DISPONIL OP 4070

Alkylaryl polyglykol ether. 
Used as emulsifier for polymerization. 
Offers very good freeze/ thaw stability.

Uses of Disponil OP 4070:
Emulsifiers for the manufacture of polymer dispersions, predominantly of homopolymeric and copolymeric acrylates.

Applications of Disponil OP 4070: 
Application Example:
The following formula and manufacturing method may be regarded as a typical example for the use of Disponil OP 4070 in the manufacture of a polymer dispersion based on butyl acrylate:
 475.0 p.b.w. water, desalinated
 474.0 p.b.w. n-butyl acrylate (e.g. BASF)
 9.6 p.b.w. methacrylic acid (e.g. Degussa)
 39.0 p.b.w. Disponil OP 4070
 1.2 p.b.w. ammonium peroxodisulfate
 1.2 p.b.w. sodium hydrogen sulfite
1,000.0 p.b.w. polybutyl acrylate dispersion

Equipment:
Reaction vessel with two feeding devices (one of them with stirring mechanism), reflux cooler, mixing vessel.

Process of Disponil OP 4070:
Dissolve the ammonium peroxodisulfate and Disponil OP 4070 in 425 p.b.w. of distilled water. 
Fill 100 litres of this solution into the reaction vessel.
Disperse both the n-butyl acrylate and methacrylic acid into the remaining solution while stirring, and emulsify intensively for 15 minutes. 
Fill 100 litres of this emulsion, too, into the reactor vessel, while the rest of the emulsion is filled into the feeding device with stirring mechanism, and stirred until the end of the feeding time.

Dissolve the sodium hydrogen sulfite in 50 p.b.w. of water and fill this solution in the second feeding device. 
The monomer emulsion in the reaction vessel should now be rinsed with nitrogen for 30 minutes. 
Then allow 15 litres of the sodium hydrogen sulfite solution to flow into the vessel, and start heating. 
Polymerization will start at approximately 55 — 60 °C, noticeable by an increase of temperature. 
The temperature will rise to approximately 75 — 80 °C, but should be quickly reduced to approximately 68 °C. 

Start feeding both the monomer emulsion and sodium hydrogene sulfite solution into the reactor already while the temperature is rising. 
The feeding time in both cases is about two hours. 
During this whole period, the temperature must be kept between 67 and 69 °C.
Continue to stir for further 60 minutes at the same temperature, and afterwards allow the emulsion to cool down. 
Adjust it to a pH-value of about 8, using a 25 ammonia solution.

Composition: Alkylaryl polyglykol ether
Specification:
Water: 29.0 - 31.0 %
pH-value: 5.5 - 7.5
Q-P: 1274.0 - UNE 1262)

Additional data of Disponil OP 4070:
Active substance: approx. 70 %
Ionic character: non-ionic
Setting point: approx. 5 °C
Density at 20 °C: approx. 1.1 g/cm³
CMC (g AS/l): approx. 1.2
Cloud temperature 73 - 78 °C
Appearance: colourless to clear slightly yellow liquid

Properties of Disponil OP 4070:
Disponil OP 4070 is suitable for the manufacture of very finely dispersed polymer emulsions, which excel in their chemical stability (against NaCl, CaCl2, Al2 (SO4)3 and Pb(NO3)2) and also in their outstanding freeze/ thaw stability.
Disponil OP 4070 may be combined with commercially available anionic DISPONIL types of the ranges AES, FES, LDBS, SDS, SLS or SUS. 

Remark:
Nitrogen must be added during the whole reaction time. 
It is also very important not to stir too intensively at the beginning of the polymerization process, in order to avoid decomposition or coagulation.

Technical data of the polymer dispersion:
Appearance: white, thin liquid dispersion
Mechanical stability: 0.5 % coagulate
Freeze/thaw stability: very good 
Chemical stability: stable against NaCl, CaCl2, Al2(SO4)3 and Pb(NO3)2
Solid content: approx. 50 %

Applications of Disponil OP 4070:
e.g. raw material for adhesives, e.g. adhesive tape coatings.

Dosage of Disponil OP 4070:
The quantity required depends on the type and quantity of monomers used, the polymerization process involved, as well as on the desired properties of the polymer dispersions. 
Normally, 2 - 6% AS calculated on the monomer content are used.

Miscellaneous:
It is recommended to store Disponil OP 4070 at room temperature and to protect them against heat and frost. 
Subject to storage in the original sealed containers, the products are durable for at least 24 months.
Lenghty storage of Disponil OP 4070 can sometimes lead to sedimentation. 
This is a characteristic reaction of the product. 
It is, therefore recommandable to process the whole content of the containers.
 

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