Title:
改善された貯蔵安定性をもつ高固形分ポリウレタン-尿素分散液
Document Type and Number:
Japanese Patent JP4620196
Kind Code:
B2
Abstract:
An aqueous polyurethane dispersion is prepared by 65-95 wt.% neutralization of the acid groups prior to polymerization and neutralization to at least 115 wt.% after polymerization. An aqueous polyurethane dispersion (I) is the reaction product of (A) a difunctional polyol having a mol.wt. of 500-600 (B) a difunctional, low mol. wt. alcohol (C) a di- and/or trifunctional isocyanate (D) a compound having an acid group and 1-2 hydroxy- and/or amine groups to achieve an acid number of 12-27 mg KOH/g (w.r.t. solids) whereby prior to dispersion a neutralizing agent for 65-95% of the acid groups is added with addition of further neutralization agent (to at least 115% of carboxylic acid group content) following the termination of chain extending reactions to yield a product containing 1.0-4.0% (w.r.t. 100% solids) of an isolated urea structure as shown in the square brackets of formula (1). Independent claims are included for (i) a process for the production of the dispersion (I) by mixing (A), (B), (C) and (D) to form a pre-polymer followed by addition of a neutralization agent to neutralize 65-95% of acid groups, dispersion in water, carrying out a chain extending reaction in water, addition of further neutralization agent (to at least neutralization of 115% of the carboxylic groups, optionally at least partial distillation of solvent to form at least a 35 wt.% polyurethane dispersion having a pH of 7.5 and containing 1.0-4.0 wt.% (w.r.t. solids) of isolated urea structural units of formula (1); and (ii) an aqueous coating system that is readily cleaned and contains the dispersion (I).
Inventors:
Harald Bloom
Vieland Hove Estat
Lotar curl
Douglas A. Wicks
Vieland Hove Estat
Lotar curl
Douglas A. Wicks
Application Number:
JP15219699A
Publication Date:
January 26, 2011
Filing Date:
May 31, 1999
Export Citation:
Assignee:
Bayer Aktiengesellschaft
International Classes:
C08G18/10; C08J3/07; C08G18/00; C08G18/08; C08G18/12; C08G18/32; C08G18/75; C09D175/00; C09D175/04; C09D175/06
Domestic Patent References:
| JP9165429A | ||||
| JP9241347A | ||||
| JP9100332A | ||||
| JP5155965A |
Attorney, Agent or Firm:
Aoyama Aoi
Yasuo Shibata
Yasuo Shibata