Process for Purifying Polycarbonate Polyols and Purifying Apparatus Therefor
US-2017152345-A1 · Jun 1, 2017 · US
Purification process for polyether-carbonate polyols
US12146027B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12146027-B2 |
| Application number | US-202017424259-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 6, 2020 |
| Priority date | Jan 31, 2019 |
| Publication date | Nov 19, 2024 |
| Grant date | Nov 19, 2024 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
Alkylene carbonates are removed from polyether-carbonate polymers by contacting the polyether-carbonate with an absorbent at a temperature of 30 to 150° C. The process is effective and inexpensive. The purified polyether-carbonate is useful for making polyurethanes as well as in many other applications.
First claim
Opening claim text (preview).
What is claimed is: 1. A process for removing an alkylene carbonate from a polyether-carbonate, comprising contacting a starting polyether-carbonate that contains at least 0.25 weight-%, based on the weight of the starting polyether carbonate, of one or more alkylene carbonates, with a solid absorbent that contains pores having an average pore size of at least 1 nm up to 100 nm at a temperature of 30 to 150° C. and at which temperature the starting polyether-carbonate is a liquid, wherein the solid absorbent has a pore volume of 0.25 to 2 mL/g and is selected from the group consisting of an unfunctionalized, crosslinked porous polymer that lacks ion exchange capacity in the form of a particulate solid and a crosslinked porous polymer which which crosslinking porous polymer is is a crosslinked porous anion exchange resin in the form of a particulate solid. 2. The process of claim 1 wherein the starting polyether-carbonate contains 0.5 to 15% by weight of the alkylene carbonate, based on the combined weight of polyether carbonate and alkylene carbonate. 3. The process of claim 1 wherein the alkylene carbonate includes propylene carbonate, ethylene carbonate or both propylene carbonate and ethylene carbonate. 4. The process of claim 1 wherein 40 to 100 weight % of the alkylene carbonate is removed. 5. The process of claim 1 wherein the temperature is 60 to 85° C.
Assignees
Inventors
Classifications
- C08G64/34Primary
and cyclic ethers · CPC title
Post-polymerisation treatment, e.g. recovery, purification, drying · CPC title
and cyclic ethers · CPC title
saturated · CPC title
Cross-linked polymers · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US12146027B2 cover?
- Alkylene carbonates are removed from polyether-carbonate polymers by contacting the polyether-carbonate with an absorbent at a temperature of 30 to 150° C. The process is effective and inexpensive. The purified polyether-carbonate is useful for making polyurethanes as well as in many other applications.
- Who is the assignee on this patent?
- Dow Global Technologies Llc
- What technology area does this patent fall under?
- Primary CPC classification C08G64/34. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 19 2024 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).