PP copolymers tailored for stretch-blow molding.

Two polypropylene random copolymers are the first of a new range of PP resins specifically designed for stretch-blow molding by BP Amoco Chemical Co., Naperville, Ill. They utilize a new fast-heat-up technology to allow for blow molding rates equal to those of PET on standard reheat-blow equipment, BP chime. Acclear HP 1 resins are said to provide better wall-thickness distribution than standard grades of PP while also showing excellent clarity, organoleptics, and stiffness/impact balance. The fast-heat-up technology is said to cut the productivity penalty usually experienced in PP blow molding, making PP highly cost-competitive with PET.

The first two grades have MFRs of 6 and 12 g/10 min. The 6-MFR grade, HP 42851, has 150 kpsi flexural modulus and 0.8 ft-lb/in, notched Izod impact. The 12-melt MFR grade, HP 84491, has 195 kpsi flexural modulus and a 1.9 notched Izod. Tel: [phone] * PTDirect: 624DF