Polytetrafluoroethylene micor powders, their preparation and use

Details Polytetrafluoroethylene micor powders, their preparation and use Polytetrafluoroethylene micor powders, their preparation and use

1995-10-05

1997-06-24

Schofer, Joseph L.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

526247, 526249, 526255, B32B 516, C08F 1624

Patent

active

056415710

ABSTRACT:
Polytetrafluoroethylene micropowders, which can contain up to about 3% by weight of comonomers, are obtained with a narrow molecular weight distribution, a narrow range of specific surface area and a primary particle size of from 150 to 250 nm by polymerization in aqueous medium using hydrogen, methane or ethane as chain transfer agent and at an availability of free radicals remaining essentially constant over the polymerization time. These micropowders are particularly suitable for preparations of polyacetals which give only small deposits in the molds during melt processing and have increased color stability.

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Tuminello, W.H., et al, Macromolecules 21:2606-2610 (1988).
Hawley's Condensed Chemical Dictionary 1987 p. 805.

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