US4332601A
Expired / Lapsed
US
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Method for making silica fibers
Assignee: Ema Corp
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Filing: 1980-06-23
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Granted: 1982-06-01
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Expires: 2000-06-23
Abstract
Abstract Process for the production of water containing water glass fibers of the type in which alkali water glass is dry spun into water containing fibers, the improvement being dry-spinning water glass free from non-alkaline compounds having a molar ratio of alkaline oxide to silicon dioxide of from about 1:3 to 1:1.9 and a viscosity of about 10-700 Pa measured at 30 DEG C., at 10 DEG -50 DEG C. in a drying funnel of a temperature of more than 100 DEG C., at a discharge velocity of minimum 5m/min.
Inventors
- 👤 Arno Wegerhoff
- 👤 Hans Zengel
- 👤 Walter Brodowski
- 👤 Heinz Beck
- 👤 Ernst Seeberger
- 👤 Gerhard Steenken
- 👤 Karlheinz Hillermeider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:50
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/03; B; B01; B01D; B01D39/00; B01D39/02; B01D39/06; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; C03B37/011; C03C; C03C13/00; C03C13/005; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6224; D; D01; D01F; D01F9/00; D01F9/08; F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; F16D2200/00; F16D2200/006; F16D2200/0065; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/298; Y10T442/00; Y10T442/60; Y10T442/696
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
In a process for the production of water-containing water glass fibers of the type in which alkali water glass is dry spun into water-containing fibers, the improvement comprising dry-spinning water glass free from non-alkaline compounds, having a molar ratio of alkaline oxide to silicon dioxide of from about 1:3 to 1:1.9 and a viscosity of about 10 to 700 Pa measured at 30° C., at about 10° to 50° C. in a drying funnel of a temperature of more than 100° C., at a discharge velocity of minimum 5 m/min.
Claim 2
Dependent Claim
90 words
In a process for the production of water-containing water glass fibers of the type in which alkali water glass is dry spun into water-containing fibers, the improvement comprising dry-spinning water glass free from non-alkaline compounds, having a molar ratio of alkaline oxide to silicon dioxide of from about 1:3 to 1:1.9 and a viscosity of about 10 to 700 Pa measured at 30° C., at about 10° to 50° C. in a drying funnel of a temperature of more than 100° C., at a discharge velocity of minimum 5 m/min.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein the alkaline oxide is a mixture comprising from about 70 to 100 molar percent of sodium oxide and from about 0 to 30 molar percent of potassium oxide.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the alkaline oxide is sodium oxide.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the water glass fibers have a water content of from about 15 to 30 weight percent.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the spinning material is at a temperature of from about 20° C. to 35° C.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein the spinning material has a viscosity of from about 100 Pa.s to 400 Pa.s measured at 30° C.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein the water glass fibers have a water content of from about 20 to 50 weight percent.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein the water glass fibers have a tear strength of from about 5 to 30 c N /tex.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein the alkali water glass is an aqueous alkaline silicate solution having a visocity of from about 10 tl 700 Pa.s determined at 30° C.
Claim 11
Dependent Claim
78 words
The method of claim 1 wherein said dry-spinning includes jetting the alkali water glass having a temperature of from about 10° to 50° C. into a chamber filled with a gas of a temperature of more than 100° C. through jets with an exit velocity V 1 of at least about 5 m/min and drawing off the resulting fibers with a drawing off velocity V 2 providing a stretch ratio V 2 /V 1 of at least 6.
References Cited (Backward Citations)
US2338463A
Cited
US4200485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |