JPS59184247A - Olefin polymer mixture - Google Patents

Abstract

PURPOSE:To provide the titled mixture which has excellent adhesiveness and gives moldings having good rigidity and freed from the problem of warpage, by mixing a hydroxyl group-contg. compd., an org. peroxide, glass fiber and fine mica powder with an olefin polymer. CONSTITUTION:The titled mixture comprising an olefin polymer (A), an org. compd. (B) having an OH group and an unsaturated bond per molecule (e.g. 3- hydroxy-1-propene), an org. peroxide (C), glass fiber (D) and mica (E) having an average particle size of 1-100mu, wherein each of components D and E accounts for 5-40wt% of the combined quantity of component A, D and E, and component A accounts for at least 40wt% of the combined quantity of component A, D and E, and the quantity of component B is 0.1-50pts.wt. and that of component C is 0.01-20pts.wt. per 100pts.wt. of the combined quantity of components A, D and E. The mixture gives moldings having good rigidity and free from the problem of warpage, and exhibits very excellent adhesion in coating, bonding and laminating the moldings.

Description

[Detailed description of the invention] [D. Purpose of the invention The present invention relates to olefinic polymer mixtures.

More specifically, a captive olefin polymer, (B) an organic compound having at least one unsaturated bond in the molecule and containing a hydroxyl group, (C) an organic peroxide,
This relates to an olefinic polymer mixture consisting of glass fiber and [F] mica tertiary amine compound, which has extremely excellent adhesive properties when making painted products, adhesives, and laminates of its molded products. Rather, the object is to provide a mixture that provides molded products with good rigidity and improved warpage.

Background of the Invention As is well known, olefin resins not only have excellent moldability but also have good properties such as mechanical strength, heat resistance, solvent resistance, and chemical resistance, so they are widely used industrially. It is manufactured and used in many fields as a general-purpose resin. However, since olefin resins do not have polar groups in their molecules (so-called non-polar), they are chemically extremely inactive polymeric substances. Furthermore, it not only has high crystallinity but also extremely low solubility in solvents, so when used in fields such as painting and adhesion, its paintability and adhesiveness are extremely low.

As mentioned above, although olefin resins have excellent moldability and the above-mentioned properties, olefin resins are used in fields where good adhesion and paintability are required (for example, automobile parts and home appliance parts). The use of resin naturally had its limitations.

In order to solve the problems of adhesion and paintability of olefin resins, various methods as described below have been proposed for quite some time.

(a) A method in which an olefin resin or a molded product thereof is surface-treated from the outside and modified by a physical or chemical method (hereinafter referred to as "modification method").

(b) A method of adding other polymeric substances or additives to the olefin resin.

Hereinafter, among these methods, the denaturation method will be roughly explained in detail, and intermediate points will be described.

This method includes ``flame treatment method, plasma treatment method, ozone treatment method, corona discharge treatment method, and irradiation treatment method using purple'1. rays or electron beams'' [hereinafter referred to as ``denaturation method'').
a)] and ``a method of treatment using a mixed solution of chromic acid and a mineral acid such as concentrated sulfuric acid, and a method of treating an olefin resin or its molded product with a compound containing a polar group in the presence or absence of a crosslinking agent. A method of chemical treatment such as grafting in the presence of
can be given.

These modification methods provide chemically active sites rich in polar groups to the surface of the olefin resin or its molded product, and also physically roughen the surface. As a result, it is thought that the effects of improved paintability and adhesiveness can be obtained.

However, in order to carry out this modification method (a), the shape of the molded object to be treated is significantly limited, and furthermore, not only is the treatment effect significantly reduced over time by leaving it after the treatment, but also the In many cases, the degree of oxidation is not always sufficient. Moreover, it has the disadvantage of being economically disadvantageous because it requires various expensive processing equipment.

In addition, among the modification methods (b), the treatment method using mineral acids not only tends to cause the chemicals used to be a source of pollution, but also requires extensive post-treatment steps such as neutralization, water washing, and drying. It is. Furthermore, even chemical treatment methods such as grafting require a drying process, require careful consideration of monomer application, grafting atmosphere, etc., and require a relatively long grafting reaction time. . Therefore, it has drawbacks such as not being suitable for continuous production.

As mentioned above, although it is possible to improve paintability and adhesion to some extent with modification methods, it is difficult to say that these methods are satisfactory improvement methods because they have various drawbacks.

Furthermore, as a method for imparting paintability and adhesive properties to the surface of molded products made from olefinic polymers, polyolefins are prepared by graft polymerizing chlorinated polypropylene or maleic anhydride onto the surface of the molded product before applying paint or adhesive properties. A method has been developed to apply a brimer containing as the main ingredients.

However, the method of applying a primer increases the cost by adding one step of coating or adhesion.

Including the above, olefinic polymers, modified products and mixtures thereof that do not impair the properties and processability of olefinic resins and have good adhesion and coating properties have yet to be developed. Structure of the Invention In view of the above, the present inventors have conducted various searches to produce olefin polymers and olefin polymer mixtures with excellent paintability and adhesive properties, and as a result, they have developed an olefin polymer (B). "Having at least one unsaturated bond in the molecule,
and a hydroxyl group-containing compound (hereinafter referred to as "hydroxyl compound"); C) an organic peroxide; The mixing ratio of glass fiber in the total amount of olefin polymer, glass fiber and mica is 5 to 40% by weight, and the mixing ratio of mica is 5 to 40% by weight, or the mixing ratio of olefin polymer is 5 to 40% by weight. is at least 40%, and the total amount of olefinic polymers, glass fibers and mica is 10%.
The mixing ratio of the hydroxyl compound to 0 parts by weight is 01 to 50% by weight, and the organic peroxide is 0.01% by weight.
The present invention was achieved by discovering that an olefin-based polymer mixture containing up to 20% by weight does not have the above drawbacks and adheres strongly to paints regardless of the type.

11\li Effects of the Invention The use of the mixture according to the present invention provides the following effects.

(1) An excellent coating or adhesive can be obtained without carrying out the above-mentioned modification of the surface as conventionally done.

(2) Since a paint having an incyanate group can be applied directly to the surface of a molded product without applying a brimer in advance, a coated product with good oil resistance can be obtained.

(3) It is the best as a core material for various parts that require high rigidity and shape stability, and by applying the above coating, it has good oil resistance and high rigidity and shape stability. It is possible to obtain a molded product that has both the following properties.

The mixture obtained according to the present invention can be used in a wide variety of ways to achieve the above-mentioned effects.

Typical usage examples are shown below.

(1) Automotive parts such as bumpers, instrument panels, armrests, door liners, seat hacks, duct covers, etc. (2) Home appliance parts such as the interior and exterior of coolers and refrigerators (3) Housing materials such as loop panels and insulation walls (4) Daily necessities, furniture such as dining tables, desk surfaces, furniture panels, kitchen cabinets, ice boxes, etc. (5) Freezer members 1v such as interior materials for refrigerated trucks and freezer walls Detailed description of the invention (5) Olefin-based heavy Olefin polymers used in the present invention include ethylene homopolymers, propylene polymers, random or block copolymers of ethylene and propylene, and ethylene and/or propylene polymers having at most 7 carbon atoms. Examples include random or block copolymers with other olefins (copolymerization ratio of α-olefin is at most 20%). The molecular weight of these olefin polymers is generally from 20,000 to 10,000, preferably from 20,000 to 500,000, and particularly preferably from 50,000 to 300,000. Also, low density (0,90
0j;/'/cur) to high density (0,980,17
/cr! Preferred are ethylene homopolymers, propylene homopolymers, random or block copolymers of ethylene and propylene, and random or block copolymers of ethylene or propylene with other α-olefins.

These olefin polymers are produced by using a catalyst system (so-called Ziegler catalyst) obtained from a transition metal compound and an organoaluminium compound, and by supporting a chromium compound (for example, chromium oxide) on a carrier (for example, silica). The resulting catalyst system (so-called Phillips catalyst) or radical initiator (e.g. organic peroxide)
It can be obtained by homopolymerizing or copolymerizing olefins using.

