JP2577804B2 - Non-aqueous dispersion type resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a non-aqueous dispersion type resin composition having excellent storage stability and pigment dispersibility.

(Prior Art) Conventionally, various non-aqueous dispersion type resin compositions have been known. These are widely used for paints, coatings, adhesives, adhesives, and the like. Behind this, as a flow of the entire paint, the solvent content in the composition is reduced from the viewpoint of resource saving, and the solid content is increased. There is a non-aqueous dispersion paint which can be made into a solid by using an aliphatic solvent as a solvent rather than using a large amount of highly toxic aromatic or ester.

As the dispersion stabilizers conventionally used in these, specifically, (1) an ethylenically unsaturated monomer such as an alkyl ester of acrylic acid or methacrylic acid as a main component, and if necessary, other ethylenically unsaturated monomers ( For example, those having a hydrophilic group such as a hydroxyl group or a carboxyl group)
A copolymer obtained by copolymerizing

(2) Alkyd resin. General oil or oil-free alkyd resin.

(3) A copolymer obtained by copolymerizing an addition reaction product of a self-condensed polyester of a hydroxyl group-containing fatty acid such as 12-hydroxystearic acid and glycidyl acrylate or glycidyl methacrylate with an acrylate or methacrylate. Graft polymer to be obtained.

(4) Long-chain alkyl esters of acrylic acid or methacrylic acid such as octyl acrylate, lauryl acrylate, stearyl acrylate, octyl methacrylate, lauryl methacrylate, stearyl methacrylate and the like, and acrylic acid or methacrylic acid and as required After copolymerizing other vinyl monomers, the polymer having a side chain double bond obtained by reacting glycidyl acrylate or glycidyl methacrylate with the carboxyl group of the copolymer is converted into an acrylate or methacrylate. A graft polymer obtained by copolymerizing

(5) An alkylated melamine polymer (melamine nucleus has 10 or more nuclei).

(6) A graft polymer obtained by graft-polymerizing an acrylate or a methacrylate onto polybutadiene, polyisoprene, or the like.

And so on. However, these are water-based emulsions at 0 ° C.
Although the following work is not possible, the advantage is that it can be made by selecting a solvent, but there is a drawback that storage stability at a low temperature is often separated and disadvantageous in the past.

(Problems to be Solved by the Present Invention) The present invention relates to an organic solvent having a solubility parameter of 8.3 or less in a monomer having an α, β-unsaturated double bond in the presence of a copolymer of an α-olefin and maleic anhydride. The present invention relates to a non-aqueous dispersion-type resin composition polymerized in a resin. α
-It has been found that a copolymer of olefin and maleic anhydride is very excellent as a dispersion stabilizer, and has led to the present invention. An object of the present invention is to provide a paint which has good storage stability, achieves high solidification and non-pollution, and can be applied in a cold region (below freezing point) which cannot be applied by an aqueous emulsion depending on the selection of a solvent. Further, the present invention provides a material which can be applied as a hot melt ink material such as a thermal ink. The reason why the storage stability is excellent is not necessarily clear, but it is presumed that an effective dispersion stabilizing effect was obtained by copolymerizing the α-olefin and maleic anhydride.

[Configuration of the invention]

(Means for Solving the Problems) The present invention relates to a method for preparing a monomer having an α, β-unsaturated double bond in an organic solvent having a solubility parameter of 8.3 or less in the presence of a copolymer of α-olefin and maleic anhydride. The present invention relates to a non-aqueous dispersion type resin composition polymerized by

The dispersion stabilizer of the present invention is a copolymer of an α-olefin and maleic anhydride, and as the α-olefin, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1- Octene, 1-nonene, 1
-Decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 1-docosene, 1-tetracocene, 1-hexacocene, 1-octacocene, 1-triaconten, 1-dotriaconten, Examples thereof include 1-tetratriaconten, 1-hexatriaconten, 1-octatriaconten, 1-tetracontene, and the like, and mixtures thereof. The α-olefin is not particularly limited, but is preferably a liquid or a solid at normal temperature in handling. As a mixture of α-olefin, Mitsubishi Chemical Co., Ltd.
(C20-28), Dialen 30 (C30 or more) and the like are commercially available. As the α-olefin of the copolymer, an α-olefin having 10 or more carbon atoms is desirable.

