EP0186129A2
Expired / Lapsed
EP
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Porous hollow silica-rich fibers and method of producing same
Assignee: PPG Industries Inc
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Filing: 1985-12-18
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Granted: —
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Expires: 2005-12-18
Abstract
Abstract Porous, hollow, silica-rich fibers with good alkaline tolerance are produced from hollow glass fibers of an alkali metal borosilicate glass having one or more oxides of a metal of Group IV of the Periodic Table in an amount of about 1 to about 20 weight percent of the glass composition. The hollow porous silica-rich fibers are produced by acid leaching where the hollow glass fibers have greater than 25 weight percent extractable components, less than 25 weight percent extractable components but a wall thickness of less than 15 microns, or less than 25 weight percent extractable components and a fiber diameter of less than 25 microns. In addition, heat treating can be used for hollow glass fibers having greater than 25 weight percent extractable components to enlarge the pores.
Inventors
- 👤 Richard Paul Beaver
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:27
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/66; C03C25/68; C03C13/00; C03C13/005
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
189 words
Process of producing porous, hollow, silica-rich fibers with alkaline tolerance from hollow glass fibers having extractable components, characterized by: a. forming hollow glass fibers having a glass composition of an alkali metal borosilicate and having a oxide of a metal from Group IV of the Periodic Chart having in weight percent of the glass composition: , 1. boron-containing material from 0 to around 60, 2. alkali metal oxide from around 1 to about 40, 3. oxide of a metal from Group IV of the Periodic Table about 1 to about 20, 4. aluminum oxide from 0 to about 15, 5. alkaline earth metal oxide from about 0 to about 30, 6. silica from at least about 25 to around 80, wherein an effective fluxing amount of the fluxing agent selected from the group consisting of boron-containing material or R 2 0 where R is an alkali metal is present, and wherein the hollow glass fibers having a K factor of up to around 0.96, b. extracting the extractable components from the fibers to produce the porous, hollow, silica-rich fibers containing at least one oxide of the Group IV metals.
Claim 2
Dependent Claim
189 words
Process of producing porous, hollow, silica-rich fibers with alkaline tolerance from hollow glass fibers having extractable components, characterized by: a. forming hollow glass fibers having a glass composition of an alkali metal borosilicate and having a oxide of a metal from Group IV of the Periodic Chart having in weight percent of the glass composition: , 1. boron-containing material from 0 to around 60, 2. alkali metal oxide from around 1 to about 40, 3. oxide of a metal from Group IV of the Periodic Table about 1 to about 20, 4. aluminum oxide from 0 to about 15, 5. alkaline earth metal oxide from about 0 to about 30, 6. silica from at least about 25 to around 80, wherein an effective fluxing amount of the fluxing agent selected from the group consisting of boron-containing material or R 2 0 where R is an alkali metal is present, and wherein the hollow glass fibers having a K factor of up to around 0.96, b. extracting the extractable components from the fibers to produce the porous, hollow, silica-rich fibers containing at least one oxide of the Group IV metals.
Claim 3
Dependent Claim
30 words
Process of Claim 1, wherein the glass fibers are formed to have a composition of 29 weight percent sodium oxide, 62 weight percent silica, and 9 weight percent zirconium oxide.
Claim 4
Dependent Claim
84 words
Process of Claims 1-2, wherein extracting is without heat treating and involves acid leaching the glass fibers in an acid solution, where the acid is other than hydrofluoric acid or phosphoric acid, for formed hollow glass fibers selected from the group consisting of hollow fibers, where the percentage of extractable components in the glass fibers is greater than around 20 weight percent and hollow glass fibers having less than 25 weight percent extractable components and having a wall thickness of less than 15 microns.
Claim 5
Dependent Claim
34 words
Process of Claims 1-2, wherein extracting includes heat treating the glass fibers to phase separate the extractable components from the nonextractable components and leaching the phase separated extractable components by water and/or acid leaching.
Claim 6
Dependent Claim
37 words
Process of Claims 1-4, wherein the glass fibers have a composition of 27 weight percent boric oxide, 8 weight percent sodium oxide, 60 weight percent silica, 3.6 weight percent zirconium oxide, and 1.4 weight percent alumium oxide.
Claim 7
Dependent Claim
38 words
Process of Claims 1-4, wherein the glass composition has 7.2 weight percent boric oxide, 54 weight percent silica, 22.4 weight percent calcium oxide, 10.7 weight percent aluminum oxide, 3.6 weight percent zirconium oxide and 0.7 weight percent fluorine.
