Process for production of polypropylene sheets or films

Details Process for production of polypropylene sheets or films Process for production of polypropylene sheets or films

B - Operations, Transporting

29

C

B29C 39/14 (2006.01) B29C 43/22 (2006.01) B29C 47/88 (2006.01) B29C 59/04 (2006.01) C08J 5/18 (2006.01) C08K 3/00 (2006.01) C08K 5/00 (2006.01) C08K 5/14 (2006.01) C08L 23/10 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2059090

ABSTRACT OF THE DISCLOSURE The present invention relates to a process for producing a polypropylene sheet or film which comprises passing a molten sheet or film of a polypropylene composition, the composition comprising polypropylene and at least one additive selected from the group consisting of a nucleating agent, a finely powdered high melting point polymer, a petroleum resin, a terpene resin, an organic peroxide and a crystalline propylene-based copolymer, between two cooling rolls opposite to each other, the rolls being maintained at a temperature of 10 to 50 °C , and being subjected to specular finishing treatment , and adapted so as to oonvey therebetween a metallic endless belt having a surface roughness of not more than 1.5µ m under tension , while carrying the sheet or film on the endless belt. In accordance with the present invention, there can be ob- tained a polypropylene sheet or film excellent in transparency and surface gloss although not stretched. The sheet or film obtained is good in transparency and sur- face gloss even though it is thick-walled. Moreover the present invention permits to produce the sheet or film as described above at a high speed, and it has an advan- tape of being excellent in productivity because the process can be carried out at relatively high temperatures compared with water cooling, for example.

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