Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Extrusion molding
Patent
1995-06-06
1997-07-08
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Extrusion molding
264483, 264514, 26417128, 26417314, 26417315, 26417319, B29C 3510, B29C 4706
Patent
active
056457880
ABSTRACT:
An oriented multilayer film comprises a barrier layer of polymerized ethylene vinyl alcohol, and an orientation-compatible polymeric layer having a modulus of at least about 4.times.10.sup.4 psi. The a barrier layer occupies from about 2 to 15 volume percent of the oriented multilayer film, and has a thickness of from about 0.01 to 0.75 mils. The polymerized ethylene vinyl alcohol has an ethylene content of from about 38 to 48 weight percent. The orientation compatible layer has a thickness of from about 0.49 to 4.5 mils. The multilayer film is oriented at a temperature of from about 165.degree. F. to 212.degree. F., has an orientation ratio greater than 9, an oxygen permeability at 0% relative humidity of from about 1 and 6 cm.sup.3 -mil/day-m.sup.2 -atm, and a total thickness of from about 0.5 to 5 mils.
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Hurley Jr. Rupert B.
Thurlow Jeffery R.
W.R. Grace & Co.-Conn.
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