Surface functionalized titanium dioxide nanoparticles
AssigneeBASF SE
InventorsReinhold Oehrlein, Raphael Dabbous, Michelle Richert, Gabriele Baisch
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Abstract
The present invention relates to surface functionalized titanium dioxide nanoparticles, a method for its production, a coating composition, comprising the surface functionalized titanium dioxide nanoparticles and the use of the coating composition for coating holo-grams, wave guides and solar panels. Holograms are bright and visible from any angle, when printed with the coating composition, comprising the surface functionalized tita-nium dioxide nanoparticles.
Claims17
Surface functionalized titanium dioxide nanoparticles treated with
- a) a phosphonate of formula:
- or a mixture of phosphonates of formula (I), wherein:
- R1 and R2 are independently of each other hydrogen, or a C1-C4alkyl group,
- R3 is a group CH2═CH—, or a group of formula —[CH2]n—R4, wherein
- n is an integer of 1 to 12,
- when n>3 one —CH2— may be replaced by —S— with a proviso that S is not directly linked to P, or R4,
- R4 is hydrogen, or a group of formula
- R5 is hydrogen, or a C1-C4alkyl group,
- R6 is hydrogen, or a C1-C4alkyl group,
- X1 is O, or NH, and
- b) bonded with an alkoxide of formula R7O− (II) and/or
- wherein:
- R7 is a C1-C8alkyl group, which may be interrupted one or more times by —O— and/or substituted one or more times by —OH,
- R8 is hydrogen, or a C1-C4alkyl group,
- R9 is hydrogen, —CH2OH, —CH2SPh, —CH2OPh, or a group of formula R10—[CH2OH—O—CH2]n1—,
- n1 is an integer of 1 to 5,
- X2 is O, or NH,
- R10 is a group of formula —CH2—X3—CH2—C(═O)—CR11═CH2,
- X3 is O, or NH, and
- R11 is hydrogen, or a C1-C4alkyl group.
A process for preparing titanium dioxide nanoparticles, the process comprising:
- (a) adding a solution of concentrated hydrogen chloride and diluting the solution with half volume of distilled water, diluting the solution with additional ethanol resulting in solution I to a solution of titanium-tetra-iso-propoxide first stirred in absolute ethanol resulting in a solution II, both volumes of the solutions I and II being equal, to obtain a clear solution,
- (b) stirring the obtained clear solution for 5 days at room temperature, and
- (c) evaporating the clear solution at 20-30° C./20 mm until a constant weight is achieved to obtain titanium dioxide nanoparticles.
Dependencies are inferred from the claim text.