JP2000256630A - Sheet or tape for surface protection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sheet which scarcely leaves an adhesive when peeled off by forming a layer of a pressure adhesive composition comprising a blend of a polyfunctional isocyanate compound with a polyurethane polyol obtained through the reaction of a polyester polyol, a polyether polyol and an organic polyisocyanate in the presence of a specified number of catalysts on one side of a base material for surface protection. SOLUTION: The pressure adhesive composition is formed by blending a polyfunctional isocyanate compound with a polyurethane polyol obtained through the reaction of a polyester polyol, a polyether polyol and an organic polyisocyanate in the presence of two catalysts, preferably at least one of which is tin 2-ethylhexanoate. It is desirable that 10-80 wt.% of polyols comprising polyester polyols and polyether polyols comprise those having a molecular weight of 2,000 to 4,000 and at least three OH groups in the molecule. The composition has high cohesive power, does not gel, and does not suffer poor compatibility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a glass plate, a metal plate, a wooden plate, a decorative plate, a plastic plate, and the like, or an intermediate product and a product using the same during production, processing, transportation, or preservation thereof. Surface protection sheets and tapes that temporarily protect from dust, oil stains, scratches, rainwater, sunburn, etc., are easy to stick to and peel off from adherends, and do not cause adhesive residue on adherends It is.

[0002]

2. Description of the Related Art Conventionally, pressure-sensitive adhesives used for surface protective sheets and tapes include acrylic resins, vinyl acetate resins, synthetic rubber resins, mainly copolymerized with 2-ethylhexyl acrylate, butyl acrylate, acrylic acid and the like. Natural rubber resin was used. However, although these are excellent in adhesiveness, when they are peeled off from the adherend due to insufficient re-peelability, adhesive residue on the adherend occurs,
There has been a problem that the adhesive strength tends to change depending on the temperature. In particular, there is a problem that the surface of the adherend is easily stained in a high temperature environment. If glue residue occurs, it will have an adverse effect when applying and surface-treating the adherend.

On the other hand, a coated article using a urethane-based pressure-sensitive adhesive can satisfy various physical properties generally required for a coated article, but increases the viscosity of a resin solution during the synthesis of a urethane resin, controls a reaction, and costs raw materials. There was a problem. In particular, it has been difficult to control the compatibility and crosslinkability of the resin solution with the progress of the reaction to obtain a resin having desired physical properties.

[0004]

The present invention relates to a sheet and a tape for protecting a surface, which have little adhesive residue when peeled off.
More specifically, the conventional acrylic pressure-sensitive adhesive, the adhesive residue when using a rubber-based pressure-sensitive adhesive, the increase with time of the adhesive force, the disadvantage that it is difficult to obtain a stable adhesive force, and the conventional urethane adhesive described above The present invention relates to a sheet or tape for surface protection in which various disadvantages of the agent are improved.

[0005]

Conventionally, in the production of urethane pressure-sensitive adhesives, two or more kinds of polyols such as polyester polyol and polyether polyol having different compatibility and reactivity and an organic polyisocyanate compound have been used in the presence of a single catalyst. Was reacting below. In this system, there was a problem that the reaction solution often became turbid or gelled. In particular, it is remarkable when the reaction temperature is 100 ° C. or lower. Therefore, as a result of various studies of reaction conditions, it was found that a polyurethane resin can be obtained by using two types of catalysts without causing the reaction solution to become turbid or gelled.

It has been found that a sheet or tape for surface protection using the urethane resin as a pressure-sensitive adhesive composition layer maintains the desired tackiness and has no adhesive residue even in a high temperature environment.

That is, in the first invention, in a pressure-sensitive adhesive composition layer formed on one side of a surface protecting substrate, the pressure-sensitive adhesive composition comprises two types of polyester polyols, polyether polyols, and organic polyisocyanates. The present invention relates to a sheet or tape for surface protection, comprising a polyurethane polyol (A) reacted with a catalyst and a polyfunctional isocyanate compound (B) mixed therein. In the second invention, 10 to 80% by weight of a polyol composed of a polyester polyol and a polyether polyol has a molecular weight of 2,000 to 4,000 and has at least three or more hydroxyl groups in one molecule. A sheet or tape for surface protection according to the first aspect of the invention.

