Akzo Nobel N.v.

Nouryon Chemicals International B.v.

Celanese Switzerland Ag

Urs Heini

Hongli Willimann

Hans Wicki

Robert Koelliker

Alexander Zapf

Thomas Aberle

Andrey Petrovich Pustovgar

The present invention relates to the use of an additive as well as a process to improve the adhesion of a mortar to a building substrate, wherein the mortar is mixed with said additive and is applied to a building substrate selected from the group of polystyrene-containing substrates, polyolefin-containing substrates or polyvinyl chloride-containing substrates, the additive containing (i) a plasticizer that is liquid at 50&#xb0; C. or lower, has a boiling point of 100&#xb0; C. or higher, and that has a solubility parameter &#x3b4; 25&#xb0; C. between 22.5 MPaand MPa; (ii) optionally, a filler that has a BET surface area of at least 40 m/g; (iii) optionally, a biopolymer, (iv) optionally, a protective colloid; and (v) optionally, a water-insoluble film-forming (co)polymer based on ethylenically unsaturated monomers. The invention also covers an additive and a kit of parts suitable for use in the above process.

Process and additive to improve adhesion of building compositions to substrates

The present invention pertains to a water-redispersible polymer powder composition based on at least one synthetic polymer and at least one natural latex. Preferably, the polymer powder contains up to about 90 wt. % of at least one water-insoluble, synthetic polymer, up to about 90 wt. % of least one natural latex, about 0 to 50 wt. % of at least one protective colloid, about 2 to 50 wt. % of at least one filler and/or anti-caking agent, as well as optionally further additives. In addition, the invention pertains to a process for the preparation of the polymer powder composition, the use thereof as an additive in building material compositions, as well as building material compositions containing the polymer powder composition.

Redispersible polymer powder composition

The present invention pertains to a water-redispersible polymer powder based on at least one modified natural latex. The modified natural latex can be obtained by mixing natural latex with at least one radical initiator and/or oxidizing agent, by mixing and reacting natural latex with at least one olefinically unsaturated monomer and with at least one radical initiator, and/or by mixing natural latex with at least one filler. Preferably, the polymer powder contains up to about 95 wt. % of least one natural latex, about 0 to 50 wt. % of at least one protective colloid, about 2 to 70 wt. % of at least one filler and/or anti-caking agent, as well as optionally further additives. In addition, the invention pertains to a process for the preparation of the polymer powder, the use thereof as an additive in building material compositions, as well as building material compositions containing the polymer powder.

Redispersible polymer powder

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Neuenkirch, Switzerland

Urs Heini