Abstract A process for coronizing glass fabric or fibers to remove sizing and/or other thermally sensitive material therefrom and to whiten the glass fabric or fibers is disclosed, wherein the glass fabric or fibers are contacted with at least 0.02 percent by weight of at least one alkali metal azide salt, the thus-treated glass is heated to a temperature of 900* - 1,300* F, producing a cleaned glass fabric or fibers having improved cleanliness and/or tensile properties, compared to similar products treated in the same way but in the absence of the azide salt. The cleaned glass fabric or fibers may be coronized without drying same, while still retaining a substantial amount of the tensile properties thereof, which is a substantial improvement over prior art processes which generally require an intermediate drying step.
Inventors
👤 J Johnson
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-30 05:07
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
31 words
The process as claimed in claim 1, wherein glass is contacted with about 0.05 to about 2.0 percent by weight, based on the weight of said glass, of said azide salt.
Claim 2
Dependent Claim
25 words
The process as claimed in claim 2, wherein said glass is contacted with about 0.05 to about 0.1 percent by weight of said azide salt.
Claim 3
Dependent Claim
22 words
The process as claimed in claim 3, wherein said glass is contacted with about 0.1 percent by weight of said azide salt.
Claim 4
Dependent Claim
14 words
The process as claimed in claim 1, wherein said fibrous glass is glass fabric.
Claim 5
Dependent Claim
13 words
Th process as The in claim 1 wherein said salt is sodium azide.
Claim 6
Dependent Claim
17 words
The process as claimed in claim 5, wherein the treated glass fabric is heated without drying same.
Claim 7
Dependent Claim
29 words
The process as claimed in claim 5, wherein said fabric is dried to remove substantially all moisture therefrom after treatment with said azide salt and before said heating step.
Claim 8
Dependent Claim
35 words
The process as claimed in claim 1, wherein said glass is contacted with an aqueous solution of said azide salt, and thereafter is heated to said temperature without drying same prior to said heating step.