Furthermore, the present invention also includes modified polyolefins obtained by graft polymerizing a compound having at least ] double bonds (for example, an unsaturated carboxylic acid, a vinyl silane compound) to these olefin polymers.

The production methods for these olefin polymers and modified polyolefins are well known.

These olefin polymers and modified polyolefins may be used alone or in combination of two or more. Furthermore, two or more of these olefin polymers and modified polyolefins may be used as a resin blend in any proportion.

(B) Hydroxyl compound The hydroxyl compound used in the present invention has at least one unsaturated bond (double bond, triple bond),
and is a compound containing a hydroxyl group. Typical examples include alcohols with double bonds, alcohols with triple bonds, esters of -valent or divalent unsaturated carboxylic acids and unsubstituted dihydric alcohols, and unsaturated carboxylic acids and unsubstituted trihydric alcohols. Esters with alcohols, esters with unsubstituted tetrahydric alcohols, and unsubstituted pentahydric alcohols
Examples include esters with alcohols.

As a typical example, the general formula is represented by the following formula [(■) formula].

In formula (I), R1 and R2 may be the same or different, and are a hydrogen atom or a hydrocarbon group having 1 to 24 carbon atoms.

A typical example of a desirable alcohol having a triple bond is one whose general formula is represented by the following formula [Formula (Ll)].

(R3-c=c-R4+OH(II) In formula (6), R3 and may be the same or different, and are a hydrogen atom or a hydrocarbon group having 1 to 24 carbon atoms.

Further, the ester of an unsubstituted dihydric alcohol and an unsaturated carboxylic acid is an ester of a monovalent unsaturated carboxylic acid and an unsubstituted dihydric alcohol, and a typical example of a preferable one is the general formula shown below. It is expressed by the following formula.

(In formula 111, R' is an unsaturated hydrocarbon group having 2 to 24 carbon atoms, and preferably a hydrocarbon group having 2 to 24 carbon atoms.

Furthermore, the ester of an unsubstituted trihydric alcohol and an unsaturated carboxylic acid is an ester of a monovalent unsaturated carboxylic acid and an unsubstituted trihydric alcohol, and a typical example of a desirable one is the general formula [■ It is shown by the following formula.

(In formula M, R7 is an unsaturated hydrocarbon group having 2 to 24 carbon atoms, and R8 is a hydrocarbon group having 2 to 24 carbon atoms.

In addition, the ester of an unsubstituted tetrahydric alcohol and an unsaturated carboxylic acid is an ester of a monovalent unsaturated carboxylic acid and an unsubstituted tetrahydric alcohol, and a typical example of a preferable one is the general formula of the following formula [Formula ].

In formula M, R9 is an unsaturated hydrocarbon group having 2 to 24 carbon atoms, and R'' is a hydrocarbon group having 2 to 24 carbon atoms.

Further, the ester of an unsubstituted trihydric or higher alcohol and an unsaturated carboxylic acid is an ester of a monovalent unsaturated carboxylic acid and an unsubstituted trihydric or higher alcohol, and a typical example of a desirable one is the general formula: It is expressed by the following formula [M formula].

■In the formula, n is 4 or more, and R'' has 2 carbon atoms.
~24 unsaturated hydrocarbon groups, and R12 is a hydrocarbon group having 2 to 60 carbon atoms.

-1 Other esters include esters of unsaturated dihydric carboxylic acids and unsubstituted polyhydric alcohols, and a typical preferred example is one whose general formula is represented by the following formula [formula (b)]. Things can be given.

)1 1 (In formula 11, m is 1 or more, R1'' is an unsaturated hydrocarbon group having 2 to 50 carbon atoms, and R'' is a hydrocarbon group having 2 to 100 carbon atoms. .

Representative examples of these hydroxyl compounds include Japanese Patent Application Nos. 57-36502 and 57-491;
065 @, cb each”A 1111 m ft 6
U&. ``Existing "1" Substance Document Book'' (Kagaku Kogyo Nippo, published in 1974) Supervised by the Chemical Safety Division, Basic Industries Bureau, Ministry of International Trade and Industry, 2nd edition, pages 25, 27 to 2
8, pages 50 to 55, and pages 57 to 58.

