JP3044353B2 - Resin composition and ink composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a resin composition and an ink composition. In particular, the present invention relates to a resin composition useful as a binder resin for a printing ink composition of a plastic film, sheet, or molded article, and an ink composition using the same as a main binder resin.

[Prior art] In recent years, with the diversification and high functionality of packaging materials, furniture, home appliances or interior and exterior parts of automobiles, they are used for improving the design of plastic films, sheets or molded products or for protecting the surface. Higher performance is also required for printing inks and coating agents such as various coating agents. Above all, 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 (OPP), heat-sealing and airtight In order to improve the functional properties such as gravure printing or flexographic printing on the film substrate, dry lamination or extrusion lamination, polyethylene film,
It is common practice to laminate an unstretched polypropylene film. In particular, in the extrusion lamination processing for coating with molten polyethylene or polypropylene, an anchor coating agent (AC agent) mainly composed of polyethyleneimine or polyisocyanate is usually used for the purpose of imparting adhesive strength to the ink layer. However, a processing method of directly laminating with a molten polypropylene or the like without using an AC agent (direct lamination) is also performed. Although the direct lamination method is economically advantageous, its suitability mainly depends on the binder resin used for the printing ink.

The binder resin used for printing inks is PE
Polyurethane resins having a wide range of adhesion to T, NY, OPP and other base films are generally used. In addition, those having direct lamination suitability include:
Chlorinated polyolefins such as chlorinated polypropylene have been used.

[Problems to be Solved by the Invention] However, printing ink using a polyurethane resin as a binder is insufficient in suitability for laminating, especially direct laminating, whereas ink using a chlorinated polyolefin as a binder is not suitable for OPP. Good adhesion, but poor adhesion to PET, NY, etc.
There is a problem that usable base films are limited.

[Means for Solving the Problems] The present inventors have conducted intensive studies on resin compositions and ink compositions having good suitability for lamination and having sufficient adhesion to various plastic films. The invention has been reached.

That is, according to the present invention, the polyurethane resin (A), the polyurethane resin (A), and the terminal double bond amount are 1000 carbon atoms.
A resin composition comprising a modified polyolefin (B) having a number average molecular weight of from 500 to 20,000 obtained by modifying more than 1.5 polyolefins with a saturated dicarboxylic acid and / or a derivative thereof; suitable for direct lamination comprising the resin composition A printing ink binder comprising the resin composition; and a printing ink composition comprising the resin composition as a main binder resin.

As the polyurethane resin (A) in the present invention, a polyurethane resin from a polyol (a) and a polyisocyanate (b) can be mentioned. Polyol (a) includes polyether diol and polyester diol. Polyether diols include low molecular weight glycols [ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-
And 1,3-butanediol, neopentyl glycol,
3-methylpentanediol, 1,6-hexanediol, 1,8-octamethylenediol, alkyl dialkanolamine; low molecular weight diols having a cyclic group [for example, those described in JP-B-45-1474: bis (hydroxymethyl ) Cyclohexane, m- and p-xylylene glycol, bis (hydroxyethylbenzene, 1,4-bis (2
-Hydroxyethoxy) benzene, 4,4'-bis (2-
Hydroxyethoxy) -diphenylpropane (ethylene oxide adduct of bisenol A) and the like;
Or a mixture of two or more kinds thereof]
4, alkylene oxide: ethylene oxide, propylene oxide, 1,2-, 2,3-, 1,3-, 1,4-butylene oxide) adduct, and alkylene oxide ring-opening polymerization or ring-opening copolymerization (block And / or random); 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) glycols, polyhexamethylene ether glycol, polyoctamethylene ether glycol and mixtures of two or more thereof. Preferred among these are polytetramethylene ether glycol and polytetramethylene-propylene (random) glycol.

