Polyolefins functionalized with maleic anhydride (I) and at least one of its high-boiling esters are prepd. in high yields, with high degrees of functionalization, without the prodn. of byproducts of crosslinking or degrdn. The process, which may be carried out either continuously or discontinuously, is characterized by the use of inorg. substances having a specific porosity, grain size, d. and humidity, as vehicles of the functionalizing monomers; the presence of maleic ester contributes to enhancing the reaction efficiency. Also described are a double-screw extruder for carrying out the process, and the use of products obtained as compatibilizing additives in adhesives and reinforcing polymers. Thus, a functionalizing mixt. of di-Et maleate 0.6, I 2, dicumyl peroxide 0.18 kg adsorbed on 0.35 kg hydrophobic silica (99% purity, av. particle size 5 μm, surface area 280 m2/g, water content 0.4 wt.%, bulk d. 0.185 g/cm3) and dild. with 2 kg powd. HDPE, and EPR CO 038 (28% propylene) were fed through an extruder at 5 and 175 kg/h, resp., giving MFI 0.65, Mw/Mn 3.0, I functionality 0.9%, and functional efficiency 82%, compared with 1.5, 3.4, 0.45, and 48, resp., without the di-Et maleate. A molding from a 65:35 mixt. of nylon 6 and the above functionalized EPR showed Izod impact strength 1020 J/m at 23° and 1016 J/m at -20°, compared with 34 and 29, resp., for nylon 6 alone, and 750 and 340, resp., for an 80:20 nylon 6-FM 1 (com. impact modifier of 0.9%-maleated ethylene-propene copolymer).
Polyolefins functionalized with maleic anhydride and with its high-boiling liquid esters, preparation thereof, and use as compatibilizers
RUGGERI, GIACOMO;
1999-01-01
Abstract
Polyolefins functionalized with maleic anhydride (I) and at least one of its high-boiling esters are prepd. in high yields, with high degrees of functionalization, without the prodn. of byproducts of crosslinking or degrdn. The process, which may be carried out either continuously or discontinuously, is characterized by the use of inorg. substances having a specific porosity, grain size, d. and humidity, as vehicles of the functionalizing monomers; the presence of maleic ester contributes to enhancing the reaction efficiency. Also described are a double-screw extruder for carrying out the process, and the use of products obtained as compatibilizing additives in adhesives and reinforcing polymers. Thus, a functionalizing mixt. of di-Et maleate 0.6, I 2, dicumyl peroxide 0.18 kg adsorbed on 0.35 kg hydrophobic silica (99% purity, av. particle size 5 μm, surface area 280 m2/g, water content 0.4 wt.%, bulk d. 0.185 g/cm3) and dild. with 2 kg powd. HDPE, and EPR CO 038 (28% propylene) were fed through an extruder at 5 and 175 kg/h, resp., giving MFI 0.65, Mw/Mn 3.0, I functionality 0.9%, and functional efficiency 82%, compared with 1.5, 3.4, 0.45, and 48, resp., without the di-Et maleate. A molding from a 65:35 mixt. of nylon 6 and the above functionalized EPR showed Izod impact strength 1020 J/m at 23° and 1016 J/m at -20°, compared with 34 and 29, resp., for nylon 6 alone, and 750 and 340, resp., for an 80:20 nylon 6-FM 1 (com. impact modifier of 0.9%-maleated ethylene-propene copolymer).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
