Patent US3658634A successfully refreshed from Google Patents.
US3658634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-retardant sheath and core type conjugate fiber
Assignee: Toray Industries Inc
•
Filing: 1970-08-20
•
Granted: 1972-04-25
•
Expires: 1990-08-20
Abstract
Abstract The present invention relates to a sheath and core type conjugate fiber obtained by providing a core composed of polymer prepared by blending a specific halogen substituted aromatic compound and phosphorus compound in predetermined amounts and by wrapping said core component with a sheath component. The fire-retardancy of the sheath and core type conjugate fiber of this invention is remarkably high because a polymer having a high halogen concentration is used as the core component of the conjugate fiber.
Inventors
- 👤 Masana Yanagi
- 👤 Itaru Nakamura
- 👤 Masayuki Ohosugi
- 👤 Kiyosi Takizawa
- 👤 Masanori Kakinami
- 👤 Chikara Sano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:14
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/07; D01F8/00; D01F8/04; D01F8/14; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2973
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
50 words
The fiber defined in clam 1, wherein the sheath polymer also contains said halogenated fire-retardant and said phosphorus compound fire-retardant, in a lesser percentage than in said core polymer, and wherein the maximum weight of halogen in the sheath component is 10 percent of the weight of the sheath polymer.
Claim 2
Dependent Claim
114 words
A fire-retardant sheath and core type conjugate fiber comprising (A) a core composed of a thermoplastic polymer containing a blend of (a) a halogenated member selected from the group consisting of a ring compound represented by the general formula (I), halogenated naphthalene wherein the halogen is selected from the group consisting of chlorine and bromine, and halogenated anthracene wherein the halogen is selected from the group consisting of chlorine and bromine, and (b) a phosphorus-containing compound selected from the compounds represented by the general formulae (II) and (III) the total amount of halogen contained in said core polymer being above about 5.0 percent by weight based on the amount of thermoplastic polymer, and wherein:
Claim 3
Dependent Claim
34 words
Sheath and core type conjugate fiber according to claim 3 wherein the percentage of halogen in the sheath is below 10.0 percent by weight of the weight of the thermoplastic polymer in the sheath.
Claim 4
Dependent Claim
63 words
Sheath and core type conjugate fiber according to claim 3 wherein the core contains bromine and the amount of bromine contained in the core is more than 5.0 percent by weight based on the weight of thermoplastic polymer in the core and the sheath contains less than 5.0 percent by weight of bromine based on the amount of thermoplastic polymer in the sheath.
Claim 5
Dependent Claim
58 words
Sheath and core type conjugate fiber according to claim 4 wherein the core contains chlorine in an amount that is more than 10.0 percent by weight based on the weight of thermoplastic polymer in the core, and the sheath contains less than 10.0 percent by weight of chlorine based on the amount of thermoplastic polymer in the sheath.
Claim 6
Dependent Claim
25 words
Sheath and core type conjugate fiber according to claim 3 wherein the formula (I) compound is selected from the group consisting of hexabromobenzene and pentabromotoluene.
Claim 7
Dependent Claim
17 words
Sheath and core type conjugate fiber according to claim 3 wherein the formula (II) compound is triphenylphosphate.
Claim 8
Dependent Claim
17 words
Sheath and core type conjugate fiber according to claim 3 wherein the formula (III) compound is triphenylphosphite.
Claim 9
Dependent Claim
27 words
Sheath and core type conjugate fiber according to claim 3 wherein the blending ratio by volume of the core and the sheath is from 80/20 to 20/80.
Claim 10
Dependent Claim
25 words
Sheath and core type conjugate fiber according to claim 3 wherein the cross-sectional thickness of the sheath is more than 1 Mu . Mu .
Claim 11
Dependent Claim
17 words
Sheath and core type conjugate fiber according to claim 3 wherein the thermoplastic polymer is Nylon 6.
Claim 12
Dependent Claim
17 words
Sheath and core type conjugate fiber according to claim 3 wherein said thermoplastic polymer is Nylon 66.
Claim 13
Dependent Claim
32 words
Sheath and core type conjugate fiber according to claim 3 wherein said thermoplastic polymer is a polyester wherein at least 70 percent of the recurring unit thereof is composed of polyethylene terephthalate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |