JPS6050222B2 - Resin composition with good UV blocking properties - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [I] Background Technical Field of the Invention The present invention relates to a method for producing a thermoplastic resin based on an aliphatic mono- or diolefin polymer in which an ultraviolet absorber is stably dispersed.

With this invention, ``fat one', J-AΛ4↓bit], ,
For example, polyolefin (including polyethylene). Ever since polyolefin was introduced to the world as a general-purpose plastic, its advantages such as strength, durability, moisture resistance, price, and transparency in the case of film have been exploited to make it suitable for use in food packaging, general packaging, civil engineering and construction, etc. Agriculture,
It has come to be used in place of paper, wood, cellophane, metal, etc. in other fields, and has become an indispensable material in modern society.

As the applications of polyolefins expand in this way,
There is also an increasing demand for new functions not found in conventional polyolefins, such as particularly long-term or particularly high weather resistance and ultraviolet blocking properties to protect the contents from ultraviolet rays.

In order to impart weather resistance or ultraviolet blocking properties to resin materials, ultraviolet absorbers are generally added. However, in general, ultraviolet absorbers have poor compatibility with polyolefins, and even if they are added, they ooze out onto the surface of the polyolefin molded product and seriously impair the appearance of the molded product, so it is necessary to add only a small amount. As a result, the weather resistance is not sufficiently improved and the ultraviolet blocking property is also insufficient. Some resins other than polyolefins do not have this problem.

For example, methacrylic resins have particularly good compatibility with ultraviolet absorbers, allowing a large amount of ultraviolet absorbers to be added, resulting in a resin material with good ultraviolet blocking properties and good appearance. However, methacrylic resin is too rigid and cannot be used as a flexible yet strong material like polyolefin. There are other resins that have good compatibility with ultraviolet absorbers such as vinyl chloride resin and fluororesin, but they cannot be used as general-purpose resin materials due to hygiene issues, mechanical properties such as strength and flexibility, film molding methods, etc. Due to problems such as price, it is only used in some fields. [Summary of the old invention] The present invention aims to solve the above-mentioned problems and provide a polyolefin-based resin material with excellent ultraviolet blocking properties. It is an attempt to achieve a goal.

Therefore, the resin composition with good ultraviolet blocking properties according to the present invention is characterized by containing the following components a and b (and c).

a Ultraviolet absorber-containing polar vinyl or vinylidene polymer, b aliphatic mono to diolefin polymer particles 50 to 9
Weight % and vinyl or vinylidene monomer 50-1% by weight
a thermoplastic polymer obtained by impregnating at least a major portion of this monomer into the polymer particles in an aqueous suspension containing and then polymerizing the monomer; Polymer.

St. ．． The content of a based on a+b is 1 to 5 saliva! %, a
The content of b based on +b is 99-5%, and the content of c is based on a+b.
The content of the ultraviolet absorber is 0 to 8% by weight, and the content of the ultraviolet absorber based on a+b+c is 0.01 to 15% by weight.

Effects: In the present invention, a UV absorber pre-blended into a polar vinyl (including vinylidene) polymer that is easy to blend is introduced into a specific modified polyolefin-based resin, and then incorporated into the resin composition. Achieves a large amount and uniform dispersion of ultraviolet absorber.

A polyolefin-based thermoplastic resin into which an ultraviolet absorber is introduced in such a specific and limited manner contains a necessary and sufficient amount of ultraviolet absorber, and there is no problem of leaching. This effect of the present invention should be said to be unexpected.

