JPS62263270A - Pressure-sensitive adhesive composition - Google Patents

Abstract

PURPOSE:A pressure-sensitive adhesive composition which has no adhesivity at normal temperature, develops adhesivity when heated to >=fixed temperature and keeps adhesivity afterward even if returned to normal temperature, comprising a resin substance and a solid plasticizer as main components. CONSTITUTION:A pressure-sensitive adhesive composition comprising a blend of (A) a resin substance (e.g. styrene-butadiene rubber latex, etc.) and (B) a solid plasticizer (e.g. dicyclohexyl phthalate, etc.) as a main component.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a regular crystal and does not have tackiness, but has a temperature higher than a specified temperature.
This relates to the 111 adhesive composition which develops tackiness when heated and does not lose its tackiness even after returning to normal mt.

[Background of the invention]

This type of adhesive is applied to the surface of a base material to form an adhesive layer that is sticky at room temperature. During storage or transportation, other items become sticky.

[Conventional technology]

Conventionally, in order to store or transport a substrate on which an adhesive layer has been formed on one surface, the adhesive layer has been covered with a release sheet to protect it. Before use, the releasable sheet was peeled off from the adhesive layer.

[Problem that the invention seeks to solve]

However, in the conventional technology mentioned above, in many cases, the releasable sheet that has peeled off from the adhesive layer during use has no choice but to be discarded, so is the releasable sheet a waste? In addition, it was time-consuming to dispose of the discarded releasable sheet.

[Means for solving problems]

The present invention, as a means to solve the above-mentioned conventional problems, consists mainly of a mixture of a resin material and a solid plasticizer, which has no tackiness at room temperature, and the solid plasticizer is heated and melted and mixed with the synthetic resin. The present invention provides a pressure-sensitive adhesive composition characterized in that the synthetic resin is added in an amount sufficient to plasticize the synthetic resin and develop adhesive properties.

The resin substances used in the present invention 1 are methyl acrylate or methacrylate, methyl acrylate or methacrylate, isopropyl acrylate or methacrylate, normal butyl acrylate or methacrylate, 2-ethylhequinyl acrylate or methacrylate, cyclohexyl acrylate or methacrylate, lauryl acrylate or methacrylate, styrene.

α-methylstyrene, vinyl acetate, vinyl propizinate
, vinyl chloride, vinylidene chloride, acrylonitrile, methacrylonitrile, vinyl fluoride, vinylidene fluoride, β-
Hydroxyethyl acrylate or methacrylate, β-hydroxyzolobyl acrylate or methacrylate, Acrylic, TI/pJ1. Metacri/L/Ql
, Malein M, maleic acid heptanoester, itaconic acid,
itaconic acid monoester, crotonic acid, citraconic acid,
Acrylamide, N-methylolacrylamide, N-
Methoxymethylacrylamide, N-ethoxymethylacrylamide, N-butoxymethylacrylamide, methacrylamide, N-methylolmethacrylamide, N
-Methoxymethyl methacrylamide.

Vinyl compounds such as N-ethoxymethyl methacrylamide, N-butoxymethyl acrylamide, glycidyl acrylate or methacrylate, glycidyl ρ allyl ether μ, dimethylaminoethyl acrylate or methacrylate, dimethylaminoisopropyl acrylate or methacrylate, olefins such as ethylene and propylene, butadiene, A homopolymer of polymerizable α-β unsaturated compounds such as diolefins such as chloroprene and isoprene, or a copolymer of two or more of the above α-β unsaturated compounds, or one or more of the above α-β unsaturated compounds. A copolymer of two or more kinds and a small amount of a polyvalent vinyl compound such as diallyl phthalate, pensol, ethylene glycol diacrylate or methacrylate, or natural rubber.

Aopia gum, dammar gum, copal, rosin.

