公开(公告)号：DE2734607A1

公开(公告)日：1979-02-15

申请号：DE2734607

申请日：1977-08-01

Applicant: BASF AG

Inventor： GUHR UWE DIPL CHEM DR ,  MOELLER ROLF DIPL CHEM DR ,  STAHNECKER ERHARD DIPL CHEM DR ,  KNIESE WILHELM DIPL CHEM DR

IPC: C08F257/02 ,  C08J9/20 ,  C08F112/08

公开(公告)号：DE2733471A1

公开(公告)日：1979-02-15

申请号：DE2733471

申请日：1977-07-25

Applicant: BASF AG

Inventor： KNIESE WILHELM DIPL-CHEM DR ,  KEPPLER HANS GEORG DIPL ING DR ,  MOELLER ROLF DIPL CHEM DR ,  GUHR UWE DIPL CHEM DR

IPC: C08F2/00 ,  C02F1/00 ,  C08F2/18 ,  C08F6/00 ,  C08F6/06 ,  C08F12/08 ,  C08F112/08 ,  C08J11/04

公开(公告)号：DE2621448A1

公开(公告)日：1977-12-01

申请号：DE2621448

申请日：1976-05-14

Applicant: BASF AG

Inventor： GUHR UWE DIPL CHEM DR ,  STAHNECKER ERHARD DIPL CHEM DR ,  MOELLER ROLF DIPL CHEM DR ,  SCHICK RUPERT DIPL CHEM DR

IPC: C08J9/00 ,  C08J9/18 ,  C08J9/22 ,  C08L25/06 ,  C08J9/16

Abstract: Spherical, expandible styrene polymers are obtd. by suspending rod-shaped granules of styrene polymers, opt. mixed with 10-90 wt.% of other thermoplastic synthetics, in water contg. a suspending agent, and keeping the granules moving, pref. by stirring, while heating the suspension at above the softening point, for >30 mins. (1-5 hours) and at a press of is not >14 bars (7-10 bars). Granules of uniform size can be obtd. in any required amt. and dimension. Prods. of grain dia. 0.5-0.6 mm, suitable for prodn. of thin-walled goods, can be prepd. Moulds can be filled easily with the spherical granules. The process is esp. suitable for preparing light-fast, pigmented expandible styrene polymers. Opt. the initial granules may contain additives, but no blowing agent; the spherical particles are later impregnatred with the blowing agent.

公开(公告)号：DE2553299A1

公开(公告)日：1977-06-08

申请号：DE2553299

申请日：1975-11-27

Applicant: BASF AG

Inventor： STAHNEKCER ERHARD DIPL CHEM DR ,  MOELLER ROLF DIPL CHEM DR ,  GUHR UWE DIPL CHEM DR

IPC: C08J9/22 ,  C08L25/04 ,  C08J9/16

Abstract: Process for lowering blowing agent content of expandable beads of styrene (co)polymer contg. >=50 wt. % styrene comprises stirring fractions of bead particles contg. 2-12 (6-8) wt. % blowing agent or mixts. of such fractions in liq. phase, either without applied press. at 40-70 (50) degrees C or under 3-10 (4-6) bar at 90-130 (90-110) degrees C. Treatment is continued until desired blowing agent quantity is achieved esp. 1-6 wt. %. Press. and temp. are determined so as to accelerate blowing agent diffusion from polymer particles while avoiding partial foaming of material. Uniform prods. are formed having a uniform foam structure is prefoamed condition. Process may take place in the presence of an (in) organic dispersant. Blowing agents sused are lower-boiling opt. halogenated aliphatic cpds. or cycloaliphatic cpds. which do not attack polymer and which boil below styrene polymer b. pt. The styrene (co)polymer particles contain further additives, e.g. plasticisers, stabilisers, liquids, soluble dyes or pigments or flameproofing agents.

公开(公告)号：DE2534833A1

公开(公告)日：1977-02-24

申请号：DE2534833

申请日：1975-08-05

Applicant: BASF AG

Inventor： MOELLER ROLF DIPL CHEM DR ,  GUHR UWE DIPL CHEM DR ,  STAHNECKER ERHARD DIPL CHEM DR

IPC: C08J9/00 ,  C08J9/18 ,  C08J9/22 ,  C08L25/06 ,  C08J9/16

Abstract: Spherical, expandible styrene polymers are obtd. by suspending rod-shaped granules of styrene polymers, opt. mixed with 10-90 wt.% of other thermoplastic synthetics, in water contg. a suspending agent, and keeping the granules moving, pref. by stirring, while heating the suspension at above the softening point, for >30 mins. (1-5 hours) and at a press of is not >14 bars (7-10 bars). Granules of uniform size can be obtd. in any required amt. and dimension. Prods. of grain dia. 0.5-0.6 mm, suitable for prodn. of thin-walled goods, can be prepd. Moulds can be filled easily with the spherical granules. The process is esp. suitable for preparing light-fast, pigmented expandible styrene polymers. Opt. the initial granules may contain additives, but no blowing agent; the spherical particles are later impregnatred with the blowing agent.