Joseph D Webster

US Patent:

42514070, Feb 17, 1981

Filed:

Sep 1, 1978

Appl. No.:

5/939164

Inventors:

Carl W. Schroeder - Houston TX
Joseph R. Webster - Houston TX

Assignee:

Shell Oil Company - Houston TX

International Classification:

C08K 322

US Classification:

260 23R

Abstract:

Polypropylene which contains residues of Ziegler catalysts, and especially crystalline polypropylene which contains significant amounts of low molecular weight or atactic polymer, is improved by addition of a very low concentration of finely divided zinc oxide. Such zinc oxide not only acts as acid acceptor, making it possible to omit the conventional calcium stearate acid acceptor, but also interferes with migration of atactic and low molecular weight polymer to the surface, thus preventing plate-out of such material on processing equipment. In the thermal processing of polyproplene compositions containing metal stearate as acid acceptor or organic stearates as antistatic additives, the presence of such zinc oxide in the composition prevents plate-out on processing equipment and improves corrosivity of the compositions; it does not eliminate the antistatic effect.

US Patent:

43871852, Jun 7, 1983

Filed:

Jun 24, 1982

Appl. No.:

6/391736

Inventors:

Carl W. Schroeder - Houston TX
Joseph R. Webster - Houston TX

Assignee:

Shell Oil Company - Houston TX

International Classification:

C08L 2316
C08L 2326
C08L 3104

US Classification:

525194

Abstract:

A new composition for the heat-sealable layer in a retort-sterilizable pouch is disclosed. The new composition is the cracked product of the blend of a poly(propylene-ethylene) copolymer and an ethylene-vinyl acetate copolymer. This composition has improved flow properties and may be extrusion-coated onto a metal film substrate at high speeds.

US Patent:

43594956, Nov 16, 1982

Filed:

Feb 25, 1981

Appl. No.:

6/237830

Inventors:

Carl W. Schroeder - Houston TX
Joseph R. Webster - Houston TX

Assignee:

Shell Oil Company - Houston TX

International Classification:

B32B 102
B32B 1508
B65D 3700

US Classification:

428 35

Abstract:

In a retort-sterilizable laminated structure comprising an aluminum foil or sheet, a heat-sealable polymer layer, and a heat-resistant resin layer, the heat-sealable layer is the cracked product of the blend of a poly(propylene-ethylene) copolymer and an ethylene-vinyl acetate copolymer. This heat-sealable layer composition has improved flow properties and may be extrusion-coated onto a metal film substrate at high speeds.