公开(公告)号：DE3122180A1

公开(公告)日：1982-12-23

申请号：DE3122180

申请日：1981-06-04

Applicant: BASF AG

Inventor： HAMBRECHT JUERGEN DIPL CHEM DR ,  LINDENSCHMIDT GERHARD DIPL CHE ,  JUNG RUDOLF H DIPL CHEM DR ,  SCHILLINGER BERNHARD DIPL ING ,  KRESS GERHARD DIPL ING ,  ECHTE ADOLF DIPL CHEM DR ,  JENNE HELMUT DIPL CHEM DR

IPC: C08J9/12 ,  B29D27/00 ,  C08L25/16 ,  C08L33/20

Abstract: The invention relates to a process for the production of foams by melting a thermoplastic, mixing the melt with a volatile blowing agent under a pressure of from 25 to 250 bar, decompressing the mixture to atmospheric pressure, and cooling the foam. The plastic employed is a copolymer comprising from 67 to 73 % by weight of alpha -methylstyrene and from 33 to 27 % by weight of acrylonitrile having a viscosity index of from 45 to 70 ml.g . The resultant foams of high heat distortion resistance can be used as insulating materials.

公开(公告)号：DE2312123A1

公开(公告)日：1974-09-12

申请号：DE2312123

申请日：1973-03-10

Applicant: BASF AG

Inventor： NOETZEL WOLFRAM DIPL CHEM DR ,  LINDNER EDMUND DIPL ING ,  KRESS GERHARD DIPL ING

IPC: B29C47/00 ,  B29C48/90 ,  B29D7/02

Abstract: In mfr. of plastics tubular film where a prim. tubular film is produced by (A) extrusion of plastics through an annular die, the plastic having a temp. > m.pt. and the prim. tube having 2-300 cm. dia and 20-1500 mu wall thickness; (B) cooling the prim. tube immediately before it issues from the die without altering its dimensions; and (C) blowing it to 4-3000 cm dia. immediately after it has issued from a cooling device; the cooling device for the external cooling of the prim. tube comprises (I) an internal tube of sintered porous material (1) having inner dia. 2-300 cm. wall thickness 1-10mm, and pore distances of 5-200 m mu; (II) a jacket (2) snugly fitting the (1) - except the bottom part thereof - which serves to receive a liq. cooling medium; and (III) a channel (3) to receive a liq. lubricant, the (3) surrounding the (1) at its bottom section and being connected with it. The cooling device as claimed is of rel. simple design and affords trouble-free operation.