Polyethylene heat shrinkable tube

Details Polyethylene heat shrinkable tube Polyethylene heat shrinkable tube

2005-05-03

2005-05-03

Pyon, Harold (Department: 1772)

Stock material or miscellaneous articles

Hollow or container type article

Shrinkable or shrunk

C428S035100, C428S036900, C428S036920

Reexamination Certificate

active

06887539

ABSTRACT:
The present invention improves the concentricity after expansion process of a heat shrinkable tube which is required to have a thin wall and hardness, and further aims to obtain elongation of 100% or more in a heat aging test, copperstability test, and heat shock test. The heat shrinkable tube satisfying such aim uses a medium- or high-density polyethylene that has a molecular weight distribution (Mw/Mn) of 30 to 55, an MFR of 0.05 to 0.2, and a specific gravity of 0.94 to 0.96. A medium- or high-density polyethylene obtained by combining an ethylene-vinyl acetate copolymer, ethylene-ethylacrylate copolymer, ethylene-methylacrylate copolymer, and ethylene-ethylmethacrylate copolymer may be used. More preferably, for an antioxidant, phenol-based and sulfur-based antioxidants are used together and zinc oxide is added.

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Fred Billmeyer, Jr., Textbook of Polymer Science, 1984, John Wiley & Sons, third edition, pp. 364-365.

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