KR20120073851A - Tackifier resin, acrylic adhesive and preparation method thereof - Google Patents

Abstract

PURPOSE: A tackifier composition, an acrylic adhesive, and a manufacture method thereof are provided to fundamentally prevent aging of adhesive and to improve adhesive force for polar surface and non-polar surfaces. CONSTITUTION: A tackifier composition comprises a second acrylic monomer having a first acrylic monomer, hydroxy group, or carboxy group, a photo initiator which has absorption region of 100-400 nano meters wavelength and a molecular weight controller. A manufacturing method of the tackifier composition includes a step of bulk polymerizing by irradiating ultraviolet ray of 100 - 400 nano meters on a resin composition. An acrylic adhesive composition comprises acrylic polymer as a base material resin and the tackifier composition as tackifier.

Description

Tackifier, acrylic adhesive and its manufacturing method {Tackifier resin, acrylic adhesive and preparation method

The present invention provides a tackifying resin composition comprising a first acrylic monomer, a second acrylic monomer having a hydroxy group or a carboxyl group, a photoinitiator having an absorption region of 100 to 400 nm and a molecular weight modifier, and an acrylic polymer as a base resin, and an adhesive. The present invention relates to an acrylic pressure-sensitive adhesive composition comprising the pressure-sensitive adhesive resin composition and a manufacturing method thereof.

In general, double-sided solvent-type acrylic pressure-sensitive adhesive is prepared using an organic solvent, the component is usually an acrylic polymer and a tackifier.

Examples of the tackifying resin used in the production of the acrylic adhesive include rosin, rosin ester resin, terpene-phenol resin, phenol resin, aldehyde resin, rosin ester hydrogenated resin, C5 petroleum resin, C9 petroleum resin, and the like. These tackifiers used in the manufacture of acrylic pressure sensitive adhesives are used for the purpose of supplementing and reinforcing the insufficient properties of acrylic pressure sensitive adhesives composed exclusively of acrylic polymers, and in particular, increase the adhesion to the nonpolar surfaces of acrylic pressure sensitive adhesives, and adhesion to polar surfaces. And an effect of increasing adhesion.

However, while the use of such a tackifier resin has a pure function of improving adhesion to the non-polar and polar surfaces mentioned above, it promotes aging of the adhesive, causing a problem that the adhesive strength decreases with time, and is one of the main physical properties of the adhesive. As well as reducing the (Tack) there is a problem of reducing the heat resistance of the acrylic pressure-sensitive adhesive. In addition, each of the tackifier resin has a color inherent in most, when the acrylic adhesive is prepared by mixing with the acrylic polymer, the acrylic adhesive will have the same color as the tackifier resin. Therefore, the acrylic pressure-sensitive adhesive has a specific color, there is a problem that can not be used for optical or transparent.

The present invention has the advantages of increasing the adhesion to the non-polar surface and the polar surface of the tackifier resin, while the aging of the acrylic adhesive due to the use of the tackifier resin, reduction of the tack (Tack), deterioration of heat resistance and color problems In order to solve the problem is to provide an acrylic pressure-sensitive adhesive prepared using a tackifier resin to replace the existing rosin, rosin ester, terpene-phenol, phenol, aldehyde resin and the like.

Acrylic tackifier resin is an acrylic oligomer having a low molecular weight, the preparation method can be prepared through a general solution polymerization method, emulsion polymerization method, pearl polymerization method and ultraviolet polymerization method, the acrylic tackifier resin of the present invention manufacturing efficiency And the most efficient production in terms of eco-friendly and can be manufactured through environmentally friendly UV polymerization method. In addition, the acrylic tackifier resin of the present invention can be prepared through an acrylic bulk polymerization method that requires no supply of temperature below room temperature, i.e., artificial heat, by using an initiator in which an initiation reaction is caused by ultraviolet rays.