Polyester diols include low molecular weight diols and / or condensed polyester diols obtained by reacting polyether diols having 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 diol include ethylene glycol diethylene glycol, propylene glycol, dipropylene glycol, 1,3- and 1,4-butanediol, neopentyl glycol, 3-methylpentanediol, 1,6-hexanediol, and 1,8- Octanediol, 1,9-nonanediol, alkyl dialkanolamine; low molecular weight diols having a cyclic group [for example, those described in JP-B No. 45-1474: bis (hydroxymethyl) cyclohexane, m- and p-xylylene Glycol, bis (hydroxyethyl) benzene, 1,4-bis (2-hydroxyethoxy) benzene, 4,4'-bis (2-hydroxyethoxy) -diphenylpropane (ethylene oxide adduct of bisphenol A) and the like Mixtures of two or more are mentioned. Examples of the polyether diol having a molecular weight of 1,000 or less include the polyether diols such as polyethylene glycol, polytetramethylene ether glycol, polypropylene glycol,
Triethylene glycol; and a mixture of two or more thereof. Examples of dicarboxylic acids include aliphatic dicarboxylic acids (succinic acid, adipic acid, sebacic acid, glutaric acid, azelaic acid, maleic acid, fumaric acid, etc.) and aromatic dicarboxylic acids (terephthalic acid, isophthalic acid, etc.).
And mixtures of two or more of these. Examples of the lactone include ε-caprolactone and γ-valerolactone. Polyester diols can be prepared in a conventional manner, for example, by adding a low molecular weight diol and / or a polyether diol having a molecular weight of 1,000 or less to a dicarboxylic acid or an ester-forming derivative thereof [eg, anhydrides (maleic anhydride, phthalic anhydride, etc.), lower esters (terephthalic anhydride). Dimethyl acid), halides, etc.), or an anhydride thereof and an alkylene oxide (eg, ethylene oxide and / or propylene oxide), or an initiator (low molecular weight diol and / or polyether having a molecular weight of 1000 or less) Diol) with a lactone.

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, poly Diethylene adipate, poly (polytetramethylene ether) adipate, polyethylene azelate, polyethylene sebacate, polybutylene azelate, polybutylene sebacate, polycaprolactone diol, polyvalerolactone diol; and a mixture of two or more of these. . Preferred among these are polybutylene adipate, poly-3-methylpentane adipate, polyethylene butylene adipate and polycaprolactone diol.

The average molecular weight (as measured by hydroxyl value) of these high molecular weight diols is usually from 200 to 5,000, preferably from 300 to 4,000.

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

As the low molecular weight polyfunctional active hydrogen compound, for example, the low molecular weight glycol mentioned as a raw material of the polyester diol and a low molar addition product of an alkylene oxide thereof (molecular weight: 20)
0), aliphatic diamine (ethylenediamine, hexamethylenediamine, etc.), alicyclic diamine (isophoronediamine, 4,4'-dicyclohexylmethanediamine, etc.), aromatic diamine (4,4'-diaminodiphenylmethane, etc.), aromatic Examples include aliphatic diamines (such as xylene diamine), alkanol diamines (such as ethanol ethylene diamine), hydrazine, dihydrazide (such as adipic dihydrazide), and mixtures of two or more of these. Of these, preferred are low molecular weight glycols, alicyclic diamines and mixtures of two or more of these.

If necessary, a monohydric low molecular alcohol (such as methanol, butanol, or cyclohexanol) or a monovalent alkylamine (mono- or di-) may be used as a polymerization terminator (d).
Methylamine, mono- and di-butylamines, etc., alkanolamines (mono- and di-ethanolamines, etc.) may be used.

