| abstract |
(57) [Summary] [PROBLEMS] A novel binder for coextrusion. Used in gasoline tanks with HDPE / binder / EVOH or PA / binder / HDPE structure. (1) A mixture of polyethylene (A1) having a relative density of 0.910 to 0.940 and a polymer (A2) selected from an elastomer, an ultra-low density polyethylene and a metallocene polyethylene, wherein (A1) + (A2 ) Polymers in which the mixture is co-grafted with unsaturated carboxylic acids (A), 5 to 30 parts, and (2) polyethylene (B) having a relative density of 0.910 to 0.930 (B), 95 to 70 parts, and a mixture of (A) + (B) has the following characteristics i) to iii) Coextrusion binder having: i) relative density = 0.910-0.930, ii) content of grafted unsaturated carboxylic acid = 30-1. 0,000 ppm, iii) MFI (Melt Flow Index) (ASTM D 123 8, 190 ° C / 2.16 kg) = 0.1-3 g / 10 min. |