EVOH resin composition, and molded article and multilayer structure both comprising same
AssigneeThe Nippon Synthetic Chemical Industry Co., Ltd.
InventorsShouichi Kani, Noriaki Kurokawa
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Abstract
Provided is an EVOH resin composition suitable for use as a multilayer structure serving as a material for molded articles, in particular, liquid container such as bags for bag-in-boxes. The EVOH resin composition has such flexibility that even when used in applications where the resin composition is repeatedly folded or deformed over a long period, the resin composition does not develop pinholes or the like, and further has excellent gas barrier properties and melt molding stability.
Claims27
An EVOH resin composition comprising
- (A) a saponified ethylene-vinyl ester copolymer having ethylene content of 20 to 60 mol %;
- (B) a polymer containing aliphatic hydrocarbon monomer unit having carbon-carbon double bond, the polymer having a melt flow rate of 0.01 to 200 g/10 min under the condition of 230° C. with a load of 2160 g, but excluding polymers as component (A);
- (C) a polymer modified with a polar group-containing compound, the polymer containing aliphatic hydrocarbon monomer unit having carbon-carbon double bond, and the polymer having a melt flow rate of 0.01 to 200 g/10 min under the condition of 230° C. with a load of 2160 g;
- and
- (D) a hydrocarbon-based resin having a number average molecular weight of 100 to 3000, and having a softening point of not less than 60° C. but less than 170° C.
A molded article comprising an EVOH resin composition which comprises
- (A) a saponified ethylene-vinyl ester copolymer having ethylene content of 20 to 60 mol %;
- (B) a polymer containing aliphatic hydrocarbon monomer unit having carbon-carbon double bond, the polymer having a melt flow rate of 0.01 to 200 g/10 min under the condition of 230° C. with a load of 2160 g, but excluding polymers as component (A);
- (C) a polymer modified with a polar group-containing compound, the polymer containing aliphatic hydrocarbon monomer unit having carbon-carbon double bond, and the polymer having a melt flow rate of 0.01 to 200 g/10 min under the condition of 230° C. with a load of 2160 g;
- and
- (D) a hydrocarbon-based resin having a number average molecular weight of 100 to 3000, and having a softening point of not less than 60° C. but less than 170° C.
A multilayer structure comprising at least one layer of an EVOH resin composition which comprises
- (A) a saponified ethylene-vinyl ester copolymer having ethylene content of 20 to 60 mol %;
- (B) a polymer containing aliphatic hydrocarbon monomer unit having carbon-carbon double bond, the polymer having a melt flow rate of 0.01 to 200 g/10 min under the condition of 230° C. with a load of 2160 g, but excluding polymers as component (A);
- (C) a polymer modified with a polar group-containing compound, the polymer containing aliphatic hydrocarbon monomer unit having carbon-carbon double bond, and the polymer having a melt flow rate of 0.01 to 200 g/10 min under the condition of 230° C. with a load of 2160 g;
- and
- (D) a hydrocarbon-based resin having a number average molecular weight of 100 to 3000, and having a softening point of not less than 60° C. but less than 170° C.
Dependencies are inferred from the claim text.