Thiol star polymer containing central hub with multiple radiating addition copolymer structures
AssigneeImperial Chemical Industries PLC
InventorManish Sarkar
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Abstract
The invention provides a co-polymer having a hub portion from which radiate from 3 to 8 arms where the hub portion is the residue of a tri-functional to octa-functional thiol and each arm is an addition polymer comprising structural units and functional units that are mutually compatible, the functional units including crosslinking substituents capable of undergoing a crosslinking reaction with a crosslinking agent or crosslinking substituent in functional units in another molecule of the same polymer and optionally compatible auxiliary functional units that contain wetting groups.
Claims20
A coating composition comprising a star copolymer having a central hub of trifunctional to octo-functional thiol residues, the central hub having from three to eight polymeric arms where each polymeric arm radiates from one of the thiol residues of the central hub, each polymeric arm being an addition polymer of copolymerized ethylenically unsaturated monomers containing functional units having a crosslinking substituent selected from,
- a hydroxyl group,
- an isocyanate group,
- a blocked isocyanate group,
- an epoxy group,
- a carboxy group or a salt thereof,
- an allyoxyester group,
- a 2-hydroxy-3-allyloxy propyl ester group, or
- mixtures of the foregoing crosslinking substituents,
- where the crosslinking substituent is capable of intermolecular crosslinking with crosslinking agent or with a coreactive crosslinking substituent in another molecule of the state polymer, to provide a crosslinked cured coating film.
A film forming, crosslinkable star copolymer, the star copolymer having a central hub of trifunctional to octo-functional thiol residues, the central hub having from three to eight polymeric arms where each polymeric arms radiates from one of the thiol residues of the central hub, each polymeric arm being an addition polymer of copolymerized ethylenically unsaturated monomers containing functional units having a crosslinking substituent selected from,
- a hydroxyl group,
- an isocyanate group,
- a blocked isocyanate group,
- an epoxy group,
- a carboxy group or a salt thereof,
- an allyoxyester group,
- a 2-hydroxy-3-allyloxy propyl ester group, or
- mixtures of the foregoing crosslinking substituents, where the crosslinking substituent is capable of intermolecular crosslinking with a crosslinking agent or with a coreactive crosslinking substituent in another molecule of the star polymer.
Dependencies are inferred from the claim text.