PURPOSE: To enhance the transparency, impact resistance and moldability of a multilayered blow molded object made of polypropylene by constituting the outermost layer of the blow molded object of isotactic polypropylene and constituting at least one of the inner layers thereof of syndiotactic polypropylene.
CONSTITUTION: The outermost layer of a multilayered blow molded object is constituted of isotactic polypropylene and at least one of the inner layers thereof is constituted of syndiotactic polypropylene. As syndiotactic polypropylene, a copolymer containing a small amt. of olefins or dienes may be used so far as transparency, impact resistance and moldability are not markedly damaged. Further, various elastomers or isotactic polypropylene can be added to a degree not damaging transparency. Herein, the sum total thickness other than the syndiotactic polypropylene layer developing transparency or impact resistance inclusive of the outer layer of the blow molded product is pref. 50% or less of the total thickness.
UEDA SHUNJI
KAWASUMI TAMIO
HASHIMOTO MASAMI
MINAMI KAZUTO
DAINIPPON POLYMER KK
Next Patent: PARISON POSITION ADJUSTING MECHANISM