EP0186128A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Silica-rich, porous and nonporous 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 and nonporous, alkaline tolerant, solid silica-rich fibers are produced from forming glass fibers of an aluminum borosilicate composition having extractable components and nonextractable components comprising silica and one or more metal oxides from a metal of Group IV of the Periodic Chart, and extracting the extractable components with or without heat treating the glass fibers. The nonporous silica-rich fibers are produced from the porous silica-rich fibers by reconsolidated through heat treatment to shrink the pores.
Inventors
- 👤 Richard Paul Beaver
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/66; C03C25/68; C03C13/00; C03C13/005
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
142 words
Process for producing an alkaline tolerant, porous solid, silica-rich fiber with controlled porosity, with aluminum borosilicate glass fibers, characterized by: a. forming glass fibers of a glass composition of aluminum borosilicate having one or more oxides of a metal from Group IV of the Periodic Chart, wherein in weight percent the glass composition has: boron-containing material from around 5 to around 60, aluminum oxide from around 0.1 to about 18, at least one oxide of a metal from Group IV of the Periodic Table about 1 to about 20 alkali metal oxide from 0 to about 15, alkaline earth metal oxides from 0 to about 30, and silica from at least about 25 to about 80; b. extracting the extractable components including associated aluminum oxide from the fibers to produce porous silica-rich fibers containing at least one oxide of Group IV metals.
Claim 2
Dependent Claim
142 words
Process for producing an alkaline tolerant, porous solid, silica-rich fiber with controlled porosity, with aluminum borosilicate glass fibers, characterized by: a. forming glass fibers of a glass composition of aluminum borosilicate having one or more oxides of a metal from Group IV of the Periodic Chart, wherein in weight percent the glass composition has: boron-containing material from around 5 to around 60, aluminum oxide from around 0.1 to about 18, at least one oxide of a metal from Group IV of the Periodic Table about 1 to about 20 alkali metal oxide from 0 to about 15, alkaline earth metal oxides from 0 to about 30, and silica from at least about 25 to about 80; b. extracting the extractable components including associated aluminum oxide from the fibers to produce porous silica-rich fibers containing at least one oxide of Group IV metals.
Claim 3
Dependent Claim
45 words
Process of Claim 1, wherein extracting involves acid leaching the glass fibers in a acid solution, where the acid is other than hydrofluoric acid or phosphoric acid, and where the percentage of extractable components in the glass fibers is greater than around 20 weight percent.
Claim 4
Dependent Claim
34 words
Process of Claim 1, 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 5
Dependent Claim
37 words
Process of Claim 1, 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 aluminum oxide.
Claim 6
Dependent Claim
38 words
Process of Claim 1, 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 7
Dependent Claim
22 words
Process of Claims 1-5, wherein the glass fibers have a filament diameter of greater than 25 microns to less than 250 microns.
Claim 8
Dependent Claim
27 words
Process of Claims 1, 2-3, wherein the glass fibers have an amount of boron-containing material greater than 40 weight percent and are heat treated at lower temperatures.
Claim 9
Dependent Claim
41 words
Process of Claims 1-17, wherein forming includes attenuating the fibers from orifices in a bushing, contacting the fibers with an aqueous chemical treating composition, gathering the fibers into one or more strands and winding the strands into a cylindrical multilayered package.
Claim 10
Dependent Claim
23 words
Process of Claims 1-8, wherein the porous glass fibers have a pore volume in the range of about 0.2 to about 1.2 cc/gm.
Claim 11
Dependent Claim
24 words
Process of Claims 1-9, wherein the porous, silica-rich fibers have a length from less than 1/8 of an inch (0.3 cm) to continuous lengths.
Claim 12
Dependent Claim
22 words
Process of Claim 1, wherein the amount of silica in the glass fibers before extraction ranges from 30 to 70 weight percent.
Claim 13
Dependent Claim
148 words
Process of Claims 6, 8-10, wherein: a. glass fibers are formed to have a glass composition of aluminum borosilicate, having a tetravalent oxide of a metal from Group IV of the Periodical chart, comprising: a) bpron-containing material from around 5 to around 60, b) aluminum oxide from around 0.1 to about 15, c) tetravalent oxide of a metal from Group IV of the Periodic Table about 1 to about 20, d) alkali metal oxide from 0 to about 15, . e) alkaline earth metal oxides from about 0 to about 30, and f) silica from at least about 25 to around 80, b. the glass fibers are leached to remove water and/or acid extractable components including associated aluminum oxide from the fibers to produce porous silica-rich fibers with an oxide of a metal from Group IV of the Periodic Chart to provide alkaline tolerant fibers with controlled porosity.
Claim 14
Dependent Claim
132 words
Process of Claims 1, 6, 8-10, wherein: a. glass fibers are formed to have 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 Table from about 1 to about 20, d) alkaline earth metal oxides from 16 to 25, and e) silica from 52 to 56, b. the glass fibers are leached with acid to extract the acid extractable components including associated aluminum oxide from the fibers to produce porous, silica-rich fibers containing a metal from Group IV of the Periodic Table.
Claim 15
Dependent Claim
34 words
Process of Claims 1-13, which includes heating the porous, silica-rich fibers to reconsolidate the fibers to produce solid, nonporous silica-rich fibers having oxides at least one metal of Group IV of the Periodic Table.
Claim 16
Dependent Claim
8 words
Product produced from the processes of Claims 1-14.
Claim 17
Dependent Claim
78 words
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 are formed by reconsolidating porous, silica-rich fibers by heating wherein the porous silica-rich fibers are produced by acid 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 18
Dependent Claim
78 words
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 are formed by reconsolidating porous, silica-rich fibers by heating wherein the porous silica-rich fibers are produced by acid 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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