MULTI-LAYER EXPANSION-MOLDED ARTICLE OF POLYPROPYLENE RESIN, PRODUCTION PROCESS THEREOF, AND CONTAINER, SHOCK-ABSORBING MATERIAL FOR AUTOMOBILE AND AUTOMOTIVE MEMBER FORMED OF THE MULTI-LAYER EXPANSI
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-001/00
B32B-001/08
B29B-009/00
출원번호
US-0629949
(2000-08-01)
우선권정보
JP-0225346 (1999-08-09)
발명자
/ 주소
Kogure, Naochika
Gokuraku, Hiroyuki
Takahashi, Seiji
Imanari, Daisuke
Kitahama, Takashi
출원인 / 주소
JSP Corporation
대리인 / 주소
Sherman &
인용정보
피인용 횟수 :
28인용 특허 :
6
초록▼
A multi-layer expansion-molded article of a polypropylene resin, which is obtained by molding a multi-layer parison comprising a foamed resin layer and a resin layer provided on the outer side of the foamed resin layer in a mold in such manner that at least part of the opposed inner surfaces of foam
A multi-layer expansion-molded article of a polypropylene resin, which is obtained by molding a multi-layer parison comprising a foamed resin layer and a resin layer provided on the outer side of the foamed resin layer in a mold in such manner that at least part of the opposed inner surfaces of foamed resin layer in the parison are fusion-bonded to each other, and has a polypropylene resin layer on the surface of a foamed polypropylene resin layer, wherein a melt tension, MTfr (gf) and a melt flow rate, MFRfr (g/10 min) obtained by measurement to a polypropylene resin forming the foamed resin layer in the expansion-molded article satisfy the relationship [log MTfr>?0.74 log MFRfr+0.66], and a melt tension, MTur (gf) and a melt flow rate, MFRur (g/10 min) obtained by measurement to a polypropylene resin forming the resin layer on the surface of the foamed resin layer satisfy the relationship [log MTur>?1.02 log MFRur+0.47].
대표청구항▼
1. A skin-bearing article molded from a multi-layer foamed parison having inner surfaces mutually welded, comprising:a foamed polypropylene resin layer having a density of 25 to 400 kg/m3 formed from a first raw resin, and an unfoamed polypropylene resin layer formed from a second raw resin provided
1. A skin-bearing article molded from a multi-layer foamed parison having inner surfaces mutually welded, comprising:a foamed polypropylene resin layer having a density of 25 to 400 kg/m3 formed from a first raw resin, and an unfoamed polypropylene resin layer formed from a second raw resin provided on the outer side of the foamed polypropylene resin layer said first raw resin forming the foamed polypropylene resin layer having a melt tension, MTfr (gf), and a melt flow rate, MFRfr (g/10 min), and satisfying the following relationship (1), and said second raw resin forming the unfoamed polypropylene resin layer having a melt tension, MTur (gf), and a melt flow rate, MFRur (g/10 min), and satisfying the following relationships (2) and (3) log MTfr>?0.74 log MFRfr+0.66??(1) log MTur>?1.02 log MFRur+0.47 where MFRur?0.3??(2) MTur?10 (gf) where 0.1?MFRur<0.3??(3). 2. A skin-bearing article molded from a multi-layer foamed parison having inner surfaces mutually welded, comprising:a foamed polypropylene resin layer having a density of 25 to 400 kg/m3, and an unfoamed polypropylene resin layer provided on the outer side of the foamed polypropylene resin layer the foamed polypropylene resin layer in the skin-bearing article having a melt tension, MTfl (gf), and a melt flow rate, MFRfl (g/10 min), and satisfying the following relationship (4), and the unfoamed polypropylene resin layer on the surface of the foamed polypropylene resin layer having a melt tension, MTrl (gf), and a melt flow rate, MFRrl (g/10 min), and satisfying the following relationships (5) and (6) log MTfl>?0.74 log MFRfl+0.79??(4) log MTrl>?1.02 log MFRrl+0.69 where MFRrl?0.5??(5) MTrl?10 (gf) where 0.2?MFRrl<0.5??(6). 3. The skin-bearing article according to claim 1 or 2, wherein the thickness of the unfoamed polypropylene resin layer formed on the surface of the foamed polypropylene resin layer is 100 μm to 10 mm, and the overall density of the skin-bearing article is 20 to 400 kg/m3.4. The skin-bearing article according to claim 1 or 2, wherein the area ratio of the mutually welded portion in the inner surface of the skin-bearing article is at least 25%.5. The skin-bearing article according to claim 1 or 2, wherein the area ratio of the mutually welded portion in the inner surface of the skin-bearing article is at least 60%.6. The skin-bearing article according to claim 1 or 2, wherein the area ratio of the mutually welded portion in the inner surface of the skin-bearing article is at least 80%.7. The skin-bearing article according to claim 1 or 2, wherein the area ratio of the mutually welded portion in the inner surface of the skin-bearing article is at least 95%.8. The skin-bearing article according to claim 1 or 2, which further has a skin layer formed of a synthetic resin on the outer side of the unfoamed polypropylene resin layer.9. A container formed of the skin-bearing article according to claim 1 or 2, wherein the overall density of the container is 30 to 400 kg/m3, and the thickness of the unfoamed polypropylene resin layer is 200 μm to 5 mm.10. A shock-absorbing material for automobile formed of the skin-bearing article according to claim 1 or 2, wherein the overall density of the shock-absorbing material is 25 to 300 kg/m3 and the thickness of the unfoamed polypropylene resin layer is 200 μm to 7 mm.11. A member for automobile formed of the skin-bearing article according to claim 1 or 2.12. The member for automobile according to claim 11, wherein the member for automobile is a member selected form among a bumper, pillar, instrument panel, spoiler, fender, side step, door trim, grille guard and trunk board.
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