US2014131213A1PendingUtilityA1

Electrodepositable coating compositions containing dialkyltin catalyst

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Assignee: PPG IND OHIO INCPriority: Nov 12, 2012Filed: Mar 11, 2013Published: May 15, 2014
Est. expiryNov 12, 2032(~6.3 yrs left)· nominal 20-yr term from priority
Inventors:Lorraine HsuKelly L. MooreMichael G. SandalaCraig A. Wilson
C09D 133/068C08G 59/4028C09D 5/4476C25D 9/02C25D 13/12C09D 163/00
57
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Claims

Abstract

An electrodepositable composition comprising: (a) an active hydrogen-containing, cationic salt group-containing resin, such as a (meth)acrylic sulfonium salt group-containing resin; (b) a capped polyisocyanate curing agent; and (c) a dialkyltin dicarboxylate or dimercaptide, in which one or both of the alkyl groups contain from 1 to 4 carbon atoms and one or both of the carboxylate and mercaptide groups contain from 8 to 12 carbon atoms.

Claims

exact text as granted — not AI-modified
1 . An electrodepositable composition comprising:
 (a) an active hydrogen-containing, cationic salt group-containing resin electrodepositable on a cathode;   (b) a capped polyisocyanate curing agent; and   (c) a dialkyltin dicarboxylate or dimercaptide; wherein one or more of the alkyl groups contain from 1 to 4 carbon atoms and wherein one or both of the carboxylates and the mercaptides contain from 8 to 12 carbon atoms.   
     
     
         2 . The electrodepositable composition of  claim 1  in which the active hydrogen-containing, cationic salt group-containing resin is derived from an epoxy-containing material. 
     
     
         3 . The electrodepositable composition of  claim 2  in which the epoxy-containing material is a polyglycidyl ether of a polyhydric alcohol. 
     
     
         4 . The electrodepositable composition of  claim 2  in which the epoxy-containing material is an epoxy-containing (meth)acrylic polymer. 
     
     
         5 . The electrodepositable composition of  claim 2  in which the cationic salt groups are amine salt groups or sulfonium salt groups. 
     
     
         6 . The electrodepositable composition of  claim 1  in which the dicarboxylate is dineodeconate. 
     
     
         7 . The electrodepositable composition of  claim 1  in which the dimercaptide is di(2-ethylhexyl mercaptoacetate) and/or di(isooctyl mercaptoacetate). 
     
     
         8 . The electrodepositable composition of  claim 1  in which the active hydrogen-containing, cationic salt group-containing resin is present in amounts of about 50 to 75 percent by weight, based on weight of resin solids. 
     
     
         9 . The electrodepositable composition of  claim 1  in which the capped polyisocyanate curing agent is present in amounts of about 25 to 50 percent by weight, based on weight of resin solids. 
     
     
         10 . The electrodepositable composition of  claim 1  in which the dialkyltin dicarboxylate or dialkyltin dimercaptide is present in amounts of about 0.01 to 1.5 percent tin by weight, based on weight of total solids of the electrodepositable composition. 
     
     
         11 . An electrodepositable coating composition comprising:
 (a) a cationic (meth)acrylic resin containing sulfonium salt groups;   (b) a capped polyisocyanate curing agent; and   (c) a dialkyltin dicarboxylate or dimercaptide wherein one or both of the alkyl groups contain from 1 to 4 carbon atoms and wherein one or both of the carboxylates and one or more of the mercaptides contain from 8 to 12 carbon atoms.   
     
     
         12 . The electrodepositable coating composition of  claim 11 , wherein the cationic (meth)acrylic resin is derived from an epoxy functional (meth)acrylic resin. 
     
     
         13 . The electrodepositable coating composition of  claim 11 , wherein the dicarboxylate is dineodeconate. 
     
     
         14 . The electrodepositable coating composition of  claim 11 , wherein the dimercaptide is di(2-ethylhexyl mercaptoacetate) and/or di(isooctyl mercaptoacetate). 
     
     
         15 . The electrodepositable coating composition of  claim 11 , wherein the dialkyltin dicarboxylate or dimercaptide is present in amounts of about 0.01 to 1.5 percent tin by weight, based on total weight of the electrodepositable composition. 
     
     
         16 . The electrodepositable coating composition of  claim 11 , wherein said cationic (meth)acrylic resin is present in amounts of about 50 to 75 percent by weight, based on weight of resin solids. 
     
     
         17 . The electrodepositable coating composition of  claim 11 , wherein the capped polyisocyanate is present in amounts of about 20 to 50 percent by weight, based on weight of resin solids. 
     
     
         18 . A method for electrocoating a substrate, comprising electrodepositing the composition of  claim 1  on the substrate. 
     
     
         19 . A method for electrocoating a substrate, comprising electrodepositing the composition of  claim 11  on the substrate. 
     
     
         20 . The electrodepositable coating composition of  claim 1  in which both alkyl groups are methyl. 
     
     
         21 . The electrodepositable coating composition of  claim 11  in which both alkyl groups are methyl 
     
     
         22 . A method for electrocoating a substrate, comprising electrodepositing the composition of  claim 20  on the substrate. 
     
     
         23 . A method for electrocoating a substrate, comprising electrodepositing the composition of  claim 21  on the substrate.

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