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Hesry A.-S.,Synthomer Deutschland GmbH
PPCJ Polymers Paint Colour Journal

Paint producers are now moving towards waterborne (WB) systems such as alkyd emulsions and acrylic dispersions with much lower VOC levels. Alkyd emulsions have the potential to achieve high gloss, good flow and high film resilience in wood coatings. In order to optimize our acrylic polymers a study comparing core-shell acrylic dispersions with their blended analogues in a wood varnish was undertaken. A series of samples were prepared in which the core- shell and blended analogues had similar crosslinked copolymers (Tg). It was found that, despite their similar Tgs, the blended samples had lower MFFT values than the corresponding core-shell samples, while the core-shell dispersions gave a clear transparent film, whereas the blended versions generally gave a hazy film with harder combinations. In each case, the blended samples gave poorer water spotting and showed more film whitening than the core-shell samples, again indicating the negative impact of aggregates of harder polymer particles. Source

Bernhofer T.,Synthomer Deutschland GmbH
European Coatings Journal

1K acrylics for industrial interior wood coatings can be enhanced by advanced colloidal structure and polymer constitution, enabling high-performance, yet cost-effective, coatings for applications such as parquet wood flooring. Source

Oliveira E.D.,Federal University of Minas Gerais | Casella E.L.,Mackenzie Presbyterian University | Araujo O.,Synthomer Deutschland GmbH | Giudici R.,University of Sao Paulo
Industrial and Engineering Chemistry Research

A mathematical model for emulsion copolymerization process of 1,3-butadiene and methyl methacrylate is presented and validated with experimental data in a batch reactor. The model is able to explain the effects of changes in temperature, monomer-to-water ratio, emulsifier concentration, initiator concentration, and monomer feed composition on the time evolution of monomer conversion, average particle size, and pressure. Despite its simplicity and a reduced number of adjustable parameters, the model is capable of accounting for the basic features of emulsion copolymerization processes and can be used in engineering applications. © 2013 American Chemical Society. Source

Synthomer Deutschland Gmbh | Date: 2013-06-17

A reaction product is obtained by free-radical emulsion polymerization in an aqueous medium of ethylenically unsaturated monomers including at least one conjugated diene. The free-radical emulsion polymerization is conducted in the presence of a degraded polysaccharide having a DE of 38 to 70 measured according to ISO 5377 (1981 Feb. 15) and optionally an alkyl mercaptan in an amount of no more than 2.5 weight percent based on the total weight of ethylenically unsaturated monomers. A coating composition includes the reaction product, and a paper or a board can be coated with such a coating composition.

Froimowicz P.,Max Planck Institute for Polymer Research | Froimowicz P.,Grenoble Institute of Technology | Van Heukelum B.,Synthomer Deutschland GmbH | Scholten C.,Synthomer Deutschland GmbH | And 3 more authors.
Journal of Polymer Science, Part A: Polymer Chemistry

Symmetric SBS latexes are prepared for the first time following a non-stop one-pot reversible addition fragmentation chain transfer (RAFT) polymerization in miniemulsion. The symmetry of the SBS is studied spectroscopically and chemically, which opens possibilities for further functionalizations. The morphology of the resulting nanoparticles is presented. The process can be realized at the pilot plant scale and is expected to be extrapolable to other monomers and to different polymerization methods. Copyright © 2014 Wiley Periodicals, Inc. Source

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