Polypropylene resin foamed particles, polypropylene resin in-mold foam molded article, and method for producing same
US-9493622-B2 · Nov 15, 2016 · US
Pre-expanded polypropylene resin particles, in-mold foam molded product of polypropylene resin, and method for manufacturing same
US9505857B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9505857-B2 |
| Application number | US-201214005108-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 16, 2012 |
| Priority date | Mar 17, 2011 |
| Publication date | Nov 29, 2016 |
| Grant date | Nov 29, 2016 |
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- Title
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Abstract
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Provided are pre-expanded polypropylene resin particles having a dimensional expansion coefficient of 1.5% or more determined with a thermomechanical analyzer at a constant compressive load of 1 mg during heating from 30° C. to 100° C. at a temperature increase rate of 10° C./min. Using the pre-expanded polypropylene resin particles can yield an in-mold foam molded product of polypropylene resin having few wrinkles and small dimensional shrinkage without pretreatment such as internal pressure application or compression packing during packing the pre-expanded particles in a mold for in-mold foam molding.
First claim
Opening claim text (preview).
The invention claimed is: 1. Pre-expanded polypropylene resin particles comprising a polypropylene resin as a substrate resin, the resin particles having an average particle weight of 3 mg/particle or less, and the pre-expanded particles having a dimensional expansion coefficient of 1.5% or more determined with a thermomechanical analyzer at a constant compressive load of 0.1 g during heating from 30° C. to 100° C. at a temperature increase rate of 10° C./min. 2. An in-mold foam molded product of polypropylene resin obtained by in-mold foam molding of the pre-expanded polypropylene resin particles according to claim 1 , without internal pressure application.
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Classifications
characterized by the use of several polymeric components · CPC title
by impregnating polymer particles with the blowing agent · CPC title
Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons · CPC title
by sintering expandable particles · CPC title
using several expanding {or moulding} steps · CPC title
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- What does patent US9505857B2 cover?
- Provided are pre-expanded polypropylene resin particles having a dimensional expansion coefficient of 1.5% or more determined with a thermomechanical analyzer at a constant compressive load of 1 mg during heating from 30° C. to 100° C. at a temperature increase rate of 10° C./min. Using the pre-expanded polypropylene resin particles can yield an in-mold foam molded product of polypropylene resi…
- Who is the assignee on this patent?
- Itoi Akihiro, Kaneka Corp
- What technology area does this patent fall under?
- Primary CPC classification B29C44/3461. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Nov 29 2016 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).