Title:
PROCESS FOR THE PREPARATION OF A MODIFIED AMINO-FORMALDEHYDE RESIN; MODIFIED AMINO-FORMALDEHYDE RESIN THUS OBTAINABLE, AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO2006065123
Kind Code:
A8
Abstract:
The invention relates to a process for the preparation of a modified amino-formaldehyde resin, comprising: a) a mixing step, in which a liquid phase, an amino-formaldehyde resin and free formaldehyde are brought together to form a mixture, whereby the amino- formaldehyde resin has a molar formaldehyde to (NH2)2 ratio (F/(NH2)2 ratio) lying between 0.5 and 3 and has a weight average molecular weight lying between 500 and 50,000, and whereby the overall molar F/(NH2)2 ratio in the mixture is higher than the molar F/(NH2)2 ratio of the amino-formaldehyde resin and lies between 2 and 6; b) an F-binding step, in which the mixture is brought to conditions whereby at least part of the free formaldehyde reacts with the amino-formaldehyde resin to form a formaldehyde-enriched amino-formaldehyde resin, such that the F/(NH2)2 ratio of the formaldehyde-enriched amino-formaldehyde resin is at least 1 higher than that of the amino-formaldehyde resin; c) an alkylation step, in which an alcohol and an acid having a pKa lower than 6 are added to the mixture, the mixture then being brought to conditions whereby at least part of the alcohol reacts with the formaldehyde-enriched amino-formaldehyde resin to form the modified amino-formaldehyde resin, whereby steps a) and b) may be executed either consecutively or simultaneously, The invention further relates to a modified amino-formaldehyde resin, obtainable by the said process, as well as to use of the said resin, in particular in coating compositions.
Inventors:
KEIJZER DE AUGUSTINUS EUGENE H (NL)
HAAS DE JACOB LEENDERT (NL)
DIJCK VAN MICHAEL ALPHONSUS CO (BE)
BENTHEM VAN RODOLFUS ANTONIUS (NL)
NUSSELDER JAN JACOB HENDRIK (NL)
HAAS DE JACOB LEENDERT (NL)
DIJCK VAN MICHAEL ALPHONSUS CO (BE)
BENTHEM VAN RODOLFUS ANTONIUS (NL)
NUSSELDER JAN JACOB HENDRIK (NL)
Application Number:
PCT/NL2005/000866
Publication Date:
August 16, 2007
Filing Date:
December 15, 2005
Export Citation:
Assignee:
DSM IP ASSETS BV (NL)
KEIJZER DE AUGUSTINUS EUGENE H (NL)
HAAS DE JACOB LEENDERT (NL)
DIJCK VAN MICHAEL ALPHONSUS CO (BE)
BENTHEM VAN RODOLFUS ANTONIUS (NL)
NUSSELDER JAN JACOB HENDRIK (NL)
KEIJZER DE AUGUSTINUS EUGENE H (NL)
HAAS DE JACOB LEENDERT (NL)
DIJCK VAN MICHAEL ALPHONSUS CO (BE)
BENTHEM VAN RODOLFUS ANTONIUS (NL)
NUSSELDER JAN JACOB HENDRIK (NL)
International Classes:
C08G12/42
Download PDF: