WO2000026317A1

WO2000026317A1 - Adhesive composition and multilayer structure

Info

Publication number: WO2000026317A1
Application number: PCT/JP1999/006110
Authority: WO
Inventors: Yuji Sawada; Hiromi Shigemoto
Original assignee: Mitsui Chemicals, Inc.
Priority date: 1998-11-02
Filing date: 1999-11-02
Publication date: 2000-05-11
Also published as: JP4169310B2

Abstract

An adhesive composition having excellent adhesion to polyolefins and polyketones and satisfactory moldability. The composition comprises a product of the reaction of (A1) a first graft copolymer obtained by grafting at least one polymerizable ethylenic carboxylic acid or a derivative thereof onto the backbone of an ethylene/α-olefin copolymer having a density of 0.85 to 0.89 g/cm3 and (A2) a second graft copolymer obtained by grafting at least one polymerizable ethylenic carboxylic acid or a derivative thereof onto the backbone of an ethylene/α-olefin copolymer having a density of 0.90 to 0.94 g/cm3 with (C) an amino compound having at least two primary or secondary amino groups at least one of which is primary, the amount of the amino compound being 0.01 to 1.0 part by weight per 100 parts by weight of the sum of the first and second graft copolymers.

Description

Description Adhesive composition and multilayer structure

The present invention relates to an adhesive composition and a multilayer structure. More specifically, the present invention relates to an adhesive composition having excellent moldability and good adhesiveness, and a multilayer structure using the same.

Conventional technology

Polyolefin-containing mixtures suitable for use as adhesive layers in multilayer structures are known. These adhesive mixtures are commonly referred to as tie layers. For example, U.S. Pat. No. 2,081,723 discloses that (A) a graft copolymer in which the polyethylene backbone is darafted with at least one polymerizable ethylenically unsaturated carboxylic acid or anhydrous ruponic acid; and (B) A modified polyolefin adhesive mixture comprising a mixed resin mixture containing linear low-density polyethylene and polypropylene is disclosed.

For the purposes of the present invention, polyketone is defined as a linear polymer having an alternating structure of (a) units derived from carbon oxide, and (b) units derived from one or more olefinically unsaturated compounds. Is done. Also, mixtures in which the linear polymer contains a small percentage (eg, up to 10% by weight) of the corresponding homopolymer or copolymer derived from the unsaturated unsaturated compound are understood to be within the definition. It should be.

Such a polyketone has the following formula (I):

Where R is independently hydrogen or a hydrocarbyl group, and m is a large integer. These are disclosed in U.S. Patent No. 3,694,412. Have been. Further, a method for producing a polyketone is disclosed in U.S. Pat. No. 3,694,412, and in European Patent Nos. 1,810,014 and 1,219,655. ing. Adhesive resins for polyketones are introduced in WO95Z092122.

Disclosure of the invention

An object of the present invention is to provide a polyolefin-containing adhesive composition having a novel composition.

Another object of the present invention is to provide an adhesive resin which can improve the adhesive force with polyketone and can be molded.

Still another object of the present invention is to provide an adhesive resin having an excellent balance between good adhesive strength and moldability.

Still another object of the present invention is to provide a multilayer structure using the adhesive composition of the present invention as an adhesive layer.

Still other objects and advantages of the present invention will become apparent from the following description.

According to the present invention, the above objects and advantages of the present invention are:

(A1) At least one polymerizable ethylenically unsaturated carboxylic acid or a derivative thereof is grafted onto the trunk of an ethylene / α-olefin copolymer having a density of 0.85 to 0.89 gZ cm ³ . A first graft copolymer,

(Α2) At least one polymerizable ethylenically unsaturated carboxylic acid or a derivative thereof is grafted on the trunk of an ethylene / α-olefin copolymer having a density of 0.9 to 0.94 gZ cm ³ . A second graft copolymer and

(C) an amino compound having at least two primary or secondary amino groups, at least one of which is a primary amino group, based on a total of 100 parts by weight of the first and second graft copolymers. .01 to 1.0 parts by weight

This is achieved by an adhesive composition characterized by containing the reaction product of (1). According to the present invention, further, the above objects and advantages of the present invention are:

A first layer composed of a polyolefin composition and a second layer composed of a polyketone composition are achieved by a multilayer structure joined by the adhesive composition of the present invention. You.

