Abstract:
The present invention refers to a waterborne copolymer dispersion comprising at least one alkenyl functional dendritic polymer being copolymerised to the polymer backbone of at least one homo or copolymer obtainable by polymerisation, such as emulsion polymerisation, in an aqueous medium of at least one at least one polymerisable allyl, vinyl, maleic or diene monomer. Said dendritic polymer is built up from a dendritic core polymer and at least one alkenyl functional compound bonded to said core polymer. In a further aspect the present invention refers to the use of said copolymer dispersion.
Abstract:
The present invention provides a coating composition containing 1) a carbamate-functional resin having in its structure a hyperbranched or star polyol core, a first chain extension based on a polycarboxylic acid or anhydride, a second chain extension based on an epoxy containing compound, and having carbamate functional groups on the core, the second chain extension, or both; and 2) a second resin containing functional groups reactive with the carbamate groups on the carbamate-functional resin. In one embodiment, the coating compositions are used as a clearcoat to be applied over a basecoat to form a composite coating. The compositions exhibit a combination of desirable properties, such as scratch and mar resistance, resistance to environmental etch, good intercoat adhesion, and high solids.
Abstract:
An aqueous coating composition comprising a crosslinkable water-dispersible hyperbranched macromolecule(s) wherein the composition when drying has an open time of at least 20 minutes, a wet edge time of at least 10 minutes, a tack free time and at 23 +/- 2 DEG C.
Abstract:
The invention is directed to a two-pack high solids low VOC ambient curable coating composition, which includes cross-linking and binder components. The cross-linking component includes a polyamine, a polyketimine or a combination thereof. The polyamine is provided on an average with at least two amine functionalities per polymer chain and the polyketimine is provided on an average with at least two ketimine functionalities per polymer chain. A reactive diluent in the binder component includes a macromolecule substantially free from acrylate functionalities and having at least two acetoacetate functionalities per the macromolecule. If desired, the coating composition includes a binder polymer. The coating composition of the invention is particularly suited in automotive refinish coating.
Abstract:
A multiplication polymerization process comprises providing a surface containing a plurality of reactive functional groups, reacting one or more of the reactive functional groups with a mer molecule capable of providing two or more reactive functional groups for each of the reactive functional groups reacted and repeating the foregoing steps until a desired polymeric film is attained. This method can be particularly employed with preparation of a hyperbranched polymer films on surfaces.
Abstract:
The invention relates to a dendritic macromolecule of the polyester type, which macromolecule is composed of a central initiator molecule or initiator polymer having one or more reactive groups (A), which groups (A) under formation of an initial tree structure are bonded to reactive groups (B) of a monomeric chain extender holding the two reactive groups (A) and (B). The tree structure is potentially extended and further branched from the initiator molecule or initiator polymer by an addition of further molecules of a monomeric chain extender by means of bonding between the reactive groups (A) and (B) thereof and is possibly further extended by a reaction with a chain stopper. The invention also comprises a process for preparation of the dendritic macromolecule and the use of such a macromolecule.
Abstract:
The invention relates to a dendritic macromolecule, comprising a core and branches emanating from the core, characterised in that the branches are prepared from vinyl cyanide units. The invention also relates to a process with which the dendritic macromolecule according to the invention can be prepared. The dendritic macromolecules according to the invention are not sensitive to degradation through hydrolysis reactions and are also very stable at a high temperature. The process is very suitable for use on a large scale and the synthesized intermediates do not have to be isolated.
Abstract:
The present disclosure relates to a composition comprising: at least one dendritic polymer prepared from hyperbranched polymer with hydroxyl groups, having a plurality of peripheral functional groups, wherein the peripheral functional groups comprising at least one cyclic ether group that is covalently bound to said hyperbranched polymer by urethane linkages; and a melamine-based crosslinker. Such compositions have improved flexibility. The present disclosure further relates to the use of such compositions to form coatings after cure, or as an additive component to binder resins.
Abstract:
A coating composition includes a flexible hyperbranched polyol preparable by (a) reacting a polyol comprising at least three hydroxyl groups with an aliphatic dicarboxylic acid having from 6to 36 carbon atoms or an esterifiable derivative of the aliphatic dicarboxylic acid to form a hydroxyl-functional first intermediate product; (b) reacting the first intermediate product with a cyclic carboxylic acid anhydride to form a carboxylic acid-functional second intermediate product; and (c) reacting the second intermediate product with an epoxide-functional compound having one epoxide group to form the hyperbranched polyol. The coating composition may be cured to a coating layer having excellent flexibility.