Process for the production of thermoplastic moulding compounds

Patent metadata

Field	Value
Publication number	US-2018178411-A1
Application number	US-201615735286-A
Country	US
Kind code	A1
Filing date	Jun 9, 2016
Priority date	Jun 12, 2015
Publication date	Jun 28, 2018
Grant date	—

Abstract

The invention relates to a process for the production of thermoplastic moulding compounds, in particular for the production of acrylonitrile-butadiene-styrene (ABS), wherein at least a first reagent ( 11 ) and a second reagent ( 12 ) of the thermoplastic moulding compounds are fed to a loop conduit ( 29 ) which comprises a static mixer ( 36 ), wherein the reagents ( 11, 12 ) are pressed in loops through the loop conduit ( 29 ) and passing the static mixer ( 36 ), whereby the reagents ( 11, 12 ) are dispersed to form a dispersion ( 15 ) in the static mixer ( 36 ). The invention also relates to a thermoplastic moulding compound that is produced by the inventive process.

First claim

1 - 17 . (canceled)

18 . A process for the production of acrylonitrile-butadiene-styrene (ABS), wherein
at least a first reagent ( 11 ) that contains or consists of styrene-acrylonitrile copolymer (SAN) and a second reagent ( 12 ) that contains or consists of rubber, in particular in the form of SAN grafted elastomer of the thermoplastic moulding compounds are fed to a loop conduit ( 29 ) which comprises at least one static mixer ( 36 ), wherein at least one solvent is added to the reagents ( 11 , 12 ), wherein the reagents ( 11 , 12 ) and the at least one solvent are first mixed to form a premix, and the premix is fed to the loop conduit ( 29 ), wherein the reagents ( 11 , 12 ) are pressed in loops through the loop conduit ( 29 ) and passing the static mixer ( 36 ), whereby the reagents ( 11 , 12 ) are dispersed to form a dispersion ( 15 ) in the static mixer ( 36 ), and wherein the premix is pressed through the static mixer ( 36 ) back to a mixing vessel ( 50 ), in which the premix has been formed.

19 . The process according to claim 18 , wherein the first reagent ( 11 ) styrene-acrylonitrile copolymer (SAN) is fed to the loop conduit ( 29 ) in a molten state.

20 . The process according to claim 19 , wherein the first reagent ( 11 ) styrene-acrylonitrile copolymer (SAN) is heated above melting temperature.

21 . The process according to claim 18 , wherein the second reagent ( 12 ) rubber is fed to the loop conduit ( 29 ) as relatively fine powder, in particular having an average particle size of 10 to 1000 micrometer.

22 . The process according to claim 18 , wherein the second reagent ( 12 ) rubber is fed to the loop conduit ( 29 ) in a molten state.

23 . The process according to claim 18 , wherein the premix is fed directly into the loop conduit ( 29 ).

24 . The process according to claim 18 , wherein the premix is stored temporarily and is later fed to the loop conduit ( 29 ).

25 . The process according to claim 18 , wherein the reagents ( 11 , 12 ) are pressed in loops through the loop conduit ( 29 ) from 1 time to 100 times.

26 . The process according to claim 18 , wherein the reagents ( 11 , 12 ) are pressed in loops through the loop conduit ( 29 ) by means of a pump ( 10 , 70 , 80 ).

27 . The process according to claim 18 , wherein the reagents ( 11 , 12 ) are dispersed at a temperature at a range of 160° C. to 250° C., in particular at a range of 190° C. to 210° C.

28 . The process according to claim 18 , wherein the dispersion ( 15 ) is processed further to form moulding compounds, in particular to form acrylonitrile-butadiene-styrene (ABS).

29 . The process according to claim 18 , wherein
the premix is fed to an inlet ( 42 ) of a first pump ( 10 ) while an outgoing valve ( 67 ) for taking the dispersion ( 15 ) out of the loop conduit ( 29 ) is closed, wherein the premix is forwarded in loops through the loop conduit ( 29 ) towards the static mixer ( 36 ) by means of the first pump ( 10 ), and wherein after a certain number of loops within the loop conduit ( 29 ), the outgoing valve ( 67 ) is opened and the dispersion ( 15 ) is pressed out of the loop conduit ( 29 ) and delivered through the outgoing valve ( 67 ) by means of the first pump ( 10 ).

30 . The process according to claim 29 , wherein
the outgoing valve ( 67 ) is arranged at a branch downstream of the mixing vessel ( 50 ) and upstream of the first pump ( 10 ).

31 . Acrylonitrile-butadiene-styrene (ABS), produced by the process according to claim 18 .

Assignees

• Ineos Styrolution Group Gmbh

Inventors

• Ahn Sangjun
• Fischer Wolfgang
• Niessner Norbert
• Banaszak Brian J
• Walker Roland
• El-Jaby Ula
• Stammer Achim
• Hungenberg Klaus-Dieter
• Hisgen Bernd

Classifications

• B29B7/7466

  Combinations of similar mixers · CPC title

• B29B7/60

  for feeding, e.g. end guides for the incoming material {(B29B7/7615 takes precedence; feeding predetermined amounts for mixing in general B01F35/714)} · CPC title

• C08F257/02

  on to polymers of styrene or alkyl-substituted styrenes · CPC title

• B29K2055/02

  ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers · CPC title

• B29B7/7495

  for mixing rubber · CPC title