Abstract: The biaxially oriented hollow bodies are obtained by employing random propylene terpolymers which comprise ethylene (0.5 to 5% by weight) and 1-butene (2 to 12% by weight), which have a melting temperature of 120 to 150° C., which are degraded by a free radical generator and which have a degradation factor A of from 1.5 to 10, the said factor being represented by MFIg/MFIi, in which MFIg is the melt flow index of the degraded terpolymer (of between 3 and 30 g/10 min) and MFIi is the melt flow index of the initial terpolymer (of between 2 and 15 g/10 min). The process for the manufacture of the biaxially oriented hollow bodies is by injection stretch blowmoulding. The biaxially oriented hollow bodies are used for packaging.

Abstract: A propylene block copolymer comprising(A) 60-90 weight %, based on the total amount of the block copolymer, of a first block of a propylene polymer, optionally containing a small amount of copolymerised ethylene,(B) 40-10 weight %, based on the total amount of the block copolymer, of a second block of an ethylene-propylene copolymer containing 1-10 weight % of ethylene, and the total ethylene content of the block copolymer being within the range of 0.1-2.5%. The weight process for the manufacturing of the propylene block copolymer and use of it for the manufacture of bioriented bottles.

Abstract: Composition for expanded granules, which comprises, per 100 parts by weight,from 60 to 90 parts by weight of a propylene homopolymer (A) having a melt flow index (MFI) from 0.1 to 20 g/10 min andfrom 40 to 10 parts by weight of a propylene random copolymer (B) containing from 3 to 20 mol % of ethylene and/or of an .alpha.-olefin having from 4 to 6 carbon atoms, the MFI of which ranges from 25 to 3000 g/10 min.Process for obtaining this composition and use of this composition for the manufacture of expanded granules and cellular articles obtained by molding these granules.

Abstract: A transmitter for multiplexing three optical channels at different wavelengths has (a) first, second and third laser diode means delivering linearly polarized optical beams at respective wavelengths .lambda.2, .lambda.3 and .lambda.4 which are mutually different; (b) an assembly located in the path of the light of wavelength .lambda.2 emitted by said first diode means and including a plate which is substantially quarter-wave for the wavelength (2 .lambda.2-.lambda.4), a filter having a band pass centered on wavelength .lambda.2, a plate quarter-wave which is substantially for wavelength .lambda.4 and a polarizer, the first diode means being oriented so that its beam is transmitted by the polarizer. A first light beam combiner directs light from said third diode means onto the polarizer along a direction of 90.degree. from the direction of the beam of wavelength .lambda.2 and with the same polarization direction, so that the beam of wavelength .lambda.4 is reflected towards said filter.