JPH03220264A - Resin composition and ink composition - Google Patents

Abstract

PURPOSE:To prepare a resin compsn. showing a good laminatability and a sufficient adhesion to various resin films by compounding a polyurethane resin with a specific modified polyolefin. CONSTITUTION:A polyurethane resin is compounded with a polyolefin modified with an unsatd. dicarboxylic acid and/or a deriv. thereof (e.g. maleic anhydride or butyl maleate), a pref. polyolefin being a propylene polymer or a propylene-alpha- olefin copolymer. The resulting compsn., offering an excellent adhesion to various plastics, can be used as a primer or coating compsn. for an automotive interior or exterior part and also suitably used as a binder resin of a printing ink.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a resin composition and an ink composition.

In particular, the present invention relates to a resin composition that is used as a binder resin for printing ink compositions for plastic films, sheets, or molded articles, and to ink compositions using this as the main binder resin.

[Prior art] In recent years, with the diversification and high functionality of packaging materials, furniture, home appliances, automobile interior and exterior parts, etc., plastic films, sheets, or molded products are used to improve their design or to protect their surfaces. More advanced performance is also required for coating materials such as printing inks and various coating agents. In particular, in the production of packaging materials called flexible packages, which are based on plastic films such as polyester film (PET), nylon film (NY), or stretched polypropylene film (0PP), the packaging materials have heat sealability and airtightness. In order to improve functionality such as properties, polyethylene film or unstretched polypropylene film is usually laminated by dry lamination or extrusion lamination after printing on the film base material using methods such as gravure printing or flexographic printing. . In particular, in extrusion lamination processing in which the material is coated with molten polyethylene or polypropylene, an anchor coating agent (AC agent) mainly composed of polyethyleneimine or polyisocyanate is usually used to provide adhesive strength to the ink layer. However, there is also a processing method (direct lamination) in which lamination is performed directly with molten polypropylene or the like without using an AC agent.

Although the direct lamination method is economically advantageous,
Its suitability is mainly determined by the binder resin used in the printing ink.

The binder resin used in printing ink is PE.
Polyurethane resins are commonly used that have a wide range of adhesion properties to T, NY, OPP, and other base films. In addition, chlorinated polyolefins such as chlorinated polypropylene are used as those having direct lamination suitability.

[Problems to be solved by the invention] However, printing inks using polyurethane resin as a binder have insufficient suitability for lamination, especially direct lamination, while inks using chlorinated polyolefin as a binder are not suitable for OPP. Although it adheres well, it has insufficient adhesion to PET, NY, etc., so there is a problem that the base films that can be used are limited.

[Means for Solving the Problems] As a result of intensive studies by the present inventors on resin compositions and ink compositions that have good lamination suitability and sufficient adhesion to various plastic films, the present inventors have found that:
We have arrived at the present invention.

That is, the present invention provides a resin composition comprising a polyurethane resin (A) and a modified polyolefin (B) modified with an unsaturated dicarboxylic acid and/or a derivative thereof, and a binder resin based on this resin composition.

This is a printing ink composition.

Examples of the polyurethane resin (A) in the present invention include polyurethane resins made from polyol (a) and polyisocyanate (b). Polyols (a) include polyether diols and polyester diols. Examples of polyether diols include low molecular weight glycols [ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, l, 4-
and 1,3-butanediol, neopentyl glycol, 3-methylbentanediol,! , 6-hexanediol, ■, 8-octamethylene diol, alkyl dialkanolamine: low molecular weight diols that grow cyclic groups [
For example, those listed in Japanese Patent Publication No. 45-1474: bis(hydroxymethyl)cyclohexane, p-xylylene glycol, bis(hydroxyethylbenzene, 1
．． 4-bis(2-hydroxyethoxy)benzene, 4.
4-bis(2-hydroxyethoxy)-diphenylpropane (ethylene oxide adduct of bisenol A), etc.]
and mixtures of two or more thereof] (alkylene oxides having 2 to 4 carbon atoms: ethylene oxide, propylene oxide, 1.2-12.3-11.
3-11.4-butylene oxide, etc.) adducts, and ring-opening polymerization or ring-opening copolymerization (block and/or random) products of alkylene oxide; for example, polyethylene glycol, polypropylene glycol, polyethylene-polypropylene (block and/or random) ) glycol,
Polytetramethylene ether glycol, polytetramethylene-ethylene (block and/or random) glycol, polytetramethylene-propylene (block and/or random) glycol, polyhexamethylene ether glycol, polyoctamethylene ether glycol, and these two Mixtures of more than one species are included. Preferred among these are polytettremethylene ether glycol and polyte-1-ramethylene-propylene (random) glycol.

