| 摘要 |
The invention relates to water-soluble or water-dispersible, hydrophilic polyisocyanates and polyisocyanate mixtures, to a process for preparing them, and to their use as a starting component in the production of polyurethane polymers, more particularly as crosslinkers for water-soluble or water-dispersible film-forming binders, adhesives binders, or sealant binders or binder components with or without groups which are reactive towards isocyanate groups. |
| 主权项 |
1. A hydrophilic, water-soluble or water-dispersible polyisocyanate, comprising 4% to 27% by weight of isocyanate groups, said groups being aliphatically, cycloaliphatically, araliphatically and/or aromatically attached isocyanate groups,
wherein the polyisocyanate has an average functionality of 2.0 to 5.0 and is synthesized from: A) at least one diisocyanate or polyisocyanate component having an average functionality of 2.0 to 5.0 and having 8% to 27% by weight of aliphatically, cycloaliphatically, araliphatically and/or aromatically attached isocyanate groups (calculated as NCO; molecular weight=42); and B) 0.3% to 25% by weight, based on the total weight of components A) and B), of at least one emulsifier (B); wherein the emulsifier (B) is represented by formula (2):
X-G-D-H (2), wherein: X is formed from a polyalkylene glycol monoalcohol X′ which is prepared starting from an alkanol and which comprises ethylene oxide units; G denotes a structural element of the formula (3): R5 represents a saturated, unsaturated, branched or unbranched, hydrocarbon radical having at least 2 carbon atoms, wherein when w is greater than one resulting in a plurality of R5 groups being present in the formula (3), the plurality of R5 groups may be identical or different; w is greater than or equal to one; D represents an oxyethylene radical or an oxypropylene radical of the formula: —(CH2CHR6O)z—, where z is greater than or equal to 0, and R6═H or CH3; H represents hydrogen; and w is 1-20; and A) and B) are reacted with one another such that an equivalents ratio of NCO groups to functional groups which are reactive towards NCO groups of 2:1 to 400:1. |
