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Method for producing silicone-treated polymers

A polysiloxane and polymer technology, which is applied in the field of protective colloids containing polysiloxane units, can solve the problems of uneven polymer, poor particle size distribution, and excessive particle size.

Inactive Publication Date: 2007-05-16
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, these emulsion polymers have poor particle size distribution by incorporation of large amounts of silanes or polysiloxanes, i.e. the particles become too large and the polymer becomes inhomogeneous, which can lead to slurry formation or phase separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment a

[0073] 54.65 kg of ethyl acetate, 303.33 g of polydimethylsiloxane (PDMS) mixture (=Dehesive  929), 5.47 kilograms of isopropanol, 44.71 grams of PPV (75% solution of tert-butyl perpivalate in aliphatic hydrocarbon) and 2.73 kilograms of vinyl acetate charged with anchor type stirring In a 120-liter stirred vessel with a reflux cooler and a metering device. The starting material was then heated to 70° C. at a stirring speed of 95 rpm. After the internal temperature had reached 70° C., initiator metering (4.10 kg of ethyl acetate and 173.91 g of PPV) was started at a rate of 826 g / h. 10 minutes after initiation of the initiator metering, the monomers were metered in at a rate of 6.08 kg / hour (2.43 kg of PDMS mixture and 21.86 kg of vinyl acetate). The initiator metering process lasted 310 minutes, while the monomer metering ended 60 minutes earlier. After completion of the metered addition of both, a further postpolymerization at 70° C. for 120 minutes was carried out. The...

Embodiment b

[0077] 51.57 kg of ethyl acetate, 481.63 g of PDMS mixture (Dehesive929), 8.09 kg of isopropanol, 51.78 g of PPV (75% solution of tert-butyl perpivalate in aliphatic hydrocarbon) And the vinyl acetate of 2.53 kilograms is packed in the 120 liters stirring vessels that have anchor type stirrer, reflux cooler and metering feeding device. The starting material was then heated to 70° C. at a stirring speed of 95 rpm. After the internal temperature had reached 70° C., metering of the initiator (4.07 kg of ethyl acetate and 201.33 g of PPV) was started at a rate of 827 g / h. 10 minutes after initiation of the initiator metering, the monomers (3.86 kg of PDMS mixture and 20.25 kg of vinyl acetate) were metered in at a rate of 6.03 kg / hour. The metering of the initiators took 310 minutes, while the metering of the monomers ended 60 minutes earlier. After completion of the metered addition of both, a further postpolymerization at 70° C. for 120 minutes was carried out. The resulting ...

Embodiment c

[0081] 49.97 kg of ethyl acetate, 651.01 g of PDMS mixture (Dehesive929), 9.38 kg of isopropanol, 58.88 g of PPV (75% solution of tert-butyl perpivalate in aliphatic hydrocarbon) And the vinyl acetate of 2.34 kilograms is packed in the 120 liters stirring vessels that have anchor type stirrer, reflux cooler and metering feeding device. The starting material was then heated to 70° C. at a stirring speed of 95 rpm. After the internal temperature had reached 70° C., metering of the initiator (4.05 kg of ethyl acetate and 228.88 g of PPV) was started at a rate of 829 g / h. Ten minutes after initiation of the initiator metering, the monomers were metered in at a rate of 6.0 kg / hour (5.21 kg of PDMS mixture and 18.77 kg of vinyl acetate). The metering of the initiators took 310 minutes, while the metering of the monomers ended 60 minutes earlier. After completion of the metered addition of both, a further postpolymerization at 70° C. for 120 minutes was carried out. The resulting ...

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Abstract

The invention relates to a method for producing silicone-treated polymers in the form of the aqueous polymeric dispersions or powders thereof by radical polymerisation of ethylene non-saturated monomers in an aqueous medium and in drying the such obtained polymeric dispersions. The inventive method consists in polymerising one or several monomers of the group comprising vinyl esters of linear or branched alkylcarboxylic acids having 1-15 C atoms, alcohol methacrylates and acrylates having 1-15 C atoms, aromatic vinyl compounds, olefins, dienes and vinyl halides, a mixed silicon-containing vinyl alcohol polymer being added before, during and after the polymerisation. Said mixed polymer contains a) 0-60 mass % one or several monomer units of vinyl esters of linear or branched alkylcarboxylic acids having 1-15 C atoms, b) 20-99.5 mass % vinyl alcohol monomer units, c) 0.5-70 mass % monomer units of one or several silicones of general formula R<1 >aR3 a SiO (SiR2 O)n SiR3-aR<1>a.

Description

technical field [0001] The present invention relates to a process for the production of polysiloxane-modified polymers in the form of their aqueous polymer dispersions or in the form of their polymer powders, as well as their use and protective colloids containing polysiloxane units . Background technique [0002] Organosilicon compounds such as organosiloxane polymers are used to hydrophobize polymers formed from ethylenically unsaturated monomers. These hydrophobically modified polymers are used in many fields in the form of their polymer powders, especially in the form of water-redispersible polymer powders, or as aqueous polymer dispersions. They are used as binders in coatings or adhesives, especially in the construction sector or in the textile sector, as well as in cosmetic and hair care products. [0003] The modification of water-redispersible polymer powders by adding non-copolymerizable organosilicon compounds is known from WO-A 95 / 20626. EP-A 0352339 describes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F230/08C08F2/30
CPCC08F2/30
Inventor 库尔特·施塔克克里斯蒂安·赫格尔
Owner WACKER CHEM GMBH