The present invention relates to additive compositions for controlling rheology and mechanical properties that can be used in polymerizable compositions, sealants, paints or else adhesives. These compositions provide an improvement in the control of the rheology; they have in particular a viscosity and a yield stress which can be adjusted. Owing to the nature of the constituents therein, they provide reinforcement of the mechanical properties of the formulations containing them.

The present invention relates to copolymer obtained by polymerizing a monomer mixture comprising: (a) at least one monomer selected from the group consisting of 2-octyl (meth)acrylate, 2-methylbutyl acrylate and 3-methylbutylacrylate; (b) isobornyl (meth)acrylate: (c) optionally at least one carboxyl-functional ethylenically unsaturated monomer; and (d) optionally at least one ethylenically unsaturated monomer other than (a), (b) and (c). A composition comprising the copolymer and its uses in adhesives and coatings are also provided.

Multiphase polymers comprising crosslinking monomers and polyfunctional amine are disclosed. The multiphase polymer comprises a first phase polymer having a Tg from 60 C. to 240 C., a second phase polymer having a Tg from 40 C. to 240 C., and a soft phase polymer having a Tg from 25 C. to 30 C. The crosslinking monomers include a triacrylate such as trimethylol propane triacrylate, an unsaturated alkoxysilane, and an unsaturated keto monomer reactive with the polyfunctional amine. In contrast to conventional knowledge, incorporation of trimethylolpropane triacrylate reduces the minimum film forming temperature of multiphase polymers. This unusual reduction in MFFT helps to reduce the VOC requirement to form a good film at low VOC. The other crosslinking monomers including unsaturated alkoxy silane and unsaturated keto monomer which react with the polyfunctional amine improve print resistance, block resistance and lower the tackiness of paint films. The multiphase polymer is particularly suitable for use in deep base paints.