BINDER FOR CO-EXTRUSION OF CO-GRAFTED POLYETHYLENE AND POLYPROPYLENE, DILUTED IN UNGRAFTED POLYETHYLENE

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to binder for co-extrusion based on a mixture of co-grafted polyolefins, as well as a multilayer structure containing the binder. The binder contains a mixture of at least homo- or copolymer of ethylene (A1), having density 0.940-0.980 g/cm³, and at least one copolymer of propylene (B) containing at least 51 wt % propylene. (Co)polymers of the said mixture are co-grafted with a functional monomer selected from carboxylic acids and their derivatives. The degree of graft polymerisation of the extrusion binder is more than 0.05 wt % and less than 0.5 wt % of the total weight of the said binder. The mixture is possibly diluted in at least a homo- or copolymer of ungrafted ethylene (A2). Said binder has density of 0.940-0.980 g/cm³.;EFFECT: disclosed binder has sufficient fluidity, high resistance to peeling of layers at temperature higher than 80°C, and is meant for use in a multilayer structure for protecting metal surfaces and for making packaging, rigid hollow housings, particularly bubbles or bottles, or flexible reservoirs, as well as multilayer films.;13 cl, 2 tbl, 4 ex