Process for preparing surface-modified biaxially oriented film o

Details Process for preparing surface-modified biaxially oriented film o Process for preparing surface-modified biaxially oriented film o

1995-06-05

1997-04-29

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Limited to treatment of surface or coated surface

264448, 264469, 264470, 264 41, 2642888, 2642896, 264344, 264DIG47, B29C 3510, B29C 7104

Patent

active

056246277

ABSTRACT:
The biaxially oriented films of high molecular weight polyethylene is formed and its surface modified to provide a hydrophilic property to the resulting film. The film is prepared by melt-kneading the high molecular weight polyethylene with an ordinarily solid hydrocarbon plasticizer and a raw fabric sheet is formed from the resulting molten mixture. After the hydrocarbon plasticizer is extracted the resulting unstretched sheet is stretched under conditions providing a stretched film having a specific surface area of 70 m.sup.2 /g or more and a fibril structure. This stretched film is then heated under standard length constraint conditions to reduce the specific surface area of the stretched film by at least 20 m.sup.2 /g to obtain a biaxially oriented film of high molecular weight polyethylene. The surface of the film is thereafter subjected to surface modification by polymerizing a vinyl monomer having a hydrophilic group on the surface of the film whereby the film surface becomes hydrophilic, as measured by a contact angle of the film surface to a water drop at a level of not more than 90.degree.. The biaxially oriented films are further characterized by their excellent gas permeability, surface smoothness, tensile modulus and tensile strength.

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