Natural resin substances such as gelatin, casein, starch, modified starch, polyamide resin, polyester resin, polyurethane resin 10,000 oils! fiJll? , terpene trees; synthetic resins such as finger and coumaron resins, synthetic rubbers, natural resins, and natural rubbers, and are substantially thermoplastic. The above resin substances may be used alone or in a mixture of two or more.

The solid plasticizer used in the present invention refers to a compound that is solid at room temperature, melts when heated to a predetermined temperature, that is, above the melting point, and is compatible with the above resin material, such as cyclohexanol, benzene, etc. Akko/L/,
Cyclic alcohols such as furfuryl alcohol and oxalic, malonic, and maleonic acids.

fumaric acid, succinic acid, glutaric acid, adipic acid.

There are diesters with dicarboxylic acids such as phthalic acid.

The resin substance and the solid plasticizer are mixed in a predetermined ratio, and the predetermined ratio means that the resulting mixture does not have tackiness at room temperature, but when heated above the melting point of the solid plasticizer. The ratio is such that tackiness is developed, and this ratio cannot be set uniformly as it is adjusted as appropriate depending on the softening point of the resin material, the compatibility of the resin material and the solid plasticizer, etc. .

The resin material and the solid plasticizer can be mixed by dry mixing, or by using a solution using a solvent or dispersion medium that does not dissolve the solid plasticizer in the resin material.
A method such as wet mixing in which the solid plasticizer is added to emulsion or the like is used. The most common solvent or dispersion medium that does not dissolve the solid plasticizer is water.

In addition to the above-mentioned components, in the present invention, terpene dimer, ester gum, tackifier or plasticizer such as dibutyl phthalate, dioctyl phthalate, tricresyl phosphate, foam, no-fi/resin.

Thermosetting synthetic resins such as melamine resin, urea resin, and epoxy resin, or methacrylic acid and ethylene glycol,
Propylene glycol, Hinako y.

Anaerobic adhesive, toluo, which is a polyhydric ester with polyhydric alcohol such as glycerin and erythritol.

Filling with organic solvents such as xylo, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, n-butyl acetate, cellosomal acetate, methanol, ethanol/L/In-butano-μ, talc, bentonite F, calcium carbonate, etc. However, the component that dissolves the solid plasticizer should be added in a small amount so that the solid plasticizer does not dissolve in the composition.

The pressure-sensitive adhesive composition of the present invention is usually applied to paper, fiber knitted fabrics.

It is applied to the surface of substrates such as nonwoven fabrics, plastic films, and defstick foam sheets. When a solvent or dispersion medium such as water is included, the material is dried at a temperature below the melting point of the solid plasticizer added, yielding a base material having a non-tacky adhesive layer on its surface.

[For production]

The effects of the present invention are as follows.

When heated above the melting point of the solid plasticizer containing the adhesive composition, the solid plasticizer melts and becomes compatible with the resin material, developing permanent tackiness. When an anaerobic adhesive is mixed in the adhesive composition, if it is heated to develop tackiness as described above and then pasted, air will be blocked and the anaerobic adhesive will harden, causing the adhesive to adhere. to move to.

〔Effect of the invention〕

Therefore, in the present invention, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive composition of the present invention is applied to the surface. The formed base material has no adhesiveness at all at room temperature, so there is no need for release paper for storage or transportation, and even if an anaerobic adhesive is added, air will not be blocked by the release paper. Therefore, heat resistance can be significantly improved by curing the anaerobic adhesive after bonding and transferring the adhesive to the adhesive layer.

The present invention can be applied to wallpaper, flooring materials, automobile interior materials, etc., and eliminates the need for release paper, making it possible to achieve extensive rationalization.

Example 1゜ Mix the ingredients below.

Styrene-butadiene rubber latex 80 heavy negative parts (5
Petroleum resin Emulsilon (over 50 parts by weight) 20 parts by weight Dicyclohexyl butarate (powder) 20 parts by weight Sodium polyacrylate 1 part by weight The adhesive composition obtained by the above mixing was applied to the surface of the polyurethane foam sheet. This was applied in an amount of 200 g/ypl and dried under ventilation at 40°C to form an adhesive layer that does not have tackiness at room temperature. When the adhesive layer is heated to 70° C. or higher, it develops tackiness and the polyurethane sheet can be attached to plastic surfaces, metal surfaces, etc.

