polyol composition for pressure-sensitive adhesive, kit for pressure-sensitive adhesive, and laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyol composition for a pressure-sensitive adhesive, capable of improving wettability of a pressure-sensitive adhesive layer.SOLUTION: The polyol composition contains a polyol (A) and is reacted with a polyisocyanate compound (B) to obtain a pressure-sensitive adhesive. The polyol (A) contains a polyol (A1): a polyoxyalkylene polyol in which the number of functional groups is 3 or more, the number average molecular weight per functional group is 500-2,500, and the content of oxyethylene groups with respect to the total of oxyalkylene groups is 16 mol% or more.SELECTED DRAWING: None

Description

  The present invention relates to a polyol composition for pressure-sensitive adhesives, a kit for pressure-sensitive adhesives, and a laminate in which a pressure-sensitive adhesive layer is provided on a substrate.

  When manufacturing electrical parts, electronic materials, and the like, a surface protective film is attached to a portion that needs to be prevented from being scratched on the surface in processes such as storage and transportation. Such a surface protective film has releasability, and is easily peeled off from the optical member or the electronic member when the surface protection is no longer necessary.

When sticking a surface protection film, a bubble may be caught between a to-be-adhered surface and a surface protection film, and the countermeasure is required.
In Patent Document 1, in a surface protective film including a pressure-sensitive adhesive layer made of a polyurethane-based resin obtained by curing a composition containing a polyol and a polyisocyanate compound, 70 to 100% by mass of the polyol is used as an OH group. Is used to improve the wettability of the pressure-sensitive adhesive layer by using a polyol having a number average molecular weight Mn of 8000 to 20000, thereby preventing entrainment of bubbles during sticking.
The number average molecular weight of the polyol used in the Examples of Patent Document 1 is 10,000 or 15,000.

JP 2014-111701 A

However, the method described in Patent Document 1 is not necessarily sufficient, and it is required to further improve the wettability of the pressure-sensitive adhesive layer.
The present invention has been made in view of the above circumstances, and is capable of improving the wettability of the pressure-sensitive adhesive layer while ensuring the peelability, the pressure-sensitive adhesive polyol composition, the pressure-sensitive adhesive kit, and the pressure-sensitive adhesive on the substrate. Provided is a laminate provided with an agent layer.

[1] A polyol composition containing a polyol (A) and reacting with a polyisocyanate compound (B) to obtain a pressure-sensitive adhesive, wherein the polyol (A) contains the following polyol (A1) A polyol composition for pressure-sensitive adhesives.
Polyol (A1): A polyoxyalkylene polyol having 3 or more functional groups, a number average molecular weight of 500 to 2500 per functional group, and an oxyethylene group content of 16 mol% or more based on the total of oxyalkylene groups.
[2] The polyol composition for pressure-sensitive adhesives according to [1], containing 30 to 100% by mass of the polyol (A1) when the polyol (A) is 100% by mass.
[3] The polyol composition for pressure-sensitive adhesives according to [1] or [2], which contains a resin (E) having no functional group that reacts with an isocyanate group.
[4] The polyol composition for pressure-sensitive adhesives according to [3], containing 0.1 to 50 parts by weight of the resin (E) with respect to 100 parts by weight of the polyol composition for pressure-sensitive adhesives.

[5] The adhesive according to [1] or [2], having a main agent composition housed in a first container and a curing agent composition housed in a second container. A kit for pressure-sensitive adhesives, wherein the curing agent composition contains a polyisocyanate compound (B), and one or both of the main agent composition and the curing agent composition contains a catalyst (C). .
[6] The pressure-sensitive adhesive kit according to [5], wherein one or both of the main agent composition and the curing agent composition further contains a resin (E) having no functional group that reacts with an isocyanate group.
[7] The main agent composition contained in the first container and the curing agent composition contained in the second container, wherein the main agent composition is the polyol composition for pressure-sensitive adhesives according to [4]. Yes, the kit for pressure-sensitive adhesives, wherein the curing agent composition contains a polyisocyanate compound (B), and one or both of the main agent composition and the curing agent composition contains a catalyst (C).
[8] The pressure-sensitive adhesive kit according to any one of [5] to [7], wherein the polyisocyanate compound (B) contains a trifunctional polyisocyanate compound.

[9] A laminate having a base material and a pressure-sensitive adhesive layer provided on the base material, wherein the pressure-sensitive adhesive layer includes a polyol (A) containing the following polyol (A1), a polyisocyanate compound (B), And a laminate, which is a cured product of the pressure-sensitive adhesive composition containing the catalyst (C).
Polyol (A1): A polyoxyalkylene polyol having 3 or more functional groups, a number average molecular weight of 500 to 2500 per functional group, and an oxyethylene group content of 16 mol% or more based on the total of oxyalkylene groups.
[10] The laminate according to [9], wherein the pressure-sensitive adhesive composition contains the resin (E).
[11] The laminate according to [9] or [10], wherein the polyisocyanate compound (B) contains a trifunctional polyisocyanate compound.

According to the polyol composition for pressure-sensitive adhesives of the present invention, the wettability of the pressure-sensitive adhesive layer can be improved while ensuring the peelability.
According to the pressure-sensitive adhesive kit of the present invention, the wettability of the pressure-sensitive adhesive layer can be improved while ensuring the peelability.
According to the laminate in which the pressure-sensitive adhesive layer of the present invention is provided on the substrate, the wettability of the pressure-sensitive adhesive layer can be improved while ensuring the peelability.

It is a schematic diagram for demonstrating the measuring method of a wetting speed.

The number average molecular weight in this specification (hereinafter sometimes referred to as “Mn”) is a polystyrene-converted molecular weight obtained by measuring with gel permeation chromatography using a calibration curve prepared using a standard polystyrene sample with a known molecular weight. It is.
The number average molecular weight per functional group is a value obtained by dividing the number average molecular weight obtained above by the number of functional groups (hereinafter also referred to as “Mn / f”). The number of functional groups is also referred to as the number of functional groups (hereinafter sometimes referred to as “f”).
The functional group of the polyol (A) is a hydroxyl group. In the polyol (A), the number of functional groups represents the number of hydroxyl groups and is also referred to as the number of hydroxyl groups. In the polyol (A), the number of hydroxyl groups is equal to the number of active hydrogens of the initiator used when obtaining the polyoxyalkylene polyol.
The functional group of the polyisocyanate compound (B) is an isocyanate group.

