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AssigneeChevron Phillips Chemical Company LP
InventorsYoulu Yu, Eric D. Schwerdtfeger, Jeffrey S. Fodor, David A. Soules
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A bimodal polymer composition comprising a lower molecular weight homopolymer and a higher molecular weight copolymer wherein the bimodal polymer composition has a density of from about 0.930 gram per cubic centimeter (g/cc) to about 0.970 g/cc, a ratio of high load melt index:melt index of from about 10 to about 150 and an Environmental Stress Crack Resistance (ESCR) of from about 25 hours to about 300 hours when measured in accordance with ASTM D1693 or ASTM D2561. A chromium-catalyzed polymer composition comprising (i) a lower molecular weight homopolymer and (ii) a higher molecular weight copolymer, wherein the bimodal polymer composition has an Environmental Stress Crack Resistance (ESCR) of from about 25 hours to about 300 hours when measured in accordance with ASTM D1693 or ASTM D2561.
A chromium-catalyzed bimodal polymer composition comprising a lower molecular weight homopolymer and a higher molecular weight copolymer wherein the bimodal polymer composition has a density of from about 0.930 gram per cubic centimeter (g/cc) to about 0.970 g/cc, an Environmental Stress Crack Resistance (ESCR-A) value of from about 25 hours to about 4500 hours as measured in accordance with ASTM D1693, and a primary structure parameter (PSP2) of from about 6.0 to about 13.
A chromium-catalyzed polymer composition comprising (i) a lower molecular weight homopolymer and (ii) a higher molecular weight copolymer, wherein the polymer composition has an Environmental Stress Crack Resistance (ESCR) of from about 25 hours to about 300 hours when ESCR-A, ESCR-B and bottle ESCR are measured in accordance with ASTM D1693 or ASTM D2561 and a weight swell of from about 0 to less than about 700;
Dependencies are inferred from the claim text.