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1. WO1993017368 - REVETEMENTS PERMANENTS FLEXIBLES POUVANT ETRE PHOTOGRAVES, ET TRAITES A L'EAU, POUR CIRCUITS INTEGRES

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

[ EN ]

What is claimed is:
1. An aqueous processable, photopolymerizable, permanent coating composition, that is pliable and can withstand molten solder after cure, which comprises:
(a) at least one copolymeric binder containing at least one structural unit A and at least one additional structural unit Bl or B2 containing carboxyl groups, wherein:
(I) 5 to 50 percent by weight of the copolymer is formed from at least one different structural unit B1, B2 or combinations thereof containing carboxyl groups,
(II) 50 to 95 percent by weight of the copolymer is formed from structural unit A, wherein A is different from structural units B1 and B2,
(III) A, B1 and B2 have the structures:





in which:
R1 is H, alkyl, phenyl and alkylphenyl;
R2 is H, CH3, phenyl, -COOR7, -CONR8R9 and -CN;
R3 and R4 independently are H and alkyl;
R5 is alkyl or aryl which is unsubstituted or
substituted with primary amino, secondary amino,
tertiary amino, hydroxy or ether groups or
mixtures thereof;
R6 is -OH and NHR5;
R7 R8 and R9 independently are H, alkyl and
aryl, which is unsubstituted or substituted with
one or more hydroxy, ester, keto, ether or
thioether groups .
(b) a monomeric component which is an acrylated urethane;

(c) a photoinitiator or a photoiniator system; and
(d) a thermal crosslinking agent.

2. The permanent coating composition of Claim 1 wherein the copolymer binder (a) is the reaction product of a primary amine with a copolymer formed from at least one ethylenically unsaturated dicarboxylic acid
anhydride-and at least one ethylenically unsaturated comonomer.

3. The permanent coating composition of claim 2 wherein the ethylenically unsaturated dicarboxylic acid anhydride is selected from a group consisting of maleic acid anhydride, itaconic acid anhydride, citraconic acid anhydride and mixtures thereof.

4. The permanent coating composition of claim 2 wherein the primary amine is selected from a group consisting of an alkyl amine and an aryl amine,
unsubstituted or substituted wherein substituents are primary amino, secondary amino, tertiary amino, hydroxy or ether groups, or mixtures thereof.

5. The permanent coating composition of claim 2 wherein the ethylenically unsaturated comonomer is selected from the group consisting of styrene,
(meth) acrylic acid, (meth)acrylamide, (meth)acrylate alkylester, and mixtures thereof.

6. The permanent coating composition of claim 1 wherein the acrylated urethane has the structure:


wherein n is at least one; Q1 is an aromatic group; Q2 and Q3 are independently polyoxyalkylene containing 1 to 10 carbon atoms; Q4 is an aromatic group which is different than Q1; Q5 and Q6 are independently alkyl of 1 to 3 carbon atoms or H.

7. The permanent coating composition of claim 1 wherein the monomeric component further comprises a comonomer.

8. The permanent coating composition of claim 7 wherein the comonomer is selected from the group consisting of hydroxy C1-C10-alkyl acrylate,
hexamethylene glycol diacrylate, triethylene glycol diacrylate, tripropylene glycol diacrylate,
pentaerythritol triacrylate, trimethylolpropane triacrylate, polyoxyethylated trimethylolpropane triacrylate, di-(3-acryloxy-2-hyrdoxyproρyl) ether of bisphenol-A, di-(3-acryloxy-2-hydroxyproρyl) ether of tetrabromo-bisphenol-A, and methacrylate analogues thereof.

9. The permanent coating composition of claim 1 wherein the thermal crosslinker is a monomeric or polymeric aldehyde condensation product.

10. The permanent coating composition of claim 9 wherein the thermal crosslinker is methylolether substituted melamine.

11. The permanent coating composition of claim 10 wherein the melamine ether is hexamethoxymethyl-melamine.

12. The permanent coating composition of claim 9 wherein the thermal crosslinker is a formaldehyde condensation product with a compound selected from the group consisting of a melamine, a urea, or a
benzoguanamine.

13. The permanent coating composition of claim 12 wherein the thermal crosslinker is a butyl ether of the formaldehyde condensation product with melamine.

14. The permanent coating composition of claim 1 wherein a coating of 10 to 125 microns on a printed circuit substrate when exposed to actinic radiation and a subsequent cure has the ability to withstand thermal shock according to Military Specification Mil-P-55110D.

15. The permanent coating composition of claim 1 wherein a coating of 10 to 125 microns of a flexible printed circuit substrate when exposed to the actinic radiation, a subsequent cure and accelerated aging has the ability to withstand at least one of fold and crease flexibility test and a cross-hatch adhesion test, both before and after molten solder immersion exposure.

16. The permanent coating composition of claim 15 wherein the composition further comprises a cobinder.

17. A flexible printed circuit comprising:
a) a flexible substrate;
b) an electrically conductive circuit pattern on at least one side of the flexible substrate; and
c) a permanent coating composition applied over the electrically conductive circuit pattern to form the outermost layer which coating composition is cured wherein the coating composition comprises: (a) a copolymeric binder containing structural unit A and structural unit B1 or B2 containing carboxyl groups, wherein:
(I) 50 to 95 percent by weight of the
copolymer is formed from structural unit A.
(II) 5 to 50 percent by weight of the
copolymer is formed from at least one different
structural units B1, B2 or combinations thereof
containing carboxyl groups, the level of which is determined for a given composition by optimizing the amount needed for good development in aqueous alkaline developer,
(III) A, B1 and B2 have the structures:




in which:
R1 is H, alkyl, phenyl and alkylphenyl;
R2 is H, CH3, phenyl, -COOR7, -CONR8R9 and -CN;
R3 and R4 is H and alkyl;
R5 is alkyl or aryl which is unsubstituted or
substituted with primary amino, secondary amino,
tertiary amino, hydroxy or ether groups or
mixtures thereof;
R6 is -OH and NHR5;
R7 R8 and R9 independently are H, alkyl and
aryl, which is unsubstituted or substituted with
one or more hydroxy, ester, keto, ether or
thioether groups,
(b) a monomeric component which is an acrylated urethane; (c) a photoinitiator or a photoiniator system; and
(d) a thermal crosslinking agent, and
wherein the coating of 10 to 125 microns on a flexible printed circuit substrate when exposed to actinic
radiation, a subsequent cure and accelerated aging has the ability to withstand at least one of fold and
crease flexibility test and a cross-hatch adhesion test, both before and after molten solder immersion exposure .

18. A printed circuit of claim 17 further
comprising a rigid substrate, an electrically conductive circuit pattern on at least one side wherein the
permanent coating composition is the outermost layer.

19. The printed circuit of claim 18 wherein the rigid substrate is adjacent to the outermost layer.

20. The printed circuit of claim 18 wherein the flexible substrate is adjacent to the outermost layer.

21. The permanent coating composition of claim 16 with a binder comprising of from 2,000 to 10,000 molecular weight resin of a reaction product of a primary amine with a copolymer formed from at least one ethylenically unsaturated dicarboxylic acid anhydride and at least one ethylenically unsaturated comonomer, and from 50,000 to 500,000 molecular weight carboxylic acid-containing copolymer.

22. The flexible printed circuit of claim 17 with the permanent coating comprising a binder and mixture of from 2,000 to 10,000 molecular weight resin of a reaction product of a primary amine with a copolymer formed from at least one ethylenically unsaturated dicarboxylic acid anhydride and at least one
ethylenically unsaturated comonomer, and from 50,000 to 500,000 molecular weight carboxylic acid-containing copolymer.