JPH0665553A - Hot-melt adhesive composition - Google Patents

Abstract

PURPOSE:To provide a hot-melt adhesive composition which has a suitable melt viscosity at room temperature and can therefore develop excellent adhesiveness without worsening the workability. CONSTITUTION:The title composition comprises 100 pts.wt. base polymer, 10-300 pts.wt. tackifier and 1-100 pts.wt. modified polyolefin prepared by oxidizing a polyolefin with an oxygenous gas and having an acid value of 0.1-100KOHmg/ g and an intrinsic viscosity of 0.01-0.6dl/g.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt adhesive composition, and more particularly, to a hot-melt adhesive composition capable of exhibiting excellent adhesive strength while maintaining good workability because it has an appropriate melt viscosity at room temperature. It relates to a melt adhesive composition.

[0002]

2. Description of the Related Art As an adhesive agent which is applied to a label, craft tape, cloth tape or the like to exert an adhesive effect by heating
Hot melt adhesives prepared by adding a tackifying resin to a base polymer made of a polymer such as polyolefin, polyamide, polyester, vinyl acetate copolymer, cellulose derivative, polymethylmethacrylate, polyvinyl ether and polyurethane are well known. ing.

Usually, hot melt adhesives of this type include
A wax composed of a low molecular weight polyolefin is blended in order to reduce the melt viscosity to obtain good workability and to prevent the adhesive from causing a stringing phenomenon during work.

[0004]

However, many waxes, including the sazol wax that is often used for this purpose, have a problem in that when they are compounded in a hot melt adhesive, the adhesive strength is reduced. However, in recent years, there has been a demand for hot-melt adhesives having a higher adhesive strength than conventional ones.

Therefore, an object of the present invention is to provide a hot melt adhesive composition which has an appropriate melt viscosity at room temperature and can exhibit an excellent adhesive force while maintaining good workability. is there.

[0006]

In order to solve the above-mentioned problems, the present invention provides (A) 100 parts by weight of a base polymer,
(B) 10 to 300 parts by weight of a tackifier, and (C)
Oxidation of polyolefin with oxygen-containing gas, acid value 0.1 to 100 KOHmg / g, and intrinsic viscosity 0.0
Modified polyolefin 1 to 10 having 1 to 0.6 dl / g
The present invention provides a hot melt adhesive composition containing 0 part by weight.

The hot melt adhesive composition of the present invention (hereinafter referred to as "the composition of the present invention") will be described in detail below.

The base polymer (A) used in the composition of the present invention may be a polymer usually used in hot melt adhesives and is not particularly limited, and examples thereof include the following.

1) Polyethylene 2) Ethylene-vinyl acetate copolymer (EVA) 3) Modified EVA such as saponified EVA and graft modified EVA
Polymer 4) Ethylene / (meth) ethyl acrylate (EEA)
An ethylene / (meth) acrylate copolymer such as 5) An ionomer resin obtained by partially neutralizing an ethylene / (meth) acrylic acid copolymer. As a concrete example of these,
Trade name from Mitsui DuPont Polychemical Co., Ltd .: marketed in Himilan. 6) Ethylene / propylene copolymer, ethylene / propylene / (meth) acrylic acid terpolymer 7) Polyamide: A reaction product of a diacid-based acid and a diamine, for example, a fatty acid such as soybean oil, tung oil, or tall oil. Of 2
Reaction products of dimer acid, which is a monomer, with alkyldiamines such as ethylenediamine and diethylenetriamine, and nylons such as nylon 12, and the like. Specific examples thereof include Daiamide (Daicel Chemical Industry), Platinone (Toagosei Chemical Industry), Examples include those marketed under the trade name of Amilan (Toray) and the like. 8) Polyester: For example, those commercially available under the trade names of ester resins 200 and 300 (Toyobo), Vita 1200, 300 (Goodyear) and the like can be mentioned. 9) Propylene-based polymer: atactic polypropylene and the like can be mentioned. 10) Copolymer composed of vinyl aromatic compound and conjugated diene compound, and hydrogenated product thereof: specifically, styrene
Butadiene random copolymer, styrene / isoprene random copolymer, butadiene / polystyrene block copolymer, polystyrene / polyisoprene block copolymer, polystyrene / polyisoprene / polystyrene triblock copolymer, polystyrene / polybutadiene / polystyrene triblock Examples thereof include copolymers, poly (α-methylstyrene) / polybutadiene / poly (α-methylstyrene) triblock copolymers, and hydrogenated products thereof. These polymers are available as commercial products, and hydrogenated products are also commercially available. For example, Califlex TR-1101, TR-1107,
TR-4113 (Shell Chemical Co., Ltd.), Kraton G-65
00, G-6521, G-1650, G-1652, G
Examples thereof include those marketed under the trade names of -1657 (Shell Chemical Co., Ltd.), solvulene, hydrogenated solvulene (Phillips). 11) Other polymers: vinyl acetate copolymer-based polymer, vinyl acetate-crotonic acid copolymer-based polymer, vinyl acetate-phthalic anhydride copolymer-based polymer, vinyl acetate-vinylpyrrolidone-based polymer, cellulose derivative-based polymer, polymethylmethacrylate Polymers, polyvinyl ether polymers, polyurethane polymers, thermosetting resin polymers, syndioctactic polypropylene, ethylene-propylene polymers and the like.

