Emulsion polymers, aqueous dispersions and method for producing the same

A technology of emulsion polymers and mixtures, which is applied in transportation, packaging, thin material handling, etc. It can solve the problems of low storage capacity and achieve the effects of low residual monomer content, improved open time, and high adhesion strength

Inactive Publication Date: 2010-12-29
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A disadvantage of the dispersions described in

Method used

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  • Emulsion polymers, aqueous dispersions and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] First, 172 g of butyl acrylate (BA), 128 g of methyl methacrylate (MMA), 80 g of methacryloyloxy-2-hydroxypropyl- Oleate, 20 g methacrylic acid (MAS), 1.2 g ammonium peroxodisulfate (APS), 12.0 g Disponil FES 32 (30% strength) and 359.18 g water were emulsified for 3 minutes. Methacryloxy-2-hydroxypropyl-linoleate is obtained by reacting linoleic acid with glycidyl methacrylate.

[0122] Into a 2 liter glass reactor tempered with a water bath and equipped with a paddle stirrer, 230 g of water and 0.3 g of Disponil FES 32 (30% strength) were initially charged and this initial charge was heated to 80° C. and mixed with 0.3 g Ammonium peroxodisulfate (APS) (in dissolved form in 10 g of water) was blended. 5 minutes after the addition of the APS, the previously prepared emulsion was metered in within 240 minutes (interval: 3 minutes feed, 4 minutes pause, 237 minutes remainder feed).

[0123] After the feed was complete, the batch was post-stirred at 80° C. for 1 hour. T...

Embodiment 2

[0131] Example 1 was essentially repeated, but in which 80 g of methacryloxy-2-hydroxypropyl-oleate were used. The methacryloxy-2-hydroxypropyl oleate is obtained by reaction of oleic acid with glycidyl methacrylate.

[0132] The prepared emulsion had a solids content of 40±1%, a pH of 2.5, a viscosity of 16 mPas and an r of 71 nm N5 value.

[0133] The results obtained with the analytical methods described above are given in Table 1.

[0134] For comparison, commercially available alkyd resins were investigated, wherein as comparative example 1, an alkyd resin commercially available from the company Worlée under the trade name E 150W was investigated, and as comparative example 2, Xyladecor, manufactured by ICI Company sales. The results obtained are described in Table 1.

Embodiment 3

[0143]Example 1 was essentially repeated, wherein the dispersion was prepared via the miniemulsion method. For this purpose, 400 g of butyl acrylate, 390 g of methyl methacrylate, 200 g of methacryloyloxy-2-hydroxypropyl-linoleate and 10 g of methacrylic acid were emulsified with 20 g of sodium lauryl sulfate. As a hydrophobic agent, 4% hexadecane was additionally added. The polymerization was initiated at 75°C with 1% AIBN. The obtained dispersion has an r of 51 nm N5 value and a pH of 4.1. The coating formed from this dispersion showed a weight loss in MIBK of 11.7%, a water absorption after 24h of 22.8% and a tensile strength of 5.1 MPa.

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Abstract

The invention relates to an emulsion polymer comprising at least one (meth)acrylate segment that comprises between 1 and 30 % by weight of units derived from (meth)acrylates with at least one double bond and between 8 and 40 carbon atoms in the alkyl group, between 1 and 10 % by weight of units derived from monomers containing acid groups and between 50 and 98.9 % by weight of units derived from (meth)acrylates with between 1 and 6 carbon atoms in the alkyl group, each weight percentage relating to the weight of the (meth)acrylate segment. According to the invention, the emulsion polymer has a particle radius of at least 50 nm.

Description

technical field [0001] The present invention relates to emulsion polymers and aqueous dispersions comprising these emulsion polymers. The invention further relates to a process for the preparation of these dispersions and emulsion polymers. Background technique [0002] Coatings, especially lacquers, have been produced synthetically for a long time. Many of these coatings are based on so-called alkyd resins, which are prepared using polybasic acids, alcohols and fatty acids and / or fatty acid derivatives. A specific class of these alkyd resins form crosslinked films when exposed to oxygen, where the crosslinking proceeds by oxidation in the presence of unsaturated groups. Many of these alkyd resins contain organic solvents or dispersants so that such resins can be applied in thin layers to coated forms. However, the use of these solvents should be abandoned for reasons of environmental protection and work safety. Corresponding resins based on aqueous dispersions have ther...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F220/68
CPCC08F220/18C08F220/06C08F220/26C08F220/68C08F220/1804Y10T428/2982C08F2/22C08F20/18C08L33/06
Inventor C·布瑞尼尔J·克内贝尔G·施米特D·泰斯米尔
Owner EVONIK ROEHM GMBH
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