The method for copolymerizing the α-olefin and maleic anhydride may be carried out without solvent or in combination with a solvent. Maleic anhydride may be charged together with the α-olefin at a time, or may be gradually added to the polymerization system. There is no particular limitation on these polymerization methods.

As the polymerization initiator used at this time, azobisisobutyronitrile, azobis compounds such as azobis 2,4-dimethylvaleronitrile, cumene hydroperoxide, t-
Butyl hydroperoxide, benzoyl peroxide, diisopropyl peroxycarbonate, di-t-butyl peroxide, lauroyl peroxide, t-
Peroxides such as butyl peroxybenzoate, potassium persulfate, and ammonium persulfate; Although not particularly limited to these, it is preferable to use an organic peroxide or an organic azo compound.

Vinyl monomers (monomers) that polymerize in the presence of the resin dispersion stabilizer (copolymer) of the present invention include the following monomers.

(1) An acrylate or methacrylate having an alkyl group having 1 to 18 carbon atoms, for example, methyl acrylate, ethyl acrylate, n-butyl acrylate, iso-butyl acrylate, t-butyl acrylate, acrylic acid 2-ethylhexyl, lauryl acrylate, tridecyl acrylate, stearyl acrylate, cyclohexyl acrylate, etc., methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, t-methacrylate Butyl, 2-ethylhexyl methacrylate, lauryl methacrylate, stearyl methacrylate, cyclohexyl methacrylate and the like.

(2) Hydroxylalkyl acrylate having an alkyl group having 2 to 12 carbon atoms and hydroxyl methacrylate, for example, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 5-hydroxyamyl acrylate 6-hydroxyhexyl acid, 8-hydroxyoctyl acrylate, 10-hydroxydecyl acrylate, etc., 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 5-hydroxyamyl methacrylate, 6-hydroxyhexyl methacrylate, methacryl 8-hydroxyoctyl acid, 10-hydroxydecyl methacrylate and the like. Further, another substituent may be introduced into the alkyl group, and examples thereof include an amino group, an epoxy group, a halide group, a nitrile group, and an amide group.

(3) Others, for example, a hydrolyzable silyl group-containing vinyl monomer, silicon acrylate, silicon methacrylate, fluorine acrylate, fluorine methacrylate, acrylonitrile, styrene, vinyl toluene, methacrylonitrile, dialkyl itaconate, dialkyl fumarate, Allyl alcohol, acrylic chloride, vinyl acetate, vinyl chloride, vinylidene chloride, vinyl pyridine, vinyl pyrrolidone, methyl vinyl ketone, and the like.

The polymerization is carried out, for example, in an organic solvent having a solubility parameter of 8.3 or less. Specific examples include, but are not limited to, aliphatic hydrocarbons such as hexane, heptane, octane, cyclohexane, and methylcyclohexane, and mixtures mainly containing mineral spirits, aliphatic naphtha, and the like.

Generally, as a polymerization method, it is preferable to dissolve a dispersion stabilizer in an organic solvent, and then to carry out polymerization by dropping a monomer solution and a polymerization initiator into this solution. At this time, the solid content concentration and the viscosity can be freely changed by appropriately selecting the synthesis conditions. The weight ratio of the dispersion stabilizer to the vinyl monomer to be copolymerized to form a dispersed particle composition is preferably from 95/5 to 30/70. If more dispersion stabilizers are used, the performance of the dispersed particles cannot be sufficiently exhibited, and the physical properties of the coating film deteriorate. If the amount is too small, the particles do not emulsify well and precipitate, resulting in poor storage stability.

As the initiator used in the polymerization, a general polymerization initiator is used. For example, azobisisobutyronitrile,
Azobis compounds such as azobis 2,4-dimethylvaleronitrile. Organic peroxides such as benzoyl peroxide and lauroyl peroxide are also used.

