Abstract: A thermoplastic multi-layer foil structure comprises a styrenic polymer layer and an olefinic polymer layer bonded by an intermediary polymer layer comprising at least one layer constituted by a bonding agent. In this multi-layer structure, at least one layer containing scrap produced from said multi-layer foil structure is included in the latter, said scrap-containing layer including a mixture of said scrap with a convenient proportion of a graft copolymer of a styrenic monomer on a polyolefinic substrate.

Abstract: The invention concerns a low-density polyethylene-based polymer composition for producing films or sheaths. The present invention provides a low-density polyethylene-based polymer composition for manufacturing films or sheaths, particularly thin films or sheaths having a thickness of less than twenty microns, said polymer composition being constituted by a graft copolymer comprising at least one styrene monomer, possibly mixed with at least one acrylic monomer, said monomer or monomers being grafted onto a trunk constituted by a pre-formed combination or alloy containing by weight, 50 to 95% low-density polyethylene and 50 to 5% high density polyethylene and/or polypropylene, the proportion of the grafted styrene monomer or mixture of monomers being comprised between 5 and 50% by weight of said graft copolymer.

Abstract: A process for chemical modification of polyolefins, particularly fibrillar, powder, granular or film polyolefins, in which one or more polar monomers are grafted to the polyolefins in an aqueous dispersion, by means of a free-radical generator.Grafting is done in the presence of a wetting agent and a particular additive derived from alkanes and possessing at least 1 thiol function; the dispersion contains 0.1 to 50 parts weight of monomer, 0.1 to 3 parts weight of wetting agent, and 0.1 to 3 parts weight of additive, for 100 parts weight of polyolefin.Polyolefins that have undergone this process have an improved wettability and, in applications requiring treatment in an aqueous suspension, such as the production of partly synthetic paper, this facilitates their dispersion in water.

Abstract: A process for the preparation of polymers containing peroxide end-groups, in which one or more monomers, particularly alpha-olefins, are polymerized by means of a co-ordination catalyst in the presence of an adjuvant with the formula M(X)p, where M is boron or a metal in column IIb of the Periodic Table of Elements, p is the valency of M, and X is at least one monovalent organic radical, a hydrogen atom or a halogen, the polymer obtained is treated with a peroxidizing agent, without being de-activated, and the resulting polymer containing peroxide groups is collected.Polymers with peroxide end-groups obtained by this process, particularly olefins with peroxide end-groups, can be used to initiate polymerization of vinylic monomers, and are accordingly useful in the synthesis of block copolymers, in which one part is formed from the polymeric part of the macromolecular peroxide and the other part is derived from the vinylic monomer or monomers polymerized by means of this peroxide.