Process for the production of thermoplastic moulding compounds

Patent metadata

Field	Value
Publication number	US-10525439-B2
Application number	US-201615564586-A
Country	US
Kind code	B2
Filing date	Apr 11, 2016
Priority date	Apr 10, 2015
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

The invention relates to a process for the production of thermoplastic moulding compounds, in particular ABS, wherein at least a first reagent (11) and a second reagent (12) of the thermoplastic moulding compounds are fed to a gear pump (10) which comprises a housing and at least a first gear wheel that is rotatable relative to the housing about a first axis, and a second gear wheel that is rotatable relative to the housing about a second axis, wherein a loop conduit (29) is provided, and wherein the reagents (11, 12) are pressed in a loop through the loop conduit (29) and passing the gear wheels, whereby the reagents (11, 12) are dispersed to form a dispersion (15) in the gear pump (10). The invention also relates to a thermoplastic moulding compound that is produced by the inventive process.

First claim

The invention claimed is:

1. 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 poly-butadiene based rubber in the form of SAN grafted elastomer
of the thermoplastic moulding compounds are fed to a gear pump ( 10 ) which comprises a housing and
at least a first gear wheel that is rotatable relative to the housing about a first axis, and a second gear wheel that is rotatable relative to the housing about a second axis, wherein a loop conduit ( 29 ) is provided, wherein
the cross sectional area of the loop conduit ( 29 ) is changeable by means of a loop valve ( 35 ) arranged at the loop conduit ( 29 ), and wherein
the reagents ( 11 , 12 ) are pressed in a loop through the loop conduit ( 29 ) and
passing the gear wheels, whereby the reagents ( 11 , 12 ) are dispersed to form a dispersion ( 15 ) in the gear pump ( 10 ).

2. The process according to claim 1 , wherein the first reagent ( 11 ) styrene-acrylonitrile copolymer (SAN) is fed to the gear pump ( 10 ) in molten state.

3. The process according to claim 2 , wherein the first reagent ( 11 ) styrene-acrylonitrile copolymer (SAN) is heated above melting temperature.

4. The process according to claim 1 , wherein the second reagent ( 12 ) rubber is fed to the gear pump ( 10 ) as relatively fine powder having an average particle size of 10 to 1000 micrometer.

5. The process according to claim 1 , wherein the second reagent ( 12 ) rubber is fed to the gear pump ( 10 ) in molten state.

6. The process according to claim 1 , wherein at least one solvent is added to the reagents ( 11 , 12 ).

7. The process according to claim 6 , wherein the reagents ( 11 , 12 ) and the at least one solvent are first mixed to form a pre-mix, and the pre-mix is fed to the gear pump ( 10 ).

8. The process according to claim 7 , wherein the pre-mix is fed directly to the gear pump ( 10 ).

9. The process according to claim 7 , wherein the pre-mix is stored temporarily and is later fed to the gear pump ( 10 ).

10. The process according to claim 1 , wherein the dispersion ( 15 ) is processed further to form moulding compounds.

11. The process according to claim 1 , wherein the reagents ( 11 , 12 ) are pressed in loops through the loop conduit ( 29 ) from 10 times to 1000 times.

12. The process according to claim 1 , wherein
the first reagent ( 11 ) and the second reagent ( 12 ) are fed to a mixing vessel ( 50 ), and wherein
within the mixing vessel ( 50 ) a premixing of the reagents ( 11 , 12 ) proceeds to form a premix, and wherein
the resultant premix is then fed through an incoming valve ( 65 ) to an inlet ( 42 ) of the gear pump ( 10 ), and wherein
the reagents ( 11 , 12 ) and the dispersion ( 15 ) are fed through the loop conduit ( 29 ) back to the mixing vessel ( 50 ), and wherein
the loop conduit ( 29 ) connects an outlet ( 44 ) of the gear pump ( 10 ) to the mixing vessel ( 50 ).

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

• C08L55/02

  ABS [Acrylonitrile-Butadiene-Styrene] polymers · CPC title

• B29B7/7461

  Combinations of dissimilar mixers · CPC title

• B29B7/12

  with single shaft · CPC title

• B01J8/20

  with liquid as a fluidising medium · CPC title

• B01J19/1881

  externally, i.e. the mixture leaving the vessel and subsequently re-entering it · CPC title