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1. WO1984000770 - COMPOSITIONS DE REVETEMENT A TENEUR EN SOLIDES ELEVEE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]
Cl aims

1. A thermosetting coating composition which reacts in situ during curing at elevated temperatures, characterized in that said composition comprises a mixture of:

(A) polyol having a number average molecular weight (Mn) of between about 130 and about 5000;

(B) dicarboxylic acid anhydride comprising at least about
50 percent by weight of alkyl hexahydrophthalic
anhydride, said dicarboxylic acid anhydride being included in said composition in an amount so as to provide between about 0.25 and about 1.5 anhydride
groups for each hydroxy group on said polyol;

(C) epoxy having one or more epoxide groups per molecule and having a number average molecular weight (Mn) of between about 130 and about 1500, said epoxy being
included in said composition in an amount so as to
provide at least about 1.0 epoxide groups for each
anhydride group; and

(D) amine-aldehyde crosslinking agent included in said
composition in an amount sufficient to provide at
least about .60 nitrogen crosslinking functional groups for each hydroxyl group initially present in said composition on said polyol (A).

2. A coating composition according to claim 1, wherein said polyol is selected from the group consisting of aliphatic polyols, polyhydroxy esters and polyhydroxy oligomers.

3. A coating composition according to claim 2, wherein said aliphatic polyol is a branched diol wherein the hydroxyl groups of said diol are not attached to adjacent carbon atoms.

4. A coating composition according to claim 3, wherein said diol is 2-ethyl-l, 3-hexane diol.

5. A coating composition according to claim 1, wherein the alkyl group of said alkyl hexahydrophthalic anhydride comprises a lower alkyl group h'aving up to about seven carbons.

6. A coating composition according to claim 1, wherein said dicarboxylic acid anhydride comprises at least about 80 percent by weight of an alkyl hexahydrophthalic anhydride.

7. A coating composition according to claim 1 or 6, wherein said dicarboxylic acid anhydride is included in said composition so as to provide between about 0.30 and about 1.2 anhydride groups for each hydroxyl groups on said polyol.

8. A coating composition according to claim 5 or 6, wherein said alkyl hexahydrophthalic anhydride is methyl hexahydrophthalic anhydride.

9. A coating composition according to claim 1, wherein up to about 50 percent by weight of said dicarboxylic acid anhydride comprises an anhydride selected from the group consisting of hexahydrophthalic anhydride, 2-dodecene-l-ylsuccinic anhydride, tetrahydrophthalic anhydride, methyl tetrahydrophthalic anhydride, camphoric anhydride, and mixtures thereof.

10. A coating composition according to claim 1, wherein said epoxy contains two epoxide groups per molecule.

11. A coating composition according to claim 1 or 10, wherein said epoxy is a saturated epoxy.

12. A coating composition according to claim 11, wherein said epoxy contains terminal epoxide functionality.

13. A coating composition according to claim 1, wherein said amine-aldehyde crosslinking agent is selected from the group consisting of condensation products of formaldehyde with melamine, substituted melamine, urea, benzoquanamine and substituted benzoquanamine, and mixtures of said condensation products in an amount sufficient to provide between about 0.75 and about 2.75 nitrogen crosslinking functional groups for each hydroxyl group initially present in said composition on said polyol (A).

14. A coating composition according to claim 1, wherein said composition further comprises up to 15 weight percent, based on the total weight of said composition, of a flow control additive.

OMPI

15. A coating composition according to claim 1, wherein said dicarboxylic acid anhydride consists of methyl hexahydrophthalic anhydride and said epoxy is a diepoxide.

16. A high solids thermosetting coating composition which reacts in situ during curing at elevated temperatures, which contains greater than about 60 percent by weight of nonvolatile solids and which, except for pigments and other nonreactive components, is characterized in that it consists essentially of a mixture of:

(A) polyol having a number average molecular weight (Mn) of between about 130 and about 5000;

(B) dicarboxylic acid anhydride comprising at least about
50 percent by weight of alkyl hexahydrophthalic
anhydride, said dicarboxylic acid anhydride being included in said composition in an amount so as to provide between about 0.25 and about 1.5 anhydride
groups for each hydroxyl group on said polyol;

(C) epoxy having one or more epoxide groups per molecule and having a number average molecular weight (Mn) of between about 130 and about 1500, said epoxy being
included in said composition in an amount so as to
provide at least about 1.0 epoxide group for each
anhydride group; and

(D) amine-aldehyde crosslinking agent included in said
composition in an amount sufficient to provide at
least about .60 nitrogen crosslinking functional
groups for each hydroxyl group initially present in
-said composition on said polyol (A).

17. A coating composition according to claim 16, wherein said polyol is selected from the group consisting of aliphatic polyols, polyhydroxy esters and polyhydroxy oligomers.

18. A high solids coating composition according to claim 17, wherein said aliphatic polyol is a branched diol wherein the hydroxy groups of said diol are not attached to adjacent carbon atoms.

19. A high solids coating composition according to claim 18, wherein said diol is 2-ethyl-l, 3-hexane diol.

20. A high solids coating composition according to claim 16, wherein the alkyl group of said alkyl hexahydrophthalic anhydride comprises a lower alkyl group having up to about seven carbons.

21. A high solids coating co poosition according to claim 16, wherein said dicarboxylic acid anhydride comprises at least about 80 percent by weight of an alkyl hexahydrophthalic anhydride.

22. A high solids coating composition according to claim 16 or 21, wherein said dicarboxylic acid anhydraide is included in said composition in an amount so as to provide between about 0.30 and about 1.2 anhydride

5 groups for each hydroxyl groups on said polyol.

23. A high solids coating composition according to claim 20 or 21, wherein said alkyl hexahydrophthalic anhydride is methyl hexahydrophthalic anhydride.

24. A high solids coating composition according to claim 16, wherein up to 50 percent by weight of said dicarboxylic acid anhydride employed in the preparation of said copolymer is selected from the group consisting of hexahydrophthalic anhydride, 2-dodecene-l-ylsuccinic anhydride, tetrahydrophthalic anhydride, methyl tetrahydrophthalic anhydride, camphoric anhydride, and mixtures thereof.

25. A high solids coating composition according to claim 16, wherein said epoxy contains two epoxide groups per molecule.

26. A high solids coating composition according to claim 16 or 25, wherein said epoxy is a saturated epoxy.

27. A high solids coating composition according to claim 26, wherein said epoxy contains terminal epoxide functionality.

28. A high solids coating composition according to claim 16, wherein said dicarboxylic acid anhydride consists of methyl hexahydrophthalic anhydride and said epoxy is a diepoxide.

29. A high solids coating composition according to claim 16, wherein said amine-aldehyde crosslinking agent is selected from the group consisting of condensation products of formaldehyde with melamine, substituted melamine, urea, benzoquanamine and substituted benzoquanamine and mixtures of said condensation products and is included in an amount sufficient to provide between about 0.75 and about 2.75 nitrogen crosslinking functional groups for each hydroxyl group initially present in said composition on said polyol (A).