<Polyol composition for pressure-sensitive adhesive>
The polyol composition for pressure-sensitive adhesives of the present invention (hereinafter sometimes referred to as “polyol composition”) is used for the purpose of obtaining a pressure-sensitive adhesive by reacting with the poisocyanate compound (B).
The polyol composition contains polyol (A). The polyol (A) is one kind of a polyol containing two or more hydroxyl groups in one molecule, or a mixture of two or more kinds.
In addition to the polyol (A), the polyol composition may contain a catalyst (C), a solvent (D), a resin (E), other components, and the like, which will be described later, within a range where the storage stability of the polyol composition can be obtained. . The polyol composition does not contain the polyisocyanate compound (B).
The content of the polyol (A) when the polyol composition is 100% by mass is preferably 20% by mass or more, more preferably 40% by mass or more, and particularly preferably 60% by mass or more. It may be 100% by mass.

[Polyol (A1)]
Polyol (A) contains polyol (A1).
The polyol (A1) has a functional group number (hereinafter also referred to as “the number of hydroxyl groups”) of 3 or more, a number average molecular weight per functional group of 500 to 2500, and an oxyethylene group content with respect to the total of oxyalkylene groups of 16 mol. % Of polyoxyalkylene polyol.
The polyol (A1) contained in the polyol (A) may be one kind, and the number of functional groups, the number average molecular weight per functional group, and the oxyethylene group content relative to the total of oxyalkylene groups as long as the above range is satisfied. Two or more different types may be included.

The upper limit of the number of hydroxyl groups in the polyol (A1) is preferably 8 or less, more preferably 6 or less, and even more preferably 4 or less from the viewpoint of wettability.
The higher the number of hydroxyl groups, the easier it is to obtain excellent high-speed peelability, and the lower the number, the higher the wetting rate.
When two or more polyols (A1) are used in combination, the average number of hydroxyl groups per molecule in the total of polyols (A1) is determined by the ratio of the polyol (A1) contained and the weighted average of the number of each hydroxyl group. be able to. Moreover, it can also calculate according to Formula (1) from the hydroxyl value of the polyol (A1) which mixed 2 or more types.
Number of hydroxyl groups per molecule = hydroxyl value × molecular weight / (56.1 × 1000) (1)
The average value of the number of hydroxyl groups per molecule in the total of polyol (A1) is preferably 3.0 to 8.0, more preferably 3.0 to 6.0, still more preferably 3.0 to 4.0, 3.0 to 3.8 is particularly preferable.
The polyol (A1) preferably contains at least a polyoxyalkylene polyol having 3 or 4 hydroxyl groups.
The polyol (A1) preferably contains a polyoxyalkylene polyol having 4 hydroxyl groups from the viewpoint of obtaining excellent high-speed peelability. For example, the polyoxyalkylene polyol having 4 hydroxyl groups with respect to the total of the polyol (A1) is preferably 15% by mass or more, more preferably 30% by mass or more, further preferably 50% by mass or more, and even 100% by mass. Good.

The polyol (A1) is preferably a polyoxyalkylene polyol obtained by ring-opening addition of one or more alkylene oxides to an initiator having three or more active hydrogens. The number of active hydrogens in the initiator is equal to the number of hydroxyl groups in the polyoxyalkylene polyol obtained using the initiator.
The alkylene oxide has preferably 2 to 4 carbon atoms, more preferably 2 (ethylene oxide) or 3 (propylene oxide). When ring-opening addition of two or more alkylene oxides to the initiator, the sequence of the oxyalkylene group derived from each alkylene oxide may be random or block.
It is preferable that the oxyalkylene group in the polyol (A1) consists of only an oxyethylene group or an oxyethylene group and an oxypropylene group.
In the polyol (A1), the content of oxyethylene groups relative to the total of oxyalkylene groups (hereinafter also referred to as “EO content”) is 16 mol% or more. When the EO content is 16 mol% or more, the wetting rate in the pressure-sensitive adhesive layer can be sufficiently improved. The EO content is preferably 20 mol% or more, and more preferably 30 mol% or more. The upper limit may be 100 mol%. 90 mol% or less is preferable from the point of the heat-and-moisture resistance of an adhesive layer, and 85 mol% or less is more preferable.
The EO content can be measured using NMR. For example, in the case of a polyol composed of propylene oxide and ethylene oxide, the EO content can be determined from the area ratio of the signal of the methyl group of the oxypropylene group to the signal of the oxypropylene group and the methylene group of the oxyethylene group.

  The number average molecular weight per functional group of the polyol (A1) is 500 to 2500, preferably 800 to 2350, and more preferably 1200 to 2350. When the number average molecular weight per functional group of the polyol (A1) is not less than the lower limit of the above range, the wetting rate can be sufficiently improved, and when it is not more than the upper limit, sufficient peelability can be maintained.

  30-100 mass% is preferable, as for the content rate of a polyol (A1) when a polyol (A) is 100 mass%, 50-100 mass% is more preferable, and 70-100 mass% is especially preferable. When the content ratio of the polyol (A1) in the polyol (A) is within the above range, wettability can be improved while ensuring releasability.

Moreover, as shown in the below-mentioned Example, high-speed peelability can be improved more by using together polyol (A1) with little EO content, and polyol (A1) with much EO content. It is considered that high-speed peelability is improved by adjusting the glass transition temperature so that the mobility of the molecular chain of the polyol (A1) is increased by the EO content.
For example, when two or more polyols (A1) having different EO contents are used in combination, the polyol having the smallest EO content (hereinafter also referred to as “polyol (A1a)”) has an EO content of 16 to 60 mol. The polyol having the highest EO content (hereinafter also referred to as “polyol (A1b)”) has an EO content of 60 to 100 mol%, and the difference in EO content between the two is 30 mol% or more. It is preferable that there is good peelability.
The total of the polyol (A1a) and the polyol (A1b) is preferably 30 to 100% by mass and more preferably 50 to 100% by mass with respect to the total of the polyol (A1). Further, the mass ratio of polyol (A1a) / polyol (A1b) is preferably 20/80 to 80/20, and more preferably 30/70 to 70/30 because the peelability is improved.
The number of functional groups of two or more polyols (A1) having different EO contents may be the same or different. When the number of functional groups of polyol (A1a) and polyol (A1b) is different, polyol (A1a) has a larger number of functional groups, and the difference is preferably 1.0 to 3.0, and 1.0 to 2.0 is peeled off. It is more preferable because the property is improved.
The number average molecular weights per functional group of two or more polyols (A1) having different EO contents may be the same or different. When the number average molecular weight per functional group is different between the polyol (A1a) and the polyol (A1b), the polyol (A1a) has a larger number average molecular weight per functional group, and the difference is 100 to 2000. Preferably, 200-1500 is more preferable from the viewpoint of good peelability.