The third invention relates to the sheet or tape for surface protection according to the first invention, wherein one of the two catalysts is tin 2-ethylhexanoate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

Examples of the surface protective sheet and tape base material used in the present invention include synthetic resin films such as polyester film, polyethylene film, vinyl chloride film, nylon film, polypropylene film, acrylic foam film, urethane foam film, art paper, There are papers such as coated paper, synthetic paper and plain paper, cloths such as cloth and non-woven fabric, and composites thereof, which can be selected according to the intended use environment. For example, in the case of processing while protecting with a surface protection sheet or tape, a polyethylene film having excellent workability and flexibility and a large tensile strength is excellent.
When further impact resistance is required, a foam film is excellent.

The urethane pressure-sensitive adhesive used in the present invention is produced using known polyester polyols, polyether polyols, organic isocyanates and the like as raw materials. Examples of the acid component of the polyester polyol include terephthalic acid, adipic acid, azelaic acid, sebacic acid, phthalic anhydride, isophthalic acid, and trimellitic acid, and the glycol components include ethylene glycol, propylene glycol, diethylene glycol, butylene glycol, and 1,6. -Hexane glycol, 3-methyl-1,5-pentanediol, 3,3'-dimethylolheptane, polyoxyethylene glycol, polyoxypropylene glycol,
1,4-butanediol, neopentyl glycol, butylethylpentanediol, and glycerin, trimethylolpropane, pentaerythritol, and the like as polyol components. Other examples include polyester polyols obtained by ring-opening polymerization of lactones such as polycaprolactone, poly (β-methyl-γ-valerolactone) and polyvalerolactone. The molecular weight of the polyester polyol can be used from a low molecular weight to a high molecular weight, and is preferably a polyester polyol having a molecular weight of 1,000 to 5,000 and having two or more functional groups.

Known polyether polyols are used as the polyether polyol used in the present invention. For example, propylene glycol, ethylene glycol, glycerin, using a low molecular weight polyol such as trimethylolpropane as an initiator, ethylene oxide, propylene oxide, butylene oxide, polyether polyol obtained by polymerizing an oxirane compound such as tetrahydrofuran, specifically Specifically, those having two or more functional groups, such as polypropylene glycol, polyethylene glycol, and polytetramethylene glycol, are used. The molecular weight of the polyether polyol can be used from a low molecular weight to a high molecular weight, but preferably the molecular weight is 1,
It is a polyether polyol having a bifunctional or higher functionality of 000 to 5,000.

A polyester polyol used in the present invention,
When the molecular weight of the polyether polyol is 1,000 or less, the reactivity becomes high, and it becomes difficult to control the molecular weight and the crosslinked structure. On the other hand, if the molecular weight is 5,000 or more, the reaction requires time and the cohesive strength of the urethane pressure-sensitive adhesive decreases. Of the polyol mixture composed of polyester polyol and polyether polyol, 10 to 80% by weight has a molecular weight of 2,
When it is 000 to 4,000 and has at least three or more hydroxyl groups in one molecule, a sheet or tape for surface protection excellent in cohesive force and removability can be obtained.

In the present invention, if necessary, some glycols such as ethylene glycol, 1,4-butanediol, neopentyl glycol, butylethylpentanediol, glycerin, trimethylolpropane, and pentaerythritol; ethylenediamine; Polyvalent amines such as aminoethylethanolamine, isophoronediamine and xylylenediamine can also be used in combination.

Examples of the organic polyisocyanate compound used in the present invention include known aromatic polyisocyanates, aliphatic polyisocyanates, araliphatic polyisocyanates, and alicyclic polyisocyanates.

As aromatic polyisocyanates, 1,3
-Phenylene diisocyanate, 4,4'-diphenyl diisocyanate, 1,4-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate,
2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4′-toluidine diisocyanate, 2,4,6-triisocyanate toluene, 1,
Examples thereof include 3,5-triisocyanatebenzene, dianisidine diisocyanate, 4,4'-diphenylether diisocyanate, and 4,4 ', 4 "-triphenylmethane triisocyanate.

