Varun C Ratta

US Patent:

20060057410, Mar 16, 2006

Filed:

Aug 14, 2003

Appl. No.:

10/527142

Inventors:

Jose Saavedra - Lake Jackson TX, US
Rajen Patel - Lake Jackson TX, US
Varun Ratta - Pearland TX, US

International Classification:

B32B 27/08
B29C 47/00
B32B 27/32

US Classification:

428515000, 428516000, 156244110, 156244240

Abstract:

A multi-layer heat film having at least three layers is disclosed wherein the film has high optical properties, high stiffness and desirable shrinkage in the cross direction. The inner layer, or layers, comprises at least one stiffening polymer selected from the group consisting of: low density polyethylene, linear low density polyethylene, high density polyethylene, blends thereof, polypropylene random copolymer, styrene/butadiene copolymer, polystyrene, ethylene-vinyl acetate copolymer and cyclic-olefin copolymer, provided that when more than one inner layer is present, the inner layers can be the same or different. The skin layers, which may be the same or different, comprise at least one of: low density polyethylene; a blend of low density polyethylene and linear low density polyethylene; a blend of low density polyethylene and very low density polyethylene; polystyrene; ethylene-vinyl acetate copolymer; a blend of ethylene-vinyl acetate copolymer and linear low density polyethylene; cyclic-olefin copolymer; styrene-butadiene copolymer, or, polypropylene random copolymer, provided that the skin layers are devoid of a homogeneously branched polyethylene resin prepared with a single site catalyst. The inventive films have haze values of less than about 15%, a 2% secant modulus greater than about 50,000 psi and a cross directional shrinkage greater than 0%. The inventive films are made by a process that does not include post-extrusion bi-axial orientation.

US Patent:

20080102233, May 1, 2008

Filed:

May 20, 2004

Appl. No.:

10/556583

Inventors:

Staci A. DeKunder - Pearland TX, US
Varun Ratta - Pearland TX, US
James B. Crim - Lake Jackson TX, US

International Classification:

C08F 10/02
C08F 10/00

US Classification:

428 352, 264563, 428218, 4283044

Abstract:

The present invention relates to porous or breathable film compositions and processes for producing such compositions. The porous or breathable films preferably comprise a polyolefin. Said films are useful in many applications including bags for packaging cement.