Among the hydroxyl compounds used in the present invention,
Representative examples of suitable ones include 3-hydroxy-]-propene, 4-hydroxy-1-butene, cis-4-hydroxy-2-butene, trans-4-hydroxy-2-butene,
butene, 3-hydroxy-2-methyl-1-propene,
cis-5-hydroxy-2-pentene, trans-5-
Hydroxy-2-pentene, cis-1,4-dihydroxy-2-butene, trans-1,4-dihydroxy-2
-Butene, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl acrylate-1., 3-hydroxypropyl methacrylate, 2-hydroxyethyl crotonate, 2,3,4
, 5.6-pentahydroxyhexyl acrylate), 2
, 3,4°5.6-pentahydroxyhexyl methacrylate, 2,3,4.5-tetrahydroxypentyl acrylate and 2,3,4.5-tetrahydroxypentyl methacrylate.

C) Organic peroxide Furthermore, the organic peroxide used in the present invention is generally used as an initiator in radical polymerization and a crosslinking agent for polymers, and has a half-life of 1 minute.
The temperature is preferably 130°C or higher, particularly 130°C or higher. If the above-mentioned humidity is below 100'C, it is not only difficult to handle, but also the effect of using it is not very noticeable, so it is not desirable. Representative examples of preferred organic peroxides include ], ]1-bis-tertiary-butylperoxy3.3.5-trimethylcyclohexane and other ketone peroxides; dicumyl peroxide and other dialkyl peroxides;2. Hydroperoxides such as 5-dimethylhexane-2,5-hydroperoxide, diacyl peroxides such as benzoyl peroxide and 2,5-dimethyl-2,5-
Examples include dihenzoyl peroxyhexane/gu-oxy esters.

0 Glass fiber Also, the glass fiber used in the present invention is
Usually the single fiber diameter is 05 to 20 microns, especially 0.5
Those with a diameter of 15 to 15 microliters are preferable.

It is not desirable to use glass fibers with a single fiber diameter of less than 0.5 microns because they may break during kneading and molding. On the other hand, if the diameter exceeds 20 microns, it is difficult to improve the rigidity of the resulting mixture, which is not preferred.

In addition, the cut length is generally 0.03 to 151 m,
Particularly desirable is one with 0.05 to 10 lessons. It is undesirable to manufacture the mixture using unweighed glass fibers with a cut diameter of 0.03 mz because it is difficult to improve the stiffness of the resulting mixture. On the other hand, if the diameter exceeds 15 mm, it is not preferable because it may break during kneading and molding.

The glass fiber used in the present invention is generally widely used as a filler or reinforcing agent in the rubber industry and synthetic resin industry, and it may be combined with vinyl acetate resin, silane thread compound, or titanate compound. Those subjected to coupling treatment can also be used. In addition, so-called milled glass fibers produced by grinding these glass fibers can also be used.

Mica The mica used in the present invention is a naturally occurring platy mineral, and although its composition is complex, it is mainly composed of muscovite, phlogopite, and biotite. The average particle size is between 1 and 100 microns, preferably <1 and between 1 and 50 microns, especially between 2 and 50 microns. Producing the mixture with mica having a particle size less than 1 micron reduces the scratch resistance and stiffness of the mixture. On the other hand, if a molded article is manufactured using a mica having a diameter exceeding 100 microns, the mica in the resulting molded article is likely to peel off and weld lines will be noticeable, which is undesirable in either case. Further, the aspect ratio is preferably 10~], OO, ]0~7o, particularly 20~7o.
o is preferred.

If mica with an aspect ratio of less than 10 is used to produce the mixture, the resulting mixture will have reduced scratch resistance and stiffness. On the other hand, if mica exceeding 100 mm is used for molding, peeling of the mica in the resulting molded product may occur.
In addition, weld lines are noticeable, which is not preferable in either case.

(Fl Mixing ratio In producing the mixture of the present invention, the mixing ratio of glass fiber in the total amount of olefin polymer, glass fiber and mica is 5 to 40% by weight,
-35% by weight is preferred, particularly ], o - 35% by weight. If the mixing ratio of glass fiber in the total amount of olefin polymer, glass fiber, and mica is less than 5% by weight, the stiffness of the resulting mixture cannot be improved. On the other hand, if the amount exceeds 40% by weight, the moldability will be poor when producing a molded product, and even if a molded product is produced, the appearance of the carved product will be poor.
Not.

The total amount of olefin polymer, glass fiber, and mica used is 5 to 40% by weight, preferably 5 to 35% by weight, especially 10 to 35% by weight.
35% by weight is preferred.

If the mixing ratio of mica in the total amount of the olefin polymer, glass fiber, and mica is less than 5%, the rigidity of the resulting mixture cannot be improved.

On the other hand, if the amount exceeds 40% by weight, moldability will be poor when producing a molded product, and even if a molded product is produced, the appearance of the molded product will be poor.

In general, the mixing ratio of the olefin polymer in the total amount of the olefin polymer, glass fiber and mud is at least 40% by weight, preferably 45% by weight or more, and particularly preferably 2% by weight or more of 50% by weight. . If the mixing ratio of the olefin polymer to the total amount of the olefin polymer, glass fiber, and mica is less than 40% by weight, it is difficult to produce a homogeneous mixture, and even if a homogeneous mixture is obtained. However, when producing the mixture of the present invention, the mixing ratio of the hydroxyl compound to 100 parts by weight of the total amount of the olefin polymer, glass fiber, and ma.r. force is 0.1.
~50 parts by weight, preferably 02 to 30 parts by weight, particularly preferably 03 to 20 parts by weight. If the mixing ratio of the hydroxyl compound to 100 parts by weight of the olefin polymer, glass fiber, and marker is less than 0.1 parts by weight, the effect of improving adhesion is insufficient. On the other hand, even if 50 parts by weight or more is used, the effect of improving adhesion depending on the amount used is not observed, and rather the original properties of the olefin polymer are impaired, which is not preferable.

In addition, the mixing ratio of the organic peroxide to the total amount of the olefin polymer, glass fiber, and mica is 0.01 to 20 parts by weight, and is 0.05 to 1.0 parts by weight.
0 parts by weight is desirable, and 01 to 7 parts by weight is especially suitable. If the mixing ratio of organic peroxide to 100 parts by weight of olefin polymer, glass fiber, and mica is less than 1,001 parts by weight, the adhesion improvement effect will not only be low but also the durability of the adhesion strength of the mixture will be reduced. also decreases.

On the other hand, if the amount exceeds 20 tons to 111 parts, the inherent mechanical properties of the polymer deteriorate, which is not desirable in any case.

(G) Production of mixture and molded product To produce the mixture of the present invention, an olefinic polymer,
The hydroxyl compound, organic peroxide, glass fiber, and mica may be uniformly mixed within the above mixing ratio range. In producing this mixture, a part of the mixed components is mixed in advance to produce a so-called master bunch, and this masterbatch and the remaining mixed components are produced to produce a mixture having the above-mentioned blended components. You may.

Further, the mixture may be composed of an olefin polymer, a hydroxy compound, an organic peroxide, glass fiber, and mica, but depending on the purpose of use of the mixture, these mixed components may be further supplemented with oxygen, heat, and ultraviolet rays. Additives such as stabilizers, metal deterioration inhibitors, flame retardants, colorants, electrical property improvers, fillers, antistatic agents, lubricants, processability improvers, and tack improvers can be added to the present invention. They may be mixed as long as the desired properties of the mixture are not impaired.

This mixture may be prepared by triblending using mixers commonly used in the olefinic polymer industry such as Henschel mixers, Banbury mixers, Niegoos, roll mills, and screw extruders. It can also be produced by melt-kneading using a mixer. At this time, a more homogeneous mixture can be obtained by roughly triblending and further melting and mixing the resulting mixture.

In the case of the above melt-kneading, if carried out at a high temperature, the olefin polymer may deteriorate. However, it must be carried out at a temperature at which the organic peroxide used to graft polymerize the olefin polymer and hydroxy compound is decomposed. From the above, this melt-kneading is generally carried out at a temperature of 1.60 to 300°C, although it varies depending on the type of organic peroxide used.

Various molded products may be produced from the composition thus produced by processing methods commonly used in the field of olefin polymers, such as extrusion molding, injection molding, and press molding.

At this time, it is necessary to carry out the process at a temperature higher than the temperature at which the composition (graft material) obtained in step 1 above melts. However, if the temperature is too high, the olefin polymer may deteriorate, so it goes without saying that the process must be carried out at a humidity below which does not cause decomposition.

0-handed Coating method: By uniformly applying a paint having an incyanate group to the surface of the molded product obtained as described above to a thickness of 1 to 500 microns (when dry). The purpose of the present invention can be achieved. There is no special method C for application; any method commonly used on the surface of metal or synthetic resin moldings can be applied. Typical methods include application with a spray gun, application with a brush, etc. Examples include a coating method and a method of applying using a roll coater.

According to the present invention, it is possible to obtain a molded article that not only has excellent adhesion and gloss on the coated surface, but also has excellent weather resistance and gasoline resistance, such as in the case of urethane coating, so it is possible to obtain automotive parts. It can be applied to nato.

It is also suitable for metallizing, laminating different materials, etc. on the applied coating film having incyanate groups.

Incidentally, in performing the above-mentioned coating, in the conventional method, the surface of the molded article may be cleaned or degreased in the previous step. The main purpose of this is to remove surface stains caused by oils and fats, eliminate variations in adhesion, and further improve adhesion. Specific examples include wiping off using an organic solvent such as isopropyl alcohol, toluene, or trichlene; or, for large molded products, immersing the product in a humidified organic solvent or treating it with heated steam. It will be done. These degreasing and cleaning steps can be similarly applied to the molded product obtained according to the present invention. Furthermore, it does not require any form of tube, and the same effects as conventional ones can be expected.

-p Examples and Comparative Examples The present invention will now be explained in more detail with reference to Examples.

In addition, in the examples and comparative examples, the melt index (hereinafter referred to as "M, 1.J") is JISK-676.
According to 0, the temperature is 190°C and the load is 2.1'
Measurement was carried out under the condition of 6 kg. In addition, the Melt Flow Index (hereinafter referred to as JMFIj) is
-6758, at a temperature of 230°C and a load of 2.1'6 k17. In addition, for the paint film peeling strength test, a strip of 10 mm in width is cut out from the test piece, and a portion of the paint film is forcibly peeled off from one end of the test piece, which is used in tensile tests of plastics, etc. The coating film was peeled off using a tensile tester under the conditions of a tensile speed of 501 m/min, a peeling angle of 180 degrees, and a temperature of 20°C.
). Furthermore, gasoline resistance was determined by making a cross cut on the coating surface with an NT cutter at an angle of 30 degrees, and immersing each test piece in gasoline at room temperature (approximately 20°C) for 24 hours. Observed changes. For water resistance, cross-cuts were made in the same manner as the gasoline resistance test pieces, and after each test piece was immersed in 40'C water for 240 hours, changes in the coating surface were observed. Further, warpage was evaluated by forming a disk having a thickness of 2.3 mm and a diameter of 125 mm with a center gate having a diameter of 1+++ m, and measuring the maximum amount of deformation.

In the Examples and Comparative Examples, the following ingredients were used, such as an olefin polymer, glass fiber, hydroxy compound, organic peroxide, and mica.

[Propylene homopolymer]

The olefin polymer has a density of 0,900 g/d and an IVjFI of 4. (1/10 min.

[Block propylene copolymer] Also, as an olefin polymer, the ethylene content is 1
Propylene with a weight of 20%, an MFI of 2.0,9710 minutes, and a density of 90g/cra.
An ethylene block copolymer (hereinafter referred to as PP(2)J) was used.

