Method for reducing cycle time and improving molded part impact

Details Method for reducing cycle time and improving molded part impact Method for reducing cycle time and improving molded part impact

1990-12-19

1992-01-21

Seccuro, Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

26433117, 2643281, 26432817, 264310, C08L 2306, C08L 2308, C08L 2320

Patent

active

050829025

ABSTRACT:
The crystallization half-time and mold cycle time of high density (>0.935 g/cm.sup.3) polyethylene are reduced and the impact energy is improved by blending two linear ethylene polymers differing in density by 0.015 to 0.150 g/cm.sup.3, to achieve a density similar to a single high density polyethylene. Both polymer components and resulting blend have a melt flow ratio (MFR) of less than 35 which indicates a relatively narrow molecular weight distribution. Articles are formed which do not show the severe warpage experienced with conventional nucleating agents, and which exhibit impact properties superior to a similar single high density polyethylene copolymer.

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