The present invention is a tackifying resin comprising a first acrylic monomer, a second acrylic monomer having a hydroxy group or a carboxyl group, a photoinitiator having an absorption region of 100 to 400nm wavelength and a molecular weight modifier, more specifically 100 parts by weight of the first acrylic monomer , 1 to 20 parts by weight of the second acrylic monomer having a hydroxyl group or carboxyl group, 0.1 to 10 parts by weight of the photoinitiator having an absorption region of 100 to 400nm wavelength and 5 to 30 parts by weight of the molecular weight regulator as a tackifier It is possible to use an acrylic pressure sensitive adhesive with excellent adhesiveness without the use of tackifying resins such as rosin, rosin ester, terpene-phenol, phenol, aldehyde resin, etc., but also to prevent tackiness of the adhesive, to increase tack, and to improve heat resistance. Can provide.

The tackifying resin of the present invention has a high transparency characteristic of acrylic, and when used as a tackifier by mixing with the acrylic polymer constituting the acrylic adhesive, conventional rosin, rosin ester, terpene-phenol, phenol, aldehyde resin, and petroleum resin It improves adhesion to non-polar and polar surfaces, which are advantages of resins, and solves problems of aging of adhesives, reduction of tack, reduction of heat resistance, and color problems, which are disadvantages caused by using existing resins. can do. That is, the adhesive resin of the present invention having a molecular weight of 1,000 ~ 10,000 synthesized through UV bulk polymerization improves the adhesion to the non-polar and polar surface when used in combination with the acrylic polymer, the aging of the adhesive with the acrylic intrinsic environmental resistance It can be essentially suppressed, and can prevent the degradation of the tack of the acrylic adhesive due to the use of the existing tackifying resin.

The acrylic tackifying resin obtained through the present invention is a functional group (Functional Group) that can be cross-linked with the acrylic adhesive in the process of polymerization through ultraviolet bulk polymerization, when the acrylic adhesive is prepared by mixing with the acrylic polymer. The acrylic polymer and the tackifying resin are crosslinked by a crosslinking agent for crosslinking, and thus may have high heat resistance.

In addition, in the case of using the conventional tackifier resin, the pressure-sensitive adhesive has a color, but there is a limit to the use, but the tackifier resin provided through the present invention does not have a color or a slightly yellow color, so there is no limitation in use for optical purposes. There is an advantage that can be applied to the application requiring the pressure-sensitive adhesive and transparency.

The present invention provides a tackifying resin composition comprising a first acrylic monomer, a second acrylic monomer having a hydroxy group or a carboxyl group, a photoinitiator having an absorption region of 100 to 400 nm and a molecular weight modifier.

More specifically, the present invention is 100 parts by weight of the first acrylic monomer, 0.1 to 15 parts by weight of the second acrylic monomer having a hydroxy group or carboxyl group, 0.1 to 10 parts by weight of the photoinitiator having an absorption region of 100 to 400nm wavelength and molecular weight modifier It provides a tackifier resin composition comprising 5 to 30 parts by weight.

The second acrylic monomer having a hydroxyl group or a carboxyl group in the composition of the ultraviolet bulk polymerization tackifying resin composition of the present invention may use 0.1 to 15 parts by weight, more specifically 0.1 to 10 parts by weight. When the amount of the second acrylic monomer is less than 0.1 parts by weight, the adhesive resin does not crosslink with the acrylic polymer, causing a problem of weak heat resistance of the acrylic adhesive. When the amount is more than 15 parts by weight, the polarity of the adhesive resin is increased. This excessively high adhesion to the polar surface is increased, but the problem that the adhesion to the non-polar surface is lowered. In addition, the cross-linking agent used when processing the acrylic pressure-sensitive adhesive is not used to cross-link the acrylic polymer, and a significant portion of the cross-linking agent reacts with the tackifier resin, thereby lowering the heat resistance of the acrylic pressure-sensitive adhesive.

The photoinitiator proposed in the present invention uses light instead of heat, and refers to a material that absorbs light in the ultraviolet region and forms radicals while the molecules decompose. That is, in the present invention, by using a photoinitiator having an absorption region of 100 to 400nm wavelength that is decomposed by ultraviolet light without using a conventional thermal decomposition initiator, to prevent the explosive polymerization reaction by thermal polymerization and to control the reaction through ultraviolet light A stable polymerization can be achieved and a tackifying resin having a more uniform molecular weight distribution can be prepared.