[High-density ethylene homopolymer]

1 Furthermore, as an olefin polymer, the density is 09Ag/c
rrt, KatsuM, 1. is 1. A high-density ethylene homopolymer (hereinafter referred to as [-HDPEJ) with Qg/10 minutes was used.

[Hydroxyl thread compound]

As hydroxyl thread compounds, 2-hydroxyethyl acrylate [hereinafter referred to as "compound prisoner"], 2-hydroxypropyl methacrylate [hereinafter referred to as [compound (B)]], and 3,6-dimethyl-4-octyne-3,6-diol [Hereinafter, "compound (referred to as QJ")] was used.

[Organic peroxide]

i As organic peroxides, benzoyl peroxide [hereinafter referred to as JBPCJ] and dicumyl peroxide [
Hereinafter, [referred to as DCPJ] was used.

[Glass fiber]

The glass fiber has a single fiber diameter of 11 microns and a cut length of 3 mm (hereinafter referred to as [GF
J) was used.

[Mica]

As mica, mica having an average particle size of 7 microns and an aspect ratio of 30 was used.

Examples 1 to 9, Comparative Examples 1 to 9 The ingredients whose amounts are shown in Table 1 were mixed in advance for 10 minutes using a super mixer. Pellets were manufactured by kneading each of the obtained mixtures using a vented extruder (diameter 50 mm). Each pellet obtained was injection molded using a 5 oz injection molding machine at a temperature of 230°C to form a flat specimen (120 x 150.m
+ m, thickness 2 inches).

A two-component urethane paint (manufactured by Nippon P Chemical Co., Ltd., trade name R-257) was applied to one side of each specimen thus obtained using a spray gun to a thickness of 35 to 40 microns for a paint film peeling test. I sprayed it. Then, it was heated and dried at a temperature of 90'C for 30 minutes. 1 at room temperature
After being left for day and night, the coating film of each sample was tested for peel strength and measured for flexural modulus and warpage. The results are shown in Table 2. Furthermore, each was tested for gasoline resistance and water resistance. The results are shown in Table 2. In addition, in these tests, the state of change in the coating film is shown below.

○ No change at all, △ Partial peeling, × Fully peeling Table 2 (Part 1) Table 2 (Part 2) Each of the mixtures obtained in Comparative Examples 7 to 9 was molded in the same manner as in Example 1. Izu Kawara tried to manufacture molded objects, but was unable to do so.

Comparative Example 10 60 parts by weight of PP(1,), 20 parts by weight of OF and 2
A composition containing 0 parts by weight of mica was injection molded in the same manner as described above to produce a flat specimen. A thermosetting polypropylene primer (manufactured by Nippon P Chemical Co., Ltd., trade name RB-291, ■Primer) was applied to one side of this specimen in advance.
was sprayed uniformly using a spray gun to a film thickness of 13 to 15 microns, and then heated to a temperature of 90°C for 3
Heat drying was performed for 0 minutes. Next, a two-component urethane paint was applied to this primer-coated surface in the same manner as above, and 90%
Heat drying was performed for 30 minutes at a temperature of °C. The peel strength of this coating was 170. ! It was 9/1 Z711.

A water resistance test was conducted, but no change was observed in the paint film. However, gasoline resistance test) fc
When this was done, the paint film completely peeled off.

Applicant: Showa Denko Co., Ltd. Agent: Patent attorney Sei Kikuchi

Claims (1)

[Scope of Claims] Olefinic polymers, (B) organic compounds having at least one unsaturated bond in the molecule and containing a hydroxyl group, C) organic peroxides CD) glass fibers and ( g) It is a mixture consisting of mica having an average particle size of 1 to 100 microns, and the mixing ratio of glass fiber to the total amount of the olefin polymer, glass fiber and mica is 5 to 40% by weight; The mixing ratio of olefinic polymer is 5 to 40% by weight, but the mixing ratio of olefinic polymer is at least 40% by weight, and the mixture of olefinic polymer, glass fiber and mica @IH1oo
The olefin polymer mixture has a mixing ratio of 0.1 to 50 parts by weight of the organic compound containing a hydroxyl group and 0.01 to 20 parts by weight of the organic peroxide.