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US 2017/0334839 A1Published application
Novel carbodiimides, method for the production and use thereof
AssigneeLANXESS Deutschland GmbH
InventorsWilhelm LAUFER, Volker WENZEL
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Abstract
The invention relates to novel carbodiimides having terminal urea and/or urethane groups, to processes for the production thereof and to the use thereof as a stabilizer in ester-based polymers especially in films for protection from hydrolytic degradation.
Claims20
A carbodiimide of formula (I) having terminal urea and/or urethane groups
- wherein:
- each R may be identical or different and is selected from the group of —NHCONHRI, —NHCONRIRII and —NHCOORIII radicals, wherein
- RI and RII are identical or different and represent a C1-C22-alkyl, C6-C12-cycloalkyl, C6-C18-aryl, or C7-C18-aralkyl radical, and
- RIII represents a C1-C22-alkyl, C6-C12-cyctoalkyl, C6-C18-aryl, C7-C18-aralkyl radical, an unsaturated alkyl radical having 2-22 carbon atoms, or an alkoxypolyoxyalkylene radical, and
- n=0 to 20.
2 more elements
A process for producing the carbodiimides as claimed in clam 1, the process comprising:
- end-functionalizing a portion of free NCO groups of aromatic diisocyanates of formula (II)
- with primary or secondary amines and/or alcohols and/or alkoxypolyoxyalkylene alcohols, and
- subsequently, carbodiimidizing to eliminate carbon dioxide at temperatures of 80° C. to 200° C. in the presence of catalysts and optionally solvent.
Dependencies are inferred from the claim text.