Acid-modified polypropylene resin, method for producing same, and resin composition using same
View Patent ↗To provide an acid-modified polypropylene resin which can be used for an adhesive capable of bonding a polyolefin type resin and a polar resin with sufficient force, its production process and a resin composition using it. An acid-modified polypropylene resin, which is obtained by grafting an organic acid component to a polypropylene resin, wherein the polypropylene resin is an isotactic polypropylene resin, the grafted amount X (wt %) of the organic acid component in the acid-modified polypropylene resin is within a range of from 1.0 wt % to 20.0 wt %, and the melt flow rate Y (g/10 min) of the acid-modified polypropylene resin satisfies the expression: Y≦18.5 exp(0.82X), a process for producing such an acid-modified polypropylene resin, a resin composition using it and a laminate.
1. An acid-modified polypropylene resin, which is obtained by grafting an organic acid component to a polypropylene resin, wherein the polypropylene resin is an isotactic polypropylene resin, the grafted amount X (wt %) of the organic acid component in the acid-modified polypropylene resin is within a range of from 1.0 to 20.0 (wt %), and the melt flow rate Y (g/10 min) of the acid-modified polypropylene resin satisfies the expression:
Y< 18.5 exp (0.82 X ) (1),
wherein the acid-modified polypropylene resin is obtained by a process which comprises mixing a polypropylene resin, an organic acid component and an organic peroxide, represented by the formula (2), with heating, to obtain the acid-modified polypropylene resin:
R 1 -A-R 2 (2)
wherein A is a bivalent connecting group containing at least one structure represented by —O—CO—O—O—, and each of R 1 and R 2 which are independent of each other, is a C 1-9 saturated or unsaturated hydrocarbon group.
2. A process for producing the acid-modified polypropylene resin as defined in claim 1 , which comprises mixing a polypropylene resin, an organic acid component and an organic peroxide, represented by the formula (2), with heating, to obtain the acid-modified polypropylene resin:
R 1 -A-R 2 (2)
wherein A is a bivalent connecting group containing at least one structure represented by —O—CO—O—O—, and each of R 1 and R 2 which are independent of each other, is a C 1-9 saturated or unsaturated hydrocarbon group.
3. The process for producing the acid-modified polypropylene resin according to claim 2 , wherein the mixing with heating is carried out in an organic solvent.
4. A resin composition, comprising 100 parts by weight of a resin comprising units derived from propylene, and from 0.1 to 30 parts by weight of the acid-modified polypropylene resin as defined in claim 1 .
5. An adhesive resin composition comprising the resin composition as defined in claim 4 .
6. A laminate comprising a substrate, and at least an adhesive layer comprising the resin composition as defined in claim 4 and a layer made of an ethylene/vinyl alcohol copolymer or a polyamide formed on the substrate.
7. The laminate according to claim 6 , wherein the substrate is made of a resin comprising units derived from an olefin.
8. A resin composition, comprising 100 parts by weight of a resin, and from 0.1 to 30 parts by weight of an acid-modified polypropylene resin as obtained by the production process as defined in claim 2 .
9. A resin composition, comprising 100 parts by weight of a resin, and from 0.1 to 30 parts by weight of an acid-modified polypropylene resin as obtained by the production process as defined in claim 3 .
10. An adhesive resin composition comprising the resin composition as defined in claim 8 .
11. An adhesive resin composition comprising the resin composition as defined in claim 9 .
12. A laminate comprising a substrate, and at least an adhesive layer comprising the resin composition as defined in claim 8 and a layer made of an ethylene/vinyl alcohol copolymer or a polyamide formed on the substrate.
13. A laminate comprising a substrate, and at least an adhesive layer comprising the resin composition as defined in claim 9 and a layer made of an ethylene/vinyl alcohol copolymer or a polyamide formed on the substrate.
14. The laminate according to claim 12 , wherein the substrate is made of a resin comprising units derived from an olefin.
15. The laminate according to claim 13 , wherein the substrate is made of a resin comprising units derived from an olefin.
16. The acid-modified polypropylene resin according claim 1 , wherein Y<18.5 exp(0.78×).
17. The acid-modified polypropylene resin according claim 1 , wherein Y is at most 100,000 g/10 min and at least 1 g/10 min.
18. The process for producing the acid-modified polypropylene resin according to claim 2 , wherein the organic peroxide is t-butyl peroxy isopropyl monocarbonate.
19. The process for producing the acid-modified polypropylene resin according to claim 2 , wherein the organic peroxide is t-hexyl peroxy isopropyl monocarbonate.
20. The acid-modified polypropylene resin according to claim 1 , wherein the polypropylene resin is a propylene homopolymer.