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：DE2846757A1

公开(公告)日：1980-05-08

申请号：DE2846757

申请日：1978-10-27

Applicant: BASF AG

Inventor： BOOTZ LUDWIG ,  OHLIG HILMAR ,  HINSELMANN KLAUS DIPL ING ,  SCHLEMMER LOTHAR ING GRAD

IPC: C08F6/22 ,  C08J3/12 ,  C08J3/16 ,  B29F5/00 ,  C08J3/14 ,  C08L51/04

Abstract: A dispersion of styrene-acrylonitrile graft copolymer on a rubber-elastic polymer and a pptnt. are introduced into the pptn. zone of a tubular reactor comprising a pptn. zone, a sintering zone and a discharge zone. The reactor contains rotating supply- and mixer-units and its length: dia. ratio is 10:50. The tempo. is 20-150 degrees C in pptn. zone, 80-240 degrees C in sintering zone and o0-180 degrees C in discharge zone, provided that in sintering zone the temp. is kept at 30-90 degrees C above the temp. in pptn. zone and in discharge zone, the temp. is kept at 30-120 degrees C below the temp. in sintering zone. Average polymer dwelling time in reactor is 0.5-10 mins. Dwelling time in each of pptn.-, sintering- and discharge zone is 1/5 to 1/2 of total dwelling times and the dwelling times in the zone add up to 1. The pressure in pptn. - and sintering-zones corresponds to the liq. phase vapour pressure at the prevailing temp. The total liq. and polymer phase vol. is 10-100% of the free reactor vol. Finally, the liq. phase and sintered polymer mixt. is discharged through the discharge zone. The particles obtd. are used as additives to improve the toughness of styrene-acrylonitrile polymers. The polymer dispersion is self-sealing so that sintering zone pressure can lie above surrounding pressure without the need for a pressure-valve.