JPS6339945A - Propylene polymer composition - Google Patents

Abstract

PURPOSE:To provide the title compsn. having excellent mechanical characteristics, adhesion, weather resistance, gloss and moldability, consisting of a propylene polymer, a specified modified propylene polymer and a linear low-density ethylene copolymer. CONSTITUTION:100pts.wt. propylene polymer or mixture (a) thereof with not more than 40wt% ethylene/propylene copolymer rubber is heat-treated in the presence of 0.1-50pts.wt. org. compd. (b) having at least one unsaturated bond and an OH group per molecule [e.g., 2-hydroxyethyl(meth)-acrylate] and 0.01-20 pts.wt. org. peroxide (c) (e.g., dicumyl peroxide) to obtain a modified propylene polymer (B). Not less than 15wt% propylene polymer (A) having an MFR of 1.0-100g/10 min is blended with 5-50wt% component B and a linear low- density ethylene copolymer (C) having a density of 0.900-0.935g/cm<3>, an m.p. of 106-130 deg.C, an MI of 0.0l-100g/10 min and 3-35 side-chain 1-10C alkyl groups per 1000 carbon atoms in its main chain in such a proportion that the content of the component (b) is 0.01-10wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a propylene polymer composition that not only has excellent adhesion to polyurethane without using a primer but also has good weather resistance. It is an object of the present invention to provide a propylene polymer composition that has excellent mechanical properties such as impact resistance, good weather resistance and gloss, and has excellent adhesion to polyurethane without using a primer. This is the purpose.

Conventional technology As is well known, propylene polymers (propylene homopolymer, propylene copolymer) not only have excellent moldability, but also have excellent mechanical properties, heat resistance, solvent resistance, oil resistance, and chemical resistance. Because of its good properties such as elasticity, it is manufactured in large quantities industrially and is widely used in many fields as industrial parts such as automobiles, electrical appliances, and electronic appliances, and as daily necessities. However, since propylene polymers do not have polar groups in their molecules (so-called non-polar), they do not have good adhesion to polyurethane, which causes various problems. - As an example, a widely used automobile bumper will be explained.

In the past, bumpers made of metal or polyurethane were widely used, but in recent years, with the aim of reducing the weight and cost of automobiles, propylene-based polymers containing propylene as the main component (propylene homopolymer, ethylene - propylene random or block copolymers) or propylene-based polymer-based compositions are widely used. When this bumper is installed on a vehicle, it is often the case that the surface of the molded product is textured in advance and used as is without painting. However, in order to give it a more fresh and luxurious feel, bumpers are often coated with polyurethane paint and installed on vehicles, and this trend is increasing as cars become more luxurious.

However, as mentioned above, propylene-based polymers are chemically extremely inert polymeric substances because they do not have polar groups in their molecules, so when painting polyurethane, it is generally necessary to prepare them in advance. The molded product can be processed using electrical processing methods (for example,
Surface treatment methods such as corona discharge treatment, plasma treatment), mechanical roughening, flame treatment, and oxygen or ozone treatment are commonly used.

Furthermore, prior to these surface treatments, it is recommended that the surface be cleaned in advance with a solvent such as alcohol or aromatic hydrocarbon. Also known are methods in which molded products are immersed in organic solvents such as tricrene, perchlorethylene, pentachloroethylene, and toluene at temperatures close to their boiling points, or exposed to solvent vapor [for example, Kenyuki Takagi,
[See Heizo Sasaki (ed.), "Plastic Materials Course ■, Polypropylene Resin", pp. 216-219, published by Nikkan Kogyo Shimbun, 1962]. However, all of these methods have problems in that they not only require processing equipment, but also require a considerable amount of time for the processing. Therefore, the reality is that the molded product (bumper) is undercoated with a primer that can adhere to a propylene polymer, and then a polyurethane paint is applied as a topcoat. In other words, in this method, the primer undercoat and bake must go through the steps of - polyurethane painting - baking (2 coats, 2 bakes or 3 coats, 2 bakes), and this painting process takes a long time (usually about 1 hour and 30 minutes). )In need of. Therefore, manufacturing bumpers made of propylene-based polymer coated with polyurethane requires a long coating cycle, which not only makes mass production difficult but also increases costs.

