Adhesive resin composition and laminate

1. An adhesive resin composition, comprising, by weight:

10-99.5% of a resin ingredient (A), which is a product of a successive propylene polymerization in the form of a polymer comprising

10-60% by weight of (a1) a propylene homopolymer or a copolymer of propylene and at least one second α-olefin comprising 2-8 carbon atoms, and

40-90% by weight of (a2) a copolymer of propylene, ethylene, and optionally at least one third α-olefin comprising 2-8 carbon atoms,

obtained by polymerizing to obtain (a1) and then further polymerizing to obtain (a2);

0.5-30% of a resin ingredient (B), which is a propylene homopolymer or a propylene copolymer which each has been modified with at least one modifier selected from the group consisting of an unsaturated carboxylic acid and a derivative thereof, so that the content of the component derived from the unsaturated carboxylic acid and/or derivative thereof is 0.01% by weight or higher; and

0-89.5% of a resin ingredient (C), which is an olefin resin,

wherein a content by weight, based on the resin ingredient (A), of

(1) room-temperature-xylene solubles derived from component (a1)) is 1-20%,

(2) room-temperature-xylene insolubles derived from component (a2) is lower than 20%,

(3) room-temperature-xylene solubles derived from component (a2) is 10-60%, and wherein

(4) the room-temperature-xylene solubles derived from component (a2) have a content of α-olefins excluding propylene of 20% by weight or higher.

2. The composition of claim 1 , wherein the resin ingredient (B) has an MFR(180) B of 30-1,000 g/10 min at 180° C. under a 2.16-kg load, and

wherein a ratio of the MFR(180) B to an MFR(230) A of the resin ingredient (A) measured in g/10 min at 230° C. under a 2.16 kg load (MFR(180) B /MFR(230) A ) is 1-10,000.

3. The composition of claim 1 , wherein the room-temperature-xylene solubles in the component (a2) have an ethylene content of 20-40% by weight based on the resin ingredient (A).

4. The composition of claim 1 , wherein the component (a2) in the resin ingredient (A) is a copolymer of propylene and ethylene.

5. The composition of claim 1 , wherein the component (a1) in the resin ingredient (A) is a propylene homopolymer.

6. The composition of claim 1 , wherein the component (a1) and the component (a2) in the resin ingredient (A) each are a copolymer of propylene and ethylene.

7. The composition of claim 1 , wherein the resin ingredient (A) has a flexural modulus of from 50 MPa to lower than 300 MPa (lower than about 3,000 kg/cm 2 ).

8. The composition of claim 7 , wherein the resin ingredient (A) has a tensile strength at yield point of 3 MPa or higher.

9. The composition of claim 7 , wherein the resin ingredient (A), when examined for a melting point by the DSC method, has a peak top value Tm of 162° C. or lower.

10. The composition of claim 1 , wherein the resin ingredient (A) has an MFR(230) A of 0.1-50 g/10 min.

11. The composition of claim 1 , wherein the resin ingredient (C) is a propylene homopolymer or a copolymer of propylene and one or more α-olefins and has a propylene content of 5-100% by weight.

12. A laminate, comprising an adhesive resin layer comprising the composition of claim 1 .

13. The laminate of claim 12 , further comprising:

a second layer comprising at least one material selected from the group consisting of a polypropylene resin, a polyethylene resin, a ethylene/vinyl alcohol copolymer resin, a polyamide resin, a polyester resin, a metal, paper, a nonwoven fabric, and a woven fabric,

wherein the laminate has superposed layers comprising the adhesive resin layer and the second layer.

14. The laminate of claim 13 , comprising the adhesive resin layer and a polyester resin layer superposed on at least one side of the adhesive resin layer.

15. The laminate of claim 13 , comprising the adhesive resin layer and a polyethylene resin layer superposed on at least one side of the adhesive resin layer.

16. The laminate of claim 13 , comprising the adhesive resin layer, a polyester resin layer superposed on one side of the adhesive resin layer, and a polyethylene resin layer superposed on the other side of the adhesive resin layer.

17. The laminate of claim 14 , wherein a ratio of a thickness of the adhesive resin layer to a thickness of the polyester resin layer is from 1:100 to 1:1.

18. The laminate of claim 12 , wherein a polyester resin layer is superposed on the adhesive resin layer so as to be in direct contact with the adhesive resin layer, and

wherein a strength of adhesion between the adhesive resin layer and the polyester resin layer is 70 g/cm or higher at each of measuring atmosphere temperatures of 23° C. and 80° C.

19. The laminate of claim 18 , wherein the polyester resin layer is a poly(ethylene terephthalate) layer.

20. The laminate of claim 18 , wherein the strength of adhesion between the layers is 100 g/cm or higher at each of measuring atmosphere temperatures of 23° C. and 80° C.

21. The laminate of claim 20 , wherein the strength of adhesion between the layers is 200 g/cm or higher at each of measuring atmosphere temperatures of 23° C. and 80° C.