Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2006-01-03
2006-01-03
Rabago, Roberto (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S118000, C526S119000, C526S126000, C526S129000, C526S348000
Reexamination Certificate
active
06982304
ABSTRACT:
Polyethylene resins having improved environmental stress crack resistance, stiffness and impact resistance is made by a process comprising feeding both a chromium oxide catalyst and a silyl chromium catalyst into a polymerization reactor. The chromium oxide catalyst and the silyl chromium catalyst are on separate supports. The chromium oxide catalyst is 25–50 weight percent and the silyl chromium catalyst is 50–75 weight percent of the total weight of catalyst. The catalysts may be added separately or as a single mixture.
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Breetz Karen
Jaker Stephen Paul
Jorgensen Robert J.
Mure Cliff Robert
St. Jean Guylaine
Rabago Roberto
Union Carbide Chemicals & Plastics Technology Corporation
Whyte Hirschboeck Dudel SC
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