Polyester diols include condensed polyester diols obtained by reacting low-molecular-weight diols and/or polyether diols with a molecular weight of 1000 or less with dicarboxylic acids, and polylactone diols obtained by ring-opening polymerization of lactones.

Examples of the low molecular weight diols include ethylene glycol diethylene glycol, propylene glycol, dipropylene glycol, 1, 3- and 1. Dobutanediol, neopentyl glycol, 3-methylbentanediol, l
, 6-hexanediol, 1.8-t nonanediol,
1,9-nonanediol, alkyl dialkanolamine; low-molecular-weight diols having a cyclic group [e.g., those described in Japanese Patent Publication No. 45-1474: bis(hydroxymethyl)cyclohexane, p- and p-xylylene glycol, bis (Hydroxyethyl)benzene! , 4-bis(
2-hydroxyethoxy)benzene, 4,4'-bis(
Examples include 2-hydroxyethoxy)-diphenylpropane (ethylene oxide adduct of bisphenol A) and mixtures of two or more thereof. molecule ff1100
Examples of the polyether diol of 0 or less include the aforementioned polyether diols such as polyethylene glycol, polytetramethylene ether glycol, polypropylene glycol, triethylene glycol: and mixtures of two or more thereof. Dicarboxylic acids include aliphatic dicarboxylic acids (succinic acid, adipic acid, sebacic acid, glutaric acid, azelaic acid, maleic acid, fumaric acid, etc.), aromatic dicarboxylic acids (terephthalic acid, isophthalic acid, etc.), and two types thereof. Mixtures of the above may be mentioned.

Examples of lactones include ε-caprolactone and γ-valerolactone. Polyester diols can be prepared using conventional methods, such as low molecular weight diols and/or polyester diols with a molecular weight of 1000.
The following polyether diols are combined with dicarboxylic acids or their ester-forming derivatives [for example, anhydrides (maleic anhydride, phthalic anhydride, etc.), lower esters (dimethyl terephthalate, etc.), halides, etc.], or their anhydrides and alkylene reacting (condensing) with an oxide (e.g. ethylene oxide and/or propylene oxide);
Alternatively, an initiator (low molecular diol and/or molecular weight to
It can be produced by adding a lactone to a polyether diol (polyether diol of 0 or less).

Specific examples of these polyester diols include polyethylene adipate, polybutylene adipate, polyhexamethylene adipate, polyneopentyl adipate, poly-3-methylpentane adipate, polyethylene propylene adipate, polyethylene butylene adipate, polybutylene hexamethylene adipate, Polydiethylene adipate, poly(polytetramethylene ether) adipate, polyethylene azelate, polyethylene sebacate, polybutylene azelate, polybutylene sebacate, polycaprolactone diol, polyvalerolactone diol: and mixtures of two or more thereof. It will be done. Among these, preferred are polybutylene adipate, poly-3-methylpentane adipate, polyethylene butylene adipate and polycaprolactone diol.

The average molecular weight (by hydroxyl value measurement) of these polymeric diols is usually 200 to 5 aoo, preferably 30
It is 0-4000.

When producing the polyurethane resin (A), a low-molecular polyfunctional active hydrogen compound may be used as a chain extender (c) if necessary.

Examples of low-molecular polyfunctional active hydrogen compounds include low-molecular glycols and their alkylene oxide low molar adducts (molecular weight 20
0 and 711), aliphatic diamines (ethylene diamine, hexamethylene diamine, etc.), alicyclic diamines (isophorone diamine, 4,4'-dicyclohexylmethane diamine, etc.), aromatic diamines (4,4'-diaminodiphenylmethane, etc.), Examples include aromatic aliphatic diamines (such as xylene diamine), alkanol diamines (such as ethanol ethylene diamine), hydrazine, dihydrazides (such as adipic acid dihydrazide), and mixtures of two or more thereof. Among these, the preferred one is
These include low molecular weight glycols, alicyclic diamines, and mixtures of two or more thereof.

