Polycondensation pre-polyesters, other copolyester precursors, and copolyesters made therefrom
US12391794B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | Jun 26, 2020 |
| Grant date | Aug 19, 2025 |
| Priority date | — |
| Expiry date | Oct 30, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A pentamer comprising the following: R and R″ are residues of at least one diol selected from 2,2,4,4-tetramethylcyclobutane-1,3-diol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, hydroxypivalyl hydroxypivalate, isosorbide, 1,4-di-(hydroxyethoxy)-benzene, 2,2-bis-(4-hydroxycyclohexyl)-propane, 2,4-dihydroxy-1,1,3,3-tetramethyl-cyclobutane, 2,2-bis-(3-hydroxyethoxyphenyl)-propane, or 2,2-bis-(4-hydroxypropoxyphenyl)-propane; and R and R″ are not the same; and R′ comprises residues of at least one diacid or diester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.