Processes and compositions for injection blow molding

摘要

The invention provides a process for injection blow molding an article, said process comprising injecting into a mold cavity a composition, comprising at least one ethylene-based polymer and less than, or equal to, 1000 ppm of a mold release agent, based on the total weight of the composition. The invention also provides a composition comprising a blend, wherein the blend comprises at least one high molecular weight (HMW) ethylene-based polymer, and at least one low molecular weight (LMW) ethylene-based polymer, and wherein the blend has an unsaturation level, as determined by IR, and expressed as vinyls per 1000 carbon atoms, less than, or equal to, 0.5 vinyls per 1000 carbon atoms, and wherein the high molecular weight (HMW) ethylene-based polymer has a density from 0.925 to 0.950 g/cc.

主权项

1. A process for injection blow molding an article, said process comprising injecting into a mold cavity a composition, comprising at least one ethylene-based polymer and less than, or equal to, 1000 ppm of a mold release agent, based on the total weight of the composition, and
wherein the composition has a molecular weight distribution (Mw/Mn) from 8 to 30, as determined by high temperature GPC, equipped with an infrared detector; and wherein the composition has a high flow melt index (I21) from 22 to 32 g/10 min; and wherein the composition is injected around a core pin to form a pre-form, and the pre-form is inserted into the mold cavity and equilibrated at an elevated temperature; and wherein air is blown into the inner area of the pre-form, and the mold cavity is cooled to form the article, and the article is released from the mold cavity, and wherein the composition comprises at least one high molecular weight (HMW) ethylene-based polymer, and at least one low molecular weight (LMW) ethylene-based polymer, and wherein the LMW ethylene-based polymer has a melt index, I2, from 300 g/10 min to 900 g/10 min; and wherein both the high molecular weight (HMW) ethylene-based polymer, and the low molecular weight (LMW) ethylene-based polymer are prepared using a Ziegler/Natta catalyst.