Vinodkumar S Mehra

US Patent:

54438675, Aug 22, 1995

Filed:

Oct 25, 1993

Appl. No.:

8/142096

Inventors:

Vinodkumar Mehra - Wilmington DE
Edmund A. Flexman - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 502

US Classification:

428 357

Abstract:

Laminar articles are disclosed comprising a heterogeneous melt of (a) a polyolefin, (b) a barrier resin comprising a blend of a condensation polymer incompatible with the polyolefin such as a polyamide and a phenol-formaldehyde resin, and (c) a compatibilizer. A process for making such laminar articles is also disclosed. Multilayer structures incorporating this barrier resin are also disclosed.

US Patent:

57004129, Dec 23, 1997

Filed:

Jan 17, 1996

Appl. No.:

8/587693

Inventors:

Vinodkumar Mehra - Wilmington DE
Robert Benham Fish - Parkersburg WV

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B29B 906
B29C 4706

US Classification:

264143

Abstract:

This invention relates to a process for making laminar articles by blending multicomponent pellets of a heterogeneous blend of a barrier resin, typically a condensation polymer, and a compatibilizer with a polyolefin. The pellets advantageously prevent segregation of the barrier resin and the compatibilizer during processing. This provides uniform, reproducible laminar articles with improved barrier properties and mechanical properties. The articles exhibit good fluid barrier and mechanical properties.

US Patent:

52099580, May 11, 1993

Filed:

Jun 2, 1992

Appl. No.:

7/892306

Inventors:

James D. Katsaros - Beaumont TX
Vinodkumar Mehra - Wilmington DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 102
B32B 2708

US Classification:

428 3691

Abstract:

Multilayer laminates formed from at least two layers. The first layer being a flexible blow moldable thermoplastic polyamide composition and the second layer being a vinyl alcohol composition. These laminates can withstand high temperatures for extended periods of time, possess low temperature impact strength, and have resistance to permeation of fuel compositions. These laminates are especially suited for fuel tanks for motor vehicles.

US Patent:

48268976, May 2, 1989

Filed:

Dec 30, 1986

Appl. No.:

6/947835

Inventors:

Vinodkumar Mehra - Wilmington DE
Pallatheri M. Subramanian - Wilmington DE

Assignee:

E. I. DuPont de Nemours and Company - Wilmington DE

International Classification:

C08L 2706
C08L 2708
C08L 3308
C08L 6700

US Classification:

523455

Abstract:

Polyethylene terephthalate scrap material containing on its surface a chlorine-containing polymer such as, for example, polyvinylidene chloride or polyvinyl chloride, can be recovered and reused by melt-blending it with a polymer from a defined class of ethylene copolymers containing an epoxy group, and melt processing the blend in the same manner as virgin polyethylene terephthalate. The recovered and reprocessed polymer material has good physical properties and barrier properties.

US Patent:

48701106, Sep 26, 1989

Filed:

Jan 26, 1989

Appl. No.:

7/301469

Inventors:

Vinodkumar Mehra - Wilmington DE
Pallatheri M. Subramanian - Wilmington DE

Assignee:

E. I. DuPont de Nemours and Company - Wilmington DE

International Classification:

C08K 310
C08K 325
C08K 509
C08L 6702

US Classification:

521 465

Abstract:

Polyethylene terephthalate scrap material containing on its surface a chlorine-containing polymer such as, for example, polyvinylidene chloride or polyvinyl chloride, can be recovered and reused by melt-blending it with a polymer from a defined class of ethylene copolymers containing an epoxy group, and melt processing the blend in the same manner as virgin polyethylene terephthalate. The recovered and reprocessed polymer material has good physical properties and barrier properties.