In the composition of the present invention, these (A)
The base polymer may be used alone or in combination of two or more.

The tackifier, which is the component (B) of the composition of the present invention, is added in order to adjust the viscosity of the base polymer (A) at the time of melting and to improve the hot tack property and wettability. Is. The tackifier (B) may be any as long as it can be mixed with the base polymer (A) to improve the hot tack and wetting of the base polymer (A) when heated, There is no particular limitation.

Specific examples of the tackifier (B) include:
Aliphatic hydrogenated tackifier, rosin, modified rosin or esterified products thereof, aliphatic petroleum resin, alicyclic petroleum resin, aromatic petroleum resin, copolymerized petroleum resin of aliphatic and aromatic components Examples of suitable tackifiers include low molecular weight styrene resins, isoprene resins, alkyls, phenol resins, terpene resins, and coumarone / indene resins. In the composition of the present invention, these (B) tackifiers may be used alone or in combination of two or more.

The tackifier (B) can be appropriately selected depending on the base polymer (A) used. For example, when an ethylene-vinyl acetate copolymer (EVA) is used as the (A) base polymer, it is preferable to use an alicyclic petroleum resin and a (modified) rosin.

The modified polyolefin which is the component (C) of the composition of the present invention is obtained by oxidizing the polyolefin with an oxygen-containing gas.

The polyolefin which is the main material of the modified polyolefin (C) is a homopolymer consisting of one type of α-olefin having 2 to 12 carbon atoms or a copolymer consisting of two or more types. Examples of the α-olefin having 2 to 12 carbon atoms include, for example, ethylene, propylene, butene-
1, pentene-1, 2-methylbutene-1, 3-methylbutene-1, hexene-1, 3-methylpentene-1,
4-methylpentene-1,3,3-dimethylbutene-
1, peptene-1, methylhexene-1, dimethylpentene-1, trimethylbutene-1, ethylpentene-
1, octene-1, methylpentene-1, dimethylhexene-1, trimethylpentene-1, ethylhexene-
1, methyl ethyl pentene-1, diethyl butene-1,
Propyl pentene-1, decene-1, methyl nonene-
1, dimethyloctene-1, trimethylheptene-1,
Ethyl octene-1, methyl ethyl heptene-1, diethyl hexene-1, dodecene-1, hexadodecene-1
Etc. As the polyolefin, a low molecular weight polyolefin having an intrinsic viscosity [η] of 0.01 to 0.80 dl / g is preferable.

The production of these low molecular weight polyolefins can be carried out according to known methods. For example, a high pressure radical polymerization method, a production method by a polymerization method such as a medium / low pressure polymerization method performed in the presence of various transition metal compound catalysts such as a Ziegler catalyst; or a high molecular weight polyolefin produced by the polymerization method A thermal decomposition method for lowering the molecular weight of the molecular weight polyolefin by thermal degradation or radical degradation using a peroxide can be used.

As a method for producing the (C) modified polyolefin by oxidizing the above-mentioned polyolefin, there is a method of bringing it into contact with an oxygen-containing gas in a molten state (Japanese Patent Publication No. 48).
-37991 publication). For example, it can be carried out according to a method such as heating the polyolefin to a temperature above the softening point to melt it in an autoclave and bubbling an oxygen-containing gas while stirring.

The oxygen-containing gas used for the oxidation of the polyolefin includes pure oxygen, air, etc., and is appropriately selected.

In the present invention, the (C) modified polyolefin is an ethylene-vinyl acetate copolymer (EVA).
The acid value is 0.1 to 100 KOHmg / in that the hot melt adhesive has good compatibility with polar polymers such as, and has improved threading prevention properties and good workability.
g, preferably 0.5 to 80 KOHmg / g.

Further, the (C) modified polyolefin is excellent in that the hot-melt adhesive composition has a melt viscosity which exhibits good workability, and the hot-melt adhesive composition has a cohesive force within an appropriate range. The intrinsic viscosity is from 0.01 to 0.6 dl / g, preferably from 0.05 to 0.5 dl / g, from the viewpoint of obtaining adhesive strength.

In the composition of the present invention, the modified polyolefin (C) may be used alone or in combination of two or more.

In the composition of the present invention, the blending ratio of the above-mentioned (A) pace polymer, (B) tackifier and (C) modified polyolefin is (A) base polymer 100.
The ratio of 10 to 300 parts by weight of (B) tackifier and 1 to 100 parts by weight of (C) modified polyolefin with respect to parts by weight, where (A) the cohesive strength of the base polymer and (B) the tackifier. The adhesive strength of (A) and the function of the modified polyolefin (C) are exerted in a well-balanced manner, and the effect of the present invention is further improved. The ratio of 20 parts by weight and 20 to 80 parts by weight of (C) modified polyolefin is preferable.