Photoinitiator in the composition of the tackifier resin composition of the present invention may be used 0.1 to 10 parts by weight, more specifically 0.5 to 5 parts by weight. When the amount of the photoinitiator is less than 0.1 parts by weight, it is difficult to perform the polymerization smoothly by ultraviolet irradiation, and there is a problem in that a large amount of unreacted materials that do not react after the reaction is generated. It is very sensitive to ultraviolet light, making it difficult to control the reaction, and there is a problem that the smell caused by the photoinitiator decomposed after the reaction is very severely generated.

The molecular weight modifier used in the present invention is a substance that appropriately adjusts the molecular size of the acrylic polymer produced during the bulk polymerization process through ultraviolet rays, and is used for the purpose of controlling the reaction viscosity of the bulk reaction and the molecular weight of the tackifying resin. The molecular weight regulator in the composition of the tackifier resin composition through the ultraviolet bulk polymerization method of the present invention may be used 5 to 30 parts by weight, more specifically 5 to 20 parts by weight. When the amount of the molecular weight modifier is less than 5 parts by weight, the molecular weight of the tackifier resin bulk-polymerized by ultraviolet light becomes high regardless of the composition of the acrylic main monomer. In addition, when the molecular weight of the tackifier resin increases, the tackifier resin synthesized through UV bulk polymerization does not act as a tackifier and exhibits the same physical properties as a general acrylic polymer, and thus cannot be used as a tackifier. If more than 30 parts by weight, there is a problem that the odor unique to the molecular weight regulator is severely generated in the ultraviolet bulk polymer. On the other hand, since the molecular weight of the tackifier resin is extremely low, when the acrylic adhesive is prepared by mixing with the acrylic polymer may cause a problem that the heat resistance of the acrylic adhesive is very low.

The acrylic monomer which can be used in the present invention is largely a second acrylic monomer having a first acrylic monomer and a hydroxyl group or a carboxyl group.

The first acrylic monomer that can be used in the present invention may be an ester of at least one acrylic acid or methacrylic acid, and may be used regardless of its kind as long as it has an acrylic structure in its molecular structure.

More specifically, methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isobutyl acrylate, t-butyl acrylate, pentyl acrylate, isopentyl acrylate, 2-ethylhexyl acryl Alkyl esters of acrylic acid, such as a latex, isooctyl acrylate, nonyl acrylate, isononyl acrylate, dodecyl acrylate, and a stearyl acrylate, can be used.

In addition, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, pentyl methacrylate, isopentyl methacrylate Alkyl esters of methacrylic acid such as 2-ethylhexyl methacrylate, isooctyl methacrylate, nonyl methacrylate, isononyl methacrylate, dodecyl methacrylate, stearyl methacrylate and the like can be used. . Furthermore, polyoxyethylene glycol monoacrylate type | system | group, polypropylene glycol represented by 2-ethoxy ethoxy ethyl acrylate, 2-ethoxy ethoxy ethyl methacrylate, methoxy ethyl acrylate, methoxy ethyl methacrylate, etc. Monoacrylic-type, polyoxyethylene glycol monomethacrylate type, and polypropylene glycol monomethacrylic-type can be used. Also 2-phenoxyethyl acrylate, ethoxylate phenoxy acrylate, 3,3,5-trimethylcyclohexane acrylate, cyclic triethyl propane foam acrylate, benzyl acrylate, isobornyl acrylate, cyclohexyl acrylate An acrylate or methacrylate which has a cyclic structure in the side chain of acryl and methacryl, such as a rate and its methacrylic acid ester, can be used.

In the present invention, at least one or more second acrylic monomers can be used. As a 2nd acrylic monomer which can be used by this invention, if it is a 1st acrylic monomer containing a hydroxyl and a carboxyl group, it can be used regardless of the kind.

More specific examples of the second acrylic monomer that can be used in the present invention include 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 2-hydroxyethyl methacrylate, 2- An acrylate or methacrylate containing a hydroxy group represented by hydroxypropyl methacrylate and 2-hydroxybutyl methacrylate can be used, and acrylic acid, methacrylic acid, itaconic acid, maleic anhydride and beta carboxylate can be used. An acrylate or methacrylate containing carboxyl groups, such as ethyl acrylate, can be used.