In addition, when applying polyurethane when manufacturing automobile parts, motorcycle parts, electrical equipment parts, electronic equipment parts, etc. using propylene-based polymers, the same problems as mentioned above occur, although the application method is different. There is.

Generally, propylene polymers or their compositions used in bumpers etc. contain UV absorbers and UV absorbers to enhance weather resistance.
A combination of ultraviolet stabilizers, antioxidants, etc. is used in any desired formulation. However, after several years of actual driving, the surface of the molded product becomes discolored, chalking or thalassoking occurs, and the current product cannot be said to be sufficient. The demand for higher grades is becoming stronger as automobiles become more luxurious and the proportion of cars used in regions with harsh climates increases.

Therefore, as a countermeasure, it may be possible to increase the amount of the conventional weather-resistant formulation or add new additives, but simply increasing or adding these may cause problems with appearance during molding (for example, surface gloss unevenness or whitening). There are various problems such as additives increased or added to the surface of the molded product after molding may bleed, deteriorating the appearance, and the surface of the molded product may become white due to long-term use during actual driving. be.

Problems to be Solved by the Invention The purpose of the present invention is to solve the problems or drawbacks of the conventional propylene polymer compositions described above, and to improve various mechanical properties (such as impact strength and rigidity) of propylene polymers. By obtaining a propylene-based polymer composition that not only maintains or improves the properties of polyurethane (such as be.

Means and action for solving the problems According to the first aspect of the present invention, the above problems are solved by (A) a propylene polymer, (B) (1) a propylene polymer or a propylene polymer. Mixture 1 with ethylene-propylene copolymer rubber
00 parts by weight with (2) 0.1 to 50 parts by weight of an organic compound having at least one unsaturated bond in the molecule and containing a hydroxyl group and (3) 0.01 to 20 parts by weight of an organic peroxide. A modified propylene polymer obtained by the treatment, and (C) a density of 0.900 g/cj or more and 0.935 g
/ctA, and has a melting point of 106 to 130°C,
Linear low-density ethylene having a melt index of 0.01 to 100 g/10 min and having substantially 1 to 10 carbon atoms and 3 to 35 side chain alkyl groups per 1000 main chain carbon atoms. A composition consisting of a copolymer, the composition ratio of component (C) in the composition is 3 to 25% by weight, and the composition ratio of components (A) and (B) to the total composition is 15% each. % by weight or more and 5 to 50% by weight, and the composition ratio of component (B) (2) to the entire composition is 0.
．． According to the second aspect of the present invention, the above problem can be solved by a propylene polymer composition having a content of (A) a propylene polymer; ) Propylene polymer or mixture of propylene polymer and ethylene-propylene copolymer rubber 1
(2) 0.1 to 50 parts by weight of an organic compound having a small number of unsaturated bonds in the molecule and containing a hydroxyl group; and (3) 0.01 to 20 parts by weight of an organic peroxide. A modified propylene polymer obtained by processing in parts by weight, and (C) a density of 0.900 g/cm3 or more 0.935 g
/- less than A composition comprising a linear low-density ethylene copolymer having 3 to 35 atoms per 1000 atoms, and (D) an inorganic filler, the component (A) occupying in the composition.
, (B), (C) and (D), respectively,
15% by weight or more, 5-50% by weight, 3-25fflff
i% and 2 to 40% by weight, and the composition ratio of component (B) (2) to the total composition is 0.01 to 10% by weight.

Description of specific embodiments of the invention The present invention will be specifically explained below.

(A) Propylene-based polymer The propylene-based polymer blended into the composition of the present invention includes a propylene homopolymer, a block copolymer containing propylene as a main component with ethylene and/or an α-olefin, and a propylene-based polymer as a main component. It is selected from random copolymers with ethylene and/or α-olefin as components. In both of these block copolymers and random copolymers, the copolymerization ratio of ethylene and α-olefin is 20% by weight or less as a total amount thereof, preferably 15% by weight or less.
% by weight or less. Also, the number of carbon atoms in α-olefin is 4
-12, and representative examples of such α-olefins include butene-1, hexene-1,4-methylhexene-1 and octene-1.