This is because, in addition to the method of the present invention, an embodiment of combining a polyolefin, a vinyl monomer or a vinyl polymer thereof, and an ultraviolet absorber is to simply incorporate the ultraviolet absorber into each of the polyolefin and the vinyl polymer. Furthermore, there is a mode in which both resins are kneaded, but in this case, the ultraviolet absorber may escape over time, poor film formation properties, poor appearance of the molded product, etc.
There are drawbacks such as poor mechanical properties of molded products, and when a copolymer of olefin and polar monomer is used as the polyolefin and a UV absorber is kneaded into it, the escape of the UV absorber over time is somewhat reduced. However, it is inevitable that the entire amount will eventually escape.Furthermore, when blending polyolefin with a vinyl polymer in which an ultraviolet absorber has been kneaded, it is well known that the two resins may be interphase due to poor compatibility. This is because a peeling phenomenon occurs, resulting in a significant decrease in mechanical strength.The modified polyolefin used as component b of the composition of the present invention is disclosed in Japanese Patent Application Laid-Open No. 52-329.
9 and 52-503 by the method described in each publication.

Therefore, these prior art techniques shall be utilized in the present invention as long as they do not contradict the spirit of the present invention. [■] Detailed description of the invention 1 Ultraviolet absorber-containing polar vinyl polymer (component a) (1)
Vinyl Polymers As mentioned above, include vinylidene polymers.

This vinyl polymer consists of polar ethylenically unsaturated monomers (
(especially those containing oxygen, nitrogen, nitrogen, and other atoms)
Preferably, it is a homo- or copolymer (random copolymer, block copolymer or graft copolymer onto a substrate (eg polyolefin)).

In any case, it is preferred that the content of components from polar monomers is at least 1% by weight.

Specifically, for example, there are the following.

(1) Acrylic or methacrylic thermoplastic resin
It is one of the particularly preferred ones for use in the present invention.

Thermoplastic homopolymers of acrylic acid or methacrylic acid, or functional derivatives thereof such as salts, amides, esters, etc., are one representative example.

Typical monomers are esters, especially lower alkyl esters.

Other representative examples are such copolymers of acrylic monomers (particularly those in which the acrylic monomer accounts for at least 1% by weight of the monomer component).

Specific examples include methyl acrylate-acrylonitrile copolymer, ethyl acrylate-styrene copolymer, and ethyl acrylate-ethyl methacrylate copolymer.

(2) Vinyl chloride resin This is one of the particularly preferred resins for use in the present invention.

Homo of vinyl chloride or vinylidene chloride There are polymers and copolymers.

Examples of the copolymer 2 include vinyl acetate, ethylene, acrylic acid or its ester, and others.

(3) Styrenic thermoplastic resin One representative example is a homopolymer of a core or side chain substituted derivative (especially a methyl or halo (especially chloro) substituted derivative) of styrene.

Other typical examples include copolymers of styrene or substituted styrene (particularly in binary systems in which styrene or substituted styrene constitutes at least 50% of the monomer components).
% by weight).

Specifically, for example, styrene-acrylonitrile,
Acrylonitrile-(poly)butadiene-styrene, acrylonitrile-chlorinated polyethylene-styrene. Ren, acrylonitrile-ethylene propylene rubber-styrene,
Methyl methacrylate-(poly)butadiene-styrene,
There are copolymers (including graft copolymers) of styrene-elastomer-methyl methacrylate, etc.

(4) Vinyl acetate resins Homo- or copolymers of vinyl acetate, such as vinyl acetate-vinyl alcohol copolymers (partial hydrolysates of polyvinyl acetate), ethylene-vinyl acetate copolymers (the content of components from vinyl acetate is (approximately 5 to 40% by weight) is suitable.

(5) Nitrile Resin Thermoplastic homo- or copolymers of acrylonitrile or methacrylonitrile, such as acrylonitrile-styrene copolymers, acrylonitrile-butadiene-styrene copolymers, etc. are suitable.

(6) Mixture of 2 to 5 of the above (1) to (5) 2) Ultraviolet absorber The ultraviolet absorber to be added to the above polar vinyl polymer is effective against these polar vinyl polymers or the polyolefins described below. Various ultraviolet absorbers that are known to be able to be used can be used.

