Maro Publications

Olefin Polymerization ©

From 01/14/2015 to xx/xx/xxxx


Patent Abstracts

Patent Titles


Maro Encyclopedia






Patent Titles

For earlier US Patent titles, go to Sorted Patents /Reactions /Olefin Polymerization.


Catalyst for high temperature olefin polymerization 


Carboxylate metal complex and catalyst for olefin polymerization 

Catalyst composition for olefin polymerization and preparation method for polyolefin using the same 


Polymerization product pressures in olefin polymerization 


Polyethylene and process for production thereof 

Process for olefin polymerisation using group 4 metallocene as catalysts 


Oligomerisation of olefinic compounds with reduced polymer formation 


63. 8,580,902 
Catalyst system, process for olefin polymerization, and polymer compositions produced therefrom 

62. 8,580,703 
Additive component for the improvement of the performance of olefin polymerisation catalysts 


61. 8,575,285 
Catalyst for living radical polymerization 

60. 8,575,284 
Aluminoxane catalyst activators derived from dialkylaluminum cation precursor agents, processes for making same, and use thereof in catalysts and polymerization of olefins 

59. 8,575,283 
Heterocyclic organic compounds as electron donors for polyolefin catalysts 


58. 8,569,433 
Energy efficient polyolefin process 

57. 8,569,195 
Internal and external donor compounds for olefin polymerization catalysts II 

56. 8,569,194 
Catalyst composition for polymerization of olefins, polymerization process using the same, and method for its preparation 


55. 8,563,669 
Olefin polymerization reactor, polyolefin production system, and polyolefin production process 

54. 8,563,647 
Multiple catalyst system for olefin polymerization and polymers produced therefrom 


53. 8,557,932 
Process for the preparation of a multimodal polyolefin polymer with improved hydrogen removal 


52. 8,546,290 
Solid catalyst component for olefin polymerization, manufacturing method, and catalyst and olefin polymer manufacturing method 

51. 8,546,289 
Solid catalyst component for olefin polymerization, catalyst for olefin polymerization and process for producing olefin polymer 


50. 8,541,333 
Catalyst component for olefin polymerization and a catalyst comprising the same 

49. 8,541,332 
Catalyst for polymerization of olefins comprising thienyl-substituted silanes 


48. 8,530,586 
Method for preparing polyolefins containing a high percentage of exo-olefin chain ends 


47. 8,524,930 
Class of olefin metathesis catalysts, methods of preparation, and processes for the use thereof 


46. 8,519,070 
Post-metallocene complexes based on bis(naphthoxy)pyridine and bis(naphthoxy)thiophene ligands for the polymerisation of ethylene and alpha-olefins


45. 8,507,706 
Metallocene compounds, catalysts comprising them, process for producing an olefin polymer by use of the catalysts, and olefin homo- and copolymers 


44. 8,501,881 
Process for olefin polymerization

43. 8,501,655 
Catalyst activators, processes for making same, and use thereof in catalysts and polymerization of olefins


42. 8,497,329 
Methods of controlling polymer properties 

41. 8,497,328 
Catalyst components for the polymerization of olefins and catalysts therefrom obtained 


40. 8,487,059 
Synthesis of dendritic polyolefins by metathesis insertion polymerization 


39. 8,481,796 
Olefin oligomerization and compositions therefrom 

38. 8,481,658 
Method for transitioning between incompatible olefin polymerization catalyst systems 


37. 8,476,384 
Olefin acrylate emulsion copolymerization 

36. 8,476,383 
Process for producing polyolefins 

35. 8,476,181 
Catalyst systems for the oligomerization of olefin monomers 


34. 8,471,050 
Organometallic transition metal compound, catalyst system and preparation of polyolefins1. 8,470,940 
Complexes and method for synthesis of group 4 organometallics grafted on anions olefin oligomerization and polymerization method 


33. 8,461,365 
Metallocene complex and polymerization method of olefin 


32.  8,455,386 
Polyolefins prepared from a metallocene and a new single site catalyst components in a single reactor


31. 8,445,609 
Method for producing olefin polymer


30. 8,440,772 
Methods for terminating olefin polymerizations 


29. 8,436,112 
Polyolefin production with a high performance support for a metallocene catalyst system 

28. 8,436,111 
Nickel catalyst system for the preparation of high CIS polybutadiene 

27. 8,436,110 
Olefin metathesis process employing bimetallic ruthenium complex with bridging hydrido ligands 

26. 8,435,911 
Hybrid catalyst composition for polymerization of olefins 


25. 8,431,663 
Polymer and method for producing same

24. 8,431,660 
Non-metallocene catalysts having tetrazol group for olefin polymerization and polymerizing method of olefin using the same 

23. 8,431,659 
Prepolymerized catalyst for olefin polymerization, method of producing this prepolymerized catalyst and method of producing olefin polymer 