These propylene polymers are industrially produced and used in a wide variety of fields.

Furthermore, the physical properties and manufacturing methods of these propylene polymers are well known. Among such propylene polymers, the block copolymers and random copolymers are preferably used.

The melt flow rate (MFR) of this propylene polymer is
(t)) (measured under condition 14 according to JIS K7210) is usually 1.0 to 100 g/10 minutes, and 1.0 to
80 g/10 minutes is desirable, and 2.0 to 60 g/10 minutes is particularly preferred. If a propylene polymer with a V F R (1) of less than 1.0 g/10 minutes is used, not only the kneading properties with the modified propylene polymer tend to deteriorate, but also the moldability of the resulting composition deteriorates. There is a risk that it will get worse.
On the other hand, if a propylene polymer having a V F R (1) of more than 100 g/10 minutes is used, the mechanical strength of the resulting composition tends to decrease, which is not preferable.

(B) Modified propylene polymer The modified propylene polymer of the present invention is obtained by treating a propylene polymer or a mixture of a propylene homopolymer and an ethylene-propylene copolymer rubber with a hydroxyl compound and an organic peracid compound. can be obtained by
Regarding the manufacturing method and others, for example, JP-A-58-
This is as described in detail in Japanese Patent No. 154732.

(1) Propylene-based polymer The propylene-based polymer used to produce the modified propylene-based polymer of the present invention is exactly the same as the propylene-based polymer described above except for MFR (however, the propylene-based polymer It does not need to be the same as combined component A).

Instead of the propylene polymer, a mixture of a propylene polymer and an ethylene-propylene copolymer rubber in the composition ratio described below can also be used. The ethylene-propylene copolymer rubber used in this way is
Its main components are ethylene and propylene.

This ethylene-propylene copolymer rubber includes a copolymer rubber obtained by copolymerizing engineered ethylene and propylene, and a copolymer rubber containing ethylene and propylene as main components, 1,4-pentadiene, 1,5-hexadiene, and 3. Straight or branched diolefins containing two double bonds at the ends such as 3-dimethyl-1,5-hexadiene, 1,4-hexadiene and 6-methyl-1,5-hebutadiene Linear or branched diolefins or bicyclo(2,2,1) containing terminals such as
- By copolymerizing a small amount (generally 10% by weight or less) of a monomer having a double bond such as a cyclic diene hydrocarbon such as hebutene-2 (norbornene) and its derivatives (e.g. ethylidene norbornene). The resulting multi-component copolymer rubber is broadly classified into: In both the copolymer rubber and multicomponent copolymer rubber described above, the preferred propylene content is 20 to 50% by weight. Further, the preferred Mooney viscosity (ML 1+4 (100°C)) of the ethylene-propylene copolymer rubber is 10 to 50, more preferably 10 to 40, and particularly preferably 15 to 40.Mooney viscosity of 10 When using an ethylene-propylene copolymer rubber with an ethylene-propylene copolymer rubber of less than If this is used, flow marks will appear on the surface of the molded product, which is unfavorable in terms of appearance.

When the modified propylene polymer of the present invention is produced using an ethylene-propylene copolymer rubber, the ethylene-propylene copolymer is The proportion of polymerized rubber is usually at most 40% by weight and 1
-40% by weight is preferred, especially 2-35% by weight. If the proportion of ethylene-propylene copolymer rubber in the total amount of propylene homopolymer and ethylene-propylene copolymer rubber exceeds 40% by weight, the adhesion strength with the coating film is good, but the molded This is not preferable because it not only causes flow marks on the surface but also tends to reduce gloss.

The melt flow rate (MFR) of this propylene polymer is
(11) is usually 0.01 to 100 g/10 minutes, preferably 0.01 to 80 g/10 minutes, particularly 0.01 to 100 g/10 minutes, from the viewpoint of moldability and mechanical properties of the resulting composition.
02 to 60 g/10 minutes is suitable.

(2) Hydroxyl compound The hydroxyl compound used to produce the modified propylene polymer described above has at least one unsaturated bond (double bond, triple bond) and contains a hydroxyl group. It is a compound.

Typical examples of such hydroxyl compounds include alcohols having a double bond, alcohols having a triple bond, esters of a -valent or divalent unsaturated carboxylic acid and an unsubstituted dihydric alcohol, and esters of the unsaturated carboxylic acid and an unsubstituted dihydric alcohol. Examples include esters with trihydric alcohols, esters with unsubstituted tetrahydric alcohols, and esters with unsubstituted trihydric or higher alcohols.

Representative examples of such hydroxy compounds include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, and 2-hydroxybutyl methacrylate.

In producing the modified propylene polymer according to the present invention, the hydroxyl compound is added to the propylene polymer 1.
0.1 to 50 parts by weight, preferably 0.00 parts by weight
．． 2 to 30 parts by weight are used, particularly preferably 0.3 to 20 parts by weight. If the ratio of the hydroxyl compound to 100 parts by weight of the propylene-based m-coalescence is less than 0.1 parts by weight, the effect of improving adhesion is insufficient. On the other hand, even if it is used in an amount exceeding 50 parts by weight, the effect of improving adhesion depending on the amount used is not observed, and rather the original properties of the propylene homopolymer are impaired, which is not preferable.

(3) Organic peroxide The organic peroxide used to produce the above-mentioned modified propylene polymer is generally used as an initiator in radical polymerization and as a crosslinking agent for polymers.
Those with a half-life of 1 minute of 100°C or more are preferable, and those with a half-life of 1 minute of 130°C or more are particularly preferable. If an organic peroxide whose temperature is less than 100° C. is used, it is not only difficult to handle, but also the effects of its use are not very noticeable, which is not desirable. Preferred examples of such organic peroxides include 1,1-bis-t
-ketone peroxides such as butylperoxy-3,3,5-trimethylcyclohexane, dialkyl peroxides such as dicumyl peroxide, hydroperoxides such as 2,5-dimethylhexane-2,5-hydroperoxide. Mention may be made of oxides, diacyl peroxides such as benzoyl peroxide and peroxy esters such as 2,5-dimethyl-2,5-dibenzoyl peroxide.

The usage ratio of organic peroxide to 100 parts by weight of propylene polymer is 0.01 to 20 parts by weight, and 0.05 to 20 parts by weight.
10 parts by weight is preferred, and 0.1 to 7 parts by weight is particularly preferred. If the mixing ratio of organic peroxide to 1 part of 100 mff of propylene polymer is less than 0.01 part by weight, it is not preferable because not only the effect of improving the adhesion with polyurethane is low but also the durability of the adhesion strength of the mixture decreases. On the other hand, if it exceeds 20 parts by weight, it is undesirable because the originally excellent mechanical properties of the propylene polymer deteriorate.

(4) Method for producing modified propylene polymer In order to produce the modified propylene polymer used in the present invention, the propylene polymer, hydroxyl compound, and organic peroxide described above are treated (heated) in the above proportions. It can be manufactured by At this time, the propylene polymer, hydroxyl compound, and organic peroxide may be mixed together during the treatment, but they must be mixed in advance in a triblend, or at a relatively low temperature (where the hydroxyl compound does not react). It can also be obtained by kneading the mixture at a temperature (temperature) and heating the resulting mixture as described below.

When processing propylene polymers at high temperatures, the propylene polymers may deteriorate, but the organic peroxide used to graft polymerize the propylene polymers and hydroxyl compounds decomposes. It must be carried out at a temperature that

From the above, this treatment is generally carried out at a temperature of 160 to 300°C, preferably 170 to 280°C, although it varies depending on the type of organic peroxide used.

The general formula and representative examples of the hydroxyl compound and organic peroxide, as well as the mixing method and treatment method, are as described in detail in, for example, JP-A-58-154732.

