Expanded fluorine type resin products and a preparation process

Details Expanded fluorine type resin products and a preparation process Expanded fluorine type resin products and a preparation process

1997-09-02

1998-09-29

Pezzuto, Helen L.

Stock material or miscellaneous articles

Composite

Of fluorinated addition polymer from unsaturated monomers

428218, 4283144, B32B 2700

Patent

active

058144099

ABSTRACT:
The present invention relates to an expanded product comprising a thermoplastic fluroine type resin which does not have a cross-linking structure and has an expansion ratio of between 4-fold and 30-fold and a closed cell percentage of 40% or more. The expanded product contains at least one interface comprising layers having different cell densities and has a distribution index (Sc) and a coefficient of variation (Cv) of the maximum diameter of an open cell present at an optional cross section of each layer of 0<Sc.ltoreq.6 and 0<Cv.ltoreq.1, respectively, which are represented by the following equations:

REFERENCES:
patent: 4560829 (1985-12-01), Reed et al.
patent: 4615850 (1986-10-01), Pecsok
patent: 4737526 (1988-04-01), Mukaiyama et al.
patent: 4842678 (1989-06-01), Noro et al.
patent: 4954141 (1990-09-01), Takiyama et al.
Kumar, Cell Poly, vol. 12, No. 3, pp. 207-223 (1993).

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