EP0085972A2
Expired / Lapsed
EP
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Polyamide fibers having improved properties, and their production
Assignee: Toyobo Co Ltd
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Filing: 1983-02-05
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Granted: —
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Expires: 2003-02-05
Abstract
Abstract A polyamide fiber excellent in strength, which is characterized by having a relative viscosity of not less than 2.3 (measured on a 96 % by weight sulfuric acid solution having a polyamide concentration of 10 mg/ml at 20°C), having an index of birefringence in section which satisfies the following relationship: (wherein Δn A is the index of birefringence of fiber at the position of r/R = 0.9, Δn B is the index of birefringence of fiber at the position of r/R = 0.0, R is the radius of the fiber section and r is the distance from the central axis of the fiber section), and showing the following physical constants: Index of birefringence of fiber (Δn) (measured after 24 hours under the conditions of 30°C and 80 % relative humidity) ≥ 50 x 10 -3 ; Break strength ≥ 11g/d; Fiber long period spacing value at length by small angle X-ray diffraction ≥ 100 A; Specific gravity ≥ 1.140; Dry heat shrinkage ≤ 15 %.
Inventors
- 👤 Kazuo Kurita
- 👤 Hideaki Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 15:54
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; Y; Y10; Y10S; Y10S57/00; Y10S57/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2913; Y10T428/2929
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
165 words
A polyamide fiber excellent in strength, which is characterized by having a relative viscosity of not less than 2.3 (measured on a 96 % by weight sulfuric acid solution having a polyamide concentration of 10 mg/ml at 20°C), having an index of birefringence in section which satisfies the following relationship: (wherein Δn A is the index of birefringence of fiber at the position of r/R = 0.9, Δn B is the index of birefringence of fiber at the position of r/R = 0.0, R is the radius of the fiber section and r is-the distance from the central axis of the fiber section), and showing the following physical constants: Index of birefringence of fiber (An) (measured after 24 hours under the conditions of 30°C and 80 % relative humidity) ≧ 50. x 10 -3 ; Break strength ≧ 11 g/d; Fiber long period spacing value at length by small angle X-ray diffraction ≧ 100 A; Specific gravity ≧ 1.140; Dry heat shrinkage < 15 %.
Claim 2
Dependent Claim
165 words
A polyamide fiber excellent in strength, which is characterized by having a relative viscosity of not less than 2.3 (measured on a 96 % by weight sulfuric acid solution having a polyamide concentration of 10 mg/ml at 20°C), having an index of birefringence in section which satisfies the following relationship: (wherein Δn A is the index of birefringence of fiber at the position of r/R = 0.9, Δn B is the index of birefringence of fiber at the position of r/R = 0.0, R is the radius of the fiber section and r is-the distance from the central axis of the fiber section), and showing the following physical constants: Index of birefringence of fiber (An) (measured after 24 hours under the conditions of 30°C and 80 % relative humidity) ≧ 50. x 10 -3 ; Break strength ≧ 11 g/d; Fiber long period spacing value at length by small angle X-ray diffraction ≧ 100 A; Specific gravity ≧ 1.140; Dry heat shrinkage < 15 %.
Claim 3
Dependent Claim
28 words
The polyamide fiber according to claim 1, which comprises polycapramide in an amount of not less than 75 % by weight on the basis of the polyamide fiber.
Claim 4
Dependent Claim
19 words
The polyamide fiber according to claim 1, wherein the relative viscosity of the polyamide is not less than 3.0.
Claim 5
Dependent Claim
17 words
The polyamide fiber according to claim 1, of which the monofilament has not more than 35 denier.
Claim 6
Dependent Claim
20 words
The polyamide fiber according to claim 1, of which the initial modulus of elasticity is not less than 40 g/d.
Claim 7
Dependent Claim
25 words
The polyamide fiber according to claim 1, of which the heat stress peak temperature with temperature elevation of constant length is not lower than 200°C.
Claim 8
Dependent Claim
28 words
The polyamide fiber according to claim 1, of which the temperature (Ta) giving a maximum dynamic loss tangent (Tanδ) determined at 110 Hz is not lower than 110°C.
Claim 9
Dependent Claim
32 words
The polyamide fiber according to claim 1, of which the apparent crystal size (ACS) at the plane (200) obtainable by a broad angle X-ray diffraction is not less . than 55 A.
Claim 10
Dependent Claim
20 words
The polyamide fiber according to claim 1, of which the initial modulus of elasticity is not less than 50 g/d.
Claim 11
Dependent Claim
26 words
The polyamide fiber according to claim 1, of which the peak temperature of heat stress on temperature elevation with constant length is not lower than 210°C.
Claim 12
Dependent Claim
28 words
The polyamide fiber according to claim 1, of which the temperature (Tα) giving a maximum dynamic loss tangent (Tan6) determined at 110 Hz is not lower than 115°C.
Claim 13
Dependent Claim
30 words
The polyamide fiber according to claim 1, of which the maximum value of the dynamic loss modulus of elasticity is not less than 2.5 x 10 9 dyne/cm 2 .
Claim 14
Dependent Claim
38 words
The polyamide fiber according to claim 1, of which the index of birefringence (An) is not less than 55 x 10 -3 and (Δn A - Δn B ) is not more than -1.0 x 10 -3 .
Claim 15
Dependent Claim
19 words
The polyamide fiber according to claim 1, of which the fiber long period is not less than 110 A.
Claim 16
Dependent Claim
18 words
The polyamide fiber according to claim 1, of which the break strength is not less than 12 g/d.
References Cited (Backward Citations)
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