|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||428/3186; 428/3184; 428/3193; 428/3197; 428/3166|
|§371/§102 date||20000517 (20000517)|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 16 인용 특허 : 5|
In the present invention, for the production of a blow-molded foam, there is used a base resin which is mainly composed of a polypropylene resin and has, at 230.degree. C., a melt tension (MT) of 10 gf or over and a melt flow rate (MFR) of 0.5 g/10 minutes or over. A foaming agent is added to the base resin, followed by melt kneading by means of an extruder under high temperature and high pressure conditions to provide a foamable melt. This melt is subjected to extrusion from a circular die 5 and expanded to form a cylindrical foamed parison 4. Thereafte...
1. A blow-molded foam of the type which consists of a hollow molded foam obtained by blow-molding a parison in a desired form, characterized in that it comprises a foamed layer made of a base resin which is mainly composed of a polypropylene resin, wherein the resin forming said foamed layer has, at 230.degree. C., a melt tension (MT) of 5 gf or over and a melt flow rate (MFR) of 1 g/10 minutes or over, and the foamed layer has an average cell diameter from about 0.05 to about 2.2 mm, an average thickness of about 0.5 mm or over, and an average density o...