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US 2025/0075023 A1Published application
Polymeric carbodiimides, processes for the preparation and use thereof
AssigneeLANXESS Deutschland GmbH
InventorWilhelm Laufer
Life of this patent
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Abstract
The invention relates to novel polycarbodiimides which are capable of easy and reliable production, have high average molar masses and effect excellent hydrolysis stabilization, to processes for the production thereof and to the use thereof.
Claims22
A polycarbodiimide of formula (I)
- in which
- the radicals R may be identical or different and are selected from NCN—RI, wherein the radicals RI represent C1-C22-alkyl, unsubstituted or C1-C12-alkyl-substituted C6-C12-cycloalkyl, unsubstituted or C1-C12-alkyl-substituted C6-C13-aryl or unsubstituted or C1-C12-alkyl-substituted C5-C18-aralkyl and
- R1, R2 and R3 in each case identically or independently of one another represent methyl, ethyl, i-propyl- or n-propyl, n-butyl or i-butyl or t-butyl and
- n is from 20 to 500,
- wherein the average molar mass Mw is more than 10000 and the proportion of polycarbodiimide having a molar mass of 30,000 g/mol or more is less than 20% by weight.
2 more elements
A process for producing polycarbodiimides of formula (I)
- by reaction of diisocyanates of formula (II)
- and monoisocyanates of formula RI—NCO,
- wherein the radicals R may be identical or different and are selected from NCN—RI, wherein the radicals RI represent C1-C22-alkyl, unsubstituted or C1-C12-alkyl-substituted C6-C12-cycloalkyl, unsubstituted or C1-C12-alkyl-substituted C6-C12-aryl or unsubstituted or C1-C12-alkyl-substituted C1-C18-aralkyl and
- R1, R2 and R3 in each case identically or independently of one another represent methyl, ethyl, i-propyl- or n-propyl, n-butyl or i-butyl or t-butyl and
- n is from 20 to 500, at temperatures of 80° C. to 200° C. in the presence of catalysts and optionally solvent to eliminate carbon dioxide,
- wherein the mass ratio of diisocyanates to monoisocyanates is from 20:1 to 100:1.
3 more elements
(canceled)
(canceled)
Dependencies are inferred from the claim text.