Since these are utilized as solutions in vinyl monomer, they should be soluble in vinyl monomer in significant concentrations. Note that if a given vinyl monomer cannot dissolve the required amount of ultraviolet absorber, an appropriate solvent may be used in combination. Specific examples of the ultraviolet absorber used in the present invention are as follows.

These may be used in combination within each group or between each group. (1
) Benzophenone 2-hydroxy-4-n-octylbenzophenone 2-hydroxy-4-methoxy 2"-carboxybenzophenone 2-hydroxy-4-methoxybenzophenone, others (2) Benzotriazole 2-(2"-hydroxy-3"-Tert- Butyroux 5
'-Methylphenyl)-5-chlorobenzotriazole (TINUVIN326) 2-(2''-hydroxy-3''・5''-di-Tert-butyl-phenyl)-5-
Chlorobenzotriazole (TINUVIN327)2
-(2″-Hydroxy-4″-octylphenyl)benzotriazole, others (3) Salicylic acid type 4-t-butylphenyl salicylate p-octylphenyl salicylate, others (4) Benzoate type 2・4-di-t-butylphenyl-3,5-di-t-
Butyl-4-hydroxypenzoate, others (5) Nickel phenolate-based nickel-4-hydroxypenzoate, others.

(3) Preparation of component a To prepare component a by blending the ultraviolet absorber with the polar vinyl polymer, any method that can be used for blending the ultraviolet absorber with the polymer material may be used. can.

Specifically, for example, the vinyl polymer may be melted or fluidized using a suitable kneading device and mixed with the ultraviolet absorber. The UV absorber content of the resulting UV absorber-containing vinyl polymer (i.e. component a) is such that it is 0.01 to 15% by weight based on the total amount of the composition of the invention, i.e. components a+b+c (c can be zero). should be adjusted to

2 Modified Polyolefin Etc. Polymer (Component B) Component B is produced by impregnating granulated aliphatic mono- or diolefin polymers (sometimes referred to as polyolefin resin) with a vinyl monomer in an aqueous medium. It is obtained by polymerizing monomers.

(1) Resins such as polyolefins A group of resins such as polyolefins are homopolymers of aliphatic monos or diolefins, and others! One group is copolymers of these olefins or of these olefins and copolymerizable monomers (in the case of the latter copolymers, the content of these olefins is 5% by weight or more).

[Copolymer] shall include random, block, tri- and graft copolymers. Further, such polymers may be a mixture of each other, or may be a mixture of up to the same weight percent of a compatible polymer as the polymer. 4 An example of classifying such polymers by monomer type is as follows:
Homopolymers of α-olefins (including ethylene) having 2 to 2 carbon atoms, copolymers of these with each other,
and copolymers with monomers copolymerizable with these (α-
(Preferably, the olefin content is 6% or more by weight).

Specifically, for example, high-pressure, medium-pressure or low-pressure polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1, ethylene-propylene random copolymer, ethylene-propylene block copolymer,
Typical examples include propylene-butene-1 random copolymer, propylene-ethylene-butene-1 random copolymer, ethylene-vinyl acetate copolymer, maleic anhydride-modified polypropylene, and the like. From the viewpoint of obtaining a general-purpose resin material, polyethylene, polypropylene, ethylene-propylene block or random copolymers, etc. are preferred. In addition to such resinous polymers, the polymers of interest in the present invention may also have some degree of elasticity.

Specifically, uncrosslinked or low crosslinked elastomers known as thermoplastic elastomers, such as ethylene-propylene (-diene) copolymer rubber, natural rubber, polyisobutylene rubber, butyl rubber, chlorobutyl rubber, polybutadiene, There are styrene-butadiene copolymers, etc. Alternatively, a mixture of any amount of these and an olefin polymer may be used. The resin such as polyolefin used in the present invention is in the form of particles.

The particle size is preferably 1 to 5 wm.