In the present invention, at least one or more of the following photoinitiators may be used. The photoinitiator that can be used in the present invention can be used irrespective of its kind as long as it can absorb radicals in the ultraviolet region having a wavelength of 100 to 400 nm and form radicals by decomposition of molecules.

More specifically 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1-one, diphenyl- (2,4,6-trimethylbenzoyl) -phosphine oxide, Benzyl dimethyl ketal, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1-hydroxy-cyclohexylphenyl-ketone, benzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, methyl 2-benzoyl benzoate, isopropyl thioxanthone, ethyl-4- (dimethylamino) benzoate, 2-ethylhexyl-4-dimethylaminobenzoate, hydroxy dimethyl acetophenone, 2,4-diethyl thioxanthone ( 2,4-diethylthioxathone), 4-phenylbenzophenone, etc. can be used.

As the molecular weight regulator which can be used in the present invention, a thiol system represented by general formula R-SH (R is an alkyl group containing an aliphatic chain or aromatic) such as at least one dodecyl mercaptan or isodecyl mercaptan can be used. It is also possible to use an alphamethylstyrene molecular weight regulator represented by one or more alphamethylstyrene dimers (AMSD). It is also possible to use a mixture of one or more thiol-based and alphamethylstyrenes.

In the present invention, the bulk polymerization may be performed using a vinyl monomer together with the first acrylic monomer. The vinyl monomer that can be used in the present invention can be used regardless of its kind as long as it contains a vinyl group in a molecular structure such as vinyl acetate or styrene. The use of the vinyl monomer is not necessarily necessary, and at least one vinyl monomer may be used in consideration of the characteristics of the acrylic resin.

The method for preparing a tackifying resin through ultraviolet bulk polymerization according to the present invention comprises a first acrylic monomer, a second acrylic monomer having a hydroxy group or a carboxyl group, a photoinitiator, a molecular weight regulator, and ultraviolet irradiation.

In the acrylic monomer used in the present invention, the physical and chemical properties of the synthesized acrylic resin vary depending on the type of the first acrylic monomer used as a basic raw material of the acrylic polymer resin and the amount of the acrylic monomer.

The ultraviolet bulk polymerization method provided by the present invention proceeds through a method of irradiating ultraviolet rays inside the reactor while cooling the reactor with normal temperature cooling water without applying heat at room temperature to the mixed liquid mixed with the above-mentioned tackifier resin composition.

In the present invention, the mixture is made by irradiating light having a wavelength between 100 and 400 nm, which is an ultraviolet region, to decompose the photoinitiator to generate radicals. Ultraviolet rays are irradiated inside the reactor to decompose the photoinitiators used in the polymerization to form radicals which are the starting materials of the acrylic polymerization reaction.

The tackifier resin through the UV bulk polymerization provided by the present invention has a weight average molecular weight in the range of 1,000 to 10,000, and its dispersion degree (PDI) has between 1 and 5.

The molecular weight of the tackifying resin provided in the present invention is suitably about 1,000 to 10,000 based on the weight average molecular weight. When the weight average molecular weight is less than 1,000, when the molecular weight of the tackifier resin is too low to prepare the acrylic adhesive by mixing with the acrylic polymer, the adhesive resin does not crosslink sufficiently with the acrylic polymer, resulting in a problem of lowering the heat resistance of the acrylic adhesive. When the weight average molecular weight is greater than 10,000, a problem arises in that the tackifier resin synthesized through the UV bulk polymerization does not act as a tackifier and exhibits the same physical properties as a general acrylic polymer and thus cannot be used as a tackifier.

The glass transition temperature (Tg) of the tackifying resin provided by this invention is characterized by having the range of -60-110. Control of such glass transition temperature can be adjusted with the combination of the acryl monomer used.

As the ultraviolet ray that can be used in the present invention, if the wavelength is in the range of 100 to 400 nm, it can be used regardless of the method of producing the light such as the high pressure mercury method or the metal halide method and the main wavelength region, and more specifically, 200 nm. A tackifying resin can be prepared by irradiating a wavelength range of 400 nm to 400 nm.