22. 8,426,538 
Catalyst compositions and polyolefins for extrusion coating applications 

21. 8,426,537 
Solid catalyst component and catalyst for polymerization of olefins, and process for production of olefin polymers using same 


20. 8,420,755 
Compounds, catalyst composition comprising the same, and method for preparing of cycloolefin-based polymer using the same  

19. 8,420,563 
Catalyst complex and process for producing multimodal molecular weight polyolefins 

18. 8,420,562 
Process for the preparation of an unsupported, solid metallocene catalyst system and its use in polymerization of olefins 


17. 8,415,492 
Metallocene compounds, catalysts comprising them, process for producing an olefin polymer by use of the catalysts, and olefin homo- and copolymers 

16. 8,415,441 
Methods of constructing polyolefins having reduced crystallinity using a diimine based catalyst 

15. 8,415,434 
Catalytic olefin block copolymers via polymerizable shuttling agent 


14. 8,410,231 
Production process of olefin polymer 


13. 8,404,792 
Cyclobutene polymers and methods of making the same 

12. 8,404,789 
Olefin polymerization catalyst and preparation method and use thereof 

11. 8,404,612 
Catalyst compositions and methods of making and using the same 


10. 8,394,908 
Methods of constructing alkene-based homopolymer polyolefins having reduced crystallinity 

9. 8,394,902 
Pyridyldiamido transition metal complexes, production and use thereof 

8. 8,394,733 
Process for the preparation of an unsupported, solid olefin polymerisation catalyst and use in polymerisation of olefins 


7. 8,383,869 
Olefin oligomer composition 

6. 8,383,848 
Transition metal compound and catalyst for olefin polymerization 

5. 8,383,754 
Catalyst compositions for producing high Mz/Mw polyolefins 


4. 8,362,184 
Butene/.alpha.-olefin block interpolymers 


3. 8,349,984 
Polyolefin solution polymerization process and polymer 

2. 8,349,977 
Process for preparing high-reactivity isobutene homo- or copolymers 

1. 8,349,975 
Method for the production of polymers 


Patent Abstracts

8,217,125  (7/10/2012)
Process to reduce polyolefins with extra low impurity content
Karbasi et al of Borealis Technology Oy, Finland, developed a process for producing polyolefins, which includes polymerizing at least one olefin monomer, separating at least a part of the reaction mixture, dividing the separated reaction mixture into a polymer-lean fraction and a polymer-rich fraction, and subjecting at least a part of the polymer-lean fraction to a purification step prior to recycling back to the polymerization of at least one olefin monomer. The obtained polyolefins particularly have a low content of volatile low molecular weight compounds, a low content of low-molecular weight polyolefin waxes and a low content of residues derived from the catalyst employed. (RDC 7/30/2012)



“Generally, polyolefins contain impurities as a result of the polymerization process. Typical impurities include residues from the catalyst employed during the polymerization, including the cocatalyst(s) and scavenger(s), oligomers, by-products and various volatile low molecular weight compounds. Depending on the application, the impurities may have a negative effect even if they are contained in the polymer only in low concentrations. For example, polymers used for water pipes should not contain low molecular weight volatile compounds since these compounds might migrate from the polymer into the transported water and cause taste or odor problems. Further, polymers used for making films to be used in electric devices, such as insulation films in capacitors, should not contain metal impurities in order to avoid an electrical breakthrough through the film. Finally, polymers used in automotive applications, in particular polypropylene used for the manufacture interior parts of an automobile, need to satisfy high standards with respect to volatile compounds contained in the polymer. High amounts of hydrocarbons contained in a polymer employed for preparing such interior parts may lead to fogging problems, in particular when such hydrocarbons, typically hydrocarbons having from 16 to 32 carbon atoms, evaporate from the interior parts and condense on the car windows. At the same time, the appearance of the interior parts is deteriorated.

The recent process developments focus on improved process economy, including increased recycling of raw materials and simple process steps to separate undesired hydrocarbons components from the polymer.

It has been proposed to recover the polymer from the reactor by use of a separating device, such as a hydrocyclone. The hydrocyclone separates a part of the fluid phase from the obtained polymer, thereby producing a concentrated slurry. The separated fluid phase is directly recycled back into the polymerization reactor. While this is advantageous in terms of process economy, disadvantageously, any impurities contained in the fluid are also recycled back to the polymerization zone. This results in an accumulation of these impurities in the reaction mixture over time, and thereby the amount of impurities contained in the obtained polymer will increase. In turn, additional purification steps of the polymer become necessary, which is counterproductive for the overall process economy.”

 [Karbasi et al, US Patent 8,217,125 (7/10/2012)]


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(RDC 7/16/2012)


Roger D. Corneliussen

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921


Copyright 2013 by Roger D. Corneliussen.
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