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1. (WO2006052984) VERNIS-LAQUES A SECHAGE RAPIDE CONTENANT UN ADDITIF DE REGLAGE RHEOLOGIQUE AMELIORE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS
What is claimed is:
1. A lacquer coating composition comprising a graft copolymer with segmented side arm(s), wherein the graft copolymer has a polymeric backbone and segmented arm(s) formed of at least two polymeric segments of differing composition, grafted at a single point thereof to the backbone, wherein
(a) the backbone is of polymerized ethylenically unsaturated monomer(s); and
(b) the segmented arm(s) are of polymerized ethylenically unsaturated monomer(s) that are attached to the backbone via a single point,
and wherein at least one of the arm segments, which is at least one segment separated from the backbone, and the backbone contain one or more functional groups that are capable of interacting with each other for the formation of a reversible network, and the arm segment(s) adjacent to said arm segment is essentially free of said interactive functional groups, wherein the functional groups are selected from at least one of the group consisting of carboxylic acid, hydroxyl, urea, amide, and ethylene oxide groups, and any mixtures thereof.
2. The composition of claim 1, wherein the segmented arm(s) are formed from a macromonomer having a segmented structure that is polymerized into the backbone via a single terminal ethylenically unsaturated group.
3. The composition of claim 1 wherein the segmented arm(s) are formed with two segments of either AB block or tapering architecture.
4. The composition of claim 1, wherein the at least one segment on the arm that contains one or more of said functional groups is the furthest arm segment from the backbone.
5. The composition of claim 1 , wherein the at least one dissimilar arm segment is a non-functional segment, essentially free of functional groups.
6. The composition of claim 1 wherein the segmented arm(s) contain an inner segment attached directly to the backbone and an adjacent outer segment attached to the inner segment, wherein the inner segment is essentially free of functional groups and the outer segment contains at least one of said functional groups.

7. The composition of claim 1, wherein the segmented arm(s) of the graft copolymer are formed from a macromonomer having a segmented AB structure that is polymerized into the backbone via a single terminal ethylenically unsaturated group on the B segment.

8. The composition of claim 7, wherein the B segment is a non-functional segment, essentially free of functional groups.
9. The composition of claim 1 , wherein the segmented polymer has a weight average molecular weight of about 5,000 to 200,000.
10. The composition of claim 1, wherein at least 1% by weight of the monomers used to form the functional arm segment and backbone contain said interactive functional groups.
11. The composition of claim 1 , wherein about 5 to 60% by weight of the monomers used to form the functional arm segment and backbone contain said interactive functional groups.
12. The composition of claim 1 , wherein the graft copolymer is made primarily from acrylic monomers.
13. A lacquer coating composition comprising a film-forming binder and an organic liquid carrier, wherein the binder contains a graft copolymer with segmented arm(s), wherein the graft copolymer is an ABA' graft copolymer, which comprises a polymeric backbone A' and segmented arm(s) formed of at least two polymeric segments A and B of differing composition, grafted onto the backbone, wherein
(a) the backbone is of polymerized ethylenically unsaturated monomers; and

(b) the segmented arm(s) are of polymerized ethylenically unsaturated monomers that are attached to the backbone via a single point on the B segment,
and wherein the segments on the arm(s) are formed of substantially differing composition and
wherein the A and A1 segments have the same or similar composition and the B segment has a different composition from the A and A1 segments;
wherein the A and A' segments differ from the B segment by the presence of one or more functional groups that are capable of interacting with each other for the formation of a reversible network;

wherein the functional groups are selected from at least one of the group consisting of carboxylic acid, hydroxyl, urea, amide, and ethylene oxide groups, or mixtures of any of the above.
14. The composition of claim 13 wherein the segmented arm(s) of the graft copolymer are formed from a macromonomer having a segmented A-B structure that is polymerized into the backbone via a single terminal ethylenically unsaturated group on the B segment.
15. The composition of claim 1 or 13 wherein the network-forming group is selected from the group consisting of carboxylic acid groups.
16. The composition of claim 1 or 13, wherein said lacquer further comprises, as part of the binder, an acrylic polymer, polyester, a highly branched copolyester polyol, alkyd resin, acrylic alkyd resin, cellulose acetate butyrate, an iminated acrylic polymer, ethylene-vinyl acetate co-polymer, nitrocellulose, plasticizer or a combination thereof.

17. The composition of claim 1 or 13, wherein said lacquer further comprises as part of the binder, a crosslinking agent.
18. The composition of claim 1 or 13, wherein said lacquer further comprises metallic driers, chelating agents, or a combination thereof.
19. The lacquer of claim 1 or 13, wherein the lacquer also comprises a pigment, flake or a combination thereof.
20. A process for producing a coating on the surface of a substrate, said process comprising:
applying a layer of a lacquer of claim 1 or 13 on said surface; and
drying said layer to form said coating on said surface of said substrate.
21. The process of claim 20 further comprising applying a layer of clear coating composition over said layer of said lacquer.
22. The process of claim 21 wherein said lacquer is a pigmented basecoat composition.
23. The process of claim 20 wherein said drying step takes place under ambient conditions.
24. The process of claim 20 wherein said drying step takes place at elevated temperatures.

25. The process of claim 20 wherein said lacquer is a pigmented basecoat or a clearcoat composition.
26. A coated substrate produced in accordance with the process of claim 20.