Patent ID: 11906252
Assignee: nan
Field: Surface technology, coating (Chemistry)
Classification: CPC F  B  Y | IPC B  F

Claim 0:
1. A composite cooling film comprising an antisoiling layer secured to a first major surface of a reflective microporous layer, wherein the reflective microporous layer comprises a first fluoropolymer and is diffusely reflective of electromagnetic radiation over a majority of wavelengths in the range of 400 to 2500 nanometers, and wherein the antisoiling layer has an outwardly facing antisoiling surface opposite the reflective microporous layer, wherein the outwardly facing antisoiling surface extends along an axis, wherein a plane containing the axis defines a cross section of the layer and intersects the surface to define a line describing the surface in two dimensions, the layer comprising:
a series of micro-structures at least partially defined by the line, the line defining a series of alternating micro-peaks and micro-spaces along the axis, wherein each micro-space comprises a maximum absolute slope defining an angle from the axis of at most 30 degrees, wherein each micro-peak comprises a first micro-segment defining a first average slope and a second micro-segment defining a second average slope, and wherein an angle formed between the first and second average slopes is at most 120 degrees; and
a plurality of nano-structures at least partially defined by the line, the line defining at least one series of nano-peaks disposed on at least the micro-spaces along the axis,
wherein each nano-peak has a height and each corresponding micro-peak has a height of at least 10 times the height of the nano-peak.