公开(公告)号：DE3037682A1

公开(公告)日：1982-05-19

申请号：DE3037682

申请日：1980-10-04

Applicant: BASF AG

Inventor： SCHLEMMER LOTHAR ING GRAD ,  HEIM EDUARD ,  BLECKMANN GERHARD ING GRAD ,  BERBNER HEINZ ING GRAD ,  KETTERER PETER DIPL ING

IPC: C08J9/14 ,  C08L61/28 ,  C08J5/02 ,  C08J9/04

Abstract: In the parent patent an elastic melamine-HCHO resin foam is prepd. by foaming an aq. soln. or dispersion contg. a melamine-HCHO prepolymer, an emulsifier, a volatile blowing agent, a hardener, and opt. other conventional additives and then hardening. In this addn., the aq. soln. or dispersion is prepd. continuously in a mixer with a pre-mixing zone (A), an intensive mixing zone (B), a kneading zone (C) and a take-off zone (D). A melamine-HCHO prepolymer powder is fed separately to (A) and then 70-98% of the total amt. of water. in (B) the prepolymer and water are mixed and at the end of the zone, the liq. blowing agent and a soln. of the hardener and emulsifier opt. with the other additives in the rest of the water are added separately. The additives are mixed with the compsn. in (C). The take-off pressure in (D) is 1.1-5.0 bar. The temp. of the compsn. in zone (A) is not greater than 30 deg.C and in the other zones not greater than 25 deg.C. The process provides a homogeneous mixt. for foaming.

公开(公告)号：DE2719905A1

公开(公告)日：1978-11-16

申请号：DE2719905

申请日：1977-05-04

Applicant: BASF AG

Inventor： HINSELMANN KLAUS DIPL ING ,  WEBER HEINZ DIPL CHEM DR ,  BLECKMANN GERHARD ING GRAD ,  WINKENS HELMUT

IPC: B29C44/50 ,  C08J3/24 ,  C08J9/34 ,  B29D27/00

Abstract: Parent Patent discloses the continuous prepn. of foamed profiles, having thickness 1-200 mm, by (A) homogenising a mixt. contg. (a) an olefin polymer, (b) 1-30 wt. % solid organic blowing agent, decomposing on heating to generate inorganic gases, (c) 0.1-10 wt. % organic peroxide and opt. (d) 0.1-10 wt. % foaming auxiliaries, crosslinking promoters and standard additives; (B) crosslinking and foaming the olefin polymer in a foaming zone, at 160-280 degrees C; and (C) extruding the foam from foaming zone, with cooling and solidifying. In foaming zone, pressure is 5-150 bar. Ratio of foaming zone length: max. thickness is 100-2000:1. The improvement comprises applying an additional organic peroxide, c', to the surface of the homogenised mixt. of (A) before entering into foaming zone. c' is pref present at 0.001-0.1 wt. % w.r.t. (a+b+c+d)mixt. Peroxide c' is pref. added together with a lubricant, opt. contg. a solubiliser, e.g. a lower alcohol, for c'. The stronger outer skin allows the prepn. of extrudable foamed profiles having a lower gel content, e.g. 10-30 wt. %.

公开(公告)号：DE2654029A1

公开(公告)日：1978-06-01

申请号：DE2654029

申请日：1976-11-27

Applicant: BASF AG

Inventor： WEBER HEINZ DIPL CHEM DR ,  HINSELMANN KLAUS DIPL ING ,  BLECKMANN GERHARD ING GRAD

IPC: C08J9/04 ,  B29C44/50 ,  C08J5/18 ,  C08J9/00 ,  C08J9/06 ,  B29D27/00

公开(公告)号：DE3138862A1

公开(公告)日：1982-05-19

申请号：DE3138862

申请日：1981-09-30

Applicant: BASF AG

Inventor： KAEPPEL HANSHELMUT ING GRAD ,  BLECKMANN GERHARD ING GRAD ,  KOERNER HEINZ-HERMANN

IPC: C08J9/36 ,  C08L61/28 ,  B29G7/02 ,  C08J3/24 ,  C08J9/04 ,  C08J9/28

Abstract: The invention relates to a process for the preparation of elastic foams from melamin-formaldehyde condensation products by foaming a blowing agent-containing melamin resin solution, curing the foam and conditioning the cured foam at temperatures between 120 and 250 DEG C. The conditioning is carried out by passing from 500 to 10,000 m of hot gas through each m of foam.

公开(公告)号：DE2603765A1

公开(公告)日：1977-08-04

申请号：DE2603765

申请日：1976-01-31

Applicant: BASF AG

Inventor： WELZ MARTIN DIPL ING ,  BLECKMANN GERHARD ING GRAD ,  WURMB ROLF DIPL CHEM DR

IPC: F16L9/12 ,  F16L9/16

Abstract: A tube has its walls made up from layers of fibrous sheets impregnated with a thermoplastic (I). Pref. the (I) impregnated sheets are wound, at a temp. > m.pt. of (I), around an internal former as one or more overlapping layers, then compressed at 5-300N/cm using a tension tape made of heat-stable films. Opt. a preformed strip of hard foam is introduced between the layers and an endless glass fibre may be wound on simultaneously. The tubes are made quickly and easily and have good and uniform qualities esp. strength. Typical plastics are polyethylene, polypropylene, styrene (co)polymers, PVC etc, and the fabric is e.g. a mat, fleece, or web of glass-, C- plastics or asbestos-fibres coated with usual polymeric binders.

公开(公告)号：DE2428382A1

公开(公告)日：1976-01-02

申请号：DE2428382

申请日：1974-06-12

Applicant: BASF AG

Inventor： WEBER HEINZ DIPL CHEM DR ,  HINSELMANN KLAUS DIPL ING ,  BLECKMANN GERHARD ING GRAD

IPC: B29C44/30 ,  B29D27/00

Abstract: A continuous web of foamed polyolefin partic. polyethylene is produced by extruding activated and catalysed polymer into the end of a long channel which is bordered with endless belts, heating to reaction temp. moving between the belts and foaming under pressure of 30-70 kP/cm2. Provides a practicable method of producing fine-cell polyolefin foam continuously.