Accession Number:

ADA235846

Title:

Complexation of Cp2MCl2 in a Chloroaluminate Molten Salt: Relevance to Homogeneous Ziegler-Natta Catalysis

Descriptive Note:

Corporate Author:

FRANK J SEILER RESEARCH LAB UNITED STATES AIR FORCE ACADEMY CO

Personal Author(s):

• Carlin, Richard T.
• Wilkes, John S.

Report Date:

1990-01-01

Pagination or Media Count:

10.0

Abstract:

Ethylene polymerization via Ziegler-Natta catalysis occurs in the ambient-temperature molten slat AlCl3-MEIC employing Cp2TiCl2 as the catalyst occurs only in melts with AlCl3MEIC molar ratios. Cp2ZrCl2 and Cp2HfCl2 with AlCl3-XrX cocatalysts are not catalytically active in acidic melts. 1H NMR studies indicate formation of a strong 11 complex between Cp2TiCl2 and AlCl3, while Zr and Hf form much weaker 11 complexes due to strong Zr - Cl and Hf - Cl bonding. This stronger M - Cl bonding for Zr and Hf is proposed to preclude the initiation reaction for ethylene polymerization n the molten salt.

Descriptors:

• *SALTS
• POLYMERIZATION
• MELTS
• ACIDS
• CATALYSIS
• REPRINTS
• ETHYLENE

Subject Categories:

• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE