Dyed sheath/core fibers and methods of making same
First Claim
1. A sheath/core filament comprising a sheath formed of an essentially non-dyeable nylon sheath polymer which is resistant to, and thereby essentially undyed by, dyes, and a core entirely surrounded by the sheath and formed of a dyeable core polymer which is susceptible to dyeing by the dyes, wherein said filament includes less than about 10 wt. % of said sheath polymer.
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Accused Products
Abstract
Dyeable and dyed filaments have a core and a sheath which entirely surrounds the core. The core is formed of a core polymer which is susceptible to dyeing by a dye bath chemical, while the sheath is formed of a sheath polymer which is resistant to dyeing by the dye bath chemical. When the filament is brought into contact with a dye bath containing the dye chemical, the dye chemical in the dye bath will physically diffuse or migrate through the sheath polymer to cause the core polymer to be dyed a color of the dye bath chemical, while the sheath polymer is substantially undyed thereby.
87 Citations
8 Claims
- 1. A sheath/core filament comprising a sheath formed of an essentially non-dyeable nylon sheath polymer which is resistant to, and thereby essentially undyed by, dyes, and a core entirely surrounded by the sheath and formed of a dyeable core polymer which is susceptible to dyeing by the dyes, wherein said filament includes less than about 10 wt. % of said sheath polymer.
Specification