(C) Linear ethylene copolymer The linear ethylene copolymer used as component (C) in the present invention is obtained by copolymerizing ethylene and α-olefin. This linear ethylene copolymer has a density of 0.900 g/cnf or more and 0.935 g
/ctA, preferably 0.905 g/cn1 or more and less than 0.935 g/cd. If the density of this linear ethylene copolymer is less than 0.900 g/crA,
i4 The stiffness of the composition is not sufficient, while 0.93
5g/an! If it exceeds , the rigidity is high, but the flexibility is insufficient, making it unsuitable. Also, the melting point is 106~1
30°C, preferably 106-125°C, particularly preferably 110-125°C. If a linear ethylene copolymer with a melting point of less than 106° C. is used, the resulting composition will not have sufficient rigidity or heat resistance. On the other hand, if a linear ethylene copolymer with a melting point exceeding 130° C. is used, the resulting composition will have high rigidity, but will lack flexibility, and both are unsuitable. Furthermore, the melt flow rate (JIS
Measured under condition 4 according to K 7210, hereinafter V F R
(referred to as 21) is 0.01 to 100g/10 minutes,
0.1-50g/10 minutes is preferred, especially 5-30g/10 minutes
g/10 minutes is preferred. If the MFR of the linear ethylene copolymer (21 is less than 0.01 g/10 minutes,
It is difficult to uniformly disperse during kneading and tends to cause flow marks during molding. On the other hand, if it exceeds 100 g/10 minutes, moldability is good, but no improvement in impact resistance can be expected.

The α-olefin used in the production of the linear ethylene copolymer is an α-olefin having at most 12 carbon atoms, and representative examples include propylene, butene-1, hexene-1,4-methylpentene- 1 and octene-1. The copolymerization ratio of α-olefin in this copolymer is usually 180 to 18% by weight.

The short chain branch in this linear ethylene copolymer refers to a branch that is sufficiently short compared to the main chain, and has, for example, less than 10 carbon atoms. On the other hand, a long chain branch means a branch having a length sufficiently comparable to that of the main chain, and having, for example, 10 or more carbon atoms. The number of short chain branches (alkyl groups) per 1000 carbon atoms in the main chain of the linear ethylene copolymer is generally 3 to 35, preferably 3 to 30, particularly preferably 5 to 30. be.

(D) Inorganic filler The inorganic filler used as component (E) in the present invention is generally one widely used in the fields of synthetic resins and rubber. Such an inorganic filler is preferably an inorganic compound that does not react with oxygen or water and does not decompose during kneading and molding. The inorganic fillers include metals such as aluminum, copper, iron, lead and nickel, oxides of these metals and metals such as magnesium, calcium, barium, zinc, zirconium, molybdenum, silicon, antimony and titanium, and their water. It can be broadly classified into compounds such as hydrates (hydroxides), sulfates, carbonates, silicates, double salts thereof, and mixtures thereof.

Representative examples of such inorganic fillers are described in Japanese Patent Application No. 59-8535 (Japanese Unexamined Patent Publication No. 60-153202). Among these inorganic fillers, those in powder form preferably have a diameter of 30 microns or less (preferably 10 microns or less). In addition, fibrous materials have a diameter of 1 to 50 mm.
0 microns (preferably 1-300 microns) and a length of 0.1-6 mm (preferably 0.1-5III
Il) is preferable. Furthermore, it is preferable that the diameter of the flat plate is 30 microns or less (preferably 10 microns or less). Among these inorganic fillers, especially tabular fillers (
Flake-like) and powder-like products are preferred.

Suitable inorganic fillers include talc, mica, silica,
Examples include glass fiber, graphite, calcium carbonate, and wollastonite.

The composition ratio of component (B), that is, the modified propylene polymer, in the composition of the present invention is 5.0 to 50% by weight,
Preferably 5.0 to 40% by weight, particularly preferably 7.0%
~40% by weight is preferred. If the proportion of the modified propylene polymer in the composition is less than 560% by weight, the resulting composition will not have good adhesion to polyurethane, and even if it is blended in an amount exceeding 50% by weight, the amount used will be Accordingly, not only is it not possible to exhibit the effect of improving adhesion and weather resistance, but the mechanical strength of the resulting composition tends to decrease.