Preferred embodiments of the invention

The backbone polymer of the first graft copolymer (A 1) used in the present invention is an ethylene / one-year-old olefin copolymer having a density of 0.85 to 0.89 gZcm ³ (hereinafter referred to as a first ethylene / α-year-old olefin copolymer). Sometimes referred to as a polymer). As α-olefin, α-olefin having 3 to 20 carbon atoms is preferably used. Preferred examples of such α-olefin include propylene, 1-butene, 11-hexene, 4-methyl-1-pentene, 1-octene, 1-decene and the like.

The first ethylene / α-olefin copolymer preferably contains 50 to 97 mol% of polymer units derived from ethylene, more preferably 70 to 95 mol%, and therefore preferably contains polymer units derived from one-year-old olefin. The content is 50 to 3 mol%, more preferably 30 to 5 mol%.

The first ethylene / α-olefin copolymer preferably has a melt edge rate of 3 to 100 gZl 0 min (measured according to ASTM D 1238 at 190 at a load of 2.16 kg). The first ethylene-a-olefin copolymer is usually amorphous or low-crystalline having a crystallinity of less than 40% by an X-ray method.

Examples of the polymerizable ethylenically unsaturated sulfonic acid and its derivatives grafted to the trunk polymer as described above include, for example, acrylic acid, methacrylic acid, maleic acid, itaconic acid, citraconic acid, mesaconic acid, and anhydride. Maleic acid, 4-methylcyclohexan-hexan-1,4-dicarboxylic anhydride, bicyclo (2.2.2) oct-5-ene-2,3-dicarboxylic anhydride, 1,2,2 3,4,5,8,9,10-Hydrohydronaphthylene 1,2,3-dicarboxylic anhydride, 2-oxa 1,3-diketospiro (4.4) Non-1 7-ene, bicyclo ( 2.2.1) Hept-5-ene-1,2,3-dicarboxylic anhydride, maleovimaric acid, tetrahydrofluoric anhydride, X-methyl-piciclo (2.2.1) Hept-5-ene-2,3-dicarboxylic acid Water-free, X-methyl-norporone 5-ene-2,3-dicarbo Acid anhydride, nor Born-5-ene-2,3-dicarboxylic anhydride can be mentioned. Preferably, maleic anhydride is used.

In the graft copolymer of the component (A1), the graft ratio of at least one polymerizable ethylenically unsaturated carboxylic acid or a derivative thereof to the first ethylene / α-olefin copolymer is preferably 0.001 to 0.6. % By weight.

The trunk polymer of the second graft copolymer (Α2) is an ethylene α-olefin copolymer having a density of 0.90 to 0.94 g cm ³ (hereinafter referred to as a second ethylene α-olefin copolymer). There is).

Examples of the α-olefin include the same as those described for the first ethylene′-olefin copolymer.

The second ethylene / α-olefin copolymer preferably has polymerized units derived from ethylene in an amount of preferably 92 to 99.8 mol%, more preferably 95 to 99.5 mol%. Is contained at 8 to 0.2 mol%, more preferably 5 to 0.5 mol%.

The second ethylene-a-olefin copolymer preferably has a melt edge rate of 3 to 100 gZl 0 min (measured according to ASTM D 1238, 190, measured under a load of 2.16 kg).

Examples of the polymerizable ethylenically unsaturated sulfonic acid or a derivative thereof grafted to the trunk polymer as described above include the same as those described for the first graft copolymer (A1). Here, too, maleic anhydride is preferably used.

In the second graft copolymer of the component (A2), the graft ratio of at least one polymerizable ethylenically unsaturated carboxylic acid or a derivative thereof to the second ethylene-a-olefin copolymer is preferably 0.001 to 0.6% by weight. In order to graft a graft monomer selected from the unsaturated carboxylic acid or a derivative thereof to the trunk polymer, various conventionally known methods can be employed. For example, a method in which a trunk polymer is melted and a graft monomer is added thereto to cause a graft reaction, or a solution in which a trunk polymer is dissolved in a solvent to form a solution. For example, a method in which a graft reaction is performed by adding a monomer. In either case, it is preferable to carry out the graft reaction in the presence of a radical initiator in order to efficiently graft-copolymerize the graft monomer. The grafting reaction is usually performed at a temperature of 60 to 350 ° C. The usage ratio of the radical initiator is usually in the range of 0.001 to 1 part by weight based on 100 parts by weight of the polyolefin.

