Polypropylene yarn having increased Young's modulus and method of making same
AssigneeNicolon Corporation
InventorsDavid Michael Jones, Kevin Nelson King
Life of this patent
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Abstract
The present invention is directed to a monofilament, a yarn, a tape, or a staple fiber, each having 1 to 12,000 Denier per filament, a draw ratio of 2.5:1 to 25:1, and made of a polypropylene composition of a melt blended admixture of about 93% by weight of polypropylene, about 5% by weight of a polypropylene/ethylene copolymer, and about 2 wt. % of an additive. Also, a process for preparing the monofilament, yarn, tape, or staple fiber is disclosed.
Claims27
A monofilament, a yarn, or a tape, each having a draw ratio of about 11.5 to about 25:1 and comprising:
- a melt blended admixture of about 94 to about 95% by weight of polypropylene and about 5 to about 6% by weight of a polypropylene/ethylene copolymer having an ethylene content of 8% to 25% by weight of copolymer;
- wherein the monofilament, yarn, or tape respectively is a homogenous construction and has a Young's modulus greater than 3.5 GPa.
A monofilament, a yarn, or a tape, each having a draw ratio of about 11.5 to about 25:1 and comprising:
- a melt blended admixture of about 93% by weight of polypropylene, about 5% by weight of a polypropylene/ethylene copolymer having an ethylene content of 8% to 25% by weight of copolymer, and about 2 wt. % of an additive;
- wherein the monofilament, yarn, or tape respectively is a homogenous construction and has a Young's modulus greater than 3.5 GPa.
A process for preparing a slit film tape comprising:
- a) preparing a composition comprising about 94 to about 95% by weight of polypropylene and about 5 to about 6% by weight of a polypropylene/ethylene copolymer having an ethylene content of 8% to 25% by weight of copolymer;
- b) forming the composition into a film;
- c) slitting the film into a tape;
- and
- d) hot-drawing the tape at a temperature below the melting point of the composition and at a draw ratio between about 11.5 and about 25:1 to produce the slit film tape with a homogenous construction and a Young's modulus greater than 3.5 GPa.
A process for preparing a slit film tape comprising:
- a) preparing a composition comprising about 93% by weight of polypropylene, about 5% by weight of a polypropylene/ethylene copolymer having an ethylene content of 8% to 25% by weight of copolymer, and about 2 wt. % of an additive;
- b) forming the composition into a film;
- c) slitting the film into a tape;
- and
- d) hot-drawing the tape at a temperature below the melting point of the composition and at a draw ratio between about 11.5 and about 25:1 to produce the slit film tape with a homogenous construction and a Young's modulus greater than 3.5 GPa.
A process for preparing a monofilament comprising:
- a) preparing a composition comprising about 94 to about 95% by weight of polypropylene homopolymer and about 5 to about 6% by weight of a polypropylene/ethylene copolymer having an ethylene content of 8% to 25% by weight of copolymer;
- b) forming the composition into a filament;
- and
- c) hot-drawing the monofilament at a temperature below the melting point of the homopolymer and at a draw ratio between about 11.5 and about 25:1 to produce the monofilament with a homogenous construction and a Young's modulus greater than 3.5 GPa.
A process for preparing a monofilament comprising:
- a) preparing a composition comprising about 93% by weight of polypropylene, about 5% by weight of a polypropylene/ethylene copolymer having an ethylene content of 8% to 25% by weight of copolymer, and about 2 wt. % of an additive;
- b) forming the composition into a filament;
- and
- c) hot-drawing the monofilament at a temperature below the melting point of the homopolymer and at a draw ratio between about 11.5 and about 25:1 to produce the monofilament with a homogenous construction and a Young's modulus greater than 3.5 GPa.
A monofilament, a yarn, or a tape, each having a draw ratio of about 11.5 to about 25:1 and a tenacity of at least 0.75 g/Denier at 1% strain, at least 1.5 g/Denier at 2% strain, and at least 3.75 g/Denier at 5% strain, and comprising:
- a melt blended admixture of about 94 to about 95% by weight of polypropylene and about 5 to about 6% by weight of a polypropylene/ethylene copolymer having an ethylene content of about 8% to about 25% by weight of copolymer;
- wherein the monofilament, yarn, or tape respectively is a homogenous construction.
A monofilament, a yarn, or a tape, each having a draw ratio of about 11.5 to about 25:1 and a tenacity of at least 0.75 g/Denier at 1% strain, at least 1.5 g/Denier at 2% strain, and at least 3.75 g/Denier at 5% strain, and comprising:
- a melt blended admixture of about 93% by weight of polypropylene, about 5% by weight of a polypropylene/ethylene copolymer having an ethylene content of 8% to 25% by weight of copolymer, and about 2 wt. % of an additive;
- wherein the monofilament, yarn, or tape respectively is a homogenous construction.
Dependencies are inferred from the claim text.