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Method for production of bead polymers with an average particle size in the range of 1 degree to 40 degrees and moulded masses and moulded bodies comprising bead polymers

A technology for polymerizing compositions and polymers, applied in the field of molding compositions and moldings, dispersing and polymerizing polymerizable compositions, can solve the problems of unsuitable and ineffective light scattering particles, and achieve the effect of avoiding release or processing

Inactive Publication Date: 2011-07-06
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they are already unsuitable for light-scattering molding compositions, since the non-crosslinked polymer particles will dissolve in the molding composition to be prepared and thus cannot be effectively used as light-scattering particles

Method used

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  • Method for production of bead polymers with an average particle size in the range of 1 degree to 40 degrees and moulded masses and moulded bodies comprising bead polymers
  • Method for production of bead polymers with an average particle size in the range of 1 degree to 40 degrees and moulded masses and moulded bodies comprising bead polymers
  • Method for production of bead polymers with an average particle size in the range of 1 degree to 40 degrees and moulded masses and moulded bodies comprising bead polymers

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Embodiment Construction

[0110] The present invention will be described in more detail below by way of Examples and Comparative Examples, but it is not intended to limit the present invention to these Examples.

[0111] Scatter Beads A and C-F

[0112] For the preparation of suspension polymers, aluminum hydroxide Pickering stabilizers were used, which were prepared by precipitation of aluminum sulfate and soda solutions immediately before the actual polymerization started. For this purpose, 16 g of Al 2 (SO 4 ) 3 , 0.032g of complexing agent (Trilon A) and 0.16g of emulsifier (K30 emulsifier available from Bayer AG; C 15 - paraffin sulfonic acid sodium salt) was dissolved in 0.8 liters of distilled water. The 1N sodium carbonate solution is then added with stirring to the aluminum sulfate dissolved in water at a temperature of about 40[deg.] C., where the pH value is then 5-5.5. A colloidal distribution of the stabilizer in water is achieved by this procedure. In order to prevent deposition of...

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Abstract

The present invention relates to a method for production of bead polymers with an average particle size in the range 1mu to 40mu, whereby a polymerisable composition is dispersed and polymerised in an aqueous phase with generation of a dispersion stabilised by an aluminium compound having a shear speed = 10<3> s<-1>. A polymerisable composition is used, comprising, based on the total weight thereof, a) more than 50.0 wt. % of at least one compound of formula (I), whereby the groups <1>R to <6>R are as given in the description, b) 0.1 wt. % to 10.0 wt. % of at least one cross-linker and d) less than 49.9 wt. % of at least one compound of formula (II) whereby the groups R and <7>R to <9>R are as defined in the description. The bead polymers produced by the method are particularly suitable for the production of moulded bodies with light scattering properties.

Description

technical field [0001] The present invention relates to a process for preparing bead polymers having an average particle size of 1 μm to 40 μm, wherein a polymerizable composition is dispersed and polymerized in an aqueous phase. The invention also relates to molding compositions and moldings comprising the bead polymers prepared according to the invention. Background technique [0002] For different applications, bead polymers with particle sizes in the order of 1 μm to 40 μm and with relatively narrow particle size distributions are required. These beads can be used in particular as additives for PMMA molding compositions. [0003] Light-scattering molding compositions are to be considered in particular as fields of application. Here, standard molding compositions are mixed with so-called scattering beads, which are crosslinked and whose refractive index differs from that of the matrix. PMMA-based scattering particles are currently used in these molding compositions, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/00C08F2/44C08F2/16
CPCC08F212/08C08F2/44C08F222/1006C08F220/14C08F2/18C08F222/102C08F220/18C08J3/03
Inventor S·施瓦兹-巴拉克K·舒尔茨M·施纳贝尔S·那奥U·戈尔彻特
Owner EVONIK ROEHM GMBH
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