At a Glance
WACKER has manufactured dispersions based on poly(vinyl acetate) (PVAc) on an industrial
scale since 1938. The ongoing development and enhancement of the technology continually
opens up new innovative technologies: the first copolymer dispersion without the addition
of plasticizers, the development from a dispersion into a patented dispersible polymer
powder, and the discovery of VAE (vinyl acetate-ethylene) technology for sustainable
VAE copolymer dispersions, with applications such as water-based adhesives. The dispersions
are marketed under the trade name VINNAPAS® and VINNOL® Vinnacoat, and are suitable for use as high-quality environmentally friendly polymer
binders for various applications, where they optimize products and processes in a
number of ways.
Thanks to VINNAPAS® dispersions based on to vinyl acetate-ethylene (VAE) or vinyl chloride-ethylene (VC-E),
paints and coatings can be formulated as low-VOC products, offering outstanding wet-scrub
resistance, good color fastness, high abrasion and water resistance, and reduced dirt
In construction applications such as plasters and renders, EIFS/ETICS systems, waterproofing
membranes and paste tile adhesives, as well as very generally in cement mixes, VAE
copolymer dispersions reinforce the properties of the end product, such as adhesion
and cohesion (bonding), flexibility and processability.
Waterborne adhesives modified with VINNAPAS® copolymer dispersion or VINNAPAS® (poly(vinyl acetate)) homopolymer dispersions for paper and packaging, wood and furniture
lamination and for floor coverings, provide excellent adhesion, high heat resistance,
good water resistance, high processing speeds and a wide range of formulations.
Dispersions based on VAE and VC-E copolymers are used in nonwovens and textiles, such
as serviettes, moist wipes and air filters to provide the end product with superb
wet and dry tear strength, a pleasant feel, absorption, flame retardance and abrasion
resistance, as well as dimensional stability. In carpet backings for tufted carpets,
needlefelt, woven or flock carpets, and tapestries, VAE or VC‑E-based dispersions
ensure the required resistance, flexibility and compliance with emission limits.
Paper coatings can be modified with VINNAPAS® VAE copolymer dispersions that meet the high requirements made for competitive products
in the paper and board coating industries.
Dispersion is defined by the following criteria:
- White / transparent liquid
- Water as a liquid medium
- Solid, spherical polymer particles in water
- Particle diameter: 50 – 5,000 nm
- Solids content up to 74% (normally 50%)
- Over 104 – 109 particles per liter of dispersion
- Stabillization system (anionic, cationic or steric)
Dispersions can be produced at atmospheric pressure or under pressure. Atmospheric
pressure polymerization takes place under normal conditions. A typical example is
the production of styrene-acrylate and VAC-VeoVa dispersions. Pressurized polymerization
is much more complicated and costly. Not every manufacturer of dispersions and dispersible
polymer powders in the world has such facilities and is therefore capable of producing
ethylene-based polymer dispersions.
Production of VAE Dispersions
New Labeling Regulations for Methylisothiazolinone (MIT)
Products that are preserved with Methylisothiazolinone (MIT, CAS: 2682-20-4) will
require new labeling, getting effective May 1st, 2020.
The new labeling includes hazard statement H 317: “May cause an allergic skin reaction”
and the GHS07 “exclamation mark” pictogram where the MIT concentration is > 15 ppm.
WACKER is consistently implementing the new classification and, as a responsible raw-materials
producer, we are, of course, investigating alternative possibilities with regard to
product preservation to support our customers. Where possible, we will offer alternative
solutions in the future that will continue to ensure sufficient biostability and avoid
labeling. If you have any questions, feel free to get in touch with your usual contacts.
More information on this topic can be found in our “MIT fact sheet”.