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US 5,847,068 AGranted
Cholesteric copolyisocyanates
AssigneeBASF SE
InventorsGeorg Maxein, Bruce M. Novak, Rudolf Zentel, Harald Keller
Life of this patent
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Abstract
Cholesteric copolyisocyanates with repeating units of the formulae: ##STR1## and, where appropriate, of the formula ##STR2## where R.sup.1 is a chiral aliphatic or aromatic radical, R.sup.2 is a crosslinkable radical, and R.sup.3 is an achiral radical, and polymers obtainable by crosslinking the copolyisocyanates according to the invention with a polymerizable solvent, and pigments comprising the polymers according to the invention, are described.
Claims23
A cholesteric copolyisocyanate with repeating units of the formulae:
- ##STR6## and, where appropriate, of the formula ##STR7## where R.sup.1 is a chiral aliphatic or aromatic radical,
- R.sup.2 is a crosslinkable radical, and
- R.sup.3 is an achiral radical.
A cholesteric polymer obtained by
- i) dissolving copolyisocyanates as claimed in any of the preceding claims in a polymerizable solvent, and
- ii) crosslinking the copolyisocyanates and solvent together.
Dependencies are inferred from the claim text.