11.
    发明专利
    未知

    公开(公告)号:DE59901638D1

    公开(公告)日:2002-07-11

    申请号:DE59901638

    申请日:1999-03-19

    Applicant: BASF AG

    Abstract: A process prepares styrene polymers comprising water as sole blowing agent by mixing a polystyrene melt with water and with an emulsifying agent in an extruder, extruding the melt into a waterbath and pelletizing the cooled extrudate.

    12.
    发明专利
    未知

    公开(公告)号:AT207508T

    公开(公告)日:2001-11-15

    申请号:AT99913278

    申请日:1999-03-19

    Applicant: BASF AG

    Abstract: The invention relates to a process for preparing styrene polymers comprising water as sole blowing agent, by polymerizing styrene in aqueous suspension. The polymerization is carried out in the presence of from 5 to 30% by weight of recycled EPS material dissolved in styrene and comprising customary coating agents deriving from production of the EPS.

    18.
    发明专利
    未知

    公开(公告)号:DE19812854A1

    公开(公告)日:1999-09-30

    申请号:DE19812854

    申请日:1998-03-24

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing polystyrene foam particles, according to which polystyrene beads containing water as only inflating agent are expanded. The method comprises the following steps: a) the polystyrene beads are expanded at temperatures above 100 DEG C; b) the expanded beads are dried in dry air at between 20 and 95 DEG C for between 1 and 10 hours; c) the dried particles are expanded further at between 100 and 140 DEG C using water vapour; and d) steps b) and c) are repeated until the desired bulk density is obtained.

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