Examples of the radical initiator include organic peroxides and organic polyesters, such as benzoyl peroxide, dicopenyl benzoyl peroxide, dicumyl peroxide, di-tert-butyl peroxide, 2,5- Dimethyl-2,5-di (peroxydobenzoate) hexine-3,1,4-bis (tert-butylperoxysopropyl) benzene, lauroylbeloxide, tert-butylperacetate, 2,5-dimethyl- 2,5-di (tert-butylperoxy) hexine-1,2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, tert-butylperbenzoate, tert-butylperphenylacetate, tert-butyl perisobutylate, tert-butyl per-sec-octate, tert-butyl pervivarate, Ruberupibare one preparative and t e r t one-heptyl Bae Rougier chill acetate, other § zo compounds such Azobisuisobu Chironitoriru, dimethyl § zone isobutyl butyrate is used.

Of these, dicumylperoxide, di-tert-butylperoxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexine-3,2,5-dimethyl-2,5-di (tert) Dibutyl peroxide such as —butylperoxy) hexane and 1,4-bis (tert-butylperoxyisopropyl) benzene are preferred.

Here, the graft ratio is defined as the weight ratio of the grafted unsaturated carboxylic acid or its derivative based on the total weight of the backbone polymer before the grafting.

The first graft copolymer (A 1) and the second graft copolymer (A 2) can be separately prepared by the graft reaction as described above, and the first ethylene copolymer and the first ethylene copolymer can be prepared separately. Mixture of 2 ethylene-α-olefin copolymers The mixture may be prepared in advance, and the mixture may be subjected to the graft reaction as described above to prepare a mixture.

Methods for preparing graft copolymers are well known, and may be any suitable method, for example, ethylene-α-olefin copolymers such as ethylene-propylene copolymers and polymerizable ethylenically unsaturated carboxylic acids or derivatives thereof. And can be used to prepare from

One such suitable method is that the temperature at which the melting point of the backbone polymer is exceeded and the preferred half-life of the free radical initiator is exceeded in the presence of a radical initiator such as an organic peroxide or hydrogen peroxide. It consists of mixing the polymer with a polymerizable ethylenically unsaturated carboxylic acid or a derivative thereof. Suitable radical initiators are well known. This grafting method can be performed using a known mixing device such as a Brabender mixer, a Banbury mixer or a roll mill. Preferably, the grafting process is performed in a closed container.

Convenient methods for preparing graft copolymers include ethylene / α-olefin copolymers, polymerizable ethylenically unsaturated carboxylic acids or derivatives thereof, which form the backbone polymer, using one or more screw extruders. And co-extrusion with a radical initiator such as organic peroxide or hydrogen peroxide. In this case, they may be mixed in advance and supplied to the extruder, or after feeding the trunk polymer to the extruder, a polymerizable ethylenically unsaturated carboxylic acid or peroxide is fed in the middle of the extruder to perform a graft reaction. May be.

The melt flow rate (load: 2.16 kg, 190) of the first graft copolymer (A1) is preferably 2 gZl 0 min or more, more preferably 2 to 40 gZl Omin or more, particularly preferably 2 to 20 gZl Omin or more.

The melt flow rate (load: 2.16 kg, 190) of the second graft copolymer (A2) is preferably at least 2 g / l Omin, more preferably at least 2 to 40 g / 1 Omin.

The first graft copolymer (A1) and the second graft copolymer (A2) When prepared as a mixture as described above, the melt flow rate (at a load of 2.16 kg, 190) of the obtained graft polymer mixture is preferably 2 gZl O min or more, more preferably 2 to 60 gZl 0 min. The above is particularly preferable, and it is more preferably 2 to 30 gZl 0 min or more.

In the composition of the present invention, the weight ratio of the first graft copolymer (A1) to the second graft copolymer (A2) is preferably 0.01: 1.0 to 1.0: 0.01, more preferably 0.1: 1.0 to 1.0. : 0.1.

The polyolefin of component (B) can be a homopolymer or copolymer of ethylene or an alpha-olefin having 3 to 10 carbon atoms. For example, it may be a copolymer of ethylene and at least one olefin copolymer having 3 to 10 carbon atoms such as polyethylene, polypropylene, for example butene, or a copolymer of propylene and ethylene or propylene having 4 to 10 carbon atoms. Component (Β) is preferably the same as the backbone polymer used to prepare component (A1) or component (Α2). Furthermore, if the adhesive composition according to the invention is used for joining polyolefins to polyketones, component (Β) is preferably a polyolefin which is identical or similar to the polyolefins to be joined.

