High recycle content polyols from thermoplastic polyesters and lignin or tannin
US9751978B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2016 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Sep 15, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyester polyols, processes for making them, and applications for the polyols are disclosed. In some aspects, the polyols comprise recurring units from a thermoplastic polyester or an aromatic polyacid source, a glycol, and a lignin, tannin, or mixture thereof. Optionally, the polyols incorporate recurring units of a hydrophobe. The polyols are made in one or multiple steps; in some aspects, the thermoplastic polyester or aromatic polyacid source and the glycol are reacted first, followed by reaction with the lignin, tannin, or mixture thereof. High-recycle-content polyols having desirable properties and attributes for formulating polyurethane products, including two-component polyurethane coatings, can be made. The polyols provide a sustainable alternative to bio- or petrochemical-based polyols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.