Microporous PVDF films

Details Microporous PVDF films Microporous PVDF films

2008-03-04

2008-03-04

Chevalier, Alicia (Department: 1794)

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

C428S035700, C428S304400, C428S315500, C428S421000

Reexamination Certificate

active

07338692

ABSTRACT:
Shaped microporous articles are produced from polyvinylidene fluoride (PVDF) and nucleating agents using thermally induced phase separation (TIPS) processes. The shaped microporous article is oriented in at least one direction at a stretch ratio of at least approximately 1.1 to 1.0. The shaped article may also comprise a diluent, glyceryl triacetate. The shaped microporous article may also have the micropores filled with a sufficient quantity of ion conducting electrolyte to allow the membrane to function as an ion conductive membrane. The method of making a microporous article comprises the steps of melt blending polyvinylidene fluoride, nucleating agent and glyceryl triacetate; forming a shaped article of the mixture; cooling the shaped article to cause crystallization of the polyvinylidene fluoride and phase separation of the polyvinylidene fluoride and glyceryl triacetate; and stretching the shaped article in at least one direction at a stretch ratio of at least approximately 1.1 to 1.0.

REFERENCES:
patent: 4255376 (1981-03-01), Soehngen
patent: 4539256 (1985-09-01), Shipman
patent: 4726989 (1988-02-01), Mrozinski
patent: 5013339 (1991-05-01), Mahoney et al.
patent: 5022990 (1991-06-01), Doi et al.
patent: 5910378 (1999-06-01), Debe et al.
patent: 5962544 (1999-10-01), Waller, Jr.
patent: 5985942 (1999-11-01), Steck et al.
patent: 6042959 (2000-03-01), Debe et al.
patent: 6183668 (2001-02-01), Debe et al.
patent: 6254978 (2001-07-01), Bahar et al.
patent: 1553050 (1979-09-01), None
patent: WO 9838029 (1998-09-01), None
patent: WO 9919924 (1999-04-01), None
patent: WO 0009597 (2000-02-01), None
Silberman a et al: “The Effect of Pigments on the Crystallization and Properties of Polypropylene”Polymers for Advanced Technologies, John Wiley and Sons, Chichester, GB, vol. 6, No. 10, Oct. 1, 1995, pp. 643-652, XP000533311, ISSN: 1042-7147.
Mubarak Y; et al: “Effect of Nucleating Agents and Pigments on Crystallization, Morphology, and Mechanical Properties of Polypropylene”Plastics, Rubber and Composites, vol. 29, No. 7, 2000, pp. 307-315, XP009038044.
S. Schneider et al., “Self-nucleation and enhanced nucleation of polyvinylidene fluoride (α-phase)”, Polymer 42, pp. 8787-8798, (2001).

Affiliated with

Also associated with

Rating

Microporous PVDF films does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microporous PVDF films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microporous PVDF films will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2804034