US4030938A
Expired / Lapsed
US
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Method for the manufacture of borosilicate glasses
Assignee: OI Glass Inc
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Filing: 1976-02-03
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Granted: 1977-06-21
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Expires: 1996-02-03
Abstract
Abstract A process is provided for producing carbon free borosilicate glass compositions by hydrolyzing a silicon tetraalkoxide so as to form an at least partially hydrolyzed silicon tetraalkoxide which is then combined with a boron alkoxide and sufficient water to produce a substantially hydrolyzed borosiloxane, or borosilicate precursor, and then this precursor in the presence of free water is fractionally distilled for a time sufficient to remove all alkanol by-product.
Inventors
- 👤 Ian M. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
49 words
A process for producing an amorphous carbon free, homogeneous borosilicate product comprising a. combining a boron alkoxide and an at least partially hydrolyzed silicon tetraalkoxide b. fractionally distilling the product of step (a) in the presence of free water for a time sufficient to remove all alkanol by product.
Claim 2
Dependent Claim
49 words
A process for producing an amorphous carbon free, homogeneous borosilicate product comprising a. combining a boron alkoxide and an at least partially hydrolyzed silicon tetraalkoxide b. fractionally distilling the product of step (a) in the presence of free water for a time sufficient to remove all alkanol by product.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein said at least partially hydrolyzed silicon tetraalkoxide is the reaction product of a silicon alkoxide and an excess of a stoichiometric quantity of water.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said silicon tetraalkoxide is tetraethoxy silane.
Claim 5
Dependent Claim
69 words
A process for producing an amorphous, carbon free borosilicate product comprising a. combining water, a silicon tetraalkoxide and a boron alkoxide, the total amount of water being in excess of the theoretical amount required for hydrolysis, so as to form a hydrolysis product b. concentrating the hydrolysis product c. fractionally distilling the concentrated hydrolysis product in the presence of free water to a fractionating column-head temperature of 100° C.
Claim 6
Dependent Claim
69 words
A process for producing an amorphous, carbon free borosilicate product comprising a. combining water, a silicon tetraalkoxide and a boron alkoxide, the total amount of water being in excess of the theoretical amount required for hydrolysis, so as to form a hydrolysis product b. concentrating the hydrolysis product c. fractionally distilling the concentrated hydrolysis product in the presence of free water to a fractionating column-head temperature of 100° C.
Claim 7
Dependent Claim
89 words
A process for producing an amorphous carbon free borosilicate product comprising a. combining water, a silicon tetraalkoxide and a boron alkoxide, the total amount of water being in excess of the theoretical amount required for hydrolysis, so as to form a hydrolysis product b. concentrating the hydrolysis product to form a gel c. drying the gel d. combining an additional quantity of water with the dried gel and fractionally distilling said combination of water and gel with a fractionating column for a time sufficient to hydrolyze residual alkoxy groups.
Claim 8
Dependent Claim
89 words
A process for producing an amorphous carbon free borosilicate product comprising a. combining water, a silicon tetraalkoxide and a boron alkoxide, the total amount of water being in excess of the theoretical amount required for hydrolysis, so as to form a hydrolysis product b. concentrating the hydrolysis product to form a gel c. drying the gel d. combining an additional quantity of water with the dried gel and fractionally distilling said combination of water and gel with a fractionating column for a time sufficient to hydrolyze residual alkoxy groups.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |