US4138445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant fiber
Assignee: Toray Industries Inc
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Filing: 1977-10-25
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Granted: 1979-02-06
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Expires: 1997-10-25
Abstract
Abstract A flame-retardant fiber is made comprising 20 - 95% by weight of amino resin condensate of an amino compound and formaldehyde in which the amino compound may be a melamine, combined melamine and guanamine, combined melamine and urea, combined melamine, guanamine and urea, and benzoguanamine and/or urea, and in which the chemical bond linking the polymer chain is for the most part methylene linkage and 80 - 5% by weight of polyvinylalcohol, the resulting fiber being cured when necessary and having a tensile strength of at least 1.0 g/d., and having a break elongation of at least 5%.
Inventors
- 👤 Tatsuo Nogi
- 👤 Yasuo Yoshizawa
- 👤 Kanzi Kashihara
- 👤 Nobuo Yoshizumi
- 👤 Yoshizo Tsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:34
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/88; D01F6/94; C; C08; C08L; C08L29/00; C08L29/02; C08L29/04; C08L61/00; C08L61/20; D01F6/44; D01F6/50; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/298
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
A flame retardant fiber capable of being crosslinked comprising about 80-5% by weight of polyvinyl alcohol having a degree of hydrolysis (mol %) between about 85 and 99.4 and about 20-95% by weight of an amino resin condensate having at least 50% methylene groups, whereby only a small amount of reactive hydroxy methyl groups are present in said amino resin, based on the formulation: ##EQU2## wherein Me represents the methylene groups, said amino resin being the condensate of formaldehyde and an amino compound selected from the group consisting of melamine, cyclohexyl melamine, guanamine, benzoguanamine, acetoguanamine, urea, methylurea and mixtures thereof, in the presence of an acid catalyst.
Claim 2
Dependent Claim
107 words
A flame retardant fiber capable of being crosslinked comprising about 80-5% by weight of polyvinyl alcohol having a degree of hydrolysis (mol %) between about 85 and 99.4 and about 20-95% by weight of an amino resin condensate having at least 50% methylene groups, whereby only a small amount of reactive hydroxy methyl groups are present in said amino resin, based on the formulation: ##EQU2## wherein Me represents the methylene groups, said amino resin being the condensate of formaldehyde and an amino compound selected from the group consisting of melamine, cyclohexyl melamine, guanamine, benzoguanamine, acetoguanamine, urea, methylurea and mixtures thereof, in the presence of an acid catalyst.
Claim 3
Dependent Claim
27 words
A flame retardant fiber in accordance with claim 1, wherein the molar ratio (F/A) of formaldehyde (F) to the amino compound (A) of the resin is 0.7-1.5.
Claim 4
Dependent Claim
33 words
A flame retardant fiber in accordance with claim 1, wherein the methylene percentage based on the sum of hydroxymethyl groups and methylene groups in the amino resin condensate is more than about 70%.
Claim 5
Dependent Claim
29 words
A flame retardant fiber in accordance with claim 1 including condensate reaction products of formaldehyde and monomers selected from the group consisting of sulfamide, guanidine, aniline, phenol and xylene.
Claim 6
Dependent Claim
32 words
A flame retardant fiber as recited in claim 1 wherein said catalyst is an acid selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, oxalic acid, and formic acid.
Claim 7
Dependent Claim
16 words
A flame retardant fiber as recited in claim 1 wherein said catalyst is a Lewis acid.
Claim 8
Dependent Claim
16 words
A flame retardant fiber as recited in claim 1 wherein said catalyst is a sulfonic acid.
Claim 9
Dependent Claim
15 words
A flame retardant fiber as recited in claim 5 wherein said catalyst comprises hydrochloric acid.
Claim 10
Dependent Claim
15 words
A flame retardant fiber as recited in claim 5 wherein said catalyst comprises sulfuric acid.
Claim 11
Dependent Claim
15 words
A flame retardant fiber as recited in claim 5 wherein said catalyst comprises phosphoric acid.
Claim 12
Dependent Claim
32 words
A flame retardant fiber as recited in claim 1 wherein the methylene percentage based on the sum of hydroxylmethyl groups and methylene groups in said amino resin condensate is at least 80%.
Claim 13
Dependent Claim
32 words
A flame retardant fiber as recited in claim 1 wherein the methylene percentage based on the sum of hydroxymethyl groups and methylene groups in said amino resin condensate is at least 90%.
Claim 14
Dependent Claim
21 words
A flame-retardant fiber in accordance with claim 1 in which the fiber is cured and contains an increase in methylene linkages.
Claim 15
Dependent Claim
25 words
A flame-retardant fiber in accordance with claim 13 having a tensile strength of at least 1.0 g/d and a break elongation of at least 5%.
Claim 16
Dependent Claim
19 words
A flame retardant fiber as recited in claim 14 having an elasticity modulus of at least about 40 g/d.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |