Renewable polyester fibers having a low density
US12139822B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Dec 4, 2020 |
| Grant date | Nov 12, 2024 |
| Priority date | — |
| Expiry date | Oct 7, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/608
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Fibers that are formed from a thermoplastic composition that contains a rigid renewable polyester and has a voided structure and low density are provided. To achieve such a structure, the renewable polyester is blended with a polymeric toughening additive in which the toughening additive can be dispersed as discrete physical domains within a continuous matrix of the renewable polyester. Fibers are thereafter formed and then stretched or drawn at a temperature below the glass transition temperature of the polyester (i.e., “cold drawn”).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.