Process for making microporous films with improved properties

Details Process for making microporous films with improved properties Process for making microporous films with improved properties

1997-09-16

1998-09-01

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

2642888, 2642896, 2642902, 264346, 264348, B29C 6720

Patent

active

058007580

ABSTRACT:
A distinctive technique for making a microporous film includes a stretching of a layer composed of a polymer material and at least about 5 wt % of a particulate filler material. The particulate filler material has been distinctively treated with an operative amount of surface-active material having a HLB value of not less than about 6. Desirably, the stretching includes a biaxial stretching of the polymer layer.

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American Society for Testing Materials (ASTM) Designation: D 1238-95, "Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer," pp. 273-281, published Jan. 1996.
American Society for Testing Materials (ASTM) Designation: E 96-80, "Standard Test Methods for Water Vapor Transmission of Materials," pp. 742-751, published Feb. 1981.
Dullien, F.A.L., "Porous Media: Fluid Transport and Pore Structure," Academic Press, New York, 1979, pp. 78-83.
Germani, Mark S., "Application of Automated Electron Microscopy to Individual Particle Analysis," American Laboratory, vol. 25, No. 7, Apr. 1993, pp. 17-24.
Nakamura, Shunichi, et al., "Microporous Polypropylene Sheets," Industrial & Engineering Chemistry Research, American Chemical Society, vol. 32, 1993, pp. 221-227.
Nakamura, Shunichi, et al., "Microporous Polypropylene Sheets Containing CaCo3 Filler," Journal of Applied Polymer Science, vol. 49, No. 1, 1993, pp. 143-150.
Vander Wood, T.B., "Introduction to Automated Particle Analysis," Proceedings of 52nd Annual Meeting of Microscopy Society of America--New Orleans--Jul. 31-Aug. 5, 1994, pp. 398-399.
Monte, S.J. et al. "Processing of Composites with Titanate Coupling Agents--A Review". Polymer Engineering and Science, vol. 24, No. 18 (Dec. 1984).

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