Further, the non-aqueous dispersion type resin composition according to the present invention may further contain an amino resin and / or an epoxy resin, if necessary. Such an added resin acts as a cross-linking agent, and when a functional group remains in the resin, the resin is cross-linked and hardened by a dehydration condensation reaction or an addition reaction to form a stronger film, water resistance, alkali resistance, Acid resistance and solvent resistance can be imparted. Examples of such amino resins include conventionally known urea-formaldehyde condensates modified with monohydric alcohols such as methanol and butanol, and monomeric and polymeric melamine resins. Further, the epoxy resin is cross-linked by an addition reaction between the epoxy group in the molecule and the methylol group or the amine group in the composite resin, so that a stronger film can be formed. Such epoxy resins include polyphenol glycidyl ethers having an average molecular weight of at least about 350, preferably about 350-3000 and an epoxy equivalent in the range of 150-3000, preferably 200-2000. The mixing ratio of the lower amino resin and / or the epoxy resin to the composite resin is 40/60 to 5/95, preferably 30/70 to 10/90 in weight percentage ratio. If the amount of the amino resin and / or the epoxy resin exceeds the above range, the inherent performance of the resin cannot be sufficiently exhibited, and if the amount is less than the above range, the effect as a crosslinking agent is not sufficient.

If necessary, additives such as pigments, fillers, plasticizers, pigment dispersants, solvents, thickeners, preservatives, defoamers, leveling agents, and the like can be used in the composition of the present invention. next,
The present invention will be specifically described with reference to examples.

"Production Example of Dispersion Stabilizer" Production Example 1 757.4 g of 1-octadecene, 2.7 g of di-tert-butyl peroxide, and 10 g of toluene were charged into a flask, and the flask was purged with nitrogen. 29
4.2 g was added every 2 minutes, 9.8 g, and 2.1 g di-t-butyl peroxide was added every 20 minutes, 0.7 g. After the addition was completed, the temperature of the system was maintained at 160 ° C., and the reaction was further performed for 6 hours. After the completion of the reaction, the contents were taken out with heating, cooled and solidified.

Production Example 2 1276 g of Diamond 208, di-t-butyl peroxide
After charging 3.6 g and toluene 14 g into a flask and purging with nitrogen, heating and stirring at 150 ° C., while stirring, 412 g of maleic anhydride was used.
13.7 g every 2 minutes, and di-t-butyl peroxide
1.8 g was added 0.9 g every 20 minutes. After the addition was completed, 1 g of di-t-butyl peroxide was further added, and the temperature of the system was raised to 160 ° C.
And reacted for an additional 6 hours. After the completion of the reaction, the contents were taken out with heating, cooled and solidified.

Production Example 3 1350 g of Dialen 30 and di-t-butyl peroxide 2.
After charging 7 g and toluene 14 g to a flask and purging with nitrogen, heating and stirring at 150 ° C., while stirring, 323 g of maleic anhydride
Was added every 2 minutes, and 2.1 g of di-tert-butyl peroxide was added 0.7 g every 20 minutes. After the addition was completed, 1 g of di-t-butyl peroxide was further added, and the temperature of the system was lowered to 16 ° C.
The reaction was maintained at 0 ° C. for a further 6 hours. After the completion of the reaction, the contents were taken out with heating, cooled and solidified.

Production Example 4 After charging 100 g of ethylcyclohexane into a flask and purging with nitrogen, heating and stirring at 110 ° C., 75 g of 2-ethylhexyl acrylate, 10 g of 2-hydroxylethyl acrylate, 15 g of glycidyl methacrylate, and 1 g of azobisisobutyronitrile were added. The dissolved monomer solution was added dropwise over 1 hour. After completion of the dropwise addition, 0.2 g of azobisisobutyronitrile was further added, and the temperature of the system was kept at 110 ° C., and the reaction was further performed for 3 hours. A resin solution having a solid content of 50.7% was obtained.

