Recovery of monomer from polyurethane materials by depolymerization
US-9815808-B2 · Nov 14, 2017 · US
Recovery of monomer from polyurethane materials by depolymerization
US10160741B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10160741-B2 |
| Application number | US-201715728878-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 10, 2017 |
| Priority date | Feb 29, 2016 |
| Publication date | Dec 25, 2018 |
| Grant date | Dec 25, 2018 |
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Abstract
Official abstract text for this publication.
Methods for recovering monomers from polymers, such as polyurethanes (including thermoset polyurethanes) include heating the polymer to depolymerize the polymer and release the monomer. The monomer may be directly recovered. The polymer may include a poly(β-methyl-δ-valerolactone) (PMVL) block and the monomer recovered may be β-methyl-δ-valerolactone (MVL).
First claim
Opening claim text (preview).
What is claimed is: 1. A method for recovering a lactone monomer from a polymer comprising polyester derived from lactone monomer, wherein the lactone has a bulk ceiling temperature of 600° C. or less, the method comprising: heating the polymer to cause depolymerization and release of the lactone monomer from the polyester; and recovering the released lactone monomer, wherein the polyester has a glass transition temperature of 20° C. or less. 2. A method according to claim 1 , wherein the lactone monomer is selected from the group consisting of an alkyl-substituted δ-lactone and ε-caprolactone and a γ-lactone monomer. 3. A method according to claim 1 , wherein the lactone monomer is selected from the group consisting of δ-decalactone, α-methyl-δ-valerolactone, and γ-methyl-δ-valerolactone. 4. A method according to claim 1 , wherein the polymer is a thermoset polyurethane. 5. A method according to claim 1 , wherein the polymer is a block copolymer comprising a polyester block. 6. A method for recovering a monomer from a polymer comprising homopolymer block, wherein the homopolymer block has a bulk ceiling temperature of 600° C. or less, the method comprising: heating the polymer to cause depolymerization and release of the monomer; and recovering the released monomer. 7. A method according to claim 6 , wherein the homopolymer block has a glass transition temperature of 20° C. or less.
Assignees
Inventors
Classifications
containing polyester or polycarbonate sequences · CPC title
- C07D309/30Primary
Oxygen atoms, e.g. delta-lactones · CPC title
prepared using water as the sole blowing agent · CPC title
flexible · CPC title
having alkylene polyamine groups · CPC title
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Frequently asked questions
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- What does patent US10160741B2 cover?
- Methods for recovering monomers from polymers, such as polyurethanes (including thermoset polyurethanes) include heating the polymer to depolymerize the polymer and release the monomer. The monomer may be directly recovered. The polymer may include a poly(β-methyl-δ-valerolactone) (PMVL) block and the monomer recovered may be β-methyl-δ-valerolactone (MVL).
- Who is the assignee on this patent?
- Univ Minnesota
- What technology area does this patent fall under?
- Primary CPC classification C07D309/30. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 25 2018 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).