[Polyol (A2)]
The polyol (A) may be a polyoxyalkylene polyol having 3 or more hydroxyl groups, and may include a polyol (A2) having a number average molecular weight of more than 2500 per functional group. The content of the polyol (A2) when the polyol (A) is 100% by mass is preferably 30% by mass or less, preferably 10% by mass or less, with respect to the polyol (A) in terms of high-speed peelability. More preferred is 5% by mass or less, and especially preferred is zero.

[Polyol (A3)]
The polyol (A) may include a polyoxyalkylene polyol (A3) having 2 hydroxyl groups. The polyol (A3) contained in the polyol (A) may be one type or two or more types.
The number average molecular weight per functional group of the polyol (A3) is preferably 200 to 9000, more preferably 250 to 5000, and still more preferably 300 to 2500. If the number average molecular weight per functional group of the polyol (A3) is not less than the lower limit of the above range, the wetting rate can be sufficiently improved, and if it is not more than the upper limit, sufficient peelability can be maintained.

The polyol (A3) is preferably a polyoxyalkylene polyol obtained by ring-opening addition of one or more alkylene oxides to an initiator having two active hydrogens. The alkylene oxide preferably has 2 to 4 carbon atoms, more preferably 2 or 3. When ring-opening addition of two or more alkylene oxides to the initiator, the sequence of the oxyalkylene group derived from each alkylene oxide may be random or block.
It is preferable that the oxyalkylene group in the polyol (A3) consists of only an oxyethylene group or an oxyethylene group and an oxypropylene group.
In the polyol (A3), the content of oxyethylene groups (EO content) relative to the total of oxyalkylene groups is preferably 5 to 100 mol%, more preferably 10 to 90 mol%, and even more preferably 15 to 85 mol%. When the EO content is not less than the lower limit of the above range, the wetting rate can be sufficiently improved, and when it is not more than the upper limit, the wet heat resistance of the pressure-sensitive adhesive layer is improved.

In the present invention, the polyol (A3) is not essential, but if the polyol (A) contains the polyol (A3), the adhesive force can be adjusted while maintaining sufficient wettability.
When the polyol (A3) is used, the content of the polyol (A3) when the polyol (A) is 100% by mass is 5% by mass or more from the viewpoint that the effect of adding the polyol (A3) is easily obtained. Preferably, 10 mass% or more is more preferable, and 15 mass% or more is particularly preferable. The upper limit of the content of the polyol (A3) is preferably 70% by mass or less, more preferably 60% by mass or less, and particularly preferably 50% by mass or less in terms of maintaining wettability.

Moreover, as shown in the below-mentioned Example, high-speed peelability can be improved more by using together the polyol (A1) and polyol (A3) from which EO content mutually differs. It is considered that high-speed peelability is improved by adjusting the glass transition temperature so that the mobility of the molecular chain of the polyol (A1) is increased by the EO content.
For example, when one or more polyols (A1) having different EO contents and one or more polyols (A3) are used in combination, the polyol having the smallest EO content is polyol (A1) (hereinafter, “polyol (A1c)”. The polyol having the highest EO content is preferably polyol (A3) (hereinafter also referred to as “polyol (A3d)”).
Alternatively, the polyol having the lowest EO content is polyol (A3) (hereinafter also referred to as “polyol (A3e)”), and the polyol having the highest EO content is polyol (A1) (hereinafter “polyol (A1f)”). May also be referred to.).
The EO content of the polyol (A1c) or (A3e) is 16 to 50 mol%, the EO content of the polyol (A3d) or (A1f) is 60 to 100 mol%, and the difference in the EO content between the two is It is preferable that it is 30 mol% or more.
50-100 mass% is preferable with respect to the sum total of a polyol (A1) and (A3), and the sum total of a polyol (A1c) and a polyol (A3d) or (A3e) and (A1f) is 75-100 mass%. Is more preferable. The mass ratio of polyol (A1c) / polyol (A3d) or mass ratio of (A3e) / (A1f) is preferably 20/80 to 80/20, and more preferably 30/70 to 70/30.
The number average molecular weights per functional group of the polyol (A1) and the polyol (A3) having different EO contents may be the same or different.

[Polyol (A4)]
The polyol (A) may contain a polyol (A4) that is not included in any of the polyol (A1), polyol (A2), or polyol (A3).
As the polyol contained in the polyol (A4), those having 2 to 6 hydroxyl groups are preferable. For example, the number of hydroxyl groups is 3 or more, the molecular weight per functional group is 500 to 2500, and oxyethylene relative to the total of oxyalkylene groups. Examples include polyoxyalkylene polyols having a group content of less than 16 mol%, polyester polyols having 2 to 6 hydroxyl groups, polyester ether polyols having 2 to 6 hydroxyl groups, and polycarbonate polyols having 2 to 6 hydroxyl groups. .
400-15000 are preferable, as for the number average molecular weight per functional group of a polyol (A4), 2000-13000 are more preferable, 4000-11000 are further more preferable, and 5500-10000 are especially preferable.
The polyol (A4) contained in the polyol (A) may be one type or two or more types.
The average number of hydroxyl groups per molecule of the polyol (A4) is preferably 2.0 to 6.0.

  In the present invention, the polyol (A4) is not essential, but if the polyol (A) contains the polyol (A4), the wettability can be further improved. In the case of using the polyol (A4), the content of the polyol (A4) with respect to the polyol (A) is preferably 5% by mass or more from the viewpoint that the effect of adding the polyol (A4) is easily obtained, and preferably 10% by mass or more. Particularly preferred. The upper limit of the content of the polyol (A4) is preferably 70% by mass or less, more preferably 50% by mass or less, and particularly preferably 30% by mass or less from the viewpoint of maintaining peelability.

<Polyisocyanate compound (B)>
A pressure-sensitive adhesive is obtained by reacting the polyol (A) with the polyisocyanate compound (B) as a curing agent in the presence of the catalyst (C), and a pressure-sensitive adhesive layer is formed on the substrate. Can do.
Specifically, a pressure-sensitive adhesive is obtained by preparing a pressure-sensitive adhesive composition containing a polyol (A), a polyisocyanate compound (B), and a catalyst (C) and curing the pressure-sensitive adhesive composition.