Particle sizes smaller than the above can be used if the particle properties can be sufficiently maintained in an aqueous medium after impregnation with vinyl or vinylidene monomers, while larger particles can also be used if a crushing operation is not required after polymerization. It is. 2) Vinyl monomer As mentioned above, vinylidene monomer is included.

Any radically polymerizable vinyl monomer can be used as long as it is capable of impregnating a given polyolefin or other resin particle in the aqueous medium in the required amount and is capable of at least partially dissolving the UV absorber.

Specific examples of vinyl monomers that can be used in the present invention include styrene and styrene derivatives, such as α-methylstyrene, vinyltoluene, chlorostyrene, methacrylic acid esters such as methyl methacrylate (especially C1-C
8 alkyl esters), acrylic esters (especially C1-C8 alkyl esters) such as ethyl acrylate, conjugated dienes such as 1●3-butadiene and isoprene, vinyl esters such as vinyl acetate, acrylonitrile , unsaturated nitriles such as methacrylonitrile, and unsaturated mono- or dihalides such as vinyl chloride and vinylidene chloride.

These can be used together. Further, a very small amount of a crosslinkable diene or polyene monomer, such as divinylbenzene, can be used in combination with such monomers.

The amount of the vinyl monomer is such that the total weight of the polyolefin resin and the like is 50 to 99% and the vinyl or vinylidene monomer is 50 to 1% by weight. Resin such as polyolefin 10
It is preferably about 1 to 10 parts by weight, particularly about 3 to 50 parts by weight.

If the amount is less than 1 part by weight, it is practically difficult to control the polymerization reaction and control the product.

On the other hand, if it exceeds 10 parts by volume, not only can no further improvement in moldability be expected, but also the contribution of the mechanical strength of the resin such as polyolefin to the resulting resin material decreases. Furthermore, during impregnation or polymerization, resins such as polyolefins are dissolved in these vinyl or vinylidene monomers, and the resulting modified particles may have irregular particle sizes or become blocked, making stirring impossible.

(3) Radical polymerization initiator In the present invention, resin particles such as polyolefin are impregnated with vinyl monomers in an aqueous medium without substantially polymerizing the vinyl monomers, and then this aqueous dispersion is heated to form monomers. The polymerization is usually promoted by a radical polymerization initiator.

This polymerization initiator must be able to be impregnated into resin particles such as polyolefin together with the monomer. Therefore, the radical polymerization initiator used in the present invention is oil-soluble.

And the decomposition temperature to obtain a half-life of 1 hour is 50~
Preferably, the temperature is 150°C. Here, "the decomposition temperature to obtain a half-life of 1 hour" means that ICB
! It means the temperature at which the decomposition rate of the polymerization initiator is 50% when left for a while. It goes without saying that if the impregnation step is carried out at a sufficiently low temperature, a polymerization initiator that is more decomposable at lower temperatures can be used. Specific examples of radical polymerization initiators that can be used in the present invention include lauroyl peroxide (62 is C), benzoyl peroxide (
740C), t-butyl peroxybenzoate (10
4°C), organic peroxides such as dicumyl peroxide (11rC), azobisisobutyronitrile (65°C), etc.
), and others (the temperature in the cutlet above is the half-life temperature mentioned above).

There is no limit to the amount of the polymerization initiator, but it is generally about 0.01 to 1% by weight, usually 0.1 to 2.0% by weight of the monomer weight used. It is about % of call volume.

The polymerization initiator is usually used dissolved in vinyl or vinylidene monomer.

4) Impregnation of polyolefin or other resin particles with a monomer in an aqueous medium A typical method for impregnating polyolefin or other resin particles with a vinyl or vinylidene monomer in an aqueous medium is to impregnate polyolefin or other resin particles with a monomer in an aqueous dispersion of polyolefin or other resin particles. Preferably a polymerization initiator (and other additives if necessary)
The process consists of adding dissolved monomers and stirring.

