Copolyester binder filaments and fibers
First Claim
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1. A copolyester binder filament wherein the copolyester consists essentially of a terephthalate of ethylene and diethylene glycols and the mol percent of diethylene glycol based on the mols of terephthalate is within the range of 25 to 35%, with the binder filaments having a crystallinity based on fiber density of less than 25%, and the copolyester having a crystalline half-time at 150°
- C. of greater than 2 minutes.
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Abstract
Novel improved copolyester binder filaments and fibers consist essentially of the terephthalate of ethylene and diethylene glycols with the mol percent of the latter being in the range of 20 to 45 percent.
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Citations
8 Claims
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1. A copolyester binder filament wherein the copolyester consists essentially of a terephthalate of ethylene and diethylene glycols and the mol percent of diethylene glycol based on the mols of terephthalate is within the range of 25 to 35%, with the binder filaments having a crystallinity based on fiber density of less than 25%, and the copolyester having a crystalline half-time at 150°
- C. of greater than 2 minutes.
- View Dependent Claims (2, 3, 4, 5)
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6. A blend of filaments suitable for making a heat-bonded filament structure consisting essentially of filaments of poly(ethylene terephthalate) and from 5 to 35% by weight of binder filaments of a copolyester which consists essentially of a terephthalate of ethylene and diethylene glycols in which copolyester the mol percent of diethylene glycol based on mols of terephthalate is within the range of 25 to 35%, with the binder filaments having a crystallinity based on fiber density of less than 25%, and the copolyester having a crystalline half-time at 150°
- C. of greater than two minutes.
- View Dependent Claims (7, 8)
Specification