公开(公告)号：DE2331306A1

公开(公告)日：1975-01-23

申请号：DE2331306

申请日：1973-06-20

Applicant: BASF AG

Inventor： TATZEL HERMANN ,  KOEGEL WOLFRAM ,  BECK GILBERT DIPL CHEM ,  ZUERN LUDWIG DIPL CHEM DR ,  CAESAR ARNDT

IPC: C08J9/22 ,  C08J9/236 ,  B29D27/00

Abstract: Foamed articles are made by compressing a mixt. of finely divided polyolefin with 0.3-4.0 g, per l, polyolefin, of a solvent-free curable blinder to 40-80% of the original bulk vol. of the mixt., whilst treating it with a gas of greater permeability coefft. than air. The polyolefin specif. has a crystallinity of >20 wt% at 25 degrees C and MFI 0.1-200 g/10 mins (190 degrees C/2.16 Kg, ASTM-D 1238-65T) and pref. is high pressure polyethylene of 0.918-0.935 g/cm3. The granules have an ave. dia. of 1-35 mm, pref. 3-20 mm and have a bulk density of 5-200 g/l, pref. 10-60 g/l. The binder is esp. a polyester or an epoxy resin, pref. in an amt. 0.6-2 g/l. The gas, (permeability coefft. measured to ASTM D 1434-63), is pret. ammonia or CO2, though (halogenated) hydrocarbons (b.pt. is not >15 degrees C) or CO may also be used. Compression is pref. to 50-70 vol%.