Examples of the aliphatic polyisocyanate include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, Examples include 2,4,4-trimethylhexamethylene diisocyanate.

As the araliphatic polyisocyanates, ω, ω′-diisocyanate-1,3-dimethylbenzene, ω, ω′-diisocyanate-1,4-dimethylbenzene, ω, ω′-diisocyanate-1,4-diethylbenzene , 1,4-tetramethylxylylene diisocyanate, 1,3-tetramethyl xylylene diisocyanate, and the like.

As the alicyclic polyisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, 1,3-cyclopentane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, methyl-2 , 4-cyclohexanediisocyanate, methyl-
2,6-cyclohexane diisocyanate, 4,4'-
Methylene bis (cyclohexyl isocyanate), 1,
4-bis (isocyanatomethyl) cyclohexane,
1,4-bis (isocyanatomethyl) cyclohexane and the like can be mentioned.

In addition, a trimethylolpropane adduct of the above polyisocyanate, a burette that has been reacted with water, a trimer having an isocyanurate ring, and the like can also be used in combination.

As the polyisocyanate used in the present invention, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (isophorone diisocyanate) and the like are preferable.

As the catalyst used in the present invention, a known catalyst can be used. For example, tertiary amine compounds, organometallic compounds and the like can be mentioned.

Examples of the tertiary amine compound include triethylamine, triethylenediamine, 1,8-diazabicyclo (5,4,0) -undecene-7 (DBU) and the like.

Examples of the organometallic compound include a tin compound and a non-tin compound.

As the tin compound, dibutyltin dichloride, dibutyltin oxide, dibutyltin dibromide,
Dibutyltin dimaleate, dibutyltin dilaurate (D
BTDL), dibutyltin diacetate, dibutyltin sulfide, tributyltin sulfide, tributyltin oxide, tributyltin acetate, triethyltin ethoxide, tributyltin ethoxide, dioctyltin oxide, tributyltin chloride, tributyltin trichloroacetate, 2-ethylhexanoic acid Tin etc. are mentioned.

Examples of the non-tin compounds include titanium compounds such as dibutyl titanium dichloride, tetrabutyl titanate and butoxy titanium trichloride, and lead compounds such as lead oleate, lead 2-ethylhexanoate, lead benzoate and lead naphthenate. Iron, such as iron, 2-ethylhexanoate and iron acetylacetonate; cobalt, such as cobalt benzoate and cobalt 2-ethylhexanoate; zinc, such as zinc naphthenate and zinc 2-ethylhexanoate; zirconium naphthenate And the like.

When these catalysts are used, in a system in which two kinds of polyols, that is, a polyester polyol and a polyether polyol, are present, due to a difference in reactivity and compatibility, a system of a single catalyst gels or a reaction solution is formed. The problem of cloudiness is likely to occur. By using two types of catalysts, the reaction rate, reactivity, and the like can be controlled, and these problems can be solved. As the combination, a tertiary amine / organic metal type, tin type / non-tin type, tin type / tin type or the like is used, preferably tin type / tin type, more preferably dibutyltin dilaurate and 2-ethylhexane. It is a combination of tin acid. The compounding ratio is tin 2-ethylhexanoate / dibutyltin dilaurate <1 by weight. More preferably, it is 0.2 to 0.6. If the compounding ratio is 1 or more, gelation is likely to occur due to the balance of the catalytic activity. These catalysts are used in an amount of 0.01 to 1.0% by weight based on the total amount of the polyol and the organic polyisocyanate.

The polyfunctional isocyanate compound (B) used in the present invention includes the above-mentioned organic polyisocyanate compounds and their trimethylolpropane adducts,
A buret body reacted with water, a trimer having an isocyanurate ring, or the like is used.

In order to obtain the polyurethane polyol (A), various methods are possible, for example, 1) charging the whole amount,
2) It is also possible to charge a polyester polyol, a polyether polyol, and a catalyst in a flask and add dropwise an organic polyisocyanate. In particular, the method 2) is preferable for controlling the reaction.

The mixing ratio of the polyurethane polyol (A) and the polyfunctional isocyanate (B) used in the present invention is 1 to 20 parts (B) per 100 parts (parts by weight) of (A). If it is 1 part or less, the cohesive strength decreases, and if it is 20 parts or more, the adhesive strength decreases. Preferably it is 2 to 10 parts.

