Abstract: The invention provides an improved process for preparing diamines and polyamines from the diphenylmethane series by reacting aniline and formaldehyde in the presence of an acid catalyst, the improvement involving the aniline containing less than about 3 wt. % of diamines and polyamines from the diphenylmethane series, based on the weight of the aniline.
Type:
Grant
Filed:
January 24, 2007
Date of Patent:
May 5, 2009
Assignee:
Bayer MeterialScience AG
Inventors:
Fritz Pohl, Jeffrey Bolton, Richard Adamson, Heinz-Herbert Muller, Rudolf Uchdorf
Abstract: Process for preparing binders including reacting A) one or more NCO-functional compounds containing uretdione groups with B) one or more compounds containing groups capable of participating in polymerization reaction with ethylenically unsaturated compounds on exposure to actinic radiation, and contain isocyanate-reactive groups, followed by C) reaction with one or more hydroxyl-containing compounds other than B), wherein at least one of these compounds has an OH functionality of?2, D) in the presence of one or more compounds containing phenoxide groups, as catalysts, and E) optionally auxiliaries and additives, where the reaction with compounds of component C) proceeds at least proportionally with the formation of allophanate groups and where and including binders containing allophanate groups and groups capable of participating in a polymerization reaction with ethylenically unsaturated compounds on exposure to actinic radiation, and optionally also contain NCO-reactive groups.
Type:
Grant
Filed:
March 14, 2005
Date of Patent:
June 3, 2008
Assignee:
Bayer MeterialScience AG
Inventors:
Christophe Dètrembleur, Jan Weikard, Dorota Greszta-Franz, Wolfgang Fischer, Jörg Schmitz, Holger Mundstock