US 11,833,723 B2
Blow-molded foam and process for producing the same
Masaaki Onodera, Yamato (JP); Takehiko Sumi, Yamato (JP); Teruo Tamada, Yamato (JP); Yu Igarashi, Yamato (JP); and Yoshinori Ohno, Yamato (JP)
Assigned to KYORAKU CO., LTD., Kyoto (JP)
Filed by KYORAKU CO., LTD., Kyoto (JP)
Filed on May 21, 2021, as Appl. No. 17/326,645.
Application 17/326,645 is a continuation of application No. 16/457,846, filed on Jun. 28, 2019, granted, now 11,045,982.
Application 16/457,846 is a continuation of application No. 15/156,297, filed on May 16, 2016, granted, now 10,369,727, issued on Aug. 6, 2019.
Application 15/156,297 is a continuation of application No. 13/950,248, filed on Jul. 24, 2013, granted, now 9,340,091, issued on May 17, 2016.
Application 13/950,248 is a continuation of application No. 12/935,520, granted, now 8,517,059, issued on Aug. 27, 2013, previously published as PCT/JP2009/001519, filed on Mar. 31, 2009.
Claims priority of application No. 2008-093894 (JP), filed on Mar. 31, 2008.
Prior Publication US 2021/0276232 A1, Sep. 9, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B29C 44/02 (2006.01); B29C 44/34 (2006.01); B29C 49/00 (2006.01); B29C 49/02 (2006.01); B29C 49/04 (2006.01); B60H 1/00 (2006.01); B29C 49/48 (2006.01); B29K 23/00 (2006.01); B29K 105/04 (2006.01); B29L 23/00 (2006.01); B29L 31/30 (2006.01); B29L 22/00 (2006.01)
CPC B29C 44/02 (2013.01) [B29C 44/3442 (2013.01); B29C 44/3469 (2013.01); B29C 44/352 (2013.01); B29C 49/0005 (2013.01); B29C 49/04 (2013.01); B29C 49/0691 (2022.05); B60H 1/00564 (2013.01); B29C 49/4802 (2013.01); B29K 2023/00 (2013.01); B29K 2023/10 (2013.01); B29K 2023/12 (2013.01); B29K 2105/046 (2013.01); B29L 2022/00 (2013.01); B29L 2023/004 (2013.01); B29L 2031/3005 (2013.01); Y10T 428/1376 (2015.01); Y10T 428/24355 (2015.01)] 9 Claims
OG exemplary drawing
 
1. A process for producing a blow-molded foam including foamed cells, the process comprising:
kneading a polyolefin-based resin containing a foaming agent mixed therewith in an extruder, and
extruding a parison formed of the polyolefin-based resin between split mold blocks from a die slit at an extrusion rate of 700 kg/h or more,
wherein the polyolefin-based resin is a propylene homopolymer having a long-chain branched structure.