The reaction temperature for obtaining the polyurethane polyol (A) of the present invention is preferably 100 ° C. or lower. More preferably, the temperature is from 85C to 95C. If the reaction temperature is 100 ° C. or higher, it is difficult to control the reaction rate and the crosslinked structure, and it is difficult to obtain a polyurethane polyol (A) having a predetermined molecular weight.

As the solvent used in the present invention, known solvents can be used. Examples include methyl ethyl ketone, ethyl acetate, toluene, xylene, acetone and the like. Toluene is particularly preferred in view of the solubility of the polyurethane polyol (A) and the boiling point of the solvent.

In the urethane pressure-sensitive adhesive composition layer constituting the present invention, fillers such as talc, calcium carbonate, titanium oxide, etc., tackifiers, coloring agents, ultraviolet absorbers, antioxidants, and defoamers may be used, if necessary. And additives such as light stabilizers.

In the present invention, the urethane pressure-sensitive adhesive composition layer is formed on a surface protecting substrate by a known method. For example, after coating and drying with a roll coater, blade coater, gravure coater, or the like, 5 to 100 μm, preferably 20 to 50 μm
m of a coating film is formed.

Although it is possible to form the pressure-sensitive adhesive composition layer directly on the surface protecting substrate, the adhesion between the substrate and the pressure-sensitive adhesive composition layer is determined based on the balance between the substrate surface and the adherend surface. Agent layer,
Alternatively, a strong adhesive layer can be provided. Examples of adhesives and strong adhesives include acrylic resins, vinyl acetates, urethanes, ethylene / vinyl acetates, and synthetic rubbers.

The surface protection sheet and tape of the present invention can be used for producing, processing, transporting glass plates, metal plates, wooden plates, decorative plates, plastic plates, etc., or intermediate products and products using these.
Alternatively, it is widely used for storage and the like.

The urethane pressure-sensitive adhesive which is one of the features of the present invention can be obtained by the following synthesis examples.

Synthesis Example 1 Polyester polyol P-1 was placed in a four-necked flask equipped with a stirrer, a reflux condenser, a nitrogen inlet, a thermometer, and a dropping funnel.
010 (bifunctional polyester polyol, OH value 11
2, 108 g of Kuraray Co., Ltd., polyether polyol G-2000 (trifunctional polyether polyol, O
H value 112, manufactured by Asahi Denka Co., Ltd.) 67 g, hexamethylene diisocyanate (Sumitomo Bayer Co., Ltd.) 25
g, 134 g of toluene, 0.03 g of iron 2-ethylhexanoate and 0.04 g of lead naphthenate as catalysts, and 9
The temperature was gradually raised to 0 ° C., and the reaction was performed for 4 hours. The residual isocyanate group is confirmed by an infrared spectrophotometer (IR). If the remaining isocyanate group disappears, the reaction is terminated and cooled. This reaction solution was colorless and transparent, had a solid content of 60%, viscosity of 3,000 cps, MN (number average molecular weight) of 15,000, and MW (weight average molecular weight) of 50,000.
00.

Synthesis Example 2 Polyester polyol F-2 was placed in a four-necked flask equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel.
010 (trifunctional polyester polyol, OH value 85,
31 g, Kuraray Co., Ltd., polyether polyol P
P-2000 (bifunctional polyether polyol, OH value 56, manufactured by Sanyo Chemical Industries, Ltd.) 152 g, isophorone diisocyanate (manufactured by Huls Japan KK) 17
g, 134 g of toluene, 0.03 g of iron 2-ethylhexanoate and 0.02 g of tin 2-ethylhexanoate as catalysts, the temperature was gradually raised to 90 ° C., and the mixture was reacted for 3 hours.
The residual isocyanate group is confirmed by IR, and if it has disappeared, the reaction is terminated and cooled. The reaction solution was colorless and transparent and had a solid content of 6.
0%, viscosity 3,000 cps, MN 16,000, MW
It was 55,000.