Further, when an unmodified polyolefin, for example, Sazol wax (H-1, manufactured by Sazol Co.), which is usually added to hot melt adhesives, is added to the composition of the present invention, the melt viscosity is lowered, Workability can be further improved.

The composition of the present invention may be used in various types other than the above-mentioned (A) pace polymer, (B) tackifier and (C) modified polyolefin, as long as the purpose of the present invention is not impaired. Compounding agents such as softening agents, stabilizers, fillers, antioxidants and the like can be added.

The composition of the present invention is prepared by adding the above-mentioned (A) pace polymer, (B) tackifier and (C) modified polyolefin, and, if necessary, the above-mentioned various components at a predetermined mixing ratio. It can be carried out by supplying to a mixer such as Brabender, heating and melting and mixing, and forming this into a desired shape, for example, a granular shape, a flake shape, a rod shape or the like.

The composition of the present invention is prepared by heating and melting this composition,
The adhesive layer is applied to an object to be coated such as cloth, kraft paper, aluminum foil, and polyester film by an ordinary method to be used.

[0027]

EXAMPLES Examples will be described below, but the present invention is not limited to the examples.

Reference Example <Synthesis of Modified Polyethylene> Unmodified Polyethylene Wax (Mitsui High Wax 220P: Intrinsic Viscosity 0.13 dl)
/ G, acid value: 0 KOHmg / g, 800 g of Mitsui Petrochemical Industry Co., Ltd.) were charged into a 1.5 l glass reactor and heated and melted at 160 ° C. Then, air is added to 4.
The wax in the molten state was blown at a flow rate of 5 l / min to carry out the oxidation reaction. After 5 hours, the reaction was terminated and cooled to obtain modified polyethylene (hereinafter referred to as "W-1"). When the intrinsic viscosity and acid value of this modified polyethylene were measured, they were 0.13 dl / g and 1 KOHmg, respectively.
/ G.

Example 1 Ethylene-vinyl acetate copolymer (EVA # 220: Mitsui DuPont Chemical Co., Ltd.) 40
g, aliphatic petroleum resin (HI-LETS T-500X: manufactured by Mitsui Petrochemical Industry Co., Ltd.) 40 g, and the above W-12
0 g was melt mixed at 180 ° C. to prepare a hot melt adhesive composition. The melt viscosity of the obtained hot melt adhesive composition was 4350 cp at 160 ° C and 2580 cp at 180 ° C.
It was cp. This hot melt adhesive composition is applied to an aluminum foil (50 μm) to a thickness of 15 μm, and the applied surfaces are bonded to each other, and a heat sealing machine is used to measure an upper bar temperature of 170 ° C., a lower bar temperature of 70 ° C., and a pressing force. 1 kg / c
A laminated sheet was prepared by heat sealing under the conditions of m ² and a pressing time of 2 seconds. This laminated sheet was cut into a width of 25 mm to prepare a sample, and a T-type peel test was performed at a measurement temperature of 0 to 80 ° C. to measure the adhesive strength (pulling speed 300 mm / m.
in). The results are shown in Tables 2 and 3.

(Examples 2 and 3) In the same manner as in Example 1 except that a mixture containing W-1 / sazole wax in a ratio shown in Table 1 was used in place of W-1 in each example.
A hot melt adhesive composition was prepared, and the melt viscosity was measured and the adhesive strength was measured by a T-type peel test. The results are shown in Tables 2 and 3.

Comparative Example 1 Example 1 except that only Sazole wax was used in the ratio shown in Table 1 instead of W-1.
Similarly to the above, a hot melt adhesive composition was prepared, and the melt viscosity was measured and the adhesive strength was measured by a T-type peel test. The results are shown in Tables 2 and 3.

(Comparative Example 2) Example 1 except that only unmodified polyethylene wax (Mitsui High Wax 220P, manufactured by Mitsui Petrochemical Industry Co., Ltd.) was used in the proportion shown in Table 1 instead of W-1. Similarly, a hot melt adhesive composition was prepared, and the melt viscosity was measured and the adhesive strength was measured by a T-type peel test. The results are shown in Tables 2 and 3.

[0033]

[0034]

[0035]

[0036]

The hot melt adhesive composition of the present invention comprises:
Since it has an appropriate melt viscosity at room temperature, it can exhibit excellent adhesiveness while maintaining good workability.

Claims (1)

[Claims] 1. An acid value of 0.1 to 100 KOH mg /, which is obtained by oxidizing (A) a base polymer of 100 parts by weight, (B) a tackifier of 10 to 300 parts by weight, and (C) a polyolefin with an oxygen-containing gas. g, and modified polyolefin 1 having an intrinsic viscosity of 0.01 to 0.6 dl / g
A hot melt adhesive composition comprising ˜100 parts by weight.