Example 2 The following recipe was placed in a flask No. 11 equipped with a thermometer, a stirrer, and a condenser, and heated to 80° C. while stirring.

450 g of water 40 g of polyoxyethylene acetate lv 10 g of dialkyl phosuccinate Next, 1 g of ammonium pernulphate was added and dissolved.
Maintaining the temperature at 0°C, add the monomer mixture of the following formulation for 4 hours v1.
Add 1 drop.

Vinyl acetate A/270 g2
- Ethylhexyl acrylate 230g After dropwise addition of the above single substance mixture, the temperature was maintained at 80"C for 2 hours, and then room temperature t
This is cooled to obtain synthetic resin Emulsilon A.

Mix the ingredients below.

Synthetic resin emulsion A To weight part: rosin emulsion silane (50 weight percent) soN weight part: dicyclohexy~adipate 16 parts by weight
The adhesive layer was applied with the utmost care and dried with ventilation at 80°C to form an adhesive layer that does not have tackiness at room temperature. The adhesive layer has 16
When heated to 0°C or higher, it develops tackiness and can be attached to the wall base material surface.

Example 3 A flask similar to Example 2 was charged with the following formulation and heated to 75°C with stirring.

450g of water 450g polyoxyethylene alkyester/L' 85g of sodium alkylsulfonate 15g Then add 1g of potassium barsulfate and dissolve.
Maintaining the temperature at 5°C, add the monomer mixture of the following formulation for 4 hours.
Add dropwise over lff.

Methyl methacrylate 250g2-
240 g of ethylhexyl acrylate (10 g of diaryrho phthalate) After dropwise addition of the above individual mixture, the mixture was maintained at 75 DEG C. for an hour and then cooled to room temperature to obtain a synthetic resin emulsion B.

Mix the ingredients below.

Synthetic resin Emulsilon B 90 parts by weight Terben dimer emulsion soda 7 10Iliffi
parts (50% by weight) dicyclohexyl phthalate) 2 Oit
1 part Methoxycellulose 2 parts The adhesive composition obtained from the above mixture can be applied to the back side of the fiber knitted fabric. The adhesive layer was coated in an amount of 250g and dried under ventilation at 40°C to form an adhesive layer that does not have tackiness at room temperature.

When the adhesive layer is heated to 60'C or more, it develops tackiness and can be attached to substrates such as cardboard, resin boards, iron plates, etc., and provides heat-resistant adhesive.

Example 4 Using the synthetic resin Emuldigon A of Example 2, the following formulation was carried out.

Synthetic resin emulsion A 70M parts Petroleum resin emulsion (50m!it%) 25 parts by weight Ethylene glycol dimethacrylate) 5 parts by electrolytic corrosion Dicyclohexyl phthalate) 16M parts Adhesive composition obtained by the above reaction The material was applied to the surface of an ethylene propylene rubber sheet in an amount of 150 g/m4.
It is dried through ventilation at 0°C to form an adhesive layer that does not have tackiness at room temperature. When the adhesive layer is heated to 70°C or higher, it develops tackiness and can be adhered to the surface of a base material such as metal or plastic, and after being applied, the ethylene glycol dimethacrylate is blocked from air. It hardens and transitions to tangent.

Claims (2)

[Claims] (1) Mainly composed of a mixture of a resin substance and a solid plasticizer, it does not have tackiness at room temperature, and when the solid plasticizer is heated and melted and mixed with the synthetic resin, it plasticizes the synthetic resin and becomes tacky. An adhesive composition characterized in that a sufficient amount is added to cause the (2) The adhesive composition according to claim (1), wherein an anaerobic adhesive is further added to the adhesive composition.