Microcapsules with uv filter activity and process for producing them
OwnerKatja Berg-Schultzinventor
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Abstract
The invention provides a process for producing microcapsules with UV filter activity, wherein at least one type of crosslinkable chromophore with UV-A and/or UV-B and/or UV-C filter activity and optionally at least one type of crosslinkable monomer which does not have UV-A and/or UV-B and/or UV-C filter activity are subjected to a crosslinking reaction in the absence of non-crosslinkable chromophores with UV-A and/or UV-B and/or UV-C filter activity and microcapsules obtainable by this process.
Claims25
Process for producing microcapsules with UV filter activity, wherein at least one type of crosslinkable chromophore with UV-A and/or UV-B and/or UV-C filter activity and optionally at least one type of crosslinkable monomer which does not have UV-A and/or UV-B and/or UV-C filter activity are subjected to a crosslinking reaction in the absence of non-crosslinkable chromophores with UV-A and/or UV-B and/or UV-C filter activity.
(canceled)
Crosslinkable chromophore with UV-A and/or UV-B and/or UV-C filter activity which is a monomer of the formula
- M(R)n(P)m(Q)q
- wherein
- M is a metallic or semi-metallic element,
- R is a hydrolysable group,
- Q is a non-hydrolysable group,
- n is 2 or 3, m is 1 or 2 and q is 0 or 1, and wherein n+m+q=4 and P is a chromophore with UV-A, UV-B and/or UV-C filter activity with the general formula A—(B)b(C)c(D)d(E)e— which is chemically bonded to M
- wherein
- A is a chromophore with UV-A and/or UV-B filter activity and —(B)b(C)c(D)d(E)e— is a spacer group in which
- B is a linear or branched alkylene group with up to 20 carbon atoms
- C is O, S or NH
- D is a CONH— group
- E is a linear or branched alkylene or alkenylene group with up to 20 carbon atoms and
- b is 0 or 1,
- c is 0 or 1,
- d is 0 or 1 and
- e is 0 or 1.
Chromophore selected from the group consisting of
- wherein R′ is hydrogen, hydroxy, straight or branched chain C1-20-alkyl, -alkoxy or C2-20-alkenyl.
Dependencies are inferred from the claim text.