3.
    发明专利
    未知

    公开(公告)号:DE59609686D1

    公开(公告)日:2002-10-24

    申请号:DE59609686

    申请日:1996-12-04

    Applicant: BASF AG

    Abstract: The preparation of polyolefin foam particles of bulk density 20 - 100 g / l comprises: (A) pre-foamed particles of bulk density 120 - 400 g / l are prepared by extrusion and granulation of polyolefin containing propellent ; and (B) the particles are further foamed in one or more steps without the use of propellent, by treating with 1.5 - 8 bar steam for 5 - 120 seconds at 110 - 170 degrees C.

    7.
    发明专利
    未知

    公开(公告)号:DE59711590D1

    公开(公告)日:2004-06-09

    申请号:DE59711590

    申请日:1997-07-15

    Applicant: BASF AG

    Abstract: Expandable polystyrene (EPS) containing blowing agent also contains 0.1-20 wt.% of a blowing aid comprising an oligomeric aliphatic 2-20C olefin (I) and a number average degree of polymerisation (DP) of 2-200, which is liquid at room temperature. Also claimed are methods of producing expandable polystyrene beads.

    8.
    发明专利
    未知

    公开(公告)号:DE50101699D1

    公开(公告)日:2004-04-22

    申请号:DE50101699

    申请日:2001-12-14

    Applicant: BASF AG

    Inventor: LAUSBERG DR HAHN DR

    Abstract: The invention relates to a process for the production of styrene polymers containing water as expanding agent by suspension polymerization of styrene in the presence of an emulsifying auxiliary, the suspending agent being a mixture of water and an organic liquid which is water-miscible and which is virtually a non-solvent for polystyrene and has a boiling point below 100° C.

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