JPH04300933A - Polymer composition - Google Patents

Abstract

PURPOSE:To provide the subject polymer composition composed of a specified alpha-olefin random copolymer, propylene homopolymer and a copolymer between propylene and another alpha-olefin and showing an excellent bond strength to a metal and a polyamide resin, etc. CONSTITUTION:An objective composition containing (A) an alpha-olefin random copolymer (random copolymer between propylene and another alpha-olefin, containing 1-5mol% above-mentioned other olefin except propylene based on total molar number between propylene and other alpha-olefin) modified by an unsaturated carboxylic acid or its derivative, (B) a propylene homopolymer and/or copolymer between propylene and another alpha-olefin and (C) an ethylene-based resin in an amount of <=100 pts.wt. based on 100 pts.wt. total weight between 0.05-30wt.% (A) and 70-99.95wt.% (B).

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION This invention relates to polymer compositions. For more details, please refer to metal, polyamide resin or ethylene/
The present invention relates to an α-olefin polymer composition that exhibits excellent adhesion to saponified vinyl acetate copolymers and the like at relatively low temperatures.

0002

[Prior Art] Conventionally, propylene homopolymers graft-modified with unsaturated carboxylic acids or derivatives thereof have been used as adhesives for metals, polyamide resins, saponified products of ethylene/vinyl acetate copolymers, etc. . However, such graft-modified propylene homopolymers can only exhibit sufficient adhesive strength at relatively high temperatures such as 160°C or 200°C;
Adhesion operations using it had difficulties associated with high temperatures.

0003

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel polymer composition.

Another object of the present invention is to bond metals, polyamide resins or ethylene/vinyl acetate at relatively low temperatures, such as 140°C, which is 20 to 40°C lower than the temperature at which conventional adhesives develop sufficient adhesive strength. The present invention relates to a novel polymer composition that can exhibit adhesive strength that is fully satisfactory for saponified copolymers and the like.

Further objects and advantages of the invention will become apparent from the following description.

[0006]

According to the present invention, the above objects and advantages of the present invention basically consist of (A) an α-olefin random copolymer modified with an unsaturated carboxylic acid or a derivative thereof; Here, the α-olefin random copolymer consists of propylene and other α-olefins in which the α-olefin other than propylene accounts for 1 to 5 mol% based on the total number of moles of propylene and other α-olefins.
is a random copolymer with an olefin, and (B)
Contains a propylene homopolymer and/or a copolymer of propylene and other α-olefins,
and (C) based on the total weight of components (A) and (B), component (A) is 0.05 to 30% by weight and (
This is achieved by a polymer composition characterized in that component B) accounts for 70 to 99.95% by weight.

In the above polymer composition of the present invention, (A
) component is an α-olefin random copolymer modified with an unsaturated carboxylic acid or a derivative thereof.

Examples of unsaturated carboxylic acids or derivatives thereof include acrylic acid, maleic acid, fumaric acid,
Tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, nadic acid
Unsaturated carboxylic acids such as bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid); or derivatives thereof such as acid halides, amides, imides, anhydrides, esters, etc.

Specific examples of such derivatives include maleyl chloride, maleimide, maleic anhydride, citraconic anhydride, monomethyl maleate, dimethyl maleate,
Examples include glycidyl maleate. Among these, unsaturated dicarboxylic acids or their acid anhydrides are preferred, and maleic acid, nadic acid (R), or their acid anhydrides are particularly preferably used.

The α-olefin random copolymer before modification is composed of propylene and α-olefins other than propylene, in which α-olefins other than propylene account for 1 to 5 mol% based on the total number of moles of propylene and α-olefins other than propylene. - Random copolymers with olefins.

As the α-olefin other than propylene, α-olefins having 2 and 4 to 20 carbon atoms are preferably used.

Examples of such α-olefins include ethylene, 1-butene, 1-hexene, 4-methyl-1-
Examples include pentene, 1-octene, 1-decene, 1-tetradecene, and 1-octadecene. These α−
The olefins may be used alone or in combination of two or more.

