Expandable polystyrene composition
US8536240B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2004 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Nov 10, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2491/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An expandable polystyrene composition in the form of expandable beads, comprising by weight (1) 100 parts of a styrene polymer, (2) from 2.2 to less than 4.0 parts of at least one blowing agent, and (3) from 0.01 to 0.4 part of at least one plasticizing. The composition is particularly useful for manufacturing medium density expanded moulded polystyrene objects, particularly with a density from 40 to 190 g/l. A process for manufacturing such objects,is provided, together with pre-expanded beads with a buld density of 40 to 190 g/l, containing by weight (a) 100 parts of a styrene polymer, (b) from 0.5 to less than 3.0 parts of at least one blowing agent, and (c) from 0 to 0.4 part of at least one plasticizing agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.