Claim 8
Dependent Claim
22 words
Process of Claims 1-6, wherein the glass fibers have a filament diameter of greater than 25 microns to less than 250 microns.
Claim 9
Dependent Claim
28 words
Process of Claims 1-4 and 7, wherein the glass fibers having an amount of boron-containing material greater than 40 weight percent and are heat treated at lower temperatures.
Claim 10
Dependent Claim
44 words
Process of Claims 1-8, wherein forming includes attenuating the fibers from orifices in a bushing, contacting the fibers with an aqueous chemical treating composition, gathering the fibers into at least one strand and winding the at least one strand into a cylindrical multilayered package.
Claim 11
Dependent Claim
23 words
Process of Claims 1-9, wherein the porous glass fibers have a pore volume in the range of about 0.2 to about 1.2 cc/gm.
Claim 12
Dependent Claim
25 words
Process of Claims 1-10, wherein the porous, hollow, silica-rich fibers have a length from less than 1/8 of an inch (0.3 cm) to continuous lengths.
Claim 13
Dependent Claim
24 words
Process of Claims 1, 3-11, wherein the amount of silica in the hollow glass fibers before extraction range from 30 to 70 weight percent.
Claim 14
Dependent Claim
156 words
Process of Claims 1, 4, 7, 9-11, wherein: a. hollow glass fibers are formed having a K factor of up to around 0.96 of a glass composition of alkali metal borosilicate, having a tetravalent oxide of a metal from Group IV of the Periodic Chart, comprising: 1. aluminum oxide from around 0.1 to about 15, 2. tetravalent oxide of a metal from Group IV of the Periodic Chart about 1 to about 20, - 3. alkali metal oxide from 20 to about 40, 4. alkaline earth metal oxides from about 0 to about 30, and 5. silica from at least about 25 to around 80, and b. the hollow glass fibers are leached of water and/or acid extractable components including any associated aluminum oxide from the fibers to produce porous, hollow silica-rich fibers with metal oxide of a metal from Group IV of the Periodic Chart, where the fibers are alkaline tolerant and have controlled porosity.
Claim 15
Dependent Claim
155 words
Process of Claim 13, wherein: a. hollow glass fibers are formed having a K factor up to around 0.96 of a glass composition of aluminum borosilicate, having a tetravalent oxide of a metal from Group IV of the Periodic Chart having in weight percent, comprising: a) boron-containing material from around 8 to 13, b) aluminum oxide from around 12 to 16, c) tetravalent oxide of a metal from Group IV of a metal from Group IV of the Periodic Chart from about 1 to about 20, d) alkaline earth metal oxides from 16 to 25, and e) silica from 52 to 56, b. the hollow glass fibers are leached with acid to extract the acid extractable components including any associated aluminum oxide from the fibers to produce porous, hollow silica-rich fibers with a metal oxide of a metal from Group IV of the Periodic Chart, where the fibers are alkaline tolerant and have controlled porosity.
Claim 16
Dependent Claim
35 words
Process of Claim 13-14, which includes heating the porous, silica-rich fibers to reconsolidate the fibers to produce solid, nonporous, silica-rich fibers having oxides from one or more metals of Group IV of the Periodic Chart.
Claim 17
Dependent Claim
11 words
Porous, hollow, silica-rich fibers produced by the process of Claims 1-15.
Claim 18
Dependent Claim
79 words
Hollow, porous silica-rich fibers with alkaline tolerance having silica in an amount from around 75 weight percent to 99 weight percent with the balance being zirconium oxide, wherein the fibers have a K factor of up to 0.9, wherein the porous silica-rich fibers are produced by water leaching glass fibers having a composition of 27 weight percent boric oxide, 8 weight percent sodium oxide, 60 weight percent silica, 3.6 weight percent zirconium oxide and 1.4 weight percent aluminum oxide.
Claim 19
Dependent Claim
79 words
Hollow, porous silica-rich fibers with alkaline tolerance having silica in an amount from around 75 weight percent to 99 weight percent with the balance being zirconium oxide, wherein the fibers have a K factor of up to 0.9, wherein the porous silica-rich fibers are produced by water leaching glass fibers having a composition of 27 weight percent boric oxide, 8 weight percent sodium oxide, 60 weight percent silica, 3.6 weight percent zirconium oxide and 1.4 weight percent aluminum oxide.
References Cited (Backward Citations)
No citation records indexed.
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