[0013] The α-olefin may be used in an amount of 1 to 1 based on the total number of moles with propylene constituting the random copolymer.
It accounts for 5 mol%, preferably 2 to 4.5 mol%.

If the number of moles of α-olefin is less than 1 mol %, adhesive properties at low temperatures (for example, 140° C.) will not be exhibited, and if it exceeds 5 mol %, blocking will occur due to variations, making it impossible to put it to practical use.

The α-olefin random copolymer (A) modified with an unsaturated carboxylic acid or a derivative thereof is preferably 0.01 to 10% by weight, based on the α-olefin random copolymer before modification. More preferably 0.1
Graft-modified with ~5% by weight of unsaturated carboxylic acid or its derivative.

The above component (B) is a propylene homopolymer or a copolymer of propylene and other α-olefins. As α-olefins other than propylene,
The same compounds as those described for component (A) above are preferably used. The α-olefin other than propylene in the copolymer preferably accounts for 5 mol% or less based on the total number of moles of propylene and the α-olefin. More preferably, the α-olefin accounts for 4.5 mole percent or less on the same basis.

The polymer of component (B) preferably has an MFR (230° C. -2160 g) of 0.1 to 100 g/
10 minutes, more preferably MFR (same) 0.3-50g/
Indicates 10 minutes.

In the above polymer composition of the present invention, (A
) component and (B) component based on their total weight,
Component (A) is 0.05 to 30% by weight, preferably 0.1
70-99.95% by weight, preferably 80-9
It accounts for 9.9% by weight.

If the amount of component (A) is less than 0.05% by weight, no adhesive properties will be exhibited, and if it exceeds 30% by weight, the strength of the composition will decrease and it will become brittle, resulting in poor adhesion and no practical use. .

According to the research conducted by the present inventors, particularly excellent adhesive strength can be obtained by further containing an ethylene resin in the composition of the present invention in addition to the above-mentioned components (A) and (B). It became clear that

Therefore, according to the present invention, the above (
In addition to component A) and component (B), it further contains (D) an ethylene resin, and based on the total weight of component (A) and component (B), component (A) is 0.05 to 30%. % by weight, and component (B) accounts for 70 to 99.95% by weight, and component (D) is contained in an amount of 100 parts by weight or less per 100 parts by weight of the total weight of components (A) and (B). Also provided are featured polymer compositions.

As the ethylene resin (D), an ethylene homopolymer or a random copolymer of ethylene and an α-olefin other than ethylene is advantageously used.

As the α-olefin other than ethylene, α-olefins having 3 to 20 carbon atoms are preferably used.

Examples of such α-olefins include propylene, 1-butene, 1-hexene, 4-methyl-1
-pentene, 1-octene, 1-decene, 1-tetradecene, 1-octadecene and the like. These α
-Olefins may be used alone or in combination of two or more.

In the copolymer of ethylene and other α-olefins, based on the total number of moles of ethylene and the α-olefin, the α-olefin is preferably 5
It accounts for ~55 mol%, more preferably 10-55 mol%.

[0026] The ethylene resin (D) is preferably 0.1
~50g/10min, more preferably 0.3~30g/1
The MFR value at 0 minutes (190°C - 2160g) is shown. Further, the preferable density of the ethylene resin is 0.850 to 0.850.
900g/cm3, and the more preferable density is 0.85
It is 0 to 0.890 g/cm3. Furthermore, the X-ray crystallinity is preferably less than 30%, more preferably less than 25%.

[0027] Since the ethylene resin (D) has the above-mentioned preferable properties, the composition of the present invention exhibits even more excellent adhesive strength.

[0028] The composition of the present invention may also include, if necessary,
Various additives, such as antioxidants, ultraviolet absorbers, pigments,
Dyes, fillers, nucleating agents, antiblocking agents, slip agents, hydrochloric acid absorbers, antistatic agents, flame retardants, etc. can be blended.

The present invention will be explained in more detail with reference to Examples below. The present invention is not limited in any way by these examples.