Examples of the polyisocyanate (b) include aliphatic polyisocyanates having 2 to 12 carbon atoms (excluding carbon in the NCO group), alicyclic polyisocyanates having 4 to 15 carbon atoms, and 8 to 8 carbon atoms.
12 aromatic aliphatic polyisocyanates, aromatic polyisocyanates having 6 to 20 carbon atoms and modified products of these polyisocyanates (carbodiimide group, uretdione group, uretoimine group, urea group, buret group and / or isocyanurate group-containing modified) Object etc.) can be used.
Such polyisocyanates include ethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), dodecamethylene diisocyanate, 1,6,11-undecane triisocyanate, 2,2,4-trimethylhexane diisocyanate, lysine diisocyanate, 6-diisocyanatomethylcaproate, bis (2-isocyanatoethyl) fumarate, bis (2-isocyanatoethyl) carbonate, 2
-Isocyanatoethyl-2,6-diisocyanatohexanoate; isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (hydrogenated MDI), cyclohexylene diisocyanate, methylcyclohexylene diisocyanate (hydrogenated TDI), bis (2-isocyanate) Natoethyl) 4-cyclohexene-1,2-dicarboxylate; xylylene diisocyanate (XDI), tetramethyl xylylene diisocyanate (TMXDI), diethylbenzene diisocyanate; water-modified HDI, trimerized IPDI, etc .; tolylene diisocyanate (TDI), crude T
DI, diphenylmethane diisocyanate (MDI), polyphenylmethane polyisocyanate (crude MDI), modified M
DI (such as carbodiimide-modified MDI), naphthylene diisocyanate; and a mixture of two or more of these. Among these, aliphatic diisocyanates, alicyclic diisocyanates and araliphatic diisocyanates are preferred in terms of solubility.

In the present invention, the polyol (a), the polyisocyanate (b), and the chain extender (c) and / or
Alternatively, a polyurethane resin (A) is obtained from the polymerization terminator (d).
When producing the compound (A), the amount of the low molecular weight polyfunctional active hydrogen compound as the chain extender (c) is usually 50% by weight or less, preferably 30% by weight or less based on the polyol (a).

The ratio of the active hydrogen-containing compound comprising the polyol (a) and the chain extender (c) and / or the polymerization terminator (d) to the polyisocyanate (b) is usually NCO / active hydrogen equivalent.
0.8 to 1.2, preferably 0.9 to 1.1.

In the production of the polyurethane resin (A) in the present invention, the polyol (a), the polyisocyanate (b) and, if necessary, the chain extender (d) are reacted, and then the polymerization terminator (d)
And a method of reacting all at once to a point substantially not containing an NCO group. Either method may be used.

The polyurethane-forming reaction is usually carried out at 40 to 120 ° C, preferably at 6 ° C.
The reaction is carried out at a temperature of 0 to 100 ° C (however, when a polyamine is reacted, the reaction is usually carried out at a temperature of 80 ° C or lower, preferably at a temperature of 0 to 70 ° C).

To promote the reaction, an amine-based catalyst used in a usual urethane reaction, for example, triethylamine,
N-ethylmorpholine, triethylenediamine and the like; tin-based catalysts such as dibutyltin dilaurate and dioctyltin dilaurate can be used.

The production of the polyurethane resin (A) is performed 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.), polyhydric alcohol derivatives (ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, etc.), amides (dimethyl formamide, etc.) sulfoxides (dimethyl sulfoxide, etc.) and mixed solvents of two or more of these. Can be Of these, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, tetrahydrofuran, toluene, xylene, methanol, ethanol,
Isopropylene alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and a mixed solvent of two or more thereof.

Examples of the modified polyolefin (B) used in the present invention include those modified with an unsaturated dicarboxylic acid and / or a derivative thereof.

Examples of the unsaturated dicarboxylic acid used for the modification include maleic acid, itaconic acid, citraconic acid, aconitic acid, and anhydrides of these dicarboxylic acids, and one or more kinds thereof can be used. Of these, maleic anhydride is preferred. Derivatives of unsaturated dicarboxylic acids include mono- or diesters of unsaturated dicarboxylic acids such as butyl maleate, dibutyl maleate and butyl itaconate, or mono- or diamides of unsaturated dicarboxylic acids, N-phenylmaleimide, N-2
Examples thereof 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 kinds thereof can be used. Of these, preferred are monoesters of unsaturated dicarboxylic acids.