Furthermore, if necessary, as a polymerization terminator (d), 11fI low molecular weight alcohol (methanol, butanol, cyclohexanol, etc.), monovalent alkylamine (mono- and di-methylamine, mono- and di-butylamine, etc.)
, alkanolamines (such as alcohol and di-ethanolamine), and the like may also be used.

The polyisocyanate (b) is an aliphatic polyisocyanate having 2 to 12 carbon atoms (excluding carbon in the NCO group);
Alicyclic polyisocyanate having 4 to 15 carbon atoms, 8 carbon atoms
~12 araliphatic polyisocyanate, carbon number 6-2
0 aromatic polyisocyanates and modified products of these polyisocyanates (such as modified products containing carposiimide groups, uretdione groups, uretdione groups, urea groups, biuret groups and/or incyanurate groups) can be used. Such polyisocyanates include ethylene diisocyanate, tetramethylene diisocyanate,
Hexamethylene diisocyanate (+101), dodecamethylene diisocyanate, I, 6. II-undecane triisocyanate, 2,2.4-)limethylhexane diisocyanate, lysine diisocyanate, 2. Triisocyanatomethyl caproate, bis(2-isocyanatoethyl) fumarate, bis(2-incyanatoethyl) carbonate, 2-incyanatoethyl-2,6-
Cyincyanatohexanoate; Isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (hydrogenated MDI), cyclohexylene diisocyanate, methylcyclohexylene diisocyanate (
Hydrogenated TDI), bis(2-isocyanatoethyl)4-cyclohexene-1,2-dicarboxylate: xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate) (TNXDI), diethylbenzene diisocyanate; aqueous solution of HDI compounds, trimerized products of the former IP, etc.: Tolylene diisocyanate (TDI
), m! ! ! Examples include TDI, diphenylmethane diisocyanate (MDI), polyphenylmethane polyisocyanate (crude MDI), modified MDI (such as carposiimide-modified MDI), naphthylene diisocyanate; and mixtures of two or more thereof. Among these, preferred in terms of solubility are aliphatic diisocyanates,
They are cycloaliphatic diisocyanates and araliphatic diisocyanates.

In the present invention, polyol (a) and polyisocyanate)
(b) and a chain extender (c) used as necessary and/or
Or polyurethane resin [A] with polymerization terminator (d)
When producing the polyol (a), the amount of the low-molecular polyfunctional active hydrogen compound as the chain extender (c) is usually 50% based on the polyol (a).
It is not more than 30% by weight, preferably not more than 30% by weight.

The ratio of the active hydrogen-containing compound consisting of the polyol (a), the chain extender (c) and/or the polymerization terminator (d), and the polyisocyanate (b) is such that the NGO/active hydrogen equivalent is usually 0.8 to 1. .2, preferably 0.9 to 1.1.

In the present invention, the polyurethane resin (A) is produced by reacting a polyol (a), a polyisocyanate (b), and optionally a chain extender (d), and then reacting a polymerization terminator (d) with substantially NGO There are two methods: a method in which the reaction is carried out to the point where no group is included, and a method in which the reaction is carried out at the -group, and either method may be used.

The polyurethane forming reaction is usually carried out at a temperature of 40 to 120°C, preferably 80 to 100°C (however, in the case of reacting a polyamine, the temperature is usually 80°C or lower, preferably 0 to 7°C).
(carried out at a temperature of 0°C).

In order to accelerate the reaction, amine catalysts used in ordinary urethanization reactions, such as triethylamine, toethylmorpholine, triethylenediamine, etc.; tin catalysts, such as dibutyltin dilaurate, dioctyltin dilaurate, etc. can be used.

The polyurethane resin (A) is produced in the presence or absence of a solvent. Solvents used include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, etc.), esters (ethyl acetate, butyl acetate, etc.)
, ethers (tetrahydrofuran, etc.), aromatic hydrocarbons (toluene, xylene, etc.), alcohols (methanol, ethanol, isopropyl alcohol, etc.),
Examples include polyhydric alcohol derivatives (ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, etc.), amides (dimethylformamide, etc.), sulfoxides (dimethyl sulfoxide, etc.), and mixed solvents of two or more of these.

Among these, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate,
These solvents include tetrahydrofuran, toluene, xylene, methanol, ethanol, isopropyl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and mixed solvents of two or more of these.