The polyisocyanate compound (B) is a compound having two or more isocyanate groups (hereinafter also referred to as functional groups). The number of functional groups of the polyisocyanate compound (B) is preferably 2 or 3.
In the present invention, the polyisocyanate compound (B) may be used alone or in combination of two or more.
As the polyisocyanate compound (B), a known polyisocyanate compound that can be used in the urethanization reaction can be used. For example, an aliphatic polyisocyanate compound, an alicyclic polyisocyanate, an aromatic polyisocyanate compound, and the like can be given.

  Examples of the aliphatic polyisocyanate compound include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, 2,4,4. -Trimethylhexamethylene diisocyanate or modified products thereof.

  Examples of the alicyclic polyisocyanate compound include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, and hydrogen. Examples include added tolylene diisocyanate, hydrogenated tetramethylxylylene diisocyanate, and modified products thereof.

Examples of the aromatic polydiisocyanate compound include phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,2′-didiphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, 4, Examples include 4'-toluidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, xylylene diisocyanate, or modified products thereof.
Examples of modified polyisocyanate compounds include adduct-type modified products obtained by reaction with trimethylolpropane, burette-type modified products obtained by reaction with water, and isocyanurate-type modified products obtained by cyclization trimerization reaction. (Trimer having an isocyanurate ring) and the like.
In particular, aliphatic or alicyclic isocyanates are more preferable in that a pressure-sensitive adhesive layer having a low viscosity in the cured pressure-sensitive adhesive layer and excellent in high-speed peelability can be easily obtained.

It is preferable that the polyisocyanate compound (B) contains a trifunctional polyisocyanate compound in that a pressure-sensitive adhesive layer having low viscosity and excellent high-speed peelability can be easily obtained.
The trifunctional polyisocyanate compound is preferably a trimethylolpropane adduct type modified product, an isocyanurate type modified product, or a biuret type modified product of the above polyisocyanate compound.
A preferable example of the trimethylolpropane adduct type modified product is Coronate L (manufactured by Tosoh Corporation).
A preferable example of the isocyanurate-type modified product is Coronate HX (manufactured by Tosoh Corporation).
A preferred example of the biuret-type modified product is Duranate 24A-100 (manufactured by Asahi Kasei Corporation).
It is preferable that a trifunctional polyisocyanate compound is 30-100 mass% with respect to a polyisocyanate compound (B), 50-100 mass% is more preferable, and 70-100 mass% is especially preferable.

The amount of the polyisocyanate compound (B) used is preferably a stoichiometric excess of isocyanate groups in the reaction of the polyol (A) and the polyisocyanate compound (B).
Specifically, an index that is a value obtained by multiplying the ratio obtained by dividing the number of equivalents of isocyanate groups by the number of equivalents of hydroxyl groups by 100 is preferably 100 to 400, more preferably 110 to 300, and 110 -195 is more preferred.
If the index is not less than the lower limit of the above range, sufficient wettability can be secured, and if it is not more than the upper limit, foaming during pressure-sensitive adhesive molding is easily suppressed.

<Catalyst (C)>
When the pressure-sensitive adhesive is obtained by reacting the polyol (A) with the polyisocyanate compound (B), the catalyst (C) is used. As the catalyst (C), a known urethanization catalyst can be used. For example, an organometallic compound, a tertiary amine compound, etc. are mentioned.
Examples of organometallic compounds include iron compounds, tin compounds, titanium compounds, zirconium compounds, lead compounds, cobalt compounds, zinc compounds, and the like.
Examples of the tertiary amine compound include triethylamine, triethylenediamine, N, N-dimethylbenzylamine, N-methylmorpholine, 1,8-diazabicyclo [5.4.0] undecene-7, and the like.

Examples of iron-based compounds include iron acetylacetonate and iron 2-ethylhexanoate.
Examples of tin compounds include dibutyltin dichloride, dibutyltin oxide, dibutyltin dibromide, dibutyltin maleate, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin sulfide, tributyltin methoxide, tributyltin acetate, triethyltin ethoxide, Examples include tributyltin ethoxide, dioctyltin oxide, dioctyltin dilaurate, tributyltin chloride, tributyltin trichloroacetate, and tin 2-ethylhexanoate.
Examples of titanium compounds include dibutyltitanium dichloride, tetrabutyltitanate, butoxytitanium trichloride, and the like.
Examples of the zirconium-based compound include zirconium naphthenate and zirconium acetylacetonate.
Examples of the lead-based compound include lead oleate, lead 2-ethylhexanoate, lead benzoate, lead naphthenate, and the like.
Examples of the cobalt-based compound include cobalt 2-ethylhexanoate and cobalt benzoate.
Examples of the zinc-based compound include zinc naphthenate and zinc 2-ethylhexanoate.

Only 1 type may be used for a catalyst (C) and it may use 2 or more types together.
0.002-0.80 mass part is preferable with respect to 100 mass parts of polyol (A), and, as for the usage-amount of a catalyst (C), 0.004-0.4 mass part is more preferable, and 0.008- 0.1 parts by mass is particularly preferable.

<Solvent (D)>
When the pressure-sensitive adhesive is obtained by reacting the polyol (A) with the polyisocyanate compound (B), a solvent (D) may be used.
As the solvent (D), known solvents that can be used in the urethanization reaction system can be appropriately used. For example, ethyl acetate, butyl acetate, toluene, methyl ethyl ketone and the like can be mentioned.
If the amount of the solvent (D) used is too large, the viscosity will be too low, and if it is too small, the viscosity will increase rapidly. For example, 50-400 mass parts is preferable with respect to 100 mass parts of polyol (A), 100-300 mass parts is more preferable, and 150-250 mass parts is especially preferable.

<Resin (E)>
When the pressure-sensitive adhesive is obtained by reacting the polyol (A) with the polyisocyanate compound (B), a resin (E) other than the polyisocyanate compound (B) and having no functional group that reacts with the isocyanate group is included. But you can. The functional group that reacts with an isocyanate group refers to a group having active hydrogen such as a hydroxyl group, a carboxy group, a primary amide group, a secondary amide group, a hydrazide group, or a mercapto group. Examples of the resin (E) include terminal-modified polyoxyalkylene polyol compounds, fatty acid ester compounds, phosphate ester compounds, polyacrylic resins, polyester resins, and epoxy resins.

