The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 05, 1990
Filed:
Dec. 21, 1987
Paolo Corradini, Naples, IT;
Claudio De Rosa, Naples, IT;
Gaetano Guerra, Naples, IT;
Luigi Nicolais, Naples, IT;
Vittorio Petraccone, Naples, IT;
Giancarlo Attalla, Rijswijk, NL;
Montedison S.p.A., Milan, IT;
Abstract
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.