Examples of the modified polyolefin (B) used in the present invention include those modified with unsaturated dicarboxylic acids and/or derivatives thereof.

Examples of unsaturated dicarboxylic acids used for modification include maleic acid, itaconic acid, citraconic acid, aconitic acid, and anhydrides of these dicarboxylic acids, and one or more of these can be used. Among these, maleic anhydride is preferred. Unsaturated dicarboxylic acid derivatives include unsaturated dicarboxylic acid mono- or diesters such as butyl maleate, dibutyl maleate, butyl itaconate, mono- or diamides of unsaturated dicarboxylic acids, K-phenylmaleimide, N-2 −
Examples include N-phenylmaleimides such as methylphenylmaleimide and N-2-ethylphenylmaleimide, and alkylmaleimides having 2 to 18 carbon atoms such as N-laurylmaleimide, and one or more of them can be used. Among these, preferred are monoesters of unsaturated dicarboxylic acids.

Examples of polyolefins include polyolefins such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, propylene polymers, polybutene, poly-4-methylpentene-11 copolymers of ethylene and α-olefin, or oligomers thereof; propylene rubber,
Ethylene-propylene-diene terpolymer (EPDM)
), ethylene-vinyl acetate copolymer, butyl rubber, butadiene, rubber, low-crystalline ethylene-propylene copolymer, polyolefin thermoplastic elastomers consisting of propylene-butene, or oligomers thereof, polypropylene and ethylene-propylene rubber. Includes polyolefin elastomers such as polyolefin thermoplastic elastomers that are mainly blends, ethylene-vinyl ester copolymers, ethylene-acrylic ester copolymers, and their oligomers, and also includes blends of these various polyolefins and oligomers. It will be done. Among these, preferred are propylene polymers, propylene and α
- It is a copolymer of olefins. These polymers or copolymers may be oligomers.

There is no particular limit to the amount of double bonds in the polyolefin used for modification, but if the number of carbon atoms is 1000 at the terminal and/or within the molecule
It is preferable to have 0.5 or more pieces per piece.

Furthermore, it is preferable to have more than 1.5 molecules only at the ends.

The amount of the unsaturated dicarboxylic acid and/or its derivative used for modification is usually 0.1 to 30% by weight, preferably 2 to 20% by weight, including the weight of the polyolefin before modification. If the amount is 0.1% by weight without grooves, it will be difficult to mix uniformly with the polyurethane resin, and if it exceeds 30% by weight, the fluidity of the mixture will decrease. The molecular weight of the modified polyolefin (B) used in the present invention is not particularly limited, but preferably has a number average molecular weight of 500 to 20,000, particularly preferably 1,000 to 1 sooo.

The modified polyolefin (B) can be obtained by reacting the above unsaturated dicarboxylic acid and/or its derivative with a polyolefin in the presence of an organic peroxide. As the organic peroxide, those generally used as initiators in radical polymerization can be used, and the type thereof is not particularly limited, but those having a half-life of 1 minute or more are preferred. Specifically, ketone peroxides such as 1.1-bis-1-butylperoxy-3,3,5-trimethylcyclohexane, dialkyl peroxides such as di-t-butyl peroxide, dicumyl peroxide, diacyl peroxides, such as benzoyl peroxide,
Examples include peroxy esters such as 2,5-dimethyl-dibenzoyl peroxyhexane, and hydroperoxides such as 2,5-dimethylhexane-2,5-hydroperoxide.

As a method for producing the modified polyolefin (B), any known method such as a solution method or a melt method can be used. In the solution method, polyolefin and the unsaturated dicarboxylic acid and/or
Alternatively, it can be obtained by dissolving a derivative thereof in an organic solvent and heating it in the presence of an organic peroxide. As the organic solvent to be used, a hydrocarbon having 6 to 12 carbon atoms, a halogenated hydrocarbon having 6 to 12 carbon atoms, or the like can be used. In addition, the reaction temperature is the temperature at which the polyolefin used dissolves, and is generally 110 to 180°C.
is preferred.

In the melting method, it can be obtained by mixing the polyolefin and the unsaturated dicarboxylic acid and/or its derivative with an organic peroxide, melt-mixing, and reacting.

The reaction can be carried out in various mixers such as an extruder, Brabender kneader or Banbury mixer. Furthermore, the reaction can be carried out in a normal reaction tank by melting the polyolefin and then adding an organic peroxide thereto. The kneading temperature is above the melting point of the polyolefin used to 30O
A temperature range below 0.degree. C. is preferred.