Production Example 5 After charging 100 g of ethylcyclohexane into a flask and purging with nitrogen, heating and stirring at 110 ° C., 50 g of lauryl methacrylate, 35 g of butyl methacrylate, 15 g of 2-hydroxylethyl methacrylate, 5 g of acrylic acid, and 1 g of azobisisobutylnitrile were added. The dissolved monomer solution was added dropwise over 1 hour. After completion of the dropwise addition, 0.2 g of azobisisobutyronitrile was further added, and the temperature of the system was kept at 110 ° C., and the reaction was further performed for 3 hours. A resin solution having a solid content of 51.2% was obtained.

Example 1 32 g of the resin obtained in Production Example 1 and ethylcyclohexane 3
2 g was charged into a flask, and after purging with nitrogen, heated to 80 ° C. 24 g of methyl methacrylate, 24 g of ethyl acrylate, 48 g of ethylcyclohexane and 0.72 g of benzoyl peroxide were dissolved, and the monomer solution was added dropwise over 1 hour. After the dropwise addition, 0.24 g of benzoyl peroxide was further added, and the mixture was further heated and stirred for 2 hours. A milky white resin dispersion having a solid content of 49.1% was obtained.

Example 2 48 g of the resin obtained in Production Example 2 and ethylcyclohexane 4
8 g was charged into a flask and, after purging with nitrogen, heated to 80 ° C. 24 g of methyl methacrylate, 24 g of ethyl acrylate, 16 g of ethylcyclohexane and 0.72 g of benzoyl peroxide were dissolved, and the monomer solution was added dropwise over 1 hour. After the dropwise addition, 0.24 g of benzoyl peroxide was further added, and the mixture was further heated and stirred for 2 hours. A milky white resin dispersion having a solid content of 60.8% was obtained.

Example 3 A flask was charged with 38.4 g of the resin obtained in Production Example 3 and 38.4 g of ethylcyclohexane, and the mixture was purged with nitrogen and then heated to 80 ° C. 28.8 g of methyl methacrylate, 28.8 g of ethyl acrylate, 25.6 g of ethylcyclohexane and 0.864 g of benzoyl peroxide were dissolved, and the monomer solution was added dropwise over 1 hour. After the dropwise addition, 0.288 g of benzoyl peroxide was further added, and the mixture was further heated and stirred for 2 hours. 60.9% solids
To obtain a milky white resin dispersion.

Comparative Example 1 A flask was charged with 78.9 g of the resin solution obtained in Production Example 4 and 41.1 g of ethylcyclohexane.
Heated to ° C. 20 g of methyl methacrylate and 20 g of ethyl acrylate were dissolved, the monomer solution was added dropwise over 1 hour, and 0.8 g of benzoyl peroxide was added four times in 0.2 g portions. Heating and stirring were further performed for 2 hours. A milky white resin dispersion having a solid content of 49.9% was obtained.

Comparative Example 2 A flask was charged with 78.1 g of the resin solution obtained in Production Example 5 and 41.9 g of ethylcyclohexane.
Heated to ° C. 20 g of methyl methacrylate and 20 g of ethyl acrylate were dissolved, the monomer solution was added dropwise over 1 hour, and 0.8 g of benzoyl peroxide was added four times in 0.2 g portions. Heating and stirring were further performed for 2 hours. A milky white resin dispersion having a solid content of 49.1% was obtained.

The viscosity at 25 ° C. and the storage stability at low temperature of the resin dispersions obtained in Examples 1 to 3 and Comparative Examples 1 and 2 were evaluated. Also, 100 parts of these resin dispersions were mixed with 10 parts of phthalocyanine blue, and the pigment dispersibility was evaluated.
The results are shown in the table.

(Effect of the Invention) The non-aqueous dispersion type resin composition of the present invention thus obtained is
As shown in the following table, a very stable and high solid content product was obtained, the pigment dispersibility was excellent, it was widely applicable to paints and heat-sensitive inks, etc., and it was found to be industrially extremely useful.

Claims (2)

(57) [Claims] 1. A method comprising: polymerizing a monomer having an α, β-unsaturated double bond in an organic solvent having a solubility parameter of 8.3 or less in the presence of a copolymer of an α-olefin and maleic anhydride. Non-aqueous dispersion type resin composition. 2. The non-aqueous dispersion type resin composition according to claim 1, wherein the α-olefin has 10 or more carbon atoms.