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WO1996014363B1 - Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition - Google Patents

Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition

Info

Publication number
WO1996014363B1
WO1996014363B1 PCT/US1995/012993 US9512993W WO9614363B1 WO 1996014363 B1 WO1996014363 B1 WO 1996014363B1 US 9512993 W US9512993 W US 9512993W WO 9614363 B1 WO9614363 B1 WO 9614363B1
Authority
WO
WIPO (PCT)
Prior art keywords
component
groups
phenolic hydroxyl
composition
beta
Prior art date
Application number
PCT/US1995/012993
Other languages
French (fr)
Other versions
WO1996014363A1 (en
Filing date
Publication date
Priority claimed from US08/334,712 external-priority patent/US5582704A/en
Application filed filed Critical
Priority to EP95938194A priority Critical patent/EP0789732B1/en
Priority to KR1019970702963A priority patent/KR100211079B1/en
Priority to CA002204434A priority patent/CA2204434C/en
Priority to AU38918/95A priority patent/AU691046B2/en
Priority to JP08515310A priority patent/JP3110047B2/en
Priority to DE69510951T priority patent/DE69510951T2/en
Publication of WO1996014363A1 publication Critical patent/WO1996014363A1/en
Publication of WO1996014363B1 publication Critical patent/WO1996014363B1/en
Priority to MXPA/A/1997/003240A priority patent/MXPA97003240A/en

Links

Abstract

An electrodepositable composition is provided comprising: (A) a non-gelled cationic resin which is derived from a polyepoxide and which contains in the resin molecule cationic salt groups and active hydrogen groups selected from aliphatic hydroxyl and primary and secondary amino; and present as a separate component; (B) a fully capped polyisocyanate curing agent containing substantially no free isocyanate groups. The electrodepositable composition contains from about 0.02 to 1.0 milliequivalents phenolic hydroxyl groups per gram of resin solids, and from about 0.1 to 2.0 milliequivalents beta-hydroxy ester groups per gram of resin solids. The composition provides excellent corrosion resistance when electrodeposited over steel substrates, and does not require lead in the formulation nor the use of a conventional chrome rinse for the steel substrate pretreatment before electrodeposition.