In the composition of the present invention, the ratio of the polyurethane resin (A) to the modified polyolefin (B) is usually 0.5 to 30 parts by weight based on 100 parts by weight of the polyurethane resin (A). , preferably 2-2
It is 0 parts by weight. If (B) is less than 0.5 parts by weight, the effect of improving direct lamination suitability and the like cannot be obtained, and the fluidity of the mixed solution decreases.

In the production of the resin composition of the present invention, the method of mixing the polyurethane resin (A) and the modified polyolefin (B) is not particularly limited, but for example, a method of heating and melting and mixing in an organic solvent, or a method of mixing using an extruder or a kneader, etc. This can be carried out by heating, melting and kneading using a machine, and then dissolving in an organic solvent.

The resin composition of the present invention has excellent performance as a binder for coating materials such as printing inks or paints for various plastic films, sheets, and molded products.

When using the resin composition of the present invention as an ink binder, it can be used in the same manner as conventional ink binders (eg, polyurethane resins). That is, a printing ink is produced by blending the resin composition of the present invention with a pigment and, if necessary, additives such as other resins, a solvent, and a pigment dispersant, and kneading the mixture using an ordinary ink production apparatus such as a ball mill. and use it. Other resins mentioned above include polyamide, nitrocellulose, polyacrylates, polyvinyl chloride, and copolymers of vinyl chloride and vinyl acetate.
Examples include chlorinated polyolefin, polystyrene, butadiene rubber, and epoxy resin.

An example of the formulation of a printing ink using the resin composition of the present invention is as follows (% indicates weight %).

Resin composition of the present invention (per solid content) 10-20% Pigment 5-40% Other resins 0N10% Solvent
40-75% additives
Appropriate amount The resin composition of the present invention may be used for so-called wave printing inks, but it can also be used in combination with a polyisocyanate curing agent for two-component printing inks. In this case, the polyisocyanate curing agent is, for example, an adduct synthesized from 1 mole of trimethylolpropane and 3 moles of 1,8-hexamethylene diisocyanate, tolylene diisocyanate or isophorone diisocyanate: 1,6-hexamethylene diisocyanate or Incyanurate group-containing trimer synthesized by cyclic trimerization of isocyanate groups of isophorone diisocyanate: partial biuret reaction product synthesized from 1 mole of water and 3 moles of 1,8-hexamethylene diisocyanate, and two or more thereof A mixture of is preferred. When used as a two-component printing ink, the amount of polyisocyanate curing agent added is usually 0.5 to 1 to the ink.
O% by weight.

The printing method using a printing ink using the resin composition of the present invention as a binder may be the same as that for conventional special gravure inks.

[Example] The present invention will be further explained with reference to Examples below, but the present invention is not limited thereto. In Examples, Production Examples, and Comparative Examples, "part" indicates part by weight, and "%" indicates weight %.

Production Example 1 Polybutylene adipate diol (molecule fi2000)
100 parts, poly-3-methylpentane adipate diol (molecules: 12000) 100 parts, 1,4-butanediol 13.4 parts, inphorone diisocyanate 58.1
! , dioctyltin dilaure) and 40 G parts of toluene were charged into a reaction vessel and reacted at 110° C. for 8 hours. Then, after cooling to 70°C, 714 parts of monoethanolamine was added and stirred for an additional hour to complete the reaction, resulting in a polyurethane resin solution (A-1) with a solid content of 40% and a viscosity of 45*°C/25°C. Obtained.

Production example 2 Polybutylene adipate diol (molecular weight 2000) 2
00 parts, neopentyl glycol 7.2 parts, inphorone diisocyanate 48.3 parts and dioctyltin dilaurate 0.05 parts were charged into a reaction vessel and reacted at 100°C for 8 hours to produce a urethane prepolymer with N00% of 1.55. I got it. Next, 385 parts of toluene was added and dissolved uniformly, and then a mixture consisting of 7.0 parts of isophoronediamine and 10 parts of isopropanol was added to the toluene solution of the urethane prepolymer and reacted at 50° C. for 3 hours. The obtained polyurethane resin solution (A-2) had a solid content of 40%,
The viscosity was 521' (°C/25°C), and the total 7 min value was 2.3 (based on resin solid content).