On the other hand, the proportions of component (A), component (C), and component (D) (when blended) in the propylene composition according to the present invention are i[2t%, and each is 15% or more. , 3-25% and 2-40%, preferably 15% each
-65%, 5-20% and 2-30%, particularly preferably 15-60%, 5-15% and 5-25%, respectively. Furthermore, in the polypropylene composition according to the present invention, the amount of component (B) (2) (i.e., hydroxyl compound) in the entire composition is important, and the amount is generally on a weight basis. It is 0.01-10%, preferably 0.02-10%, particularly preferably 0.01-5%. If this value is too small, the adhesion of the composition to the urethane paint will not be sufficiently improved; conversely, even if a large amount is added, the adhesion and weather resistance will not be improved, and on the contrary, rigidity, heat resistance, etc. This is not desirable as it tends to decrease.

In order to produce the composition of the present invention, the above-mentioned components (A) to (C
) or by uniformly mixing the above (A) to (°D) using a mixing method practiced in the field of ordinary olefin polymers so that the composition ratio is within the above range. good. At this time, all the composition components may be mixed at the same time, or a part of the composition components may be mixed in advance to produce a so-called masterbatch, and this masterbatch and the remaining composition components may be mixed. In this case, stabilizers against heat, oxygen or ultraviolet rays, anti-deterioration agents, plasticizers, flame retardants, lubricants, fillers, colorants, and antistatic agents that are generally blended (added) to olefin polymers. Additives such as electrical property improvers may also be added depending on the purpose of use of the composition, as long as the physical properties of the composition are not essentially impaired.

The composition thus obtained is usually molded into pellets, and the desired molded product is produced by a molding method such as injection molding or extrusion molding that is commonly used in the respective fields of thermoplastic resins.

Whether the composition is melt-kneaded or molded during production, the temperature is higher than the melting point of the polymer used, but at a temperature that does not cause thermal decomposition. For these reasons, the temperature is generally 180 to 300°C (preferably 190 to 25°C).
0°C).

Generally, olefin polymers have extremely poor adhesion with polyurethane, so when applying polyurethane paint to molded products of olefin polymers or their compositions, it is necessary to first apply and dry a primer and then apply the polyurethane paint. Must be. However, since the propylene polymer composition of the present invention has excellent adhesion with polyurethane, polyurethane can be applied directly to the surface of the molded product without applying a primer to the surface of the molded product (primer The adhesion will be further improved if you use

EXAMPLES AND COMPARATIVE EXAMPLES The present invention will be explained in more detail by examples below.
It goes without saying that the technical scope of the present invention is not limited to these examples.

Note that physical property measurements in Examples and Comparative Examples were carried out as follows.

(i) Flexural modulus was measured according to ASTM 0790.

(1) Izot impact strength was measured according to ASTM D256.

(iii) Paint film adhesion strength was measured using a flat plate test piece (thickness 2 mm,
130 x 130 mm) was placed in the vapor of 1-1-lichloroethane for 30 seconds and thoroughly dried,
High urethane paint (manufactured by Nippon P Chemical Co., Ltd., product name R2
57, Solid) was applied to a dry thickness of 20 to 30 microns. After leaving it for about 15 minutes, a urethane paint (manufactured by Nippon B Chemical Co., Ltd., trade name: R266, Wasokar Top) was applied to a dry thickness of 30 to 40 microns, and dried at 90° C. for 30 minutes. Then, it was allowed to stand in a constant room temperature (temperature 23°C, humidity 65%) for 48 hours. The obtained coated material (test piece) was cut into 10 mm width pieces, and a part of the coating film (approximately 10 mm) was cut from the resin part of the test piece.
After forcibly peeling off the film, the remaining adhesion was tested using a tensile tester at a speed of 50 mm/min in the opposite direction (18
It was determined by tensile strength at 0 degrees) and measuring the peel strength.

(1v) For the weather resistance test, the flat test piece was 50 mm x 5
Cut into 3mm pieces and irradiate them using a Sunshine Weatherometer (manufactured by Suga Test Instruments) at a blank panel temperature of 83°C and rain conditions of 12 minutes/60 minutes, take them out at each irradiation time, and observe changes in the appearance of the samples. was observed, and the results are shown below.

◎: No change O: Slight chalking △: Cracking ×: Severe cranking (V) For the gloss test, the flat test piece was tested according to JIS K 715.
Measured according to 0.

