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Mixtures of thermoplastic polymers in powder form
| Details |
Inventors: Piejko, Karl-Erwin; Lindner, Christian; Ostarek, Ralph; Braese, Hans-Eberhard; Ott, Karl-Heinz;
Assignee: Bayer AG (Leverkusen, DE)
Primary Examiner: Marquis; Melvyn I.
Assistant Examiner: Clark; W. R. M.
Attorney, Agent or Firm: Connolly and Hutz
Process for the preparation of mixtures of thermoplastic polymers in powder form from aqueous emulsions of a) particulate, partly crosslinked rubber-like copolymers of a C.sub.2 -C.sub.8 -alkyl acrylate and/or butadiene with (based on the copolymer) up to 40 wt. % acrylonitrile, styrene or C.sub.1 -C.sub.4 -alkyl methacrylate, b) a thermoplastic resin, and if appropriate c) a rubber-rich graft polymer of styrene, .alpha.-methylstyrene, acrylonitrile, methyl methacrylate and/or alkyl acrylate on a diene or alkyl acrylate rubber having a rubber content of 50 to 95 wt. %, wherein aqueous emulsions of a) and b) and if appropriate c) having polymer contents of 15 to 50 wt. % are mixed with a coagulate solution simultaneously, but in separate streams, continuously or semi-continuously at 20.degree. to 100.degree. C., the polymers a) and b) and if appropriate c) being coagulated, the streams are combined and the polymer mixture is then separated off. |
|
DETAILED DESCRIPTION We claim: 1.
A process for the preparation of mixtures of thermoplastic polymers in powder form from aqueous emulsions of a) particulate, partly cross-linked rubber-like copolymers of a C.
sub.
2 -C.
sub.
8 -alkyl acrylate and/or butadiene with (based on the copolymer) up to 40 wt.
% acrylonitrile, styrene or C.
sub.
1 -C.
sub.
4 -alkyl methacrylate, which have average particle diameters (d.
sub.
50) of 0.
08 to 1.
0 .
mu.
m and gel contents of 40 to 99 wt.
% and b) a thermoplastic resin which is a homo- or co-polymer of styrene .
alpha.
-methylstyrene, methyl methacrylate or acrylonitrile, consisting essentially of: separately but simultaneously feeding into a single reactor containing a coagulation solution an aqueous emulsion of a) and an aqueous emulsion of b), having polymer contents of 15 to 50 wt.
%; mixing the emulsions a) and b) in the coagulation solution while the coagulates of emulsions a) and b) are forming at 20.
degree.
to 100.
degree.
C.
; and separating off the coagulated polymer mixture.
2.
The process of claim 1 wherein 30 to 98 wt.
% aqueous emulsion a) and 2 to 70 wt.
% aqueous emulsion b), based on a) and b), are employed.
3.
The process of claim 1 wherein the emulsions a) and b) in the coagulation solution are mixed by stirring.
4.
A process for the preparation of mixtures of thermoplastic polymers in powder form from aqueous emulsions of a) particulate, partly cross-linked rubber-like copolymers of a C.
sub.
2 -C.
sub.
8 -alkyl acetate and/or butadiene with (based on the copolymer) up to 40 wt.
% acrylonitrile, styrene or a C.
sub.
1 -C.
sub.
4 -alkyl methacrylate, which have average particle diameters (d.
sub.
50) of 0.
08 to 1.
0 .
mu.
m and gel contents of 40 to 99 wt.
% and b) a thermoplastic resin which is a homo- or co-polymer of styrene, .
alpha.
-methylstyrene, methyl methacrylate or acrylonitrile and contains up to 30 wt.
% of a rubber, and c) a rubber-rich graft polymer of styrene, .
alpha.
-methylstyrene, acrylonitrile methyl methacrylate and/or alkyl acrylate on a diene or alkyl acrylate rubber having a rubber content of 50 to 95 wt
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