Production Example 3 10 parts of maleic anhydride and polypropylene (molecular weight 400
0, containing 5.2 terminal double bonds per 1000 carbon atoms) was dissolved in xylene, and after reacting at 140°C for 3 hours in the presence of dicumyl peroxide, the xylene was distilled off and anhydrous Modified polypropylene with a maleic acid content of 9.5% (
B-1) was obtained.

Production Example 4 13 parts of maleic anhydride and polypropylene (molecule N3α0
Maleic anhydride-modified polypropyne was produced by reacting 87 parts of 8.2 terminal double bonds per 1000 carbon atoms in the same manner as in Production Example-3, and further n-butanol 3 After adding .8 parts and reacting, xylene was distilled off to obtain modified polypropylene (B-2).

Examples 1 to 4 Polyurethane resins A-1 or A-2 obtained in Production Examples 1 to 4 and modified polypropylene B-1 or B-2 were added using a kneader in the proportions shown in Table 1. Pressure 140
C. to obtain a resin solution with a transparent or translucent appearance. Next, printing ink was prepared using this resin solution as a binder solution with the following formulation.

Binder solution 50 parts Pigment (titanium white) 40 parts Toluene
30 part MEK
30 parts Ceramic balls 100 parts Total 250 parts Put the above materials into a steel can with an internal volume of 500a + 1.
1 with paint conditioner (manufactured by Red Devil)
The ink was prepared by kneading for hours. Using the obtained printing ink, a polyester film (P
ET), nylon film (NY) and oriented polypropylene film (OPP). The following performance tests were conducted on the obtained printed matter.

The results are shown in Table-1.

Comparative Example 1.2 Ink preparation, printing, and performance tests were conducted in the same manner as in Examples 1 to 4, except that only polyurethane resins (A-1 and A-2) were used as the binder resin. The results are shown in Table-1.

(Performance test items and test methods) (1) Adhesive Nichiban Sellotape (12 mm width) is applied to the printed surface, and one end of the Nichiban Sellotape is rapidly peeled off in the direction perpendicular to the printed surface. I observed the condition.

(2) Blocking resistance Printed and non-printed surfaces are overlapped at a temperature of 40°C and a humidity of BO%.
A load of 1.0 kg/c/ was applied in RH, and after 24 hours, it was peeled off and the surface condition was observed.

(3) Oil resistance After immersing the printed matter in rapeseed oil at 25° C. for 24 hours, the surface condition was observed.

(4) For printed matter of OPP suitable for direct lamination, molten polypropylene is directly laminated using an extrusion laminating machine, and after 3 days, T
Peel strength was measured.

The criteria for each test result are: ◎Very good, ◯Good, Δ: Slightly poor, and X: Poor.

Table - [Effects of the Invention] The resin composition of the present invention is useful as a binder resin for printing inks, and ink compositions using this resin composition can be used in a wide variety of applications, particularly polyolefin films, polyester films, nylon films, etc. Because it has excellent properties such as good adhesion to plastic films and suitability for direct lamination, it is possible to design inks for a wider range of purposes than conventional binder resins.

Furthermore, since the resin composition of the present invention has excellent adhesion to various plastics, it can be applied as a paint brusher or paint for all plastic molded products, such as interior and exterior parts of automobiles.

Claims (1)

[Claims] 1. Modified polyolefin modified with polyurethane resin (A) and unsaturated dicarboxylic acid and/or derivative thereof (
A resin composition consisting of B). 2. The number average molecular weight of the modified polyolefin (B) is 500
The resin composition according to claim 1, which has a molecular weight of 20,000 to 20,000. 3. The modified polyolefin (B) contains an unsaturated dicarboxylic acid and/or its derivative from 0.1 to the polyolefin.
The resin composition according to claim 1 or 2, which is modified by 30% by weight. 4. The resin composition according to any one of claims 1 to 3, wherein the polyolefin of the modified polyolefin (B) is a propylene polymer or a copolymer of propylene and α-olefin. 5. Claims 1 to 1 consisting of 100 parts by weight of polyurethane resin (A) and 0.5 to 30 parts by weight of modified polyolefin (B)
4. The resin composition according to any one of 4. 6. A printing ink composition for plastic films, sheets, or molded products, comprising the resin composition according to any one of claims 1 to 5 as a main binder resin.