In addition, the propylene polymer, modified propylene polymer, linear low-density ethylene copolymer, inorganic filler, stabilizer against heat, oxygen, or ultraviolet rays used in the examples and comparative examples, as well as their physical properties and production. The method is shown below.

(A) Propylene polymer ■ PP (A): Ethylene-propylene block copolymer with ethylene content of 6.0% (weight, same below) and VFR (1) of 10 g / 10 minutes ■ PP (B): Ethylene MFR+ at 8.5% content
Ethylene-propylene block copolymer where 11 is 100g/10min ■ PP (C): MFR with ethylene content of 10.1%
(1) Rikitsuki, 5 g/10 min ethylene-propylene block copolymer ■ PP (D): Propylene homopolymer with MFR (1
) is 10g / 10 minutes ■ PP (E): MFR with ethylene content of 3.1%
Ethylene-propylene random copolymer (B) modified propylene polymer with (1) of 13 g/10 min. Combined 85 parts by weight and Mooney viscosity (M L 1+4.100°C) is 20
Amorphous ethylene-propylene copolymer 15!1iff
1 part of 30fflff 1 part of 2-hydroxyethyl methacrylate and 0.7 parts by weight of 2.2''-bis(tertiary-butylperoxyisopropyl)benzene were pre-triblended for 5 minutes using a Henschel mixer. The resulting mixture was transferred to a vented extruder (diameter 6
5mm, cylinder temperature 160-200℃) (hereinafter referred to as "modified PPJ").
) was used.

(C) Linear ethylene copolymer LLD (A): Density 0.918 g/craSM
F R (212,0 g/10 min and main chain carbon 1oo
Ethylene-butene-1 conjugated LLD with 7 short-chain branched alkyl groups (ethyl groups) per o pieces (B): Density 0.921 g/c111.
V F R (2120 g/10 min and main chain carbon 100
Ethylene-butene-1 copolymer (D) inorganic filler having 6 short-chain branched alkyl groups (ethyl groups) per 0 pieces.As the inorganic filler, talc with an average particle size of 2.0 microns, average Calcium carbonate (CaCO3) with a particle size of 2.0 microns and wollastonite with an average particle size of 7.0 microns were used.

(E) Stabilizer Various stabilizers include bis(2,2,6,6-tetramethyl-4-piperidine sebacate (hereinafter referred to as stabilizer (1)), 2(3-tertiary-butyl- 5-methyl-2-hydroxyphenyl-5-chlorobenzotriazole (hereinafter referred to as stabilizer (2)) and tetra[methylene-3
-(3,5-di-tertiary-butyl-4-hydroxyphenyl)propionate comethane (hereinafter referred to as stabilizer (3)) was used.

Examples 1 to 12 and Comparative Examples 1 to 3 Stabilizers were added to propylene polymers, modified propylene polymers, and linear low-density ethylene polymers whose blending amounts are shown in Table 1 using a super mixer. Mixed for 5 minutes. Pellets (compositions) were manufactured by kneading each of the obtained mixtures using a vented twin-screw extruder (cylinder temperature: 180 to 200°C, diameter: 30 mm). Each pellet was molded into a 5 oz. plate (2II1 thick) using an injection molding machine.
130 x 130 mm), a specimen for measuring flexural modulus of elasticity, and a specimen for measuring Izot impact strength.

The flexural modulus, Izot FII impact strength (temperature 23° C.), weather resistance test, coating film adhesion strength, and gloss test of each specimen obtained were measured. The results are shown in Table 2.

From the results of the above Examples and Comparative Examples, the propylene polymer composition obtained by the present invention not only has excellent mechanical strength (flexural modulus, impact resistance), but also has excellent processability and gloss. It is clear that the adhesion with polyurethane is excellent.Furthermore, the most distinctive effect is that by adding stabilizers against heat, oxygen, and ultraviolet rays, an effect that can be called a synergistic effect is achieved. It is clear that it will be effective.

Examples 13 to 26 and Comparative Examples 4 to 6 Propylene polymers, modified propylene polymers, linear low-density ethylene polymers, inorganic fillers, and stabilizers whose respective blending amounts are shown in Table 3. The formulations were mixed for 5 minutes using a Supermixer.