Another method is to add resin particles such as polyolefin to an aqueous dispersion of a monomer dissolved in a polymerization initiator and stir the mixture. During the impregnation process, virtually no polymerization occurs.
At a temperature sufficiently low in correlation with the decomposition temperature of the polymerization initiator used,
Generally it should be operated at room temperature to 100°C.

In this step, the monomer is impregnated so that the amount of free monomer is 5% or less of the amount of monomer used.

Since resins such as polyolefins are relatively compatible with vinyl monomers, even if 5% or more of the monomers are free before the start of polymerization, these monomers will be impregnated into resin particles such as polyolefins during polymerization. (including adhesion), the polymer particles obtained by polymerizing these monomers will not precipitate independently from the modified polyolefin or other resin particles. The impregnation time is usually about 2 to 8 hours.

The content of resin particles such as polyolefin and vinyl or vinylidene monomer in the aqueous dispersion is usually about 5 to 10 parts by weight per 10 parts by weight of water.

Such aqueous dispersions can be maintained in a stable dispersed state simply by sufficient stirring, but dispersions can be prepared more easily and stably by using an appropriate suspension stabilizer. can.

As the suspension stabilizer in this case, those that can be used as a suspension stabilizer in the aqueous suspension polymerization of vinyl or vinylidene monomers can generally be used, and specifically, for example, polyvinyl alcohol, Water-soluble polymer substances such as methylulose and hydroxycellulose, anionic surfactants such as alkylbenzene sulfonates, non-ionic surfactants such as polyoxyethylene alkyl ether, and water-insoluble polymers such as magnesium oxide and calcium phosphate. Inorganic salts and the like are used alone or in combination in an amount of about 0.01 to 1% by weight based on water. When impregnating resin particles such as polyolefin with vinyl or vinylidene monomers (and polymerization initiators), auxiliary materials such as plasticizers, lubricants, antioxidants, blowing agents, mold release agents, and colorants are added at the same time.
(These auxiliary materials may already be added to the resin, such as polyolefin, or may be incorporated after polymerization).

(5) Polymerization When the temperature of the aqueous dispersion prepared in this way is raised to a temperature above which the polymerization initiator used decomposes at an appropriate rate, the impregnated vinyl or vinylidene monomer is dissolved. Polymerization produces resin particles such as modified polyolefin.

Since radical polymerization is to be carried out, heating should be carried out in an atmosphere substantially free of oxygen, and it is preferable to appropriately stir the aqueous dispersion during polymerization. The polymerization temperature is determined in relation to the decomposition temperature of the polymerization initiator used, but is generally about 50 to 150°C.

The polymerization temperature need not be constant throughout the polymerization period. The polymerization time is usually between 2 and 1 Ctf.
The polymerization pressure is usually about normal pressure to 10k91 cIt. Further, in order to adjust the molecular weight of the polymer produced as a result of polymerization of vinyl monomers, a chain transfer agent such as n-butylmercaptan, n-dodecylmercaptan, t-dodecylmercaptan or the like may be added.

After polymerization, if the same post-treatment as for aqueous suspension polymerization of ordinary vinyl monomers (e.g. styrene) is carried out, the shape of the polyolefin resin particles used will be maintained almost unchanged and can be used immediately as a molding material. Resin particles such as modified polyolefin that can be obtained are obtained.

The modified polyolefin resin of the present invention is presumed to be a polyolefin resin containing a polymer made of uniformly dispersed vinyl monomers, a vinyl monomer grafted onto a polyolefin resin base, or a mixture thereof. , polymer particles unique to vinyl monomers do not exist separately from resin particles such as polyolefin.

3. Thermoplastic polymer (component c) The composition of the present invention may contain a thermoplastic resin that is miscible with components a and b, if necessary.

One group of thermoplastic resins in this case is the resins such as polyolefins explained in connection with component b, and the other group is the polar vinyl polymers explained in connection with component a.

