Patent US4127696A successfully refreshed from Google Patents.
US4127696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-core composite filaments and process for producing same
Assignee: Toray Industries Inc
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Filing: 1977-09-06
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Granted: 1978-11-28
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Expires: 1997-09-06
Abstract
Abstract Disclosed are an improved islands-in-a-sea type multi-core composite filament comprising at least two different polymer components and having a cross-section wherein each island is surrounded by some other islands and most of the islands have an approximately quadrilateral to hexagonal cross-section, and also a process for producing the above-said composite filament.
Inventors
- 👤 Miyoshi Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:40
CPC Classifications
D; D03; D03D; D03D27/00; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/36; D03D15/00; D03D15/20; D03D15/283; D03D15/30; D03D15/33; D10; D10B; D10B2321/00; D10B2321/12; D10B2321/121; D10B2331/00; D10B2331/04; Y; Y10; Y10S; Y10S57/00; Y10S57/905; Y10T; Y10T428/00; Y10T428/23907; Y10T428/2395; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2929; Y10T428/2931; Y10T428/2973
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
An islands-in-a-sea type multi-core composite filament comprising at least two different polymer components and having a cross-section wherein each island is surrounded by some other islands, characterized in that the sea component is contained in an amount less than 10% based on the total weight of the polymer components, and most of the islands have an approximately quadrilateral to hexagonal cross-section, the cross-sections of the islands positioned at the most outside portion of said filament being of approximately quadrilateral or pentagonal shape and the cross-sections of the inner islands surrounded by said outside islands being of approximately quadrilateral to nonagonal shape.
Claim 2
Dependent Claim
101 words
An islands-in-a-sea type multi-core composite filament comprising at least two different polymer components and having a cross-section wherein each island is surrounded by some other islands, characterized in that the sea component is contained in an amount less than 10% based on the total weight of the polymer components, and most of the islands have an approximately quadrilateral to hexagonal cross-section, the cross-sections of the islands positioned at the most outside portion of said filament being of approximately quadrilateral or pentagonal shape and the cross-sections of the inner islands surrounded by said outside islands being of approximately quadrilateral to nonagonal shape.
Claim 3
Dependent Claim
31 words
A composite filament according to claim 1, wherein the island component polymer is polyethylene terephthalate and the sea component polymer is polystyrene or a copolymer of styrene and another vinyl monomer.
Claim 4
Dependent Claim
35 words
A composite filament according to claim 2, wherein the ratio of the intrinsic viscosity of polyethylene terephthalate to the intrinsic viscosity of polystyrene the copolymer of styrene is in a range between 0.63 and 1.10.
Claim 5
Dependent Claim
18 words
A composite filament according to claim 1, wherein said sea component content is less than 5% by weight.
Claim 6
Dependent Claim
17 words
A composite filament according to claim 1, wherein the number of the islands is 7 to 1,000.
Claim 7
Dependent Claim
17 words
A composite filament according to claim 1, wherein the number of the islands is 10 to 200.
Claim 8
Dependent Claim
91 words
A process for producing an islands-in-a-sea type multi-core composite filament comprising forming a composite stream consisting of at least two different polymers, wherein a multiplicity of island component streams composed of one or more of the polymers are distributed in a sea component stream of the other polymer, so that said island component streams are arranged on two or more concentric circles, with a content of said island component of no less than 90% based on the total weight of the polymers, and ejecting said composite stream from a spinning orifice.
Claim 9
Dependent Claim
91 words
A process for producing an islands-in-a-sea type multi-core composite filament comprising forming a composite stream consisting of at least two different polymers, wherein a multiplicity of island component streams composed of one or more of the polymers are distributed in a sea component stream of the other polymer, so that said island component streams are arranged on two or more concentric circles, with a content of said island component of no less than 90% based on the total weight of the polymers, and ejecting said composite stream from a spinning orifice.
Claim 10
Dependent Claim
55 words
A process according to claim 7, wherein said island component polymer is polyethylene terephthalate, said sea component polymer is polystyrene or a copolymer of styrene and another vinyl monomer and the ratio of the intrinsic viscosity of polyethylene terephthalate to the intrinsic viscosity of the styrene polymer is in a range between 0.63 and 1.10.
Claim 11
Dependent Claim
25 words
A process according to claim 7, wherein said composite stream is ejected from a spinning orifice of a diameter of no less than 1.0 mm.
Claim 12
Dependent Claim
25 words
A process according to claim 7, wherein said island component streams are formed by discharging the island component polymer from nozzles of a circular cross-section.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |