MULTI-HEADED CHAIN SHUTTLING AGENTS AND THEIR USE FOR THE PREPARATION OF BLOCK COPOLYMERS
申请人:Dow Global Technologies Llc
公开号:EP3243846A2
公开(公告)日:2017-11-15
This disclosure relates to olefin polymerization catalysts and compositions, their manufacture, and the production of polyolefins using specific catalyst compositions, including the use of chain-shuttling agents in the olefin polymerization process. Specifically, this disclosure provides for dual-headed and multi-headed chain shuttling agents (CSAs or MSAs) and for their use in preparing blocky copolymers. By controlling the ratio of dual-headed and multi-headed CSA sites to mono-headed CSA sites, a blocky copolymer can be provided having properties such as a narrow molecular weight distribution and/or improved melt properties.
CHAIN SHUTTLING AGENTS AND THEIR USE FOR THE PREPARATION OF BLOCK COPOLYMERS
申请人:Dow Global Technologies Llc
公开号:EP3489264A1
公开(公告)日:2019-05-29
The present disclosure relates to olefin polymerization catalysts and compositions, their manufacture and the production of polyolefins using specific catalyst compositions, including the use of chain-shuttling agents in the olefin polymerization process. Specifically, the present disclosure provides for dual-headed and multi-headed chain shuttling agents and their use in preparing block copolymers. By controlling the ratio of dual-headed and multi-headed chain shuttling agent sites to mono-headed chain shuttling agent sites, a block copolymer can be provided having properties such as narrow molecular weight distribution and/or improved melt properties.
Multi- or dual-headed compositions useful for chain shuttling and process to prepare the same
申请人:Dow Global Technologies LLC
公开号:US11359035B2
公开(公告)日:2022-06-14
The present disclosure relates to a process for synthesizing a multi- or dual-headed composition by using an alpha,omega-diene and an organometallic compound in the presence of a catalyst precursor. The present disclosure further relates to use of the compositions, as well as the process to make the same, in olefin polymerization.
Capped multi- or dual-headed compositions useful for chain shuttling and process to prepare the same
申请人:Dow Global Technologies LLC
公开号:US11359038B2
公开(公告)日:2022-06-14
The present disclosure relates to a capped, multi- or dual-headed chain composition comprising derivatives of a strained olefin. The present disclosure further relates to a process for synthesizing the capped, multi- or dual-headed composition by using an organometallic compound and a co-catalyst in the presence of a catalyst precursor and a strained olefin. The present disclosure further relates to use of the compositions, as well as the process to make the same, in olefin polymerization.