Sunder R Balakrishnan

US Patent:

7553919, Jun 30, 2009

Filed:

May 6, 2005

Appl. No.:

11/124491

Inventors:

Ramani Narayan - Okemos MI, US
Sunder Balakrishnan - Okemos MI, US
Boo-Young Shin - Kyoungsan, KR

Assignee:

Board of Trustees of Michigan State University - East Lansing MI

International Classification:

C08F 251/00
C08L 3/00
C08L 89/00
D21H 19/54
C08B 31/12
A61K 9/28

US Classification:

527300, 524 47, 524 50, 524 51

Abstract:

A new starch-vegetable oil graft copolymer, wherein the vegetable oil has been reacted onto the starch backbone using thermal or free radical initiators has been produced in a twin-screw co-rotating extruder. The starch-vegetable oil graft copolymer can further be reinforced with biofiber in the presence of an optional modifier such as maleic anhydride by reactive extrusion processing to form composites suitable to be injection molded into biodegradable articles.

US Patent:

7629405, Dec 8, 2009

Filed:

Nov 19, 2004

Appl. No.:

10/993186

Inventors:

Ramani Narayan - Okemos MI, US
Sunder Balakrishnan - Okemos MI, US
Yogaraj Nabar - East Lansing MI, US
Jean-Marie Raquez - East Lansing MI, US
Philippe Dubois - Ciplet Belgium, BE

Assignee:

Board of Trustees of Michigan State University - East Lansing MI

International Classification:

C08L 3/02
C08L 3/00
C08L 3/12
C08B 31/02

US Classification:

524445, 523128, 524 18, 524 47, 524386, 524387, 524447, 524449, 525 5424, 527300, 527305, 527315

Abstract:

A starch-polyester graft copolymer and chemically modified starch-polyester graft copolymer composition comprising a chemically modified starch or chemically modified starch-nanoclay product is described. The composition can be produced continuously in a twin-screw co-rotating extruder. The starch-polyester graft copolymer can be solvent cast, melt cast and blown into clear transparent film particularly for use in single use disposable applications and can be biodegradable.

US Patent:

7985794, Jul 26, 2011

Filed:

Dec 7, 2009

Appl. No.:

12/592996

Inventors:

Ramani Narayan - Okemos MI, US
Sunder Balakrishnan - Okemos MI, US
Yogaraj Nabar - East Lansing MI, US
Jean-Marie Raquez - East Lansing MI, US
Philippe Dubois - Ciplet, BE

Assignee:

Board of Trustees of Michigan State University - East Lansing MI

International Classification:

C08B 31/02
C08L 3/00
C08L 3/02
C08L 3/12

US Classification:

524445, 523128, 524 18, 524 47, 524386, 524387, 524447, 524449, 525 5424, 527300, 527305, 527315

Abstract:

A starch-polyester graft copolymer and chemically modified starch-polyester graft copolymer composition comprising a chemically modified starch or chemically modified starch-nanoclay product is described. The composition can be produced continuously in a twin-screw co-rotating extruder. The starch-polyester graft copolymer can be solvent cast, melt cast and blown into clear transparent film particularly for use in single use disposable applications and can be biodegradable.

US Patent:

7361727, Apr 22, 2008

Filed:

Aug 8, 2005

Appl. No.:

11/199536

Inventors:

Ramani Narayan - Okemos MI, US
Jean-Marie Raquez - Mons, BE
Sunder Balakrishnan - East Lansing MI, US
Philippe Dubois - Ciplet, BE
Philippe Degee - Hautrage, BE

Assignee:

Board of Trustees of Michigan State University - East Lansing MI

International Classification:

C08G 63/78

US Classification:

528274, 521182, 521916, 524306, 524310, 525306, 525310, 525437, 528182, 528188, 528354, 549274, 549349

Abstract:

A polymerization process to derive a thermal-stabilized poly(1,4-dioxan-2-one) and cyclic ester monomer copolymer using a coordination-insertion catalyst/initiator. 1,4-dioxan-2-one and cyclic ester monomer, each containing less than 100-ppm water and having an acid value less than 0. 5 mg KOH/g, and preferably less than 0. 2 mg KOH/g, are copolymerized. Preferably the cyclic ester monomer is ε-caprolactone and the reaction is in an extruder.

US Patent:

20060107945, May 25, 2006

Filed:

Nov 19, 2004

Appl. No.:

10/993309

Inventors:

Ramani Narayan - Okemos MI, US
Sunder Balakrishnan - Okemos MI, US
Yogaraj Nabar - East Lansing MI, US
Boo-Young Shin - Korea, KR
Philippe Dubois - Ciplet Belgium, BE
Jean-Marie Raquez - East Lansing MI, US

Assignee:

Board of Trustees of Michigan State University - East Lansing MI

International Classification:

C08B 30/12
C09J 103/06

US Classification:

127032000, 106207100

Abstract:

A chemically modified plasticized starch (CMPS) is prepared by reacting starch with an organic dibasic acid or an anhydride of the acid in the presence of a plasticizer using optional free radical initiators, and optionally with the incorporation of nano clays in the reactive extrusion process. The starch is thermoplastic and has a lower viscosity than the traditional thermoplastic starch. The CMPS is useful in preparing starch polymer compositions which are at least partially biodegradable.