Additionally, polycarbonates (eg aromatic polycarbonates), polyamides, polyesters (eg polyterephthalates), etc. can also be used as long as they are miscible with the given components a and b. Preparation of Compositions of the Invention The compositions of the invention can be prepared from components a and b (and c) by any method that can be used for compounding resin materials.

Specifically, for example, each component may be melted or fluidized and mixed using a suitable kneading device. The contents of components a-c are as follows.

Large x 100 = 1-5% call volume, preferably 2-40a+b
Weight%±×100=99-50% by weight, preferably 98
~60a+b weight% ■×100=0-8 heel weight%, preferably 0-75a+b
Weight% The content of the ultraviolet absorber based on components a+b+c is 0.01 to 15% by weight, preferably 0.01 to 10% by weight.

The resin composition of the present invention can contain various auxiliary materials commonly used in resin compositions, such as fillers, lubricants, foaming agents, colorants, and others.

The composition of the present invention can be used for manufacturing various molded products, films, fibers, and others. 5 Experimental Examples Reference Example 1 100 liters of pure water in an autoclave with a capacity of 200 liters
k9, 2 kg of tricalcium phosphate as a suspending agent, and 3 q of sodium dodecylbenzenesulfonate as a suspending agent.
was added to form an aqueous medium.

Separately, t-butyl peroxybenzoate 75y was dissolved in methyl methacrylate 15k9 as a polymerization initiator,
This was added to the above aqueous medium and stirred to suspend it.

To this, low density polyethylene (density 0.91 & Ml45q
/1 gin) Pellets 35k9 were introduced and the inside of the autoclave was replaced with nitrogen gas, and the system temperature was raised to 90'C and maintained for 3 hours to dissolve the polymerization initiator-containing methyl methacrylate into the above pellets. impregnated with. This aqueous suspension was heated to 105°C and held for 3 hours to effect polymerization, and further heated to 120°C and held for 2 hours to complete polymerization.

After cooling, the contents were taken out and washed with acid and water to obtain modified polyethylene particles [A] (polymethyl methacrylate content: 3% by heel weight) 50k9.

Reference Example 2 Modified polyethylene particles [B] (polymethyl methacrylate content: 5%) were prepared in the same manner as in Reference Example 1 by changing the ratio of polyethylene and methyl methacrylate.
Got 0k9.

Reference Example 3 7 parts of polymethyl methacrylate ("Acrypet MF" manufactured by Mitsubishi Rayon Co., Ltd.) and 3 parts of ultraviolet absorber ("TINUVIN327" manufactured by Ciba-Geigy) were blended to produce 40rrLI7T1. The mixture was melt-kneaded (160'C) in an extruder with a φ diameter vent to obtain pellets.

It has been impossible to produce a film from the above pellets using an inflation molding machine using conventional methods. A 100μ film was produced from the above pellets by breath molding,
When the film was left standing in a gear open state at 80° C., the retention rate of the ultraviolet absorber was measured over time using an ultraviolet absorption spectrum, and the retention rate was 100% even after 1000 ctf.

Example 1 Modified polyethylene [A] 7 obtained in Reference Example 1
0 parts by weight and 3 parts by volume of the polymethyl methacrylate obtained in Reference Example 3 (ultraviolet absorber content: 3% by volume) were blended and melt-kneaded (160°C) in an extruder with a 407TL1TrLφ diameter vent to form pellets. I got it.

From this pellet, a film with a thickness of 100 μm was produced using an inflation molding machine in a conventional manner. When the retention rate of the ultraviolet absorber was tracked for this film over time, it was found that 98% or more was retained after 1000 C@. Furthermore, the strength of the above film was measured.

The results are shown in Table 1. Comparative Example 1 3 parts of polymethyl methacrylate (ultraviolet absorber content: 3% filtration) obtained in Reference Example 3 and low-density J-degree polyethylene σ Yucalon NH5O, density 0.925, Ml 2.8
) 70 parts by weight to form 407TLI7n,φ
Pellets were obtained by melt-kneading (160°C) using an extruder with a diameter vent.

