| 摘要 |
<p>Co-extrusion binder includes mixture of polyethylene with elastomer, low density polyethylene or ethylene copolymer, co-graf with unsaturated carboxylic acid. Co-extrusion binder comprises: (a) 5-30 wt. parts of polymer A comprising mixture of polyethylene A1 of density 0.935-0.980 and polymer A2 selected from elastomers, polyethylenes of very low density and ethylene copolymers; where the A1 + A2 mixture is co-grafted with unsaturated carboxylic acid; and (b) 70-95 wt. parts of polyethylene B of density 0.930-0.950. Mixture of A and B has density 0.930-0.950, contains 30-10000 of unsaturated grafted carboxylic acid, and has MFI (melt flow index) measured according to ASTM D 1238, at 190 degrees C - 21.6 equal 5-100. Independent claims are also included for: (1) multilayer structure comprising: (a) binder as claimed with, directly attached to it, a layer E of N or O - containing polar resin or metallic layer; or preferably either a layer F of polyolefin, or layer of resin E, or metallic layer; or (b) consecutive layers of: (i) PEHD (high density polyethylene); (ii) binder as claimed; (iii) either EVOH (ethylene/vinyl alcohol copolymer) (or its alloy) or polyamide (or polyamide base); (iv) binder as claimed; and (v) PEHD; (2) rigid hollow articles of structure as claimed; and (3) petrol tanks having structure as claimed.</p> |