Component (Β) is an optional component, but is used in an amount of 233 parts by weight or less based on a total of 100 parts by weight of component (A1) and component (成分 2). Component (Β) preferably has a melt flow rate (load 2.16 kg, 19 Or) of 5 to 60 gZl min, particularly preferably 10 to 40 gZl min.

Component (C) is an amino compound having at least two primary or secondary amino groups, at least one of which is a primary amino group. Component (C) is preferably a diamine containing two primary amino groups and up to 16 carbon atoms and having at least 2 carbon atoms between the two primary amino groups. Examples of such a diamine include an aromatic skeleton linking amino groups such as phenylenediamine, 4,4′-diaminobiphenyl and di (4-aminophenyl) ether; Aminocyclohexyl) Contains a cycloaliphatic linking skeleton such as methane or 1,4-diaminocyclooctane, or Is the following equation (Π):

H ₂ N (CH ₂ ) _n H ₂ (Π)

(Wherein, n is an integer including 2 to 16). Examples of the polymethylene diamine of the formula (Π) include trimethylene diamine, tetramethylene diamine, hexamethylene diamine, decamethylene diamine, dodecamethylene diamine, and hexamethylene diamine. be able to. Also, a diamine corresponding to a form in which an oxa group (-0-) is introduced between two adjacent methylene groups at any position of polymethylene diamine, for example, 4,9-dioxadodecane-1,12-diamine Are also preferably used.

The component (C) is used in an amount of 0.01 to 1.0 part by weight, preferably 0.01 to 0.6 part by weight, per 100 parts by weight of the total of the component (A1) and the component (A2).

Component (C) reacts with the graft copolymers (A1) and (A2). Component (C) can be reacted with the graft copolymers (A1) and (A2) in several ways. A preferred method is to melt them in a known mixing device such as a Brabender mixer, a Banbury mixer or a roll mill or a twin screw extruder so that they react in the melt. The reaction of component (C) with the graft copolymers (A1) and (A2) can be carried out before or simultaneously with mixing with component (B) (if used). However, it is preferred that the graft copolymers (A1) and (A2) first react with component (C) and then mix with (B).

The adhesive composition comprising the components (Al), (A2), (B) and (C) can be prepared using known techniques and equipment for batch or continuous mixing.

The adhesive composition of the present invention may also contain additives commonly used in such compositions, such as, for example, antioxidants.

The polyolefin-containing adhesive composition of the present invention is particularly suitable for bonding a polyolefin to a polyketone. Methods of using adhesive compositions to bind polyolefins to polar substrates are known, for example, lamination, coextrusion, extrusion. Dispensing lamination and coextrusion coating can be mentioned.

The present invention relates to a multilayer structure comprising a first layer containing polyolefin and a second layer containing polyketone, wherein the first and second layers are bonded together with an intermediate layer of the adhesive composition of the present invention. To provide. In particular, the invention provides multilayer structures, such as coextrusions, for example, multilayer films produced by coextrusion.

The polyolefin layer is any layer that contains a major portion of the homoolefin or copolymer. Preferably, the polyolefin layer comprises polyethylene or polypropylene, for example, a propylene copolymer containing at least 70% by weight of polymerized propylene units.

The second layer contains a polyketone as described above. As noted above for the purposes of the present invention, polyketones have the selective structure of (a) units derived from carbon oxide, and (b) units derived from one or more olefinically unsaturated compounds. Defined as a linear polymer. Preferred olefinic units are those derived from α-olefins having 2 to 12 carbon atoms, or substituted derivatives thereof, or styrene or alkyl-substituted derivatives of styrene. Such an olefin is preferably selected from η-α-olefins having 2 to 5 carbon atoms. The olefin units are preferably derived from a force derived from ethylene or, most preferably, η-α-amino olefins having 3 to 6 carbon atoms, for example, a mixture of ethylene and propylene. .

In these most preferred materials, the molar ratio of ethylene units to η-α-olefin units having 3 to 6 carbon atoms is more than or equal to 1, preferably between 2 and 30.

