公开(公告)号：BR0212974A

公开(公告)日：2004-10-13

申请号：BR0212974

申请日：2002-10-01

Applicant: BASF AG

Inventor： DATKO ACHIM ,  HAHN KLAUS ,  LEHNEN UWE-JOHANNES ,  LLNER KNUT Z

IPC: C08J9/00 ,  C08J9/20

Abstract: The invention relates to a method for the production of styrene polymers by polymerization of styrene in the presence of graphite particles and several peroxides which decompose at various temperatures, whereby one thereof has a half-life value of 1 hour at 50 up to less than 70 DEG C.

公开(公告)号：DE10150405A1

公开(公告)日：2003-04-17

申请号：DE10150405

申请日：2001-10-11

Applicant: BASF AG

Inventor： DATKO ACHIM ,  HAHN KLAUS ,  LEHNEN UWE-JOHANNES ,  ZOELLNER KNUT

IPC: C08J9/00 ,  C08J9/20 ,  C08F12/08

Abstract: In the preparation of expanded polystyrene(EPS) in the presence of graphite particles and at least two peroxides which are broken down to radicals during the first stage of aqueous suspension polymerization, early polymerizate formation occurs and hinders a critical decrease in viscosity when the temperature rises, although the peroxides are not sufficiently stable unless cooled to room temperature. In the preparation of expanded polystyrene(EPS) in the presence of peroxides which are broken down to radicals during the first stage of aqueous suspension polymerization early polymerizate formation occurs and a critical decrease in viscosity when the temperature rises is hindered, although the peroxides are not sufficiently stable unless cooled to room temperature. The styrene mixture with up to 20% by wt. of comonomers in aqueous suspension is polymerized in the presence 0.1-25 wt.% of graphite particles and at least two organic peroxides breaking down at different temperatures.