Patent · US Expired

Urea-aldehyde polycondensates, preparation thereof and use thereof as surface coating binders

US4906727A · kind A · utility

6Cited by

3References

6Claims

0Family size

Assignee

BASF SE

Inventors

Kurt F. Fischer · Leonard, US
Harro Petersen · Bischofswerda, DE
Hellmuth Kasch · Ludwigshafen, DE
Horst Schmidt · Bad Endbach, DE

Key dates

Filing date	Dec 9, 1987
Grant date	Mar 6, 1990
Priority date	—
Expiry date	Dec 9, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09D161/24
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Urea-aldehyde polycondensates usable as surface coating binders are obtainable by step-wise reaction of PA1 (a) urea and/or urea derivatives with acidic CH aldehydes in a molar ratio of urea:aldehyde of 1:2 in the presence of acids and at from 60.degree. to 120.degree. C. with PA1 (b) a mixture of 3 moles of formaldehyde per mole or urea and 3 moles of an acidic CH aldehyde per mole of urea at from 60.degree. to 120.degree. C. with subsequent removal of the water of reaction and treatment of the reaction mixture with an alkali metal alcoholate at from 80.degree. to 100.degree. C.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.