EP0414047A2
Expired / Lapsed
EP
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A novel polypropylene fiber and a preparation process thereof
Assignee: Mitsui Chemicals Inc
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Filing: 1990-08-08
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Granted: —
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Expires: 2010-08-08
Abstract
Abstract A fiber excellent in strength and having an average size of 10,000 - 0.1 denier can be obtained by extruding a raw material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more and optionally stretching the resulting extruded material. By using as the raw material a composition consisting of two kinds of polypropylenes each having an intrinsic viscosity η₁ or η₂, the log(η₂/η₁) being more than 0.05 or less than -0.05, and a syndiotactic pentad fraction of 0.7 or more at a weight ratio of 95 : 5 - 5 : 95 or a composition consisting of at least 50 parts by weight of a syndiotactic polypropylene having the intrinsic viscosity η₁ and a syndiotactic pentad fraction of 0.7 or above and at most 50 parts by weight of an isotactic polypropylene having the intrinsic viscosity η₂, the extrudability is improved and the fiber stretching conditions are broadened.
Inventors
- 👤 Tadashi Asanuma
- 👤 Tetsunosuke Shiomura
- 👤 Shigeru Kimura
- 👤 Nobutaka Uchikawa
- 👤 Yoichi Kawai
- 👤 Keigo Suehiro
- 👤 Satoshi Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 11:21
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
31 words
A fiber with an average size of 10,000 - 0.1 denier formed by extruding a raw material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more.
Claim 2
Dependent Claim
31 words
A fiber with an average size of 10,000 - 0.1 denier formed by extruding a raw material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more.
Claim 3
Dependent Claim
12 words
The fiber according to Claim 1 wherein the extruded material is stretched.
Claim 4
Dependent Claim
24 words
The fiber according to Claim 1 or 2 wherein said raw material is a polypropylene having a syndiotactic pentad fraction of 0.7 or more.
Claim 5
Dependent Claim
45 words
The fiber according to Claim 1 or 2 wherein said raw material is a composition comprising at least 50 parts by weight of a polypropylene having a syndiotactic pentad fraction of 0.7 or more and at most 50 parts by weight of an isotactic polypropylene.
Claim 6
Dependent Claim
113 words
The fiber according to Claim 1 or 2 wherein said raw material is a composition comprising a polypropylene (A) having a syndiotactic pentad fraction of 0.7 or more and a polypropylene (B) having a different molecular weight and a syndiotactic pentad fraction of 0.7 or more, the value of common logarithms of the ratio of the intrinsic viscosity η₂ of the polypropylene (B) to the intrinsic viscosity η₁ of the polypropylene (A) [log(η₂/η₁)], both measured in a tetralin solution at 135°C, being either more than 0.05 or less than -0.05, the weight ratio of the polypropylene (A) to the polypropylene (B) being in the range of 95 : 5 - 5 : 95.
Claim 7
Dependent Claim
111 words
The fiber according to Claim 1 or 2 wherein said raw material is a composition comprising a polypropylene (A) having a syndiotactic pentad fraction of 0.7 or more and an isotactic polypropylene (B) having a different molecular weight, the value of common logarithms of the ratio of the intrinsic viscosity η₂ of the polypropylene (B) to the intrinsic viscosity η₁ of the polypropylene (A) [log(η₂/η₁)], both measured in a tetralin solution at 135°C, being either more than 0.05 or less than -0.05, the weight proportion of the polypropylene (A) and the polypropylene (B) being at least 50 parts for the polypropylene (A) and at most 50 parts for the polypropylene (B).
Claim 8
Dependent Claim
25 words
A process for preparing a fiber comprising extruding a raw material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more.
Claim 9
Dependent Claim
25 words
A process for preparing a fiber comprising extruding a raw material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more.
Claim 10
Dependent Claim
12 words
The process according to Claim 7 wherein the extruded material is stretched.
Claim 11
Dependent Claim
28 words
The process for preparing a fiber according to Claim 7 or 8 wherein said raw material is a polypropylene having a syndiotactic pentad fraction of 0.7 or more.
Claim 12
Dependent Claim
49 words
The process for preparing a fiber according to Claim 7 or 8 wherein said raw material is a composition comprising at least 50 parts by weight of a polypropylene having a syndiotactic pentad fraction of 0.7 or more and at most 50 parts by weight of an isotactic polypropylene.
Claim 13
Dependent Claim
117 words
The process for preparing a fiber according to Claim 7 or 8 wherein said raw material is a composition comprising a polypropylene (A) having a syndiotactic pentad fraction of 0.7 or more and a polypropylene (B) having a different molecular weight and a syndiotactic pentad fraction of 0.7 or more, the value of common logarithms of the ratio of the intrinsic viscosity η₂ of the polypropylene (B) to the intrinsic viscosity η₁ of the polypropylene (A) [log(η₂/η₁)], both measured in a tetralin solution at 135°C, being either more than 0.05 or less than -0.05, the weight ratio of the polypropylene (A) to the polypropylene (B) being in the range of 95 : 5 - 5 : 95.
Claim 14
Dependent Claim
115 words
The process for preparing a fiber according to Claim 7 or 8 wherein said raw material is a composition comprising a polypropylene (A) having a syndiotactic pentad fraction of 0.7 or more and an isotactic polypropylene (B) having a different molecular weight, the value of common logarithms of the ratio of the intrinsic viscosity η₂ of the polypropylene (B) to the intrinsic viscosity η₁ of the polypropylene (A) [log(η₂/η₁)], both measured in a tetralin solution at 135°C, being either more than 0.05 or less than -0.05, the weight proportion of the polypropylene (A) and the polypropylene (B) being at least 50 parts for the polypropylene (A) and at most 50 parts for the polypropylene (B).
References Cited (Backward Citations)
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