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A particle, particle technology, applied in the field of preparing the particle or dispersion or core-shell particle, to achieve the effect of enhancing brightness and improving mechanical load capacity
Inactive Publication Date: 2007-12-19
ROHM CO LTD
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Summary
Abstract
Description
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Problems solved by technology
In addition, the known core-shell particles are only of limited suitability for l
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0084] Example 1: Preparation of a dispersion of core-shell particles
[0085] Weighing weight [g]
note
initial charge
11.1
1,4-Butanediol diacrylate (BDDA)
99.4
Styrene
1.38
Sodium metabisulfite (Natriumdisulfite)
In 40ml desalted H 2 middle
4.2
Sodium Lauryl Sulfate (NaDS)
Texapon TM K12, added as a 15% solution / 27.95g
6060
desalinated water
Initiator 1
10.36
Sodium Peroxodisulfate 100%
As a 20.8% solution / 49.8ml form
1.41
Sodium metabisulfite 100%
As a 3.4% solution / 41.5ml form
Stir for 15 minutes
Solution 1
221.7
1,4-Butanediol diacrylate (BDDA)
Add solution 1 within 95min
2011.3
Styrene
4.25
Potassium hydroxide
10.3
Sodium Lauryl Sulfate (NaDS)
Texapon TM K12, added as 15% solution / 68.75g
2945
desalinated water
Post-stirring time ...
Embodiment 2
[0095] Example 2: Preparation of Particles of the Core-Shell Particles
[0096] 3 kg of core-shell particles obtained from Example 1 were pulverized in a cutting mill (Rapid Company, model: 1528) while cooling with ice, and then extruded in a single-screw extruder (Plasti-Corder; Brabender Company; screw diameter 19 mm) , with a 1-hole nozzle (3mm)) for compounding. After the cooling section, the compound was pelletized in an A 90-5 pelletizer (Automatik).
Embodiment 3a
[0097] Example 3a: Preparation of membranes from core-shell particles
[0098] 2 g of granules from Example 2 were heated to a temperature of 120° C. in a Collin 300P press without pressure and pressed at a pressure of 30 bar to form a film. After cooling to room temperature, the pressure was reduced again.
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Abstract
The invention relates to core-shell particles, the core of which is essentially solid with an essentially monodisperse size distribution, with a difference between the refractive index of the core material and the shell material. The core is made from a material which either does not flow or does so at a temperature above the flow temperature of the shell material and the shell is connected to the core by means of an intermediate layer, characterised in that the shell is made from a copolymer with at least one C4-C8 alkylacrylate and at least one C4-C8 alkyl- or -alkylarylmethacrylate as monomer component.
Description
technical field [0001] The present invention relates to particles or dispersions comprising core-shell particles, and to said core-shell particles and to processes for preparing such particles or dispersions or core-shell particles. Background technique [0002] Patent application WO 03 / 25035 discloses moldings consisting essentially of core-shell particles whose shell forms the matrix and whose core is substantially solid and has a substantially monodisperse size distribution, wherein the The shell is preferably firmly bonded to the core via an intermediate layer. The refractive indices of the core material and the shell material are different here, which leads to the described optical effect, preferably opalescence. In a preferred embodiment according to WO 03 / 25035, the core of the core-shell particles consists of cross-linked polystyrene and the shell consists of polyacrylate, preferably polyethylacrylate, polybutylacrylate, polymethylacrylate methacrylate and / or its c...
Claims
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Application Information
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