The multilayer structure according to the invention may contain further layers in addition to the three layers defined hereinbefore. For example, a five-layer structure includes a first layer of polyolefin, a second layer of the adhesive composition of the invention, a third layer of polyketone, a fourth layer of the adhesive composition of the invention, and a fifth layer of polyolefin. be able to.

The present invention provides a multilayer film or sheet wherein a first layer comprising polyolefin and a second layer comprising polyketone are bonded together with an intermediate layer of the adhesive composition of the invention. Products manufactured by thermoforming can be provided.

Example

The present invention will be described by the following examples.

Examples 1, 2 and Comparative Examples 1-4

(1) As components (A1) and (A2), a graft copolymer used in Examples shown in Table 1 and a graft copolymer used in Comparative Examples shown in Table 3 were prepared.

In Table 1, MAH-MIX-1 and MAH-MIX-2, which are a mixture of the first graft copolymer and the second graft copolymer, are the first ethylene.α-olefin copolymer LLDPE ( Random copolymerization of ethylene 96.5 mol% and butene 3.5 mol%) and EPR (a random copolymer of 81 mol% ethylene and 19 mol% propylene), which is a second ethylene-α-olefin copolymer A mixture was prepared in advance, and the mixture was prepared by grafting with maleic anhydride (無水) by a conventional method.

~~ --― _ iZh Lima-one MAH-MIX- 1 MAH-MIX- 2 items LLDPE EPR LLDPE EPR Base density kg / m ³ 0.920 0.87 0.920 0.87

MFR g / 10min @ 19 (TC 20 22 20 22 Blend ratio 70 30 30 70 Graft MAH 0.18 0.18

After grafting MFR g / 10min @ 190t: 11 12

Table 2

(2) 4,9-Dioxadodecane-1, 12-diamine (component (C)) as diamine, ΜΑΗ—MIX-1 (Example 1) or MAH—MIX-2 as components (A1) and (Α2) Example 2 was melt-mixed at a rate shown in Table 3 below at 210 in a 30ππηφ twin-screw extruder at a rotor speed of 270 rpm. Using the obtained adhesive composition, the low-density polyethylene Z adhesive composition Nopolyketone adhesive composition No. low-density polyethylene five layers (in this order, 300/100/200/100/300 m) Was produced using a multilayer extruder at a molding speed of 0.5 m / min.

The obtained laminated structure was subjected to a peeling test, and the adhesive strength (NZl 5 mm) of the adhesive composition of the present invention to polyketone was measured. Table 3 shows the adhesive strength between the adhesive composition of the present invention and polyketone. Table 3

(3) As diamine, 4,9-dioxadodecane-1, 12-diamine (component (C)), as component (A1) or (A2), MAH— EPR—1 (Comparative Example 1), MAH-EPR-2 (comparison) Example 2), MAH—LLDPE-1 (Comparative Example 3), MAH-LLDPE-2 (Comparative Example 4), and LLDPE as component (B) (density 0.920 g / cm \ melt flow rate 20 gZl 0 min, Comonomer butene 13.6 mol%), EPR (density 0.87, propylene content 19 mol%, melt mouth monolate 22 gZl Omin) were mixed in a 3 Ommc) twin-screw extruder at the ratio shown in Table 4 below. Melt mixed at 21 with a rotor speed of rpm. Using the obtained comparative adhesive composition, a low-density polyethylene adhesive composition, Adhesive composition Z Five layers of low-density polyethylene (in this order, 300Z100 / 200/100/30 Om) A laminate structure with a force of 0.5 m / min was formed using a multilayer extruder at a molding speed of 0.5 m / min. Manufactured.

The obtained laminated structure was subjected to a peeling test, and the adhesive strength (NZl 5 mm) of the comparative adhesive composition to polyketone was measured. Table 4 shows the adhesive strength between the comparative adhesive composition and the polyketone. Table 4

As is clear from the comparison between Examples 1 and 2 and Comparative Examples 1 to 4, the adhesive compositions of Examples 1 and 2 and the adhesive compositions of Comparative Examples 1 to 4 contained maleated maleic anhydride. It can be seen that the compositions of Examples 1 and 2 exhibit significantly better adhesion than the adhesive compositions of Comparative Examples 1 to 4, despite the amounts being approximately the same.

As described above, the adhesive composition of the present invention has excellent moldability and good adhesiveness, and is particularly suitably used for adhesion between polyolefin and polyketone.