Also in the ultraviolet irradiation method, it is preferable to decrease the intensity and integration energy of the ultraviolet ray at the initial stage of the reaction and gradually increase the intensity and integration energy of the ultraviolet ray as the reaction proceeds to the late stage of the reaction. This is because the decomposition reaction of the used photoinitiator controls the rate of acrylic polymerization, and when the initial amount of light is high, the photoinitiator is rapidly decomposed to increase the acrylic polymerization rate, thereby increasing the heat of reaction, thereby preventing the problem of difficulty in controlling the reaction. That is, when the reaction proceeds in a manner that increases the amount of light as the consumption of the acrylic monomer increases, stable ultraviolet bulk polymerization can be performed.

The present invention also provides an acrylic pressure-sensitive adhesive composition comprising an acrylic polymer as the base resin and the acrylic pressure-sensitive adhesive resin composition as a tackifier.

In one embodiment of the present invention, the tackifier may comprise 5 to 70% by weight, more specifically 10 to 50% by weight of the total composition.

Hereinafter, the present invention will be described by the following examples and comparative examples. However, these are provided only to more easily understand the present invention, but the scope of the present invention is not limited thereto.

Comparative Example 1

An acrylic polymer composed of 95% butyl acrylate and 5% acrylic acid was used, and an acrylic polymer having a molecular weight of 450,000 based on the weight average molecular weight was used, and no tackifying resin was used.

Comparative Example 2

As the acrylic polymer, the acrylic polymer used in Comparative Example 1 was used as it is. To this acrylic polymer, 40 parts by weight of a rosin ester resin having physical properties of Soft Point 80 and an acid value of 18 was added to the acrylic polymer solids to prepare an acrylic pressure-sensitive adhesive, which was used as Comparative Example 2.

Comparative Example 3

As the acrylic polymer, the acrylic polymer used in the acrylic adhesive Comparative Example 1 was used as it is. To this acrylic polymer, 40 parts by weight of a terpene-phenol-based tackifying resin having physical properties of about 45 Soft Point 138 acid value was added to an acrylic polymer solid to prepare an acrylic adhesive, which was used as Comparative Example 3.

Example 1. Preparation of Tackified Resin

One liter flask was equipped with a stirrer and an ultraviolet lamp, 150 g of butyl acrylate, 450 g of methyl methacrylate, 10 g of acrylic acid, 60 g of dodecyl mercaptan, 3 g of diphenyl- (2,4,6-trimethylbenzoyl) -phosphine oxide Nitrogen was added to replace the air at the top of the reactor with nitrogen.

While stirring the mixture inside the reactor, the external temperature was maintained at 25, and the reaction was completed by irradiating UV rays of 365 nm wavelength for 5 hours. The molecular weight, viscosity and conversion of the resulting tackifiers were as follows:

Molecular weight (Mw) = 3500, PDI: 1.8 Viscosity: 9,300 cps Conversion (%) = 98.5%

Example 2. Preparation of Tackified Resin

In a 1 liter flask, agitator and ultraviolet lamp were installed, 300 g of butyl acrylate, 300 g of methyl methacrylate, 10 g of acrylic acid, 60 g of dodecyl mercaptan, 3 g of diphenyl- (2,4,6-trimethylbenzoyl) -phosphine oxide Nitrogen was added to replace the air at the top of the reactor with nitrogen.

While stirring the mixture inside the reactor, the external temperature was maintained at 25, and the reaction was completed by irradiating UV rays of 365 nm wavelength for 5 hours. The molecular weight, viscosity and conversion of the resulting acrylic resin were as follows:

Molecular weight (Mw) = 3,800, PDI: 2.1 Viscosity: 12,000 cps Conversion (%) = 98.3%

Preparation Example 1 Preparation of Acrylic Adhesive

As the composition of the acrylic polymer, the same acrylic polymer as in Comparative Example 1 was used, and the tackifier resin was used in Example 1. Tackifier resin was added to 40 parts by weight based on the acrylic polymer solid to prepare an acrylic pressure-sensitive adhesive was prepared as Preparation Example 1.

