Appeal No. 95-1209
Application No. 07/842,480
The subject matter on appeal relates to compositions of
matter formed by melt blending a thermoplastic polymer and a
fluorinated polysiloxane additive to provide a homogenous
blend, then cooling the composition. The additive is said to
concentrate at the surfaces of the cooled blends, even at low
overall concentrations, and to provide low surface energies,
including non-adherent surface characteristics and low
friction, which enhance molding operations. Biological and
biomedical applications are disclosed to be particularly
advantageous. Specification at pages 5-6.
Claim 1 is representative of the claimed subject matter:
1. A composition of matter formed by melt-blending
a thermoplastic polymer and from about 0.01% to less
than about 1.0%, by weight based on the weight of
the composition, of an additive comprising a
polyfluoroalkylsiloxane, said additive having a
lower surface energy than that of said polymer; said
melt-blending resulting in a substantially
homogenous admixture of said polymer and said
additive; said admixture, upon cooling, resulting in
a solid composition wherein a concentration of said
additive through a cross-section of said solid
composition is lower in the interior thereof and
higher at the surfaces thereof; said additive being
a polyfluoroalkylsiloxane having the formula:
2
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