Synthesis Example 3 Polyester polyol P-1 was placed in a four-necked flask equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel.
010 (bifunctional polyester polyol, OH value 11
2, Kuraray Co., Ltd.) 81 g, polyether polyol G-3000B (trifunctional polyether polyol, O
H value 56, Asahi Denka Co., Ltd.) 101 g, hexamethylene diisocyanate (Sumitomo Bayer Co., Ltd.) 19
g, ethyl acetate 134 g, iron 2-ethylhexanoate 0.03 g as a catalyst, tetrabutyl titanate 0.02 g
, And the temperature was gradually raised to 75 ° C. to react for 5 hours.
The residual isocyanate group is confirmed by IR, and if it has disappeared, the reaction is terminated and cooled. The reaction solution was colorless and transparent and had a solid content of 6.
0%, viscosity 3,500 cps, MN 18,000, MW
60,000.

Synthesis Example 4 Polyester polyol P-1 was placed in a four-necked flask equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel.
010 (bifunctional polyester polyol, OH value 11
2, Kuraray Co., Ltd.) 81 g, polyether polyol G-3000B (trifunctional polyether polyol, O
H value 56, Asahi Denka Co., Ltd.) 101 g, hexamethylene diisocyanate (Sumitomo Bayer Co., Ltd.) 19
g, 134 g of toluene, 0.05 g of dibutyltin dilaurate as a catalyst, and 0.02 g of tin 2-ethylhexanoate were gradually heated to 90 ° C. and reacted for 2 hours.
The residual isocyanate group is confirmed by IR, and if it has disappeared, the reaction is terminated and cooled. The reaction solution was colorless and transparent and had a solid content of 6.
0%, viscosity 3,300 cps, MN 15,500, MW
46,000.

Synthesis Example 5 Polyester polyol P-1 was placed in a four-necked flask equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel.
010 (bifunctional polyester polyol, OH value 11
2, 67 g of Kuraray Co., Ltd., polyether polyol PP-2000 (bifunctional polyether polyol, O
H value 56, manufactured by Sanyo Chemical Industries, Ltd.) 107 g, hexamethylene diisocyanate (manufactured by Sumitomo Bayer, Ltd.)
26 g, toluene 134 g, dibutyltin dilaurate 0.03 g as a catalyst, tin 2-ethylhexanoate 0.02 g
g, the temperature was gradually raised to 90 ° C., and the reaction was carried out for 2 hours. The residual isocyanate group is confirmed by IR, and if it has disappeared, the reaction is terminated and cooled. The reaction solution was colorless and transparent, solid content was 60%, viscosity was 3600 cps, MN was 16,500,
W50,000.

Synthesis Example 6 Polyester polyol P-1 was placed in a four-necked flask equipped with a stirrer, a reflux condenser, a nitrogen inlet, a thermometer, and a dropping funnel.
010 (bifunctional polyester polyol, OH value 11
2, Kuraray Co., Ltd.) 56 g, polyether polyol PP-2000 (bifunctional polyether polyol, O
H value 56, manufactured by Sanyo Chemical Industries, Ltd.) 91 g, isophorone diisocyanate (manufactured by Huls Japan KK) 2
1 g, Takenate D-140N (isophorone diisocyanate trimethylolpropane adduct, manufactured by Takeda Pharmaceutical Co., Ltd.) 31 g, and toluene 134 g were charged.
The temperature is gradually raised to 100 ° C., and the reaction is performed for 5 hours. The residual isocyanate group is confirmed by IR, and if it has disappeared, the reaction is terminated and cooled. The reaction solution was colorless and transparent, the solid content was 60%, the viscosity was 3300 cps, the MN was 15,000, and the MW was 550,000.
It was 0.

Synthesis Example 7 Polyester polyol P-2 was placed in a four-necked flask equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel.
010 (bifunctional polyester polyol, OH value 56,
90 g, Kuraray Co., Ltd., polyether polyol G
-2000 (trifunctional polyether polyol, OH value 8
5, 24 g of Asahi Denka Co., Ltd.), 17 g of hexamethylene diisocyanate (manufactured by Sumitomo Bayer Ltd.), 134 g of ethyl acetate, and 0.1 g of dibutyltin dilaurate as a catalyst.
05 g was charged, the temperature was gradually raised to 80 ° C., and the reaction was carried out for 3 hours. The residual isocyanate group is confirmed by IR, and if it has disappeared, the reaction is terminated and cooled. This reaction solution was slightly turbid, with a solid content of 50%, a viscosity of 3,700 cps, and MN16,
500, MW 54,000.