Examples of the terminal-modified polyoxyalkylene polyol compound include alkoxy-modified polyoxyalkylene polyol, ester-modified polyoxyalkylene polyol, and silane-modified polyoxyalkylene polyol.
Examples of the alkoxy-modified polyoxyalkylene polyol include methoxy-modified polyoxyalkylene polyol, ethoxy-modified polyoxyalkylene polyol, propyloxy-modified polyoxyalkylene polyol, and butoxy-modified polyoxyalkylene polyol.
Examples of the ester-modified polyoxyalkylene polyol include acrylic acid ester-modified polyoxyalkylene polyol, maleate ester-modified polyoxyalkylene polyol, and phthalate ester-modified polyoxyalkylene polyol.
Examples of the silane-modified polyoxyalkylene polyol include alkoxysilane-modified polyoxyalkylene polyol and alkylsilane-modified polyoxyalkylene polyol.
The average molecular weight of the terminally modified polyoxyalkylene polyol-based compound is preferably from 100 to 50,000, particularly preferably from 200 to 30,000. From the viewpoint of improving wettability, 250 to 25000 is particularly preferable.
The oxyethylene group content (EO content) relative to the total number of polyoxyalkylene groups in the terminal-modified polyoxyalkylene polyol-based compound is preferably 3% or more and particularly preferably 5% or more because wettability is improved. From the viewpoint of heat and humidity resistance of the pressure-sensitive adhesive layer, 70% or less is preferable, and 50% or less is particularly preferable.

Examples of fatty acid ester compounds include cetyl 2-ethylhexanoate, triglyceride 2-ethylhexanoate, methyl laurate, butyl laurate, polyoxyethylene bisphenol A laurate, isopropyl myristate, myristyl myristate, octyldodecyl myristate , Isopropyl palmitate, 2-ethylhexyl palmitate, methyl stearate, butyl stearate, 2-ethylhexyl stearate, isotridecyl stearate, stearyl stearate, cholesteryl isostearate, methyl oleate, octyl oleate, monoglyceride behenate , Palm fatty acid methyl, lauryl methacrylate, pentaerythritol monooleate, pentaerythritol monostearate, penta Risuri toll-tetra-palmitate, and the like.
Examples of phosphate ester compounds include dilauryl hydrogen phosphite, dioleyl hydrogen phosphite, triisooctyl phosphite, and phenyl diisodecyl phosphite.

As the resin (E), terminal-modified polyoxyalkylene polyol compounds and fatty acid esters are preferable from the viewpoint of improving the wettability of the pressure-sensitive adhesive layer, and in particular, alkoxy-modified polyoxyalkylene polyols and ester-modified polyoxyalkylenes. One or more selected from the group consisting of alkylene polyols, silane-modified polyoxyalkylene polyols and fatty acid esters are preferred. Specifically, terminal methoxy-modified polyoxyalkylene polyol and isopropyl palmitate are preferred.
When adding resin (E), 0.1-50 mass parts is preferable with respect to 100 mass parts of polyol (A), and 0.1-40 mass parts is especially preferable. By using the resin (E) within the above range, the wettability to glass is improved, and the substrate surface such as glass is not only a smooth substrate, but also the substrate surface such as a polarizing plate has irregularities. Good wettability of the pressure-sensitive adhesive layer can also be realized with respect to the substrate, and good releasability can be ensured. When resin (E) exceeds the said range, the problem that peelability cannot be secured will arise, or the problem that a to-be-adhered body will be contaminated will arise.

<Other ingredients>
When the pressure-sensitive adhesive is obtained by reacting the polyol (A) with the polyisocyanate compound (B), any of the polyol (A), the polyisocyanate compound (B), the catalyst (C), the solvent (D), or the resin (E) You may use the other component which does not correspond also in the range which does not impair the effect of this invention.
Examples of other components include antioxidants, plasticizers, light stabilizers, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, foils, softeners, anti-aging agents, conductive agents, Examples include ultraviolet absorbers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, and lubricants.
For example, examples of the antioxidant include hindered phenol, phosphorus, and sulfur compounds.
As addition amount of antioxidant, 0.05-5 mass parts is preferable with respect to a total of 100 mass parts of a polyol (A) and a polyisocyanate compound (B), and 0.1-2 mass parts or less are more preferable.

<Adhesive kit>
Since the reaction between the polyol (A) and the polyisocyanate compound (B) proceeds even at room temperature in the presence of the catalyst (C), the pressure-sensitive adhesive containing the polyol (A), the polyisocyanate compound (B), and the catalyst (C) The composition is preferably prepared immediately before use.
Industrially, the main component composition containing the polyol (A) and the curing agent composition containing the polyisocyanate compound (B) are stored separately and mixed immediately before use to prepare an adhesive composition. It is preferable to do.
The polyol composition for pressure-sensitive adhesives of the present invention can be used as a main agent composition containing a polyol (A).

The pressure-sensitive adhesive kit of the present invention has a main agent composition housed in a first container and a curing agent composition housed in a second container, and the main agent composition is for the pressure-sensitive adhesive of the present invention. It is a polyol composition, and the curing agent composition contains a polyisocyanate compound (B).
The catalyst (C) may be contained in either the main agent composition or the curing agent composition, or may be contained in both. From the viewpoint of storage stability, it is preferable to contain the catalyst (C) only in the main agent composition.
You may make a solvent (D) contain in either one or both of a main ingredient composition and a hardening | curing agent composition.
The resin (E) may be contained in either the main agent composition or the curing agent composition, or may be contained in both. From the viewpoint of compatibility, it is preferable to contain the resin (E) in the main composition.
In addition to the catalyst (C) or the solvent (D), the curing agent composition may contain other components that do not react with the polyisocyanate compound (B). Other components include, for example, antioxidants, plasticizers, light stabilizers, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, foils, softeners, anti-aging agents, conductive agents, ultraviolet rays Examples include absorbents, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, and lubricants.
The content of the polyol (A) based on 100% by mass of the main agent composition is preferably 20% by mass or more, more preferably 30% by mass or more, and particularly preferably 40% by mass or more. It may be 100% by mass.
The content of the polyisocyanate compound (B) when the curing agent composition is 100% by mass is preferably 85% by mass or more, more preferably 90% by mass or more, and particularly preferably 95% by mass or more. It may be 100% by mass.

<Laminate>
The laminate of the present invention is a laminate (for example, an adhesive film) having a base material and an adhesive layer provided on the base material. Furthermore, the laminated body (for example, adhesive film with a separator) by which the separator was laminated | stacked on this adhesive layer may be sufficient.
The pressure-sensitive adhesive layer is a cured product of a pressure-sensitive adhesive composition containing a polyol (A), a polyisocyanate compound (B), and a catalyst (C).