Pellets (compositions) were manufactured by kneading each of the obtained mixtures using a vented twin-screw extruder (cylinder temperature: 180 to 200°C, diameter: 30 mm). Each pellet was molded into a flat plate (2 mm thick, 130 mm thick) using a 5 oz injection molding machine.
x 130 mm), a specimen for measuring the flexural modulus of elasticity, and a specimen for measuring the Izod impact strength. The flexural modulus and Izod impact strength (temperature 23
℃), gloss test, weather resistance test, and coating film adhesion strength were measured. The results are shown in Table 4.

From the results of the above Examples and Comparative Examples, the propylene polymer composition obtained by the present invention not only has excellent mechanical strength (flexural modulus, impact resistance), but also has good processability and gloss. Furthermore, it is clear that the adhesion to polyurethane is also excellent. Furthermore, it is clear that the most characteristic effect is that by adding stabilizers against heat, oxygen, and ultraviolet rays, an effect that can be called a synergistic effect is exerted.

Effects of the Invention The propylene polymer composition obtained by the present invention has the following margins:
It exhibits the following effects compared to conventional propylene polymer compositions.

(1) Workability and moldability are the same or better.

(2) Weather resistance is good due to the synergistic effect described above.

(3) It has excellent adhesion with polyurethane paint, and by applying the polyurethane paint to the surface, the step of undercoating the primer can be omitted.

(4) Generally practiced activation treatment methods (for example,
By applying corona discharge treatment, plasma treatment, ultraviolet treatment) to the surface of the molded product, it is possible to achieve a satisfactory level of adhesion with the polyurethane paint.

The propylene polymer composition of the present invention can be used in a wide variety of ways in order to exhibit the above-mentioned effects. Typical applications include exterior OR products such as automobile bumpers and bumper corners, interior parts such as door liners, and motorcycle parts such as fenders.

Claims (1)

[Scope of Claims] 1. (A) Propylene polymer, (B) (1) Propylene polymer or mixture of propylene polymer and ethylene-propylene copolymer rubber 1
00 parts by weight with (2) 0.1 to 50 parts by weight of an organic compound having at least one unsaturated bond in the molecule and containing a hydroxyl group and (3) 0.01 to 20 parts by weight of an organic peroxide. A modified propylene polymer obtained by the treatment, and (C) a density of 0.900 g/cm^3 or more and 0.935 g
/cm^3, the melting point is 106 to 130°C, the melt index is 0.01 to 100 g/10 min, and the number of side chain alkyl groups having substantially 1 to 10 carbon atoms is the main chain. A composition consisting of a linear low density ethylene copolymer having 3 to 35 carbon atoms per 1000 carbon atoms, and the composition ratio of component (C) in the composition is 3 to 25% by weight.
The composition ratio of components (A) and (B) to the total composition is 15% by weight or more and 5 to 50% by weight, respectively, and the composition ratio of components (B) and (2) to the total composition is 0. 01 to 10% by weight of a propylene polymer composition. 2. (A) Propylene polymer, (B) (1) Propylene polymer or mixture of propylene polymer and ethylene-propylene copolymer rubber 1
00 parts by weight with (2) 0.1 to 50 parts by weight of an organic compound having at least one unsaturated bond in the molecule and containing a hydroxyl group and (3) 0.01 to 20 parts by weight of an organic peroxide. A modified propylene polymer obtained by processing (C) a density of 0.900 g/cm^3 or more and 0.935 g
/cm^3, the melting point is 106 to 130°C, the melt index is 0.01 to 100 g/10 min, and the number of side chain alkyl groups having substantially 1 to 10 carbon atoms is the main chain. A composition consisting of a linear low-density ethylene copolymer having 3 to 35 carbon atoms per 1000 carbon atoms, and (D) an inorganic filler, the component (A) occupying in the composition.
, (B), (C) and (D), respectively,
15% by weight or more, 5-50% by weight, 3-25% by weight and 2-40% by weight, and the component (B
) A propylene polymer composition in which the composition ratio of (2) is 0.01 to 10% by weight.