Montedison S.p.a.

University of Brighton

Luigi Nicolais

Gaetano Guerra

Matteo Santin

Paolo Corradini

Claudio De Rosa

Vittorio Petraccone

Giancarlo Attalla

Guy Standen

Jonathan Peter Salvage

This invention relates to composite manufactured articles formed by a set of uniaxially oriented isotatic polypropylene films, having a resistance to delamination of at least 0.4 kg/cm are prepared by heating under pressure a plurality of isotatic polypropylene films superimposed to each other and separated from each other by a non oriented polypropylene films. The oriented films show an orientation of the crystalline phase such as to produce X-ray scattering angles .DELTA..times. equal to or lower than 10.degree.. The non oriented film show an orientation of the crystalline phase such as to produce X-ray scattering angles higher than 20.degree., at a temperature between a temperature equal to or higher than the melting temperature, measured in non restrain conditions, of the non oriented film and a temperature lower than the melting temperature, measured in restrained conditions, of the oriented films.

Manufactured articles based on isotactic polypropylene having a highly

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Naples, Italy

Luigi Nicolais