Claims

- 45 -
AMENDED CLAIMS
[received by the International Bureau on 15 May 1996 (15.05.96) ; new claims 36-46 added; remaining claims unchanged (4 pages)]
36. The composition of claim l or the method of claim 19 in which the electrodepositable composition further comprises a separate component (C) and a separate component (D) and the phenolic hydroxyl groups are present in one and the beta- hydroxy ester groups are present in the other; and (C) and (D) are different from (A) and (B) and from one another.
37. The composition of claim 1 or the method of claim 19 wherein the phenolic hydroxyl groups are present as unreacted phenolic hydroxyl groups in component (A) through reaction of polyhydric phenol with polyepoxide in chain extension with polyhydroxyl group-containing material where the polyhydric phenol is in a stoichiometric excess.
38. The method of claim 19, wherein the beta-hydroxy ester groups are present in component (A) through ring opening reaction of the 1,2-epoxide groups of the polyepoxide with a material having at least one carboxylic acid group.
39. The composition of Claim l or the method of claim 19 in which the phenolic hydroxyl groups are free unreacted phenolic hydroxyl groups in the electrodepositable composition.
40. The composition of Claim 1 or the method of claim 19 wherein the phenolic hydroxyl groups are present as free unreacted phenolic hydroxyl groups in component (B) by capping the isocyanate groups of the polyisocyanate with materials selected from the group consisting of: i) materials having an aliphatic and phenolic hydroxyl group, and ii) a hydroxyl functional epoxide which is further reacted with a stoichiometric excess of a polyhydric phenol.
41. The composition of Claim 1 or the method of claim 19, wherein the beta-hydroxy ester groups are present in component (B) through reaction of isocyanate groups of the polyisocyanate with a hydroxyl
AMENDED SHEET {ARTICLE 19) 46
group of a hydroxyl grou -containing carboxylic acid and reacting the acid group of the reacted hydroxyl group-containing carboxylic acid with an epoxy functional material to have ring opening of the 1,2- epoxide group of the epoxy functional material to form the beta- hydroxy ester groups.
42. The composition of Claim 10 or the method of claim 36 wherein the electrodepositable composition has present on a percent by weight basis of the weight of resin solids an amount of component (A) from 15 to 85, of component (B) from 15 to 85, of component (C) up to 30, and of component (D) up to 30.
43. The composition of Claim 1 or the method of claim 19 wherein in the electrodepositable composition the polyisocyanate is present in component (B) in an amount to provide 0.1 to about 1.2 capped isocyanate groups for each active hydrogen in the resin of component (A) , and component (A) has an equivalent ratio of reactants of epoxy to polyhydroxyl of from about 1.00:0.75 to 1.00:2.00 and has about 0.1 to 3.0 milliequivalent of cationic salt group per gram of resin solids.
44. A method of electrocoating an electroconductive substrate which serves as a cathode in an electrical circuit comprising said cathode and an anode immersed in an aqueous electrodepositable composition containing a cationic water dispersible resin, said method comprising passing an electric current between the anode and the cathode to cause the electrodepositable composition to deposit on the cathode as a substantially continuous film, and heating the electrodeposited film at an elevated temperature to cure the film, wherein the electrodepositable composition comprises:
(A) a cationic resin which is derived from a polyepoxide and which contains in the resin cationic salt groups and active hydrogen groups selected from aliphatic hydroxyl... primary amino, and secondary amino,- and - 47 -
present as a separate component
(B) a fully capped polyisocyanate curing agent containing substantially no free isocyanate groups; as separate from components (A) and (B) (C) a component selected from the group consisting of a component having phenolic hydroxyl groups to provide to said electrodepositable composition from about 0.02 to 1.0 milliequivalents phenolic hydroxyl groups calculated as
Figure imgf000005_0001
Formula 1
per gram of resin solids, and a component having beta-hydroxy ester groups to provide said electrodepositable composition from about 0.1 to 2.0 milliequivalents of beta-hydroxy ester groups calculated as
Figure imgf000005_0002
— CH— CH — O — C—
2 Formula 2
per gram of resin solids and a component having both the phenolic hydroxyl groups and the beta-hydroxy ester groups to provide said electrodepositable composition from about 0.02 to 1.0 milli¬ equivalents of phenolic hydroxyl groups as calculated from Formula (1) and about 0.1 to 2.0 milliequivalents of beta-hydroxy ester groups as calculated from Formula (2) , said electrodepositable composition being characterized as containing both from about 0.02 to 1.0 milliequivalents phenolic hydroxyl groups as calculated from Formula (1) per gram of resin solids, and from about 0.1 to 2.0 milliequivalents beta-hydroxy ester groups as calculated from Formula (2) per gram of resin solids.
45. The method of claim 44 in which the electrodepositable composition further comprises in addition to component (C) a separate 48
component (D) and the phenolic hydroxyl groups are present in one and the beta-hydroxy ester groups are present in the other; and (C) and (D) are different from (A) and (B) and from one another.
46. The method of claim 45 wherein the electrodepositable composition has present on a percent by weight basis of the weight of resin solids an amount of component (A) from 15 to 85, of component (B) from 15 to 85, of component (C) up to 30, and of component <D) up to 30.
PCT/US1995/012993 1994-11-04 1995-10-17 Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition WO1996014363A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP95938194A EP0789732B1 (en) 1994-11-04 1995-10-17 Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition
KR1019970702963A KR100211079B1 (en) 1994-11-04 1995-10-17 Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition
CA002204434A CA2204434C (en) 1994-11-04 1995-10-17 Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition
AU38918/95A AU691046B2 (en) 1994-11-04 1995-10-17 Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition
JP08515310A JP3110047B2 (en) 1994-11-04 1995-10-17 Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition
DE69510951T DE69510951T2 (en) 1994-11-04 1995-10-17 CATIONIC RESIN AND CAPPED POLYISOCYANATE AS A CROSS-LINKING AGENT SUITABLE FOR USE IN ELECTRIC DIP COATING
MXPA/A/1997/003240A MXPA97003240A (en) 1994-11-04 1997-05-02 Cationic resin and cured polyisocianate curing agent suitable for employment in electrodeposic

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/334,712 US5582704A (en) 1994-11-04 1994-11-04 Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition
US08/334,712 1994-11-04

Publications (2)

Publication Number Publication Date
WO1996014363A1 WO1996014363A1 (en) 1996-05-17
WO1996014363B1 true WO1996014363B1 (en) 1996-08-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/012993 WO1996014363A1 (en) 1994-11-04 1995-10-17 Cationic resin and capped polyisocyanate curing agent suitable for use in electrodeposition

Country Status (15)

Country Link
US (2) US5582704A (en)
EP (1) EP0789732B1 (en)
JP (2) JP3110047B2 (en)
KR (1) KR100211079B1 (en)
CN (1) CN1128849C (en)
AT (1) ATE182353T1 (en)
AU (1) AU691046B2 (en)
CA (1) CA2204434C (en)
DE (1) DE69510951T2 (en)
ES (1) ES2136884T3 (en)
MY (1) MY113409A (en)
TR (1) TR199501366A2 (en)
TW (1) TW339352B (en)
WO (1) WO1996014363A1 (en)
ZA (1) ZA958960B (en)

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