Synthesis Example 8 75 g of butyl acrylate, 20 g of 2-ethylhexyl acrylate, 5 g of 2-hydroxyethyl acrylate, 135 g of ethyl acetate, 15 g of toluene, 15 g of toluene A solution containing 0.2 g of benzoyl oxide was placed in a reactor equipped with a reflux condenser, and heated at 80 to 85 ° C. under a nitrogen gas stream.
Perform a time reaction. This solution is colorless and transparent and has a solid content of 40%.
The viscosity was 5,200 cps.

[0046]

The present invention will be described in detail with reference to the following examples.

Table 1 shows the composition of the polyurethane pressure-sensitive adhesive.

Table 2 shows the results of the adhesive strength and adhesive residue tests.

The test items are as follows. Adhesive strength: 25 μm dry coating film of the above adhesive solution on release paper
And dried at 100 ° C. for 2 minutes to prepare a coated product. Aged at room temperature for one week. An adhesive sheet made of a PET film substrate is adhered to a stainless steel plate (SUS304) having a thickness of 2 mm at 23 ° C. and 65% RH.
20 minutes after roll-press bonding according to IS, peeling strength (180 degree peel, pulling speed 3) with a shopper type peeling tester
00 mm / min). Adhesive residue: 25% after sticking adhesive sheet to various adherends
The solution was stored at 50 ° C. and 50 ° C. for 1 day, and the adhesive residue was visually evaluated. After peeling, ◎ indicates no adhesive transfer to the adherend, ○ indicates very slight transfer, △ indicates partial transfer, and × indicates complete transfer.

[0050]

[Table 1]

For the compounding, 4 g of the polyfunctional isocyanate compound (B) was added to 100 g of the solid content of the polyurethane polyol (A). Polyfunctional isocyanate compound (B) Takenate D-160N (hexamethylene diisocyanate trimethylolpropane adduct),
Takeda Pharmaceutical Co., Ltd.)

[0052]

[Table 2]

From the above results, it is understood that the surface protective sheet and tape according to the present invention have no adhesive residue and excellent removability by using the urethane adhesive composition for the adhesive layer.

[0054]

According to the present invention, the polyurethane pressure-sensitive adhesive constituting the sheet and tape for surface protection can be a resin having high cohesion without gelation and poor compatibility by using two kinds of catalysts in the synthesis thereof. . Sheets and tapes for surface protection using the pressure-sensitive adhesive show good removability.

Continued on front page F-term (reference) 4J004 AA14 AA17 AB01 CA02 CA04 CA05 CA06 CB01 CB02 CB04 CC02 CE01 FA04 4J034 BA03 DA01 DB05 DC02 DC50 DF01 DF11 DF12 DF16 DF20 DF21 DF22 DG01 DG03 DG04 HC11 HC17 HC11 HC07 HC52 HC61 HC64 HC67 HC70 HC71 HC73 JA02 KA01 KB02 KC08 KC16 KC17 KC18 KC35 KD02 KD04 KD12 KE02 QA02 QA05 QC05 RA07 RA19 4J040 EF111 EF131 HB24 JA09 JB09 KA14 LA01 LA05 LA06 QA01

Claims (3)

[Claims] 1. A pressure-sensitive adhesive composition layer formed on one surface of a surface protecting substrate, the pressure-sensitive adhesive composition being reacted with a polyester polyol, a polyether polyol, and an organic polyisocyanate using two types of catalysts. A sheet or tape for surface protection, comprising a polyurethane polyol (A) and a polyfunctional isocyanate compound (B). 2. A polyol comprising a polyester polyol or a polyether polyol, wherein 10 to 80% by weight has a molecular weight of 2,000 to 4,000 and has at least three or more hydroxyl groups in one molecule. The sheet or tape for surface protection according to claim 1, characterized in that: 3. The sheet or tape for surface protection according to claim 1, wherein one of the two catalysts is tin 2-ethylhexanoate.