Process for the production of sulphonic acid group-containing condensation products with a low content of free formaldehyde
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 10, 1991
Issued Date -
N/A
app pub date -
Aug 1, 1990
filing date -
Mar 25, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for the production of sulphonic acid group-containing condensation products based on amino-s-triazines with at least two amino groups and formaldehyde with a low content of free formaldehyde, wherein a) an amino-s-triazine, formaldehyde and sulphite is condensed in a mole ratio of 1:1.3 to 6:0.3 to 1.5 in aqueous solution at a pH value of 9.0 to 12.0 and at a temperature of 50.degree. to 90.degree. C. until sulphite is no longer detectable. b) subsequently, further condensation is carried out at a pH value of 2.0 to 7.0 and at a temperature of 50.degree. to 90.degree. C. until the viscosity of the solution is 4 to 1000 mm.sup.2 /s at 80.degree. C. and c) thereafter the condensation product is subjected to an after-treatment in a strongly alkaline range of pH.sqroot.11.0 and at an elevated temperature.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully