Hee Sook Yoo from Wilmington, DE, age 61

License #:

2705060213 - Expired

Category:

Contractor

Issued Date:

Jan 16, 2001

Expiration Date:

Jan 31, 2003

Type:

Class C

Propylene Melt Blown Resins, Propylene Melt Blown Resin Fibers And Non-Woven Fabric Made From The Same, And Methods Of Making The Same
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US Patent:

20090017710, Jan 15, 2009
Filed:

Feb 2, 2007
Appl. No.:

12/223414
Inventors:

Daniele Bugada - Newark DE, US
Hee Ju Yoo - Wilmington DE, US
Assignee:

Basell Polyolefine GmbH - Wesseling
International Classification:

C08F 4/642
C08F 110/06
D04H 5/00
US Classification:

442327, 526351, 526159
Abstract:

A polypropylene homopolymer melt blown resin comprising a melt flow rate of about 300 to about 2500 g/10 min. at 230 C., a polydispersion index of about 1.3 to about 2.9, and a melting point of at least 160 C.

Radiation Visbroken Polypropylene And Fibers Made Therefrom
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US Patent:

58209816, Oct 13, 1998
Filed:

Apr 2, 1996
Appl. No.:

8/626412
Inventors:

Stephen D. Williams - Newark DE
Hee Ju Yoo - Wilmington DE
Miriam R. Drickman - Boulder CO
Assignee:

Montell North America Inc. - Wilmington DE
International Classification:

D02G 300
C08F11006
C08F21002
C08F21006
US Classification:

428364
Abstract:

A propylene homopolymer having a stick-point of 30 cm or less during melt spinning, an oligomer content of less than 1500 ppm without postpolymerization treatment to remove oligomers, and a melt flow rate greater than 300 dg/min is prepared by radiation visbreaking in a multistage fluidized bed reactor. The polymer is subjected to irradiation in the substantial absence of oxygen, followed by a multistage treatment in the presence of a controlled amount of oxygen. The radiation visbreaking process can also be applied to other propylene polymer materials. The propylene polymer materials produced by this radiation visbreaking process can be used, for example, for extrusion coating, film production, and injection molding.

Radiation Visbroken Polypropylene And Fibers Made Therefrom
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US Patent:

58043047, Sep 8, 1998
Filed:

Aug 8, 1997
Appl. No.:

8/908761
Inventors:

Stephen D. Williams - Newark DE
Hee Ju Yoo - Wilmington DE
Assignee:

Montell North America Inc. - Wilmington DE
International Classification:

D02G 300
C08F 600
US Classification:

428364
Abstract:

A propylene homopolymer having a stick-point of 30 cm or less during melt spinning, an oligomer content of less than 1500 ppm without postpolymerization treatment to remove oligomers, and a melt flow rate greater than 300 dg/min is prepared by radiation visbreaking in a multistage fluidized bed reactor. The polymer is subjected to irradiation in the substantial absence of oxygen, followed by a multistage treatment in the presence of a controlled amount of oxygen. The radiation visbreaking process can also be applied to other propylene polymer materials. The propylene polymer materials produced by this radiation visbreaking process can be used, for example, for extrusion coating, film production, and injection molding.