Preparation Example 2 Preparation of Acrylic Adhesive

As the composition of the acrylic polymer, the same acrylic polymer as in Comparative Example 1 was used, and the tackifier resin was used in Example 2. Tackifier resin was added to 40 parts by weight of the acrylic polymer solid content to prepare an acrylic pressure-sensitive adhesive was prepared as Preparation Example 2.

The physical properties of each pressure-sensitive adhesive were confirmed based on the comparative examples and production examples. The physical properties were confirmed based on KS-A-1107, and the items of adhesion and heat-resistant cohesion to SUS and PE were evaluated. Ball Tack was evaluated according to the J.Dow method.

The pressure-sensitive adhesive was used as a substrate with a 25-thick PET film, the coating amount was 60. The crosslinking agent was an epoxy-based crosslinking agent, and 1 part by weight of the total amount of the prepared acrylic pressure-sensitive adhesive was used, and aged for 1 week at 50 temperature, and then evaluated for physical properties. The experimental results are shown in Table 1 below:

Physical property test result Ball tack
(No.) SUS Peel
(g / inch) PE Peel
(g / inch) Heat resistance
(80 ℃ X min) Comparative Example 1 8 1200 350 NC Comparative Example 2 5 1600 640 15min Comparative Example 3 2 2100 510 NC Preparation Example 1 8 2000 720 NC Production Example 2 7 2400 630 NC

Looking at the results of the physical properties, it can be seen that in Comparative Example 1, in which the tackifier resin was not used, the adhesion to the SUS and the non-polar surface PE, which are excellent in ball tack and heat resistance, were slightly lower. Can be. Compared with Comparative Example 1, which is a result of not using a tackifier resin, in the case of using the rosin ester resin and the terpene-phenol resin, which are generally used in an acrylic adhesive, compared to Comparative Example 1, heat and ball tack (Ball Tack) It can be seen that this decrease and the adhesion to the SUS and the non-polar surface PE is improved.

In the case of Preparation Example 1 and Preparation Example 2 in which the acrylic tackifier resins prepared in Examples 1 and 2 provided by the present invention were used, No decrease was observed and no decrease in heat resistance was observed. In addition, it was confirmed that the adhesion to SUS and PE, which are polar surfaces, also exhibited almost the same physical properties as those of conventional rosin ester resins or terpene-phenol resins.

In the above results, in the case of commonly used tackifier resins such as rosin ester or terpene-phenol resin, ball tack and heat resistance of the acrylic adhesive are lowered, whereas in the case of acrylic tackifier resin provided by the present invention, It was confirmed that excellent adhesion without a drop in the ball (tack) and heat resistance.

Claims (19)