<Base material>
The material of the substrate is not particularly limited, and a known material can be used as appropriate. For example, a plastic, paper, a metal film, a nonwoven fabric, etc. are mentioned. Preferably, it is a plastic. The base material may be comprised from 1 type of material, and may be comprised from 2 or more types of materials. For example, two types of plastic layers may be laminated.
The thickness of the substrate is not particularly limited depending on the application. For example, it is 5 μm to 300 μm, preferably 10 μm to 250 μm, more preferably 15 μm to 200 μm, and particularly preferably 20 μm to 150 μm.
Surface treatment for improving adhesive force such as corona discharge treatment and primer treatment may be performed on the surface on which the pressure-sensitive adhesive layer is provided.
Moreover, a well-known mold release process may be performed with respect to the surface of a base material in which the adhesive layer is not provided. Alternatively, a coating layer made of a known release agent may be provided.

<Adhesive layer>
The thickness of the pressure-sensitive adhesive layer can be appropriately set depending on the application. For example, 1 μm to 100 μm is preferable, more preferably 3 μm to 50 μm, and still more preferably 5 μm to 30 μm.
<Separator>
Examples of the separator include polyolefin films such as polyethylene and polypropylene, paper laminate films thereof, and separators having a release layer containing silicone.

<Method for producing laminate>
As a method for producing the laminate of the present invention, for example, a method of directly applying and drying the pressure-sensitive adhesive composition on one side or both sides of the substrate, a method of applying the pressure-sensitive adhesive composition to one side of the separator, and drying And forming a pressure-sensitive adhesive layer and bonding the pressure-sensitive adhesive layer to one side or both sides of the substrate. The latter method is preferable from the viewpoint of workability.
Examples of the coating method of the pressure-sensitive adhesive composition include bar coating, die coating, gravure coating, roll coating, spray coating, dip coating, and coating with an applicator. Further, extrusion coating with a die coater or the like may be used.
As a drying method, heat drying is preferable. Specific examples include a method of drying with hot air and a method of drying by infrared irradiation.
<Application>
The laminate of the present invention can be used, for example, as a surface protective film, a masking tape, or the like that temporarily covers and protects an exposed surface of an electronic component such as a display, a polarizing plate, an electronic substrate, and an IC chip.

According to the present invention, a polyoxyalkylene polyol (A1) having 3 or more hydroxyl groups reacts with the polyisocyanate compound (B) to form a crosslinked structure and cure to obtain an adhesive. An adhesive layer can be formed thereon.
As shown in the examples described later, by increasing the content ratio of the oxyethylene group in the polyoxyalkylene polyol (A1), the wetting rate of the pressure-sensitive adhesive layer with respect to the glass substrate can be improved. Can be improved. The reason is considered to be related to the fact that the glass transition temperature of the polyoxyalkylene polyol (A1) decreases as the content ratio of the oxyethylene group increases. That is, as the content ratio of the oxyethylene group is larger, the molecular chain of the polyoxyalkylene polyol (A1) in the pressure-sensitive adhesive layer after curing becomes easier to move, such as electronic parts such as a display, a polarizing plate, an electronic substrate, and an IC chip. It is considered that the wettability when the pressure-sensitive adhesive layer is bonded to a member requiring surface protection is improved.
As the wetting speed of the pressure-sensitive adhesive layer increases, bubbles are less likely to be involved when the pressure-sensitive adhesive layer is bonded to a member that requires surface protection such as an electronic component such as a display, a polarizing plate, an electronic substrate, or an IC chip.

Moreover, the adhesive film for surface protection is peeled and removed after the role of surface protection or the like is completed. Generally, the tensile force (peeling strength) necessary for peeling an adhesive film tends to increase as the tensile speed (peeling speed) increases.
For example, it is preferable that an adhesive film for protecting a surface of an electronic component such as a display, a polarizing plate, an electronic substrate, and an IC chip can be peeled smoothly at high speed. That is, it is preferable that the peel strength (high-speed peelability) when peeling at high speed is small in addition to the low peel strength (low-speed peelability) when peeling at low speed.
In the present invention, the high-speed peelability of the pressure-sensitive adhesive layer formed by the reaction between the polyoxyalkylene polyol (A1) having 3 or more hydroxyl groups and the polyisocyanate compound (B) reduces the viscosity of the pressure-sensitive adhesive layer. Can be improved.
Moreover, by using a trifunctional polyisocyanate compound as the polyisocyanate compound (B), the crosslink density can be increased and the viscosity of the pressure-sensitive adhesive layer can be decreased. Furthermore, the viscosity of the pressure-sensitive adhesive layer can be reduced by using a trifunctional polyisocyanate compound having a structure that easily forms a rigid molecular structure. For example, isocyanurate-type modified products or biuret-type modified products are considered to contribute to the formation of rigid molecular structures.

Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to these examples.
Evaluation was performed by the following method.

<Measurement of molecular weight>
[GPC measurement conditions]
Model used: HLC-8220GPC (manufactured by Tosoh Corporation).
Data processing device: SC-8020 (manufactured by Tosoh Corporation).
Columns used: Two TSG gel SuperMultipore HZ 4000 (manufactured by Tosoh Corporation) and two TSG gel SuperMultipore HZ 2500 (manufactured by Tosoh Corporation) were connected and used.
Column temperature: 40 ° C.
Detector: RI.
Solvent: Tetrohydrofuran.
Flow rate 0.35 mL / min.
Sample concentration: 0.5% by mass.
Injection volume: 20 μL.
Standard sample for preparing a calibration curve: polystyrene ([Easical] PS-2 [Polystyrene Standards], manufactured by Polymer Laboratories).

<Evaluation method of wetting speed (glass)>
The adhesive film was cut into a width of 40 mm and a length of 90 mm to obtain a test piece 1. As shown in FIG. 1, one end 1a in the length direction of the test piece 1 was fixed to the upper surface of the glass plate 2, and the other end 1b was grasped by hand and lifted. In the length direction of the test piece 1, the length of the contact portion between the glass plate 2 and the test piece 1 was 5 mm, and the angle formed between the upper surface of the glass plate 2 and the test piece 1 was 30 degrees. When the hand is released from the test piece 1, wetting (adherence part) between the test piece 1 and the glass plate 2 spreads from one end 1 a to the other end 1 b. A time T [unit: second] from when the hand is released from the test piece 1 until the wetting (adhered portion) reaches the other end 1b is measured, and the wetting speed (unit: mm) is calculated by the following equation (2). / Sec) was calculated. If the wetting speed is 35 mm / second or more, the wettability of the pressure-sensitive adhesive layer is good, and bubbles are not easily involved when blended into a substrate. The larger the wetting rate value, the better the wettability.
Wetting speed [mm / sec] = 85 [mm] / T [sec] (2)

