Formaldehyde → HCID 86736650, compound
Reaction equation
[Si:1]([OH:5])([OH:4])([OH:3])[OH:2].[NH2:6][C:7]([NH2:9])=[S:8].[CH2:10]=[O:11]>>[NH2:6][C:7]([NH2:9])=[S:8].[Si:1]([OH:5])([OH:4])([OH:3])[OH:2].[NH2:6][C:7]([NH2:9])=[S:8].[CH2:10]=[O:11]Participants
Procedure
The silicoformic acid, polysilicoformic acid and metasilicic acid as produced in Example IX are mixed with 30 parts by weight of thiourea, heated to 70° to 150° C., while agitating, for 15 to 90 minutes, thereby producing white granules of thiourea silicoformate and thiourea silicate. The said thiourea silicate and silicoformate are added to 100 parts by weight of 37% aqueous solution of formaldehyde, heated to 70° to 90° C. and the solution becomes clear. The said solution is filtered and about 10% to 20% of the silicic acid is filtered off. Dilute sulfuric acid is added to said solution until the pH is 4 to 5, and then heated to 70° to 90° C., while agitating, for 20 to 30 minutes, or until the desired viscosity is obtained. The resin is, at first, clear, then, as the viscosity increases, it becomes white, thereby producing poly (formaldehyde thiourea silicate thiourea silicoformate) resin. The said resin is soluble in acetic acid and forms a clear solution. The said white resin has a softening point of 40° to 50° C., depending on its viscosity while heating, and may be molded into useful objects or used as a protective coating agent.
Workup
- temperatureheated to 70° to 90° C.
- filtrationThe said solution is filtered
- filtrationabout 10% to 20% of the silicic acid is filtered off
- additionDilute sulfuric acid is added
- temperatureheated to 70° to 90° C.
- customuntil the desired viscosity is obtained
- temperatureat first, clear, then, as the viscosity increases
Sources & evidence
- ORD record
- ord-a9f8397bfc954714a3e1c8cc634997cf
- Source dataset
- uspto-grants-1979_10
- Patent number
- US04169930
Reaction notes
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