Reaction equation
[NH2:1][C:2]([NH2:4])=[O:3].[CH2:5]=[O:6]>>[NH2:1][C:2]([NH2:4])=[O:3].[CH2:5]=[O:6].[CH2:2]=[O:3].[NH2:1][C:2]([NH2:4])=[O:3]Participants
5
Procedure
A second type of hardening compound of urea and formaldehyde which reacts well with gelatin glue is disclosed. The reaction product of urea and formaldehyde via the condensation product pathways yields a urea formaldehyde (UF) Resin which reacts with the gelatin glue as illustrated by the above described pathway. To prepare this type of compound, a mixture of urea and formaldehyde in a ratio of 1:1.7 to 1:2.4 at a pH of 8-10 is heated at approximately 80° C.-100° C. for 30 to 45 minutes. The pH is then reduced to 5 with CH3COOH and heated for another 5 to 10 minutes. The mixture is then neutralized and cooled down rapidly.
Sources & evidence
- ORD record
- ord-d8f8dc7c494646458e9e84f4100bfcd9
- Source dataset
- uspto-grants-1993_05
- Patent number
- US05210982
Linked notes
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