Claims

The scope of the claims

1. (A1) a first ethylene-α-olefin polymer having a density of 0.85 to 0.89 gZ cm ³ , wherein at least one polymerizable ethylenically unsaturated carboxylic acid or a derivative thereof is grafted on the trunk; Graft copolymers,

([Alpha] 2) density from 0.90 to 0.948 (: 111 ³ Echiren 'alpha-old second graft at least one polymerizable ethylenically unsaturated carboxylic acid or its derivative conductor trunk of Refuin copolymer grafted Copolymer and

(C) an amino compound having at least two primary or secondary amino groups, at least one of which is a primary amino group, per 100 parts by weight of the total of the first and second graft copolymers 0.01 to: L .0 parts by weight

An adhesive composition comprising the reaction product of (1). 2. Ethylene-α-olefin polymer, which is the backbone of the first graft copolymer (A1), is composed of 50-97 mol% of polymerized units derived from ethylene and 50-3 mol% of polymerized units derived from one-year-old refin. 2. The adhesive composition according to claim 1, comprising:

3. Ethylene-one-year-old olefin copolymer, the trunk of the first graft copolymer (A1), is 3 ~: L 00 g / 1 Omin (ASTM D 1238, 190, load 2.

The adhesive composition according to claim 1, which has a melt flow rate of 16 kg).

4. In the first graft copolymer (A1), the graft ratio of at least one kind of polymerizable ethylenically unsaturated carboxylic acid or a derivative thereof to the backbone polymer is 0.001 to 0.6% by weight. 2. The adhesive composition according to 1.

5. Ethylene and α-olefin copolymer, which is the backbone of the second graft copolymer (A2), is composed of 92 to 99.8 mol% of polymerized units derived from ethylene and depends on freeolefin. The adhesive composition according to claim 1, comprising 8 to 0.2 mol% of the resulting polymerized units.

6. Ethylene-α-olefin copolymer, which is the trunk of the second graft copolymer (A2), is from 3 to: L 00 gZl 0 min (ASTM D 1238, 190 ° C, load 2.16 kg) melt flow rate 2. The adhesive composition according to claim 1, comprising:

7. The second graft copolymer (A2), wherein at least one polymerizable ethylenic unsaturated carboxylic acid or a derivative thereof has a daraft ratio of 0.001 to 0.6% by weight to the backbone polymer. 2. The adhesive composition according to 1.

8. The adhesive composition according to claim 1, wherein the first graft copolymer (A1) has a melt flow rate of 2 gZl Omin or more (190, 2.16 kg).

9. The adhesive composition according to claim 1, wherein the melt flow rate of the second graft copolymer (A2) is 2 gZl Omin or more (190, 2.16 kg).

10. The adhesive composition according to claim 1, wherein the weight ratio of the first graft copolymer (A1) to the second graft copolymer (A2) is 0.01: 1.0 to 1.0: 0.01.

11. An amino compound having at least two primary amino groups or secondary amino groups contains two primary amino groups and up to 16 carbon atoms and at least between two primary amino groups. 2. The adhesive composition according to claim 1, which is a diamine having two carbon atoms.

12. The method according to claim 1, wherein a reaction product of the first graft copolymer (A1), the second graft copolymer (A2) and the amino compound (C) is prepared by melt-mixing these components. Adhesive composition.

13. The adhesive composition according to claim 1, further comprising 23.3 parts by weight or less of polyolefin (B).

14. The adhesive composition according to claim 13, wherein the polyolefin (B) is a homopolymer or a copolymer of at least one monomer selected from the group consisting of ethylene and α-olefin having 3 to 10 carbon atoms. .

15. The adhesive composition according to claim 13, wherein the melt lipoate of the polyolefin (Β) is 5 to 60 gZ10 minutes (19O, 2.16 kg).

1 6. A multilayer structure in which a first layer made of polyolefin and a second layer made of polyketone are joined by the adhesive composition according to claim 1.

17. The multilayer structure according to claim 16, wherein the polyolefin is polyethylene, polypropylene or a propylene copolymer containing at least 70% by weight of propylene units.

18. The multilayer structure of claim 16, wherein the polyketone is a linear polymer having units derived from carbon monoxide and units derived from one or more olefinically unsaturated compounds.

1 9. Use of the adhesive composition according to claim 1 for bonding polyolefin and polyketone.