Patent ID: 11884571
Assignee: HERAEUS QUARZGLAS GMBH & CO. KG
Field: Other special machines (Mechanical engineering)
Classification: CPC C | IPC C

Claim 0:
1. A process for producing a fluorinated quartz glass, comprising:
(a) providing a SiO2 soot body;
(b) reacting of the SiO2 soot body with a fluorinating agent having a boiling point greater than or equal to −10° C. to obtain a fluorinated SiO2 soot body;
(c) vitrifying the fluorinated SiO2 soot body
wherein the fluorination provided in (b) is carried out with a fluorinating agent selected from a group consisting of:
i. oxygen-containing fluorinating agents;
ii. nitrile-containing fluorinating agents;
iii. mixtures of oxygen-containing and nitrile-containing fluorinating agents; and
characterized in that the oxygen-containing fluorinating agents are selected from a group consisting of:
i. Perfluoroketones of the general formula (I)

RF1—CO—RF2  (I),

wherein RF1 is selected from a group consisting of perfluorinated carbon groups having 1 to 7 carbon atoms and fluorine; and RF2 is selected from a group consisting of perfluorinated carbon groups having 1 to 7 carbon atoms;
ii. Perfluoroethers of general formula (II)

RF1—C(X1)(X2)O—RF2  (II),

wherein RF1 is selected from the group consisting of perfluorinated carbon groups having 1 to 7 carbon atoms and fluorine; RF2 is selected from the group consisting of perfluorinated carbon groups having 1 to 7 carbon atoms; and X1 and X2 are fluorine or CF3;
iii. Hydrofluoroethers of the general formula (III)

RF1—C(X1)(X2)O—R2  (III),

wherein RF1 is selected from the group consisting of perfluorinated carbon groups having 1 to 7 carbon atoms and fluorine, R2 is a non-fluorinated hydrocarbon group having 1 to 3 carbon atoms; and X1 and X2 are fluorine or CF3.