<Evaluation method of wetting speed (polarizing plate)>
The wetting rate (polarizing plate) (unit: mm / second) was calculated in the same manner as the evaluation method except that a polarizing plate (manufactured by Polatechno) was attached to the upper surface of the glass plate 2 shown in FIG. The larger the wetting rate value, the better the wettability, and the less likely it is to entrain bubbles when blended into the substrate. In the test, those that did not spread at all were listed in Tables 1 and 2 as “not wet”.
As the polarizing plate, polarizing plate A (arithmetic average roughness Ra: 0.09 μm) and polarizing plate B (arithmetic average roughness Ra: 0.18 μm) having different surface roughnesses were used. The surface roughness was measured using a surface roughness measuring machine (Surfcoder SE3500 manufactured by Kosaka Laboratory). According to JIS B 0601 using the measured results, the roughness curve is folded back from the center line, and the area obtained by the roughness curve and the center line is divided by the reference length to obtain “arithmetic average roughness Ra (unit: μm) ”was calculated. It shows that the surface is so rough that the numerical value of arithmetic mean roughness Ra is large. When the glass is measured by the same method, the arithmetic average roughness Ra is 0.001 μm.

<Evaluation method of low-speed peelability>
The upper surface of a bright annealed stainless steel plate (SUS304, manufactured by Nippon Tact Co., Ltd.) (hereinafter also referred to as a SUS plate) was washed with methyl ethyl ketone and dried. An adhesive film was attached to the upper surface of the SUS plate at room temperature and pressure-bonded with a 2 kg rubber roll. After curing at room temperature for 24 hours, using a Tensilon tester (Orientec Co., Ltd., product name: RTG-1310), the adhesive film was peeled off under the conditions of 180 degree peel and a pulling speed of 300 mm / min (that is, 0.3 m / min). After peeling, the peel strength (adhesive strength) was measured. If the peel strength (adhesive strength) is 0.1 N / 25 mm or less, good peelability is exhibited. It shows that low-speed peelability is so favorable that this peel strength (adhesive force) is small.

<Evaluation method of high speed peelability>
The adhesive film was pressure-bonded to the upper surface of the SUS plate in the same manner as the evaluation method for the low-speed peelability. After curing at room temperature for 24 hours, using a high-speed peel tester (Tester Sangyo Co., Ltd., product name: TE-701 type), peel off the adhesive film under conditions of 180 degree peel and a tensile speed of 30000 mm / min, and measure the peel strength. did. The peel strength value indicates the adhesive strength, and if the peel strength is 2.3 N / 25 mm or less, good peelability is exhibited. It shows that high-speed peelability is so favorable that peeling strength is small.

Each component used in the following examples and comparative examples is as follows.
<Polyoxyalkylene polyol>
The polyoxyalkylene polyol used in each example is shown as (1) to (11) in the columns “A1” to “A4” in Tables 1 and 2.
Tables 1 and 2 describe the number of hydroxyl groups (f), the average molecular weight per functional group (Mn / f), and the PO / EO molar ratio for (1) to (11). The average molecular weight is a value obtained by dividing the number average molecular weight by the number of hydroxyl groups.

<Polyisocyanate compound (B)>
The polyisocyanate compound used in each example is shown as (21) to (24) in the “B” column of Tables 1 and 2. (21) to (24) are as follows.
(21): Coronate HX (product name), manufactured by Tosoh Corporation, an isocyanurate type modified product of hexamethylene diisocyanate (HDI) which is an aliphatic polyisocyanate compound, the number of functional groups is 3, the isocyanate group content is 21.0%, solid Partial concentration: 100% by mass.
(22): Coronate L (product name), manufactured by Tosoh Corporation, a trimethylolpropane adduct type modified product of tolylene diisocyanate, which is an alicyclic polyisocyanate compound, the number of functional groups is 3, the isocyanate group content is 13.5% by mass, Solid content concentration: 75 mass%.
(23): Duranate 24A-100 (product name), manufactured by Asahi Kasei Chemicals Co., Ltd., a biuret-type modified product of hexamethylene diisocyanate (HDI) which is an aliphatic polyisocyanate compound, the number of functional groups is 3, and the isocyanate group content is 23.5%. Solid content concentration: 100% by mass.
(24): Duranate D201 (product name), manufactured by Asahi Kasei Chemicals Corporation, hexamethylene diisocyanate (HDI), an aliphatic polyisocyanate compound, a bifunctional prepolymer type polyisocyanate resin, having 2 functional groups and containing isocyanate groups Amount 15.8%, solid content concentration: 100% by mass.

<Catalyst (C)>
The catalyst used in each example is shown as (31) to (33) in the “C” column of Tables 1 and 2. (31) to (33) are as follows.
(31): Neostan U-100 (product name), manufactured by Nitto Kasei Co., Ltd., dibutyltin dilaurate.
(32): Nursem ferric iron (product name), manufactured by Nippon Chemical Industry Co., Ltd., iron acetylacetonate.
(33): Nursem titanium (product name), manufactured by Nippon Kagaku Sangyo Co., Ltd., acetylacetone solution of titanium di-n-butoxide (bis-2,4-pentandionate), solid content concentration 72% by mass.
<Solvent (D)>
Ethyl acetate was used as the solvent.
<Resin (E)>
The resin (E) used in each example is shown as (41) to (43) in the “E” column of Tables 1 and 2. (41) to (43) are as follows.
(41): Terminal methoxy-modified polyoxyalkylene polyol. Number average molecular weight 1200. A terminal methoxy-modified polyoxyalkylene polyol having a PO / EO molar ratio of 87.2 / 12.8 and an EO content of 12.8 mol%.
(42): Isopropyl palmitate.
(43): Blemmer PDE600 (product name) manufactured by NOF Corporation, acrylic ester-modified polyoxyalkylene polyol, molecular weight of about 786.
<Antioxidant>
As the antioxidant, Irganox 1010 (product name, manufactured by BASF, hindered phenol-based antioxidant, [3- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propanoyloxy]- 2,2-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propanoyloxymethyl] propyl] 3- (3,5-di-tert-butyl-4-hydroxyphenyl) Propanoate) was used.
<Base material>
As the base material, a corona discharge-treated PET (polyethylene terephthalate) base material (thickness 38 μm, manufactured by Toyo Packaging Co., Ltd.) was used.
<Separator>
As the separator, a PET substrate having a thickness of 38 μm and having a silicone treatment on one side was used.

