Nanoporous polymeric foam having high porosity
US9718938B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2010 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Jan 18, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2201/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Prepare a polymeric foam article having a thermoplastic polymer matrix defining multiple cells therein, wherein the polymeric foam article has the following characteristics: (a) the thermoplastic polymer matrix contains dispersed within it nano-sized nucleating additive particles that have at least two orthogonal dimensions that are less than 30 nanometers in length; (b) possesses at least one of the following two characteristics: (i) has an effective nucleation site density of at least 3×1014 sites per cubic centimeter of pre-foamed material; and (ii) has an average cell size of 300 nanometers or less; and (c) has a porosity percentage of more than 50 percent by rapidly expanding at a foaming temperature a foamable polymer composition containing the nucleating additive and a blowing agent containing at least one of carbon dioxide, nitrogen and argon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.