[미국특허]
Coating compositions with branched phosphorous-containing resin
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C25D-005/34
C08G-059/14
C09D-005/44
출원번호
US-0344902
(2008-12-29)
등록번호
US-9206284
(2015-12-08)
발명자
/ 주소
Chouai, Abdellatif
December, Timothy S.
출원인 / 주소
BASF Coatings GmbH
대리인 / 주소
Servilla Whitney LLC
인용정보
피인용 횟수 :
0인용 특허 :
40
초록
An aqueous electrodeposition coating composition comprising a cathodically depositable binder, the binder comprising an branched phosphorylated resin, provides corrosion protection equivalent to that obtained by the conventional phosphate pretreatment-electrodeposition coating process.
대표청구항▼
1. A method of preparing an aqueous, cathodically electrodepositable coating composition, the method comprising: first reacting a polyepoxide resin having a plurality of epoxide groups with an extender having a secondary amine group or a primary amine group that has been protected by forming a ketim
1. A method of preparing an aqueous, cathodically electrodepositable coating composition, the method comprising: first reacting a polyepoxide resin having a plurality of epoxide groups with an extender having a secondary amine group or a primary amine group that has been protected by forming a ketimine, to form an extended polyepoxide resin;adding to the extended polyepoxide resin a —P(OR)2═O group-containing acid or acid derivative, wherein at least one R is a hydrogen atom or an alkyl group that has from one to four carbon atoms, to prepare a branched phosphorylated epoxy resin having a main chain resin backbone, and at least one branch point in the main chain resin backbone; andemulsifying the branched phosphorylated epoxy resin in water in the presence of a salting acid to prepare the aqueous cathodically electrodepositable coating composition. 2. The method according to claim 1, wherein the branched phosphorylated epoxy resin is amine-functional and has at least one amine group. 3. The method according to claim 2, wherein the aqueous, cathodically electrodepositable coating composition is free of epoxy resins other than the branched phosphorylated epoxy resin. 4. The method according to claim 2, further comprising, prior to emulsifying, combining the branched phosphorylated epoxy resin and a second resin that is amine-functional and has at least one amine group. 5. The method according to claim 1, wherein the branched phosphorylated epoxy resin comprises a monophosphate ester group, a monophosphonic acid ester group, or both. 6. The method according to claim 1, wherein the branched phosphorylated epoxy resin comprises a diphosphate ester group, a diphosphonic acid ester group, or both. 7. The method according to claim 1, wherein the branched phosphorylated epoxy resin comprises, on average, more than one phosphorous atom per molecule. 8. The method according to claim 1, wherein the polyepoxide resin is a diglycidyl ether of bisphenol A. 9. The method according to claim 1, wherein the branched phosphorylated epoxy resin comprises a triphosphate ester group. 10. The method of claim 1, wherein first reacting includes reacting the polyepoxide resin having a plurality of epoxide groups with the extender and a monofunctional reactant selected from the group consisting of a phenol, dimethylethanolamine, and a monoepoxide. 11. The method of claim 1, further comprising adding to the extended polyepoxide resin an amine having at least one active hydrogen. 12. The method of claim 1, wherein the extender is selected from the group consisting of diethanolamine, dipropanolamine, diisopropanolamine, dibutanolamine, diisobutanolamine, diglycolamine, methylethanolamine, dimethylaminopropylamine, and the ketimine of diethylenetriamine. 13. The method of claim 1, wherein the polyepoxide resin having a plurality of epoxide groups is reacted with an extender having at least two active hydrogen-containing groups at a temperature of about 25 ° C., and wherein the —P(OR)2═O group-containing acid or acid derivative is added at a temperature below about 50 ° C. 14. The method of claim 13, further comprising heating to a temperature in a range of 100 ° C. to about 125 ° C. to prepare the branched phosphorylated epoxy resin. 15. A method of preparing an aqueous, cathodically electrodepositable coating composition, the method comprising: first reacting a polyepoxide resin having more than two epoxide groups; with an extender having a secondary amine group or a primary amine group that has been protected by forming a ketimine, to form an extended polyepoxide resin;adding to the extended polyepoxide resin a —P(OR)2═O group-containing acid or acid derivative, wherein at least one R is a hydrogen atom or an alkyl group that has from one to four carbon atoms, to prepare a branched phosphorylated epoxy resin having a main chain resin backbone, at least one branch point in the main chain resin backbone, and at least one phosphorous-containing group having a structure wherein X is a hydrogen, a monovalent hydrocarbon group, an alkyl group, an aryl group, an alkylaryl group, an arylalkyl group, or an oxygen atom having a single covalent bond to a phosphorous atom, and at least one oxygen atom has a covalent bond to the branched phosphorylated epoxy resin; andemulsifying the branched phosphorylated epoxy resin in the presence of a salting acid to thereby prepare the aqueous cathodically electrodepositable coating composition. 16. The method according to claim 15, further comprising combining a crosslinker with the branched phosphorylated epoxy resin to form a binder. 17. The method according to claim 16, further comprising reacting a second, amine-functional resin with the crosslinker, wherein the second, amine- functional resin does not include phosphorous-containing groups. 18. A method of coating an unphosphated metal automotive vehicle body, the method comprising: first reacting a polyepoxide resin having more than two epoxide groups with an extender having a secondary amine group or a primary amine group that has been protected by forming a ketimine, to form an extended polyepoxide resin;adding to the extended polyepoxide resina —P(OR)2═O group-containing acid or acid derivative, wherein at least one R is a hydrogen atom or an alkyl group that is transesterifiable and has from one to four carbon atoms to prepare a branched phosphorylated epoxy resin having a main chain resin backbone, and at least one branch point in the main chain resin backbone;emulsifying the branched phosphorylated epoxy resin in the presence of a salting acid to prepare an aqueous cathodically electrodepositable coating composition;cleaning the unphosphated metal automotive vehicle body to form an unphosphated substrate;placing the unphosphated substrate into the aqueous cathodically electrodepositable coating composition; andconnecting the unphosphated substrate as a cathode in an electric circuit and passing a current through the aqueous cathodically electrodepositable coating composition to deposit a coating layer onto the unphosphated substrate and thereby coat the unphosphated metal automotive vehicle body. 19. The method according to claim 18, wherein cleaning is free of treating the unphosphated metal automotive vehicle body with a phosphate. 20. The method according to claim 18, wherein the branched phosphorylated epoxy resin comprises a phosphate ester of a polyepoxide resin, a phosphonic acid ester of a polyepoxide resin, or a combination thereof. 21. The method according to claim 18, wherein the branched phosphorylated epoxy resin comprises a diphosphate ester of an epoxy resin, a diphosphonic acid ester of an epoxy resin, or a combination thereof. 22. The method according to claim 18, wherein the branched phosphorylated epoxy resin comprises, on average, more than one phosphorous atom per molecule.
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