[Example 1]
100 parts by weight of polyol (1) as polyol (A), 12.6 parts by weight of polyisocyanate compound (21) as polyisocyanate compound (B), 0.04 parts by weight of catalyst (31) as catalyst (C), 210 parts by mass of ethyl acetate and 0.4 parts by mass of antioxidant were blended and stirred to obtain an adhesive composition.
The obtained pressure-sensitive adhesive composition was applied to the corona discharge-treated surface of the substrate so that the thickness after drying was 24 μm, and cured under conditions of a drying temperature of 130 ° C. and a drying time of 2 minutes.
In this way, the laminated body in which the urethane type adhesive layer was provided on the base material was obtained.
Subsequently, the silicone-treated surface of the separator was bonded to the surface of the urethane-based pressure-sensitive adhesive layer to obtain a laminate with a separator.
About the obtained laminated body, the wetting speed | rate, the low speed peelability, and the high speed peelability were evaluated by said method. The results are shown in Tables 1 and 2 (the same applies hereinafter).

[Examples 2-6, 8-23, Comparative Examples 1-3]
The formulation of the pressure-sensitive adhesive composition was changed as shown in Tables 1 and 2. Others were obtained in the same manner as in Example 1 and evaluated in the same manner.

[Example 7: Kit for adhesive]
100 parts by weight of polyol (1) as polyol (A), 0.008 parts by weight of catalyst (31) as catalyst (C), 210 parts by weight of ethyl acetate, and 0.4 parts by weight of antioxidant, The main composition was obtained by stirring. 10 parts by mass of the main agent composition was accommodated in a polypropylene container and sealed.
As a hardening | curing agent composition, the polyisocyanate compound (23) which is a polyisocyanate compound (B) was used. 0.58 parts by mass of the curing agent composition was placed in a polypropylene container and sealed.
The pressure-sensitive adhesive kit was formed by combining the container-containing main agent composition and the container-containing curing agent composition.

10 parts by mass of the main agent composition and 0.58 parts by mass of the curing agent composition were blended and stirred to obtain an adhesive composition. In the pressure-sensitive adhesive composition, the polyisocyanate compound (B) is about 17.9 parts by mass and the index is about 200 with respect to 100 parts by mass of the polyol (A).
Using the obtained pressure-sensitive adhesive composition, a pressure-sensitive adhesive film with a separator (laminate) was obtained in the same manner as in Example 1, and evaluated.

As shown in the results of Tables 1 and 2, Examples 1 to 23 using polyols (1) to (6) corresponding to the polyol (A1) in the present invention as the polyol (A) are all based on glass. The wet speed of the adhesive film on the glass substrate was better than those of Comparative Examples 1 to 3 in which the polyol (A) did not have an oxyethylene group.
In Examples 1 to 7 and 9 to 13 using the polyisocyanate compounds (21) to (23) which are trifunctional modified products as the polyisocyanate compound (B), the polyisocyanate compound which is a bifunctional modified product Compared with Example 8 using (22), the low speed and high speed peelability were also good.
In Examples 1 and 2, Example 1 with an index of 150 was superior to Example 2 with an index of 200 in terms of low-speed and high-speed peelability of the adhesive film.
Comparing Examples 1 and 6, when the EO content is the same, Example 1 having a higher Mn of the polyol (A1) has a faster wetting speed on the glass substrate of the adhesive film and better high-speed peelability. It was.
As in Examples 11 and 12, when a polyol having a low EO content and a polyol having a high EO content are combined, the high-speed peelability is excellent as compared with Examples 4 and 6 in which no polyol is combined.
In Examples 14 to 20, the wettability to glass was improved by adding the resin (E), and good wettability was exhibited even for a polarizing plate having irregularities on the substrate surface. In Examples 18 and 20, by increasing the addition amount of the resin (E), the wettability to the polarizing plate A and the polarizing plate B is improved, and the wettability to various substrates is ensured.

1 Test piece 2 Glass plate

Claims (11)

A polyol composition containing a polyol (A) and reacting with a polyisocyanate compound (B) to obtain a pressure-sensitive adhesive,
The polyol composition for pressure-sensitive adhesives, wherein the polyol (A) contains the following polyol (A1).
Polyol (A1): A polyoxyalkylene polyol having 3 or more functional groups, a number average molecular weight of 500 to 2500 per functional group, and an oxyethylene group content of 16 mol% or more based on the total of oxyalkylene groups.   The polyol composition for pressure-sensitive adhesives according to claim 1, comprising 30 to 100% by mass of the polyol (A1) when the polyol (A) is 100% by mass.   The polyol composition for adhesives of Claim 1 or 2 containing resin (E) which does not have a functional group which reacts with an isocyanate group.   The polyol composition for adhesives of Claim 3 which contains the said resin (E) 0.1-50 mass parts with respect to 100 mass parts of the said polyol composition for adhesives. Having a main agent composition housed in a first container and a curing agent composition housed in a second container;
The main agent composition is the polyol composition for pressure-sensitive adhesives according to claim 1 or 2,
The curing agent composition contains a polyisocyanate compound (B),
One or both of the said main ingredient composition and the said hardening | curing agent composition contain the catalyst (C), and the kit for adhesives.   The kit for adhesives of Claim 5 in which one or both of the said main ingredient composition and the said hardening | curing agent composition further contain resin (E) which does not have a functional group which reacts with an isocyanate group. Having a main agent composition housed in a first container and a curing agent composition housed in a second container;
The main agent composition is a polyol composition for pressure-sensitive adhesives according to claim 4,
The curing agent composition contains a polyisocyanate compound (B),
One or both of the said main ingredient composition and the said hardening | curing agent composition contain the catalyst (C), and the kit for adhesives.   The pressure-sensitive adhesive kit according to any one of claims 5 to 7, wherein the polyisocyanate compound (B) contains a trifunctional polyisocyanate compound. A laminate having a substrate and a pressure-sensitive adhesive layer provided on the substrate,
A laminate in which the pressure-sensitive adhesive layer is a cured product of a pressure-sensitive adhesive composition containing a polyol (A) containing the following polyol (A1), a polyisocyanate compound (B), and a catalyst (C).
Polyol (A1): A polyoxyalkylene polyol having 3 or more functional groups, a number average molecular weight of 500 to 2500 per functional group, and an oxyethylene group content of 16 mol% or more based on the total of oxyalkylene groups.   The laminated body of Claim 9 in which the said adhesive composition contains the said resin (E).   The laminate according to claim 9 or 10, wherein the polyisocyanate compound (B) contains a trifunctional polyisocyanate compound.

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