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Home   •   Spotlight  •  pcite00  •  Most Cited Patent Families 2000-Chemistry and Related (5)

Most Cited Patent Families 2000-Chemistry and Related

Following is a CAS database record representing a highly cited patent family.

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CAS indexed 92 chemical substances from this document. CAS subject entries for this document include: Coordination compounds; Polymerization catalysts; Aluminoxanes.

CAPLUS COPYRIGHT 2001 ACS

TITLE:	Constrained geometry addition polymerization catalysts, processes for their preparation, precursors therefor, methods of use, and novel polymers formed therewith
INVENTOR(S):	Stevens, James C.; Timmers, Francis J.; Wilson, David R.; Schmidt, Gregory F.; Nickias, Peter N.; Rosen, Robert K.; Knight, George W.; Lai, Shih Yaw
PATENT ASSIGNEE(S):	Dow Chemical Co., USA
SOURCE:	Eur. Pat. Appl., 58 pp. CODEN: EPXXDW
LANGUAGE:	English

PATENT INFORMATION:

PATENT NO.       KIND  DATE           APPLICATION NO.  DATE
---------------  ----  --------       ---------------  --------
EP 416815         A2   19910313       EP 1990-309496   19900830
EP 416815         A3   19920311EP 416815         B1   19970813
    R:  AT, BE, DE, ES, FR, GB, IT, NL, SE
CA 2024333        AA   19910301       CA 1990-2024333  19900830
NO 9003797        A    19910301       NO 1990-3797     19900830
NO 176964         B    19950320NO 176964         C    19950628
AU 9062039        A1   19910307       AU 1990-62039    19900830
AU 645519         B2   19940120
HU 59423          A2   19920528       HU 1990-5704     19900830
HU 209316         B    19940428
PL 166689         B1   19950630       PL 1990-286684   19900830
RU 2073018        C1   19970210       RU 1990-4831104  19900830
EP 764653         A2   19970326       EP 1996-119258   19900830
EP 764653         A3   19980211    R:  AT, BE, DE, ES, FR, GB, IT, NL, SE
EP 764664         A2   19970326       EP 1996-119354   19900830
EP 764664         A3   19980211    R:  AT, BE, DE, ES, FR, GB, IT, NL, SE
EP 764654         A2   19970326       EP 1996-119394   19900830
EP 764654         A3   19980211    R:  AT, BE, DE, ES, FR, GB, IT, NL, SE
EP 765888         A2   19970402       EP 1996-119603   19900830
EP 765888         A3   19980211    R:  AT, BE, DE, ES, FR, GB, IT, NL, SE
EP 774468         A2   19970521       EP 1996-119530   19900830
EP 774468         A3   19980211    R:  AT, BE, DE, ES, FR, GB, IT, NL, SE
AT 156827         E    19970815       AT 1990-309496   19900830
ES 2106020        T3   19971101       ES 1990-309496   19900830
CN 1049849        A    19910313       CN 1990-107395   19900831
CN 1029850        B    19950927
JP 03163088       A2   19910715       JP 1990-228538   19900831
JP 2535249        B2   19960918
BR 9004460        A    19910910       BR 1990-4460     19900831
ZA 9006969        A    19920527       ZA 1990-6969     19900831
NO 9303289        A    19910301       NO 1993-3289     19930915
NO 179043         B    19960415NO 179043         C    19960724
NO 9303290        A    19910301       NO 1993-3290     19930915
JP 07053618       A2   19950228       JP 1994-79125    19940314
JP 07070223       A2   19950314       JP 1994-79126    19940314
NO 9504469        A    19910301       NO 1995-4469     19951107
US 6075077        A    20000613       US 1997-958361   19971027
CZ 287632         B6   20010117       CZ 1999-2974     19990820

ABSTRACT:
Title catalysts are prepd. having structures I [M = metal; Cp = (substituted) cyclopentadienyl group bound in an .eta.5 bonded mode to M; Z = groups contg. B, S, O, etc., optionally Cp and Z together form a fused ring system; X = anionic or neutral Lewis base ligands having .ltoreq.30 non-H atoms; n = 0-4; Y = anionic or nonanionic ligands bonded to Z and M comprising N, P, O or S and having .ltoreq.20 non-H atoms, and optionally Y and Z together form a fused ring system. Addn. polymn. of, esp. ethylene with comonomers, using the metal complexes activated by cocatalysts gives highly elastic copolymers. Thus, 0.443 g ZrCl4 in 8 mL Et2O and 15 mL THF was slowly added with 0.500 g dilithium (tert-butylamido)dimethyl(tetramethylcyclopentadienyl)silane in 15 mL THF, and stirred for several days to give a (tert-butylamido)dimethyl(tetramethyl-.eta.5-cyclopentadienyl)silane zirconium dichloride which was used with Me aluminoxane cocatalyst in polymn. of C2H4 with 4-methyl-1-pentene or with hexene-1.

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