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US 5,859,083 AGranted
Water vapor permeable and waterproof polyester membrane pigmented with carbon particles
AssigneeAkzo Nobel N.V.
InventorsJozef Christiaan Wilhelmus Spijkers, Henricus Joannes Maria Van de Ven
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Abstract
A water vapor permeable, waterproof polyether ester membrane contains 1 to 10% by weight of finely dispersed carbon particles, especially soot particles, having an average size of 5 to 40 nm.
Claims6
A process for manufacturing a water vapor permeable, waterproof polyether ester membrane, comprising:
- melting a polyether ester;
- distributing carbon particles having an average size of 5 to 40 nm in said polyether ester under high shear forces to obtain a concentrate in fluid or solid form containing up to 40% by weight carbon particles;
- incorporating said concentrate into additional polyether ester to obtain a polyether ester mass;
- and
- processing said polyether ester mass to obtain a water vapor permeable, waterproof membrane.
2 more elements
Dependencies are inferred from the claim text.