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US 5,891,813 AGranted
Articles having a chambray appearance and process for making them
AssigneeBASF SE
InventorDean R. Gadoury
Life of this patent
Estimating the term…
Abstract
Articles made from melamine fibers and aramid fibers are dyed at selected conditions and with selected dyes such that the aramid fiber is dyed but the melamine fiber is not.
Claims5
A process for dyeing heat and flame resistant articles that are made from melamine fibers and aramid fibers comprising:
- exposing a fabric that is made from melamine fibers and aramid fibers to a dyebath containing basic dye, sodium nitrate, and at least one carrier;
- and
- dyeing the fabric at a temperature exceeding about 100.degree. C. such that the aramid fiber is dyed, the melamine fiber is substantially undyed and the fabric exhibits a chambray appearance.
Dependencies are inferred from the claim text.