When an attempt was made to manufacture a film from these pellets using an inflation molding machine, a phenomenon of phase separation occurred and it was not possible to obtain a uniform and transparent film. This phenomenon is presumed to be caused by poor compatibility between the two polymers. For reference, the above pellets were formed into a film with a thickness of 100 μm by press molding, and the strength of the film was measured. The results are shown in Table 1. Example 2 10 parts of polymethyl methacrylate obtained in Reference Example 3 (ultraviolet absorber content: 3%) and low density polyethylene ("Yukalon NH5O" density: 0.925sMI2.8)
Modified polyethylene obtained in Reference Example 1 with 16 parts weight [A
] 10 parts by volume were blended and a film with a thickness of 100 μm was produced using an inflation molding machine.

When the retention rate of the ultraviolet absorber was tracked for this film over time, the retention rate was 98% or more after 1000 hours in a gear open state of 80°C. Furthermore, the strength of the above film was measured.

The results are shown in Table 1. Comparative Example 2 10 parts of polymethyl methacrylate (ultraviolet absorber content: 3% by weight) obtained in Reference Example 4 and 10 parts of modified polyethylene [A] obtained in Reference Example 1 were added with a low density 165 parts by weight of polyethylene σ Yucalon NH5O") was added and blended, and an attempt was made to produce a film with a thickness of 100 μm using an inflation molding machine, but a slight interphase peeling phenomenon occurred and film breakage occurred.

Therefore, there is a limit to the amount of thermoplastic polymer, and a component ratio of 45% by weight or less is estimated to be the limit for obtaining a substantial molded product.

Reference Example 4 The film obtained in Example 1 was made into a bag and commercially available oil sweets (potato chips) were put therein.

Similarly, oil sweets were placed in a general polyethylene bag. The peroxide value of the original oil confectionery was measured according to the method for measuring peroxide value of instant noodles described in Ministry of Health and Welfare Notification No. 17, and it was found to be 1.7 meqIkg. Place the above packaging bag in a constant temperature and humidity room at 23℃ and 50% humidity, directly under a pure natural white fluorescent lamp for general lighting at 50℃! When the peroxide value was measured after standing in the RL for one month, it was 1 in the case of the example.
．． There was almost no change at 8meq/K9, and in the case of general polyethylene, it increased to 32n1eqIkg. Similarly, in the case of the film of Example 2, there was almost no change at 1.8 meqIk9. This result shows that absorption in the ultraviolet region is completely achieved by dispersing the ultraviolet absorber.

Reference Example 5 Modified polyethylene particles [C
] (polymethyl methacrylate 1% by weight) was obtained.

Further, in the same manner as in Reference Example 3, 9 parts by weight of polymethyl methacrylate and 1 part by weight of an ultraviolet absorber were blended,
Pellets [1] were obtained.

This modified polyethylene [C] 9 parts and pellets [1]
1 part by weight to obtain modified polyethylene (ultraviolet absorber content: 0.01% by weight).

Claims (1)

[Scope of Claims] 1. A resin composition with good ultraviolet blocking properties, characterized by containing the following components a and b (and c). a UV absorber-containing polar vinyl or vinylidene polymer, b aliphatic mono- or diolefin polymer particles 50
~99% by weight and vinyl or vinylidene monomers 50-1
a thermoplastic polymer obtained by impregnating at least a major portion of this monomer into the polymer particles in an aqueous suspension containing % by weight and then polymerizing the monomer,
c Thermoplastic polymer. However, the content of a based on a+b is 1 to 50% by weight, a+
The content of b based on b is 99-50% by weight, c based on a+b
The content of the UV absorber is 0 to 82% by weight, and the content of the ultraviolet absorber based on a+b+c is 0.01 to 15% by weight.