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公开(公告)号：DE2603510A1
公开(公告)日：1977-08-04
申请号：DE2603510
申请日：1976-01-30
Applicant: BASF AG
Abstract: The tendency of polyethylene films to stick together is reduced by applying to the film a 0.01-10 (0.01-5) wt. % dispersion of an ethylene polymer with melt index 0.1-50 g/10 minutes and with particles 5 mu and drying the film by evapn. of the water. The film is esp. of a low-density polyethylene (0.91-0.93 g/cc). The latex contains a polyethylene of density 0.918-0.935 g/cc, or a copolymer contg. 50-99.9 (90-99.9) moles % ethylene and 50-0.1% of a comonomer, esp. 10-0.1% of an acrylate ester, in partic. n-butyl or 2-ethylhexyl acrylate. The latex may contain a dispersant, e.g. 0.1-5 wt. % of a Na alkylsulphonate, and has pH 3-12 (5-11). The particle size is pref. 1 (0.01-1) mu. The optical properties, e.g. gloss, of the film are not affected. The dispersion coating adheres well to the film and does not affect processing.
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公开(公告)号：DE2631834A1
公开(公告)日：1978-01-19
申请号：DE2631834
申请日：1976-07-15
Applicant: BASF AG
Inventor： BECKER ROLF DIPL ING DR , BORHO KLAUS DIPL ING DR , BUECHNER OSKAR DIPL CHEM DR , GROPPER HANS DIPL CHEM DR , HARTIG ULRICH DIPL CHEM DR
Abstract: The invention relates to a process for rapidly letting-down the pressure in continuous high pressure polymerization systems for the polymerization of ethylene. In this process, the let-down hot reaction mixture is passed into an expansion vessel in such a way that the jet of let-down hot reaction mixture issuing from the let-down line is led into the partially water-filled expansion vessel at an angle of from 0 DEG to 45 DEG to the water surface, so that the jet does not enter below the surface but must touch or strike it. The method described makes it possible to let the mixture down partially and thus to slow down the decomposition in the case of explosive decomposition reactions occurring in the polymerization system.
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公开(公告)号：DE2557653A1
公开(公告)日：1977-06-30
申请号：DE2557653
申请日：1975-12-20
Applicant: BASF AG
Inventor： URBAN FRIEDRICH DIPL CHEM DR , BUECHNER OSKAR DIPL CHEM DR , HARTIG ULRICH DIPL CHEM DR , GROPPER HANS DIPL CHEM DR
Abstract: Ethylene polymers are manufactured in a tubular reactor under high pressure and at high temperatures in the presence of polymerization initiators. The polymerization is carried out in two different zones of the reactor, a mixture of ethylene, oxygen and regulator being fed into the first zone and a co-initiator having a half-life temperature, measured in benzene, of above 140 DEG C being additionally fed into the second zone. The co-initiator may be a peroxide or a hydroperoxide. The melt index, or the haze and gloss of a film produced from the resulting ethylene polymer, can be varied advantageously through the choice of the co-initiator.
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