Crosslinkable polymer binder
AssigneeNuplex Resins B.V.
InventorsDirk Emiel Paula MESTACH, Anneke VAN DER ZANDE
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Abstract
The invention relates to a crosslinkable polymer binder comprising a polyurethane macromer and grafted thereon a vinyl polymer, to an aqueous dispersion comprising said crosslinkable polymer binder and to a process for the manufacture of said crosslinkable polymer binder and said aqueous dispersion thereof. The crosslinkable polymer binder can be used in coating compositions or adhesives.
Claims21
A crosslinkable polymer binder comprising a polyurethane macromer and grafted thereon a vinyl polymer, the macromer being prepared by reacting:
- a monomer (I) comprising 2 or more hydroxy functional groups,
- a monomer (II), comprising 2 or more isocyanate functional groups,
- a stabilizing monomer (III) comprising at least one of ionically and non-ionically stabilising groups,
- a graft monomer (IV) having only one group reactive with monomer I or II and one vinyl group,
- a chain stopper monomer (V) having only one group reactive with monomer I or II, which chain stopper (V) is a monoamine or a monoalcohol selected from the class of linear or branched C1-C22 aliphatic monoalcohols or aromatic alcohols,
- wherein at least 30 mole %, of the macromers have only one graft monomer IV and less than 50 mole % of the macromers have two or more graft monomers IV, wherein the vinyl polymer is linked to the vinyl group of graft monomer IV and wherein at least one of the vinyl polymer and the macromer comprise crosslinkable groups.
A process for the manufacturer of a crosslinkable polymer binder comprising a polyurethane macromere and grafter thereon a vinyl polymer, comprising the steps of:
- (1) forming a macromer by reacting;
- a monomer (I) comprising 2 or more hydroxy functional groups,
- a monomer (II), comprising 2 or more isocyanate functional groups,
- a stabilizing monomer (III) comprising at least one of ionically and non-ionically stabilising groups,
- a graft monomer (IV) having only one group reactive with monomer I or II and one vinyl group,
- a chain stopper monomer (V) having only one group reactive with monomer I or II, wherein the amount of chain stopper monomer V relative to the amount of graft component IV is chosen such that at least 30 mole % of the macromers have only one graft monomer IV and less than 50 mole % of the macromers have two or more graft monomers IV;
- (2) adding vinyl monomer before, during or after step (1);
- (3) optionally neutralizing the obtained reaction product,
- (4) emulsifying the obtained reaction product in water;
- (5) after emulsifying adding a radical starter to react the vinyl monomers,
- wherein at least one of the vinyl polymer and the macromer comprise crosslinkable groups.
Dependencies are inferred from the claim text.