Examples of the polyolefin include polyolefins such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, propylene polymer, polybutene, poly-4-methylpentene-1, and a copolymer of ethylene and α-olefin, or oligomers thereof; -Propylene rubber, ethylene-propylene-diene terpolymer (EPD
M), ethylene-vinyl acetate copolymer, butyl rubber, butadiene rubber, low crystalline ethylene-propylene copolymer, polyolefin-based thermoplastic elastomers comprising propylene-butene, or oligomers thereof, and polypropylene and ethylene-propylene rubber. Including polyolefin-based elastomers such as polyolefin-based thermoplastic elastomers based on blends, ethylene-vinyl ester copolymers, ethylene-acryl ester copolymers and oligomers thereof, and also includes blends of these various polyolefins and oligomers It is. Among these, preferred are a propylene polymer and a copolymer of propylene and an α-olefin. These polymers or copolymers may be oligomers.

As the polyolefin used for the modification, those having a terminal double bond amount of more than 1.5 per 1000 carbon atoms are used.

The amount of the unsaturated dicarboxylic acid and / or derivative thereof used for the modification is usually 0.1 to 30% by weight, preferably 2 to 20% by weight based on the weight of the polyolefin before the modification. 0.1
If the amount is less than 30% by weight, it is difficult to uniformly mix with the polyurethane resin. If the amount exceeds 30% by weight, the fluidity of the mixture is reduced. Modified polyolefin (B) used in the present invention
Number average molecular weight of 500 to 20000, preferably 1000 to 15000
It is.

The modified polyolefin (B) is obtained by reacting the above-mentioned unsaturated dicarboxylic acid and / or derivative thereof with a polyolefin in the presence of an organic peroxide. As the organic peroxide, those generally used as an initiator in radical polymerization can be used, and the kind thereof is not particularly limited, but those having a one-minute half-life of 100 ° C. or more are preferable. Specifically, ketone peroxides such as 1,1-bis-1-butylperoxy-3,3,5-trimethylcyclohexane, di-t-butyl peroxide, dialkyl peroxides such as dicumyl peroxide, Diacyl peroxides such as benzoyl peroxide, 2,5-
Examples include peroxyesters such as dimethyl-dibenzoyl peroxidehexane, and hydroperoxides such as 2,5-dimethylhexane-2,5-hydroperoxide.

As a method for producing the modified polyolefin (B), a solution method,
Any known method can be used for the melting method. In the solution method, it can be obtained by dissolving a polyolefin and the unsaturated dicarboxylic acid and / or a derivative thereof in an organic solvent and heating 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. The reaction temperature is a temperature at which the polyolefin to be used is dissolved, and generally 110 to 160 ° C is preferable.

In the melting method, it can be obtained by mixing a polyolefin, the unsaturated dicarboxylic acid and / or a derivative thereof with an organic peroxide, melt-mixing and reacting.
The reaction can be carried out using various mixers such as an extruder, a Brabender, a kneader or a Banbury mixer. Further, in a usual reaction vessel, the reaction can be carried out by adding an organic peroxide after melting the polyolefin. The kneading temperature is from the melting point of the polyolefin used to 300 or more.
A temperature range of less than or equal to ° 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 of the modified polyolefin (B) per 100 parts by weight of the polyurethane resin (A), and is preferably Is from 2 to 20 parts by weight. When the content of (B) is less than 0.5 part by weight, no improvement effect such as suitability for direct lamination is obtained, and the fluidity of the mixed solution is reduced.

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. For example, a method of mixing by heating and dissolving in an organic solvent or a mixing machine such as an extruder or a kneader. And then melted and kneaded by using a method of dissolving in an organic solvent.

The resin composition of the present invention has excellent performance as a binder for a coating agent such as a printing ink or a coating agent for various plastic films, sheets or molded articles.

