Resin composition, forming resin composition prepared by using the same, laminate, and laminate producing method
View Patent ↗A resin composition is provided, which comprises: an ethylene-vinyl acetate copolymer (A); and a saponified ethylene-vinyl acetate copolymer (B) having an ethylene content of not less than 70 mol %, wherein the component (B) is present in a proportion of 1 to 30 parts by weight based on 100 parts by weight of the component (A). Where the resin composition is used in combination with a scrap laminate including a polyolefin resin layer and an EVOH layer for recycling the scrap laminate, die build-up is suppressed, and a product formed from the resulting recycled material is excellent in appearance and substantially free from coloration.
1. A method of producing a resin composition (II) comprising:
blending a resin composition (I) with a scrap laminate including a layer of a polyolefin resin (D) of polyethylene or polypropylene, having a melt flow rate (MFR) of 0.5 to 30 g/10 minutes (at 230° C. with a load of 2160 g) and a layer of a saponified ethylene-vinyl acetate copolymer (E) having an ethylene content of 20 to 50 mol %, having a saponification degree of not less than 90 mol % and having a melt flow rate (MFR) of 1 to 35 g/10 minutes (at 210° C. with a load of 2160 g);
wherein the resin composition (I) comprises an unsaponified ethylene-vinyl acetate copolymer (A) having a vinyl acetate content of 3 to 30 mol % and having a melt flow rate (MFR) of 1 to 30 g/10 minutes (at 190° C. with a load of 2160 g); and
a saponified ethylene-vinyl acetate copolymer (B) having an ethylene content of 80 to 95 mol %, having a saponification degree of not less than 20 mol % and having a melt flow rate (MFR) of 2 to 30 g/10 minutes (at 190° C. with a load of 2160 g);
wherein a ratio (x)/(y) of weight (x) of the scrap laminate to weight (y) of the resin composition (I) is (x)/(y)=99.5/0.5 to 90/10;
wherein the saponified ethylene-vinyl acetate copolymer (E) has a proportion of 0.1 to 20 wt % based on the overall weight of the scrap;
wherein the saponified ethylene-vinyl acetate copolymer (B) in the resin composition (I) is present in a proportion of from 0.05 to a proportion of 0.25 parts by weight based on a total of 100 parts by weight of the polyolefin resin (D) and the saponified ethylene-vinyl acetate copolymer (E) in the scrap;
wherein the component (B) is present in a proportion of 1 to 30 parts by weight based on 100 parts by weight of the component (A) in the resin composition (I).
2. The method as set forth in claim 1 , further comprising blending at least one selected from a hydrotalcite (C1) and a higher fatty acid metal salt (C2) in a proportion of 1 to 30 parts by weight based on 100 parts by weight of the unsaponified ethylene-vinyl acetate copolymer (A).