A tackifying resin composition comprising a first acrylic monomer, a second acrylic monomer having a hydroxy group or a carboxyl group, a photoinitiator having an absorption region having a wavelength of 100 to 400 nm, and a molecular weight modifier.
According to claim 1, 100 parts by weight of the first acrylic monomer, 1 to 20 parts by weight of the second acrylic monomer having a hydroxy group or carboxyl group, 0.1 to 10 parts by weight of a photoinitiator having an absorption region of 100 to 400nm wavelength and 0.5 molecular weight regulator Tackified resin composition, characterized in that it comprises from 10 parts by weight.
According to claim 1, 100 parts by weight of the first acrylic monomer, 5 to 15 parts by weight of the second acrylic monomer having a hydroxyl group or carboxyl group, 0.5 to 5 parts by weight of photoinitiator having an absorption region of 100 to 400nm wavelength and molecular weight regulator 1 Tackified resin composition, characterized in that it comprises from 5 parts by weight.
The method of claim 1, wherein the first acrylic monomer is an alkyl ester of acrylic acid, an alkyl ester of methacrylic acid, a polyoxyethylene glycol monoacrylate, a polypropylene glycol monoacrylic, a polyoxyethylene glycol monomethacrylate , Polypropylene glycol monomethacrylic, and a tackifying resin composition, characterized in that one or two or more selected from the group consisting of acrylates and methacrylates having a cyclic structure in the side chain of acryl or methacryl.
The method of claim 4, wherein the alkyl esters of acrylic acid are methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isobutyl acrylate, t-butyl acrylate, pentyl acrylate, iso Pentyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, nonyl acrylate, isononyl acrylate, dodecyl acrylate and stearyl acrylate;
The alkyl esters of methacrylic acid include methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate and pentyl methacrylate. Selected from the group consisting of acrylate, isopentyl methacrylate, 2-ethylhexyl methacrylate, isooctyl methacrylate, nonyl methacrylate, isononyl methacrylate, dodecyl methacrylate and stearyl methacrylate Become;
The polyoxyethylene glycol monoacrylate type is selected from the group consisting of 2-ethoxyethoxyethyl acrylate, 2-ethoxyethoxyethyl methacrylate, methoxyethyl acrylate and methoxyethyl methacrylate ;
The acrylate and methacrylate having a cyclic structure in the side chain of the acryl or methacryl are 2-phenoxyethyl acrylate, ethoxylate phenoxy acrylate, 3,3,5-trimethylcytohexane acrylate, and Tackified resin composition, characterized in that it is selected from the group consisting of click triethyl propane foam acrylate, benzyl acrylate, isobornyl acrylate, cyclohexyl acrylate and its methacrylic acid ester.
The method of claim 1, wherein the second acrylic monomer having a hydroxy group or a carboxy group is an acrylate or methacrylate having a hydroxy group; And
Tackified resin composition, characterized in that it is selected from the group consisting of acrylates or methacrylates having a carboxyl group.
The acrylates and methacrylates having the hydroxy group are 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxybutyl acrylate and 2-hydroxyethyl methacryl. Latex, 2-hydroxypropyl methacrylate and 2-hydroxybutyl methacrylate;
The acrylate and methacrylates having a carboxyl group are selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic anhydride and betacarboxyethyl acrylate.
The method of claim 1, wherein the photoinitiator is 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, diphenyl- (2,4,6-trimethylbenzoyl) -Phosphine oxide, benzyl dimethyl ketal, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1-hydroxy-cyclohexylphenyl-ketone, benzophenone, 4-benzoyl-4'-methyl Diphenyl sulfide, methyl-2-benzoyl benzoate, isopropyl thioxanthone, ethyl-4- (dimethylamino) benzoate, 2-ethylhexyl-4-dimethylaminobenzoate, hydroxy dimethyl acetophenone, 2,4- Tackified resin composition, characterized in that it is selected from the group consisting of diethyl thioxanthone and 4-phenylbenzophenone.
The tackifier resin composition according to claim 1, wherein the molecular weight regulator is one or a mixture of two or more selected from the group consisting of thiol-based and alphamethylstyrene-based molecular weight regulators.
The tackifying resin composition according to claim 9, wherein the molecular weight modifier is one or a mixture of two or more selected from the group consisting of dodecyl multicaptan, isodecyl multicaptan and alpha methyl styrene dimer (AMSD).
A method for producing a tackifier resin composition comprising the step of bulk polymerization by irradiating 100 nm to 400 nm ultraviolet rays to the resin composition of any one of claims 1 to 10.
The method of claim 11, wherein the molecular weight of the acrylic resin prepared by the method is 1,000 to 100,000 based on the weight average molecular weight.
The method of claim 11, wherein the glass transition temperature of the acrylic resin produced by the method is -60 to 110 ℃.
The method of claim 11, wherein the viscosity of the acrylic resin prepared by the method is 1,000 to 100,000 cps.
The method of claim 11, wherein the ultraviolet light has a wavelength range of 300 nm to 400 nm.
12. The method of claim 11, wherein the polymerization reaction is performed at room temperature.
As the base resin, an acrylic polymer,
An acrylic pressure-sensitive adhesive composition comprising the tackifier resin composition according to any one of claims 1 to 10 as a tackifier.
18. The acrylic pressure sensitive adhesive composition according to claim 17, wherein the pressure sensitive adhesive comprises 5 to 70% by weight of the tackifier.
18. The acrylic pressure sensitive adhesive composition of claim 17, wherein the pressure sensitive adhesive comprises 10 to 50% by weight of the total composition.