[0030] The MFR was measured according to ASTM D1238.

[0031]

[Example] Example 1 5 parts by weight of ethylene/propylene random copolymer graft-modified with 2% by weight of maleic anhydride (4 mol% ethylene, 96 mol% propylene; hereinafter referred to as modified random PP-1), polypropylene alone Polymer (MFR 25
A molten mixture (composition) consisting of 80 parts by weight of ethylene/butene copolymer (butene 11 mol%, ethylene 89 mol%) was prepared, and a cast film forming machine was prepared. A film with a thickness of 50 μm was formed using the following.

[0032] This film was stacked on aluminum foil with a thickness of 15 μm, and the heat seal tester was used to test the film under the following conditions:
Thermal bonding was performed at a temperature of 140°C, a pressure of 1 kg/cm2, and a time of 1 second. The results are shown in Table 1.

Example 2 In Example 1, the modified random PP-1 was changed to 20 parts by weight, and the polypropylene monomer polymer was changed to 65 parts by weight, but the rest was exactly the same. Table 1 shows the results of thermal bonding.
It was shown to.

Example 3 In Example 1, the modified random PP-1 was changed to 20 parts by weight, and the ethylene/butene copolymer was not used, but the other conditions were the same. The results of thermal bonding are shown in Table 1.

Example 4 In Example 1, instead of 5 parts by weight of modified random PP-1, ethylene/propylene random copolymer (4 mol% ethylene, 96 mol% propylene) was graft-modified with 3% by weight maleic anhydride. %: Modified random PP-
2) was used, and the other conditions were exactly the same. The results of thermal bonding are shown in Table 1.

Comparative Example 1 In Example 1, instead of 5 parts by weight of modified random PP-1, a propylene homopolymer (hereinafter referred to as modified homo-PP-1) was graft-modified with 2% by weight of maleic anhydride.
5 parts by weight was used, and the rest were kept the same. The results of thermal bonding are shown in Table 1.

Comparative Example 2 In Example 2, 20 parts by weight of modified random PP-1 was replaced with 20 parts by weight of modified homo PP-1, and the other conditions were the same. The results of thermal bonding are shown in Table 1.

Comparative Example 3 In Example 3, 20 parts by weight of modified homo PP-1 was used in place of 20 parts by weight of modified random PP-1, and the other conditions were the same. The results of thermal bonding are shown in Table 1.

Example 5 In Example 4, 15 parts by weight of an ethylene/propylene copolymer (20 mol% propylene, 80 mol% ethylene) was used in place of 15 parts by weight of the ethylene/butene copolymer, and no other components were used. Made it the same. The results of thermal bonding are shown in Table 1.

Comparative Example 4 In Example 5, 5 parts by weight of modified homo PP-1 was used in place of 5 parts by weight of modified random PP-2, and the other conditions were exactly the same. The results of thermal bonding are shown in Table 1.

[0041]

[Table 1]

[0042]

According to the present invention, a polymer composition can be obtained which exhibits excellent adhesion to metals, polyamide resins, saponified ethylene/vinyl acetate copolymers, and the like.

Claims (2)

[Claims] Claim 1: (A) an α-olefin random copolymer modified with an unsaturated carboxylic acid or a derivative thereof;
Here, the α-olefin random copolymer consists of propylene and other α-olefins in which the α-olefin other than propylene accounts for 1 to 5 mol% based on the total number of moles of propylene and other α-olefins. (B) a propylene homopolymer and/or a copolymer of propylene and other α-olefins, and (C) the above (
Based on the total weight of components A) and (B), component (A) is 0.05-30% by weight and component (B) is 70-9% by weight.
A polymer composition comprising 9.95% by weight. 2. In addition to the above components (A) and (B), it further contains (D) an ethylene resin, and (A)
Based on the total weight of component and (B) component, component (A) is 0.05-30% by weight and component (B) is 70-99% by weight.
95% by weight, and contains component (D) in an amount of 100 parts by weight or less per 100 parts by weight of the total weight of components (A) and (B).