Bimodal neodymium-catalyzed polybutadiene
US-9284385-B2 · Mar 15, 2016 · US
Aged lanthanide-based catalyst systems and their use in the preparation of cis-1,4-polydienes
US12371516B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12371516-B2 |
| Application number | US-202318108778-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 13, 2023 |
| Priority date | Jan 28, 2015 |
| Publication date | Jul 29, 2025 |
| Grant date | Jul 29, 2025 |
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Abstract
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A method for preparing cis-1,4-polydienes, the method comprising the steps of preparing a preformed, active lanthanide-based catalyst, aging the active lanthanide-based catalyst for more than 5 days to thereby formed an aged catalyst, and introducing the aged catalyst and conjugated diene monomer to be polymerized to thereby form an active polymerization mixture in which the conjugated diene monomer is polymerized to form a polydiene having a reactive chain end.
First claim
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What is claimed is: 1. A method for preparing a functionalized polymer, the method comprising: (a) preparing a catalyst composition by combining a lanthanide-containing compound, an alkylating agent, and a halogen source; (b) aging the catalyst composition to form an aged catalyst composition, where said step of aging includes aging for from 12 days to 15 days, where said step of aging the catalyst composition consists only of aging the catalyst composition prior to combining th…
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Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
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- What does patent US12371516B2 cover?
- A method for preparing cis-1,4-polydienes, the method comprising the steps of preparing a preformed, active lanthanide-based catalyst, aging the active lanthanide-based catalyst for more than 5 days to thereby formed an aged catalyst, and introducing the aged catalyst and conjugated diene monomer to be polymerized to thereby form an active polymerization mixture in which the conjugated diene mo…
- Who is the assignee on this patent?
- Bridgestone Corp
- What technology area does this patent fall under?
- Primary CPC classification C08F136/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 29 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).