When the resin composition of the present invention is used as an ink binder, it can be used in the same manner as a conventional ink binder (for example, a polyurethane resin). That is, a printing ink is produced by blending the resin composition of the present invention with pigments and other resins as necessary, additives such as a solvent and a pigment dispersant, and kneading them using a normal ink production apparatus such as a ball mill. To use. As the other resins, polyamide, nitrocellulose, polyacrylates,
Examples include polyvinyl chloride, a copolymer of vinyl chloride and vinyl acetate, chlorinated polyolefin, polystyrene, butadiene rubber, and epoxy resin.

Examples of the formulation of the printing ink using the resin composition of the present invention are as follows (% indicates% by weight).

Resin composition of the present invention (per solid) 10 to 20% Pigment 5 to 40% Other resins 0 to 10% Solvent 40 to 75% Additive appropriate amount The resin composition of the present invention is a so-called one-pack type. Although it may be used for printing inks, it can also be used for two-pack printing inks in combination with a polyisocyanate-based curing agent. In this case, the polyisocyanate-based curing agent includes, for example, an adduct synthesized from 1 mol of trimethylolpropane and 3 mol of 1,6-hexamethylene diisocyanate, tolylene diisocyanate or isophorone diisocyanate; 1,6-hexamethylene diisocyanate or isophorone diisocyanate An isocyanurate group-containing trimer synthesized by cyclotrimerization of an isocyanate group of the following: a partially buret reactant synthesized from 1 mol of water and 3 mol of 1,6-hexamethylene diisocyanate; and a mixture of two or more of these. It is suitable. When used as a two-part printing ink, the amount of the polyisocyanate-based curing agent is usually 0.5 to 10% by weight based on the ink.

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

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

Production Example 1 Polybutylene adipate diol (molecular weight 2000) 100
Parts, 100 parts of poly-3-methylpentane adipate diol (molecular weight: 2000), 13.4 parts of 1,4-butanediol, 56.1 parts of isophorone diisocyanate, 0.05 part of dioctyltin dilaurate and 406 parts of toluene were charged into a reaction vessel.
The reaction was performed at 8 ° C. for 8 hours. Then, after cooling to 70 ° C, 1.6 parts of monoethanolamine was added and the mixture was further stirred for 1 hour to complete the reaction, thereby obtaining a polyurethane resin solution (A-1) having a solid content of 40% and a viscosity of 45 poise / 25 ° C.

Production Example 2 Polybutylene adipate diol (molecular weight 2000) 200
Parts, neopentyl glycol 7.2 parts, isophorone diisocyanate 48.3 parts and dioctyltin dilaurate 0.05
Part was charged into a reaction vessel and reacted at 100 ° C for 8 hours.
Of 1.55 was obtained. Then toluene 38
After adding 5 parts and dissolving uniformly, isophorone diamine 7.0
Of a mixture consisting of 1 part of isopropanol and 10 parts of isopropanol was added to a toluene solution of the urethane prepolymer, and reacted at 50 ° C. for 3 hours. Obtained polyurethane resin solution (A-2)
Was 40% solids, viscosity 52 poise / 25 ° C., and total amine value 2.3 (in terms of resin solids).

Production Example 3 10 parts of maleic anhydride and 90 parts of polypropylene (“Viscol 550P” manufactured by Sanyo Chemical Industries, having a molecular weight of 4,000 and a terminal double bond of 5.2 per 1000 carbon atoms) were dissolved in xylene, and dicumyl peroxide was dissolved in xylene. After the reaction at 140 ° C. for 3 hours in the presence of water, xylene was distilled off, and the maleic anhydride content was 9.5%.
Of modified polypropylene (B-1).

Production Example 4 A method similar to that of Production Example-3 using 13 parts of maleic anhydride and 87 parts of polypropylene ("Viscol 660P" manufactured by Sanyo Chemical Industries, having a molecular weight of 3,000 and a terminal double bond of 6.2 parts per 1,000 carbon atoms). To produce a maleic anhydride-modified polypropylene, and 3.8 parts of n-butanol was further added to react the mixture.
-2) was obtained.

