Claims
- 1. A flexible bubble-free monofilament of at least 0.08 mm in diameter, excellent in transparency, high in impact strength and durability and having a specific gravity of 1.65 to 1.83, a tensile strength of not less than 30 kg/mm.sup.2 and a modulus of elasticity of 60 to 120 kg/mm.sup.2, which is essentially composed of a vinylidene fluoride-based resin, a polymeric substance containing at least 85% by weight of methyl acrylate and a polyester plasticizer and is prepared by the process comprising the steps of:
- melt-spinning of a resin composition consisting essentially of 100 parts by weight of said vinylidene fluoride based resin selected from homopolymers of vinylidene fluoride and copolymers thereof; 5 to 15 parts by weight of said polymeric substance selected from homopolymers of methyl acrylate, copolymers comprising at least 85% by weight of methyl acrylate units and at most 15% by weight of isobutylene units and mixture thereof; and 2 to 7 parts by weight of said polyester plasticizer selected from the group consisting of polyesters of 1,100 to 5,000 in molecular weight obtained from an alcohol of 4 to 7 carbon atoms and a carboxylic acid of 4 to 8 carbon atoms and polyesters of 1,500 to 4,000 in molecular weight obtained from a dihydric alcohol of 2 to 4 carbon atoms and a dicarboxylic acid of 4 to 6 carbon atoms, thereby obtaining an unstretched monofilament,
- stretching the thus obtained unstretched monofilament in a heating medium.
- 2. A flexible monofilament according to claim 1, wherein the thus stretched monofilament is further subjected to relaxation thereby obtaining said flexible monofilament.
- 3. A flexible monofilament according to claim 1, wherein said unstretched monofilament is first stretched 4.0 to 5.5 times in length within the heating medium at a temperature of 150.degree. to 165.degree. C., followed by an additional stretching of 1.1 to 1.2 times in length within the heating medium at a temperature of 160.degree. to 165.degree. C.
- 4. A flexible monofilament according to claim 2, wherein said stretched monofilament is subjected to relaxation of 5 to 20% in length in dry heat of 80.degree. to 160.degree. C.
- 5. A flexible monofilament of claim 1, wherein said polymeric substance is incorporated into the vinylidene fluoride-based resin by an intra-particle post-polymerization of methyl acrylate or a mixture of methyl acrylate and isobuthylene in the particle of said vinylidene fluoride-based resin.
- 6. A flexible monofilament of claim 1, wherein said vinylidene fluoride-based resin is a homopolymer or copolymer of vinylidene fluoride.
- 7. A flexible monofilament according to claim 1, wherein the amount of the said polymeric substance is more than two times by weight as much as that of the polyester plasticizer.
- 8. A flexible monofilament according to claim 1, in the form of a fishing line.
- 9. A flexible monofilament according to claim 2, in the form of a fishing line.
- 10. A flexible monofilament according to claim 3, in the form of a fishing line.
- 11. A flexible monofilament according to claim 4, in the form of a fishing line.
- 12. A flexible monofilament according to claim 5, in the form of a fishing line.
- 13. A flexible monofilament according to claim 6, in the form of a fishing line.
- 14. A flexible monofilament according to claim 7, in the form of a fishing line.
Priority Claims (1)
Number |
Date |
Country |
Kind |
53-9737 |
Jan 1978 |
JPX |
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CROSS-REFERENCE TO RELATED APPLICATION
The present application is a continuation-in-part of application Ser. No. 438,362 filed Oct. 18, 1982, now abandoned, which is a continuation-in-part of application Ser. No. 213,220 filed Dec. 5, 1980, now abandoned, which is a continuation of application Ser. No. 70,123 filed Aug. 27, 1979, now abandoned, which is a continuation-in-part of application Ser. No. 3,861 filed Jan. 16, 1979, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
70123 |
Aug 1979 |
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Continuation in Parts (3)
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Number |
Date |
Country |
Parent |
438362 |
Oct 1982 |
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Parent |
213220 |
Dec 1980 |
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Parent |
3861 |
Jan 1979 |
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