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Expandable polystyrene resin particles, method for production thereof, and molded foam product
US8961859B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8961859-B2 |
| Application number | US-86517309-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 23, 2009 |
| Priority date | Jan 30, 2008 |
| Publication date | Feb 24, 2015 |
| Grant date | Feb 24, 2015 |
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Abstract
Official abstract text for this publication.
There are provided expandable polystyrene resin particles formed by granulating a polystyrene resin containing an expanding agent, wherein the weight-average molecular weight Mw of the polystyrene resin is in the range of 120,000 to 270,000, and the expanding agent contains, as an essential component, pentane at a proportion of 3 to 8 parts by mass based on 100 parts by mass of the polystyrene resin, while the composition of the pentane is in the range of isopentane:normal pentane=10:90 to 80:20 by mass ratio. These expandable polystyrene resin particles can utilize a recycled raw material, and can produce a molded foam product having sufficient mechanical strength, while the expandable polystyrene resin particles have a long bead life and excellent low pressure moldability.
First claim
Opening claim text (preview).
The invention claimed is: 1. Expandable polystyrene resin particles obtained by a melt extrusion method for obtaining expandable polystyrene resin particles by injecting and kneading an expanding agent into a molten polystyrene resin in an extruder, extruding the molten resin containing the expanding agent directly into a liquid for cooling through an orifice of a die installed at the front end of the extruder, and cutting the extrusion product with a rapidly rotating blade simulta…
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Classifications
Operations & Transport · mapped topic
- B29B9/065Primary
Operations & Transport · mapped topic
Operations & Transport · mapped topic
Chemistry & Metallurgy · mapped topic
Operations & Transport · mapped topic
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- What does patent US8961859B2 cover?
- There are provided expandable polystyrene resin particles formed by granulating a polystyrene resin containing an expanding agent, wherein the weight-average molecular weight Mw of the polystyrene resin is in the range of 120,000 to 270,000, and the expanding agent contains, as an essential component, pentane at a proportion of 3 to 8 parts by mass based on 100 parts by mass of the polystyrene …
- Who is the assignee on this patent?
- Chinomi Ryosuke, Tarumoto Hiroyuki, Saitou Yoshifumi, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification B29B9/065. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Feb 24 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).