Examples 1 to 4 The polyurethane resin A-1 or A-2 and the modified polypropylene B-1 or B-2 obtained in Production Examples 1 to 4 were pressed under pressure using a kneader at the ratios shown in Table 1. 140
The mixture was kneaded at ℃ to obtain a resin solution having a transparent or translucent appearance. Next, a printing ink was prepared with the following composition using this resin solution as a binder solution.

Binder solution 50 parts Pigment (titanium white) 40 parts (Ishihara Sangyo “Taipaek CR-901”) Toluene 30 parts MEK 30 parts Ceramic balls 100 parts (diameter of about 7 to 10 mm) Total 250 parts The ink was placed in a steel can and kneaded for 1 hour with a paint conditioner (manufactured by Red Devil Co., Ltd.) to prepare an ink. Using the obtained printing ink, polyester film (PET) with a gravure proofing machine,
Printed on nylon film (NY) and oriented polypropylene film (OPP). The following performance tests were performed on the obtained printed matter.

 Table 1 shows the results.

Polyurethane resin only as binder resin (A-1
Preparation of ink, printing and performance test were performed in the same manner as in Examples 1 to 4, except that A-2) and A-2) were used. Table 1 shows the results.

(Performance test items and test methods) (1) Adhesive property Nichiban cello tape (12 mm width) is applied to the printing surface, and one end of the Nichiban cello tape is rapidly peeled off at right angles to the printing surface. The condition was observed.

(2) Blocking resistance The printing surface and the non-printing surface are overlapped, and the temperature is 40 ° C and the humidity is 60% RH.
Among them, a load of 1.0 kg / cm ² was applied, and after 24 hours, it was peeled off and the state of the surface was observed.

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

(4) Suitability for direct lamination For the printed matter of OPP, the extruded laminating machine is used to directly laminate the molten polypropylene, and after 3 days,
The T peel strength was measured.

 The criterion of each test result is 極 め て very good, 良好 good, △ slightly poor, and × bad.

[Effects of the Invention] The resin composition of the present invention is useful as a binder resin for printing ink, and the ink composition using this resin composition is particularly suitable for a wide range of plastic films such as polyolefin films, polyester films, and nylon films. Since it has excellent properties such as good adhesiveness to, for example, and suitability for direct lamination processing, it is possible to design inks in accordance with a wide range of usage purposes compared to conventional binder resins.

Further, since the resin composition of the present invention has excellent adhesiveness to various plastics, it can be applied as a coating primer or paint for various plastic molded products, for example, interior and exterior parts of automobiles.

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Claims (7)

(57) [Claims] 1. A polyurethane resin (A) and a polyolefin having a terminal double bond amount of more than 1.5 per 1,000 carbon atoms modified with an unsaturated dicarboxylic acid and / or a derivative thereof to have a number average molecular weight of 500 to 500. A resin composition comprising 20000 modified polyolefin (B). 2. A modified polyolefin (B) wherein the polyolefin is unsaturated dicarboxylic acid and / or a derivative thereof.
The resin composition according to claim 1, which is modified at 0.1 to 30% by weight. 3. The resin composition according to claim 1, wherein the polyolefin of the modified polyolefin (B) is a propylene polymer or a copolymer of propylene and an α-olefin. 4. The composition according to claim 1, comprising 100 parts by weight of the polyurethane resin (A) and 0.5 to 30 parts by weight of the modified polyolefin (B).
4. The resin composition according to any one of items 1 to 3. 5. A direct laminating suitability-imparting agent comprising the resin composition according to claim 4. 6. A printing ink binder comprising the resin composition according to claim 1. 7. A plastic film comprising the resin composition according to claim 1 as a main binder resin,
Printing ink compositions for sheets or molded articles.