Heat-resistant silicone-polyurethane and a process for its synthesis
A new type heat-resistant silicone-polyurethane, which contains polysiloxane chain units of the general formula (II) with diisocyanato end groups and with polyurethane bonds in the chain -OCN-Z-NH-CO-O-X-O-CO-(NH-Z-NH-CO-O-X-O-) m -CO-NH-Z-NCO-(II) - wherein X is the molec...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A new type heat-resistant silicone-polyurethane, which contains polysiloxane chain units of the general formula (II) with diisocyanato end groups and with polyurethane bonds in the chain
-OCN-Z-NH-CO-O-X-O-CO-(NH-Z-NH-CO-O-X-O-) m -CO-NH-Z-NCO-(II)
- wherein X is the molecular fragment containing the siloxane chain, Z is the molecular fragment containing the alkyl chain, m is an integer between 1 and 20 - and/or polysiloxane chain units of the general formula (IV) with diisocyanato end groups and with polyurethane bonds in the chain
-OCN-X-NH-CO-O-Z-O-CO-(NH-X-NH-CO-O-Z-O-) m -CO-NH-X-NCO-(IV)
- wherein X is the molecular fragment containing the siloxane chain, Z is the molecular fragment containing the alkyl chain, m is an integer between 1 and 20 - as crossed-linked polymer units and a process for the synthesis of thereof. |
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