Resin composition and molded product thereof

1. A resin composition, which comprises a polyvinyl alcohol-based resin (i) comprising a 1,2-diol structural unit represented by the following formula (1) in an amount of 1 to 15% by mol and an aliphatic-aromatic polyester (ii):

wherein each of R 1 , R 2 and R 3 independently represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, X represents a single bond or an alkylene group having 6 or less carbon atoms, and each of R 4 , R 5 and R 6 independently represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms;

wherein the aliphatic-aromatic polyester (ii) includes a polyester comprising, as essential components:

A) an acid component composed of

a1) 40 to 75 mol % of at least one aliphatic dicarboxylic acid or its/their ester-forming derivatives or mixtures thereof,

a2) 25 to 60 mol % of at least one aromatic dicarboxylic acid or its/their ester-forming derivative or mixtures thereof, and

a3) 0 to 5 mol % of a sulfonated compound;

B) a diol component composed of at least one C 2 - to C 12 -alkanediol or mixtures thereof;

and, optionally, one or more components selected from

C) a component selected from

c1) at least one dihydroxy compound comprising ether functions and having the formula I

HO—[(CH 2 ) n —O] m —H  (I)

where n represents 2, 3 or 4 and m represents an integer from 2 to 250,

c2) at least one hydroxy-carboxylic acid of the formula II

HO—[C(O)-G-O] p —H  (II)

where p represents an integer from 1 to 1500 and G represents a radical selected from the group consisting of phenylene, o-hydroxyphenylene, —(CH 2 ) q —, where q is an integer from 1 to 5, —C(R)H— and —C(R)HCH 2 , where R represents methyl or ethyl,

c3) at least one amino-C 2 - to C 12 -alkanol or at least one amino-C 5 - to C 10 -cycloalkanol or mixtures thereof,

c4) at least one diamino-C 1 - to C 8 -alkane,

c5) at least one 2,2′-bisoxazoline of the formula III

where R1 represents a single bond, a (CH 2 ) z alkylene group, where z=2, 3 or 4, or a phenylene group,

c6) at least one amino carboxylic acid selected from the group consisting of natural amino acids, polyamides obtainable by polycondensation of a dicarboxylic acid having 4 to 6 carbon atoms and a diamine having 4 to 10 carbon atoms, compounds of the formula IV

HO—[C(O)-T-O] s —H  (IV)

where s represents an integer from 1 to 1500 and T represents a radical selected from the group consisting of phenylene, —(CH 2 ) u —, where u represents an integer from 1 to 12, —C(R 2 )H— and —C(R 2 )HCH 2 , where R 2 represents methyl or ethyl,

or mixtures of c1) to c6);

and

D) a component selected from:

d1) a compound having at least three groups capable of ester formation,

d2) a di- or polyisocyanate,

d3) a di- or polyepoxide

or mixtures of d1) to d3),

wherein a content ratio (i)/(ii) of the polyvinyl alcohol-based resin (i) to the aliphatic-aromatic polyester (ii) is from 95/5 to 60/40 in terms of weight ratio.

2. The resin composition according to claim 1 , wherein all of R 1 to R 6 in the formula (1) represent a hydrogen atom, and X in the formula (1) represents a single bond.

3. The resin composition according to claim 1 , wherein a content of the structural unit represented by the formula (1) contained in the polyvinyl alcohol-based resin (i) is 1 to 15% by mol.

4. The resin composition according to claim 2 , wherein a content of the structural unit represented by the formula (1) contained in the polyvinyl alcohol-based resin (i) is 1 to 15% by mol.

5. A molded product, which comprises a melt molded product of the resin composition according to claim 1 .

6. A laminated film comprising a layer formed from the resin composition according to claim 1 , and a layer formed from another biodegradable polymer.

7. A coextruded film comprising a layer formed from the resin composition according to claim 1 , and a layer formed from another biodegradable polymer.

8. A molded product, which comprises a melt molded product of the resin composition according claim 2 .

9. A laminated film comprising a layer formed from the resin composition according to claim 2 , and a layer formed from another biodegradable polymer.

10. A coextruded film comprising a layer formed from the resin composition according to claim 2 , and a layer formed from another biodegradable polymer.

11. A molded product, which comprises a melt molded product of the resin composition according claim 3 .

12. A laminated film comprising a layer formed from the resin composition according to claim 3 , and a layer formed from another biodegradable polymer.

13. A coextruded film comprising a layer formed from the resin composition according to claim 3 , and a layer formed from another biodegradable polymer.

14. A molded product, which comprises a melt molded product of the resin composition according claim 4 .

15. A laminated film comprising a layer formed from the resin composition according to claim 4 , and a layer formed from another biodegradable polymer.

16. A coextruded film comprising a layer formed from the resin composition according to claim 4 , and a layer formed from another biodegradable polymer.

17. A resin composition according to claim 1 , wherein a content ratio (i)/(ii) of the polyvinyl alcohol-based resin (i) to the aliphatic-aromatic polyester (ii) is from 80/20 to 60/40 in terms of weight ratio.