Patent ID: 11939429
Assignee: HRL LABORATORIES, LLC
Field: Measurement (Instruments)
Classification: CPC G  C | IPC C  G

Claim 0:
1. An infrared-transparent polymer having a carbon-free polymer backbone, wherein said infrared-transparent polymer is characterized by a density from about 1.2 g/cm3 to about 1.9 g/cm3, an index of refraction from about 1.3 to about 1.9, and at least 70% average transmission of radiation at wavelengths from 3.1 μm to 5 μm and/or from 8.1 μm to 12 μm, wherein said average transmission is defined as the ratio (expressed as a percentage) of radiation intensity through an infrared-transparent polymer thickness of 25 microns divided by incident radiation intensity,
wherein said carbon-free polymer backbone contains a plurality of polymer repeat units of the form, wherein R1 is selected from the group consisting of carboxylates;
wherein R2 is selected from the group consisting of carboxylates;
wherein n is selected from 2 to about 10,000;
wherein said carbon-free polymer backbone is linear, cyclic, branched, or a combination thereof, and
wherein said R1 and said R2 are ionically crosslinked with a divalent metal cation.