US 5,965,205 AGranted

Composition and process for treating tinned surfaces

AssigneeHenkel Corporation

InventorMasayuki Yoshida

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Abstract

This invention relates to a process comprising the steps of contacting a metal surface with an aqueous composition comprising water and specific amounts by weight of phosphate ions, condensed phosphate ions and water soluble polymer molecules of a specific general formula, separating the contacted metal surface from the aqueous composition, rinsing with water and heating.

Claims20

Dependent claims

A process for treating a tinned metal surface in order to form on said surface a corrosion protective, paint adherent coating, said process comprising steps of:

(I) bringing the metal surface being treated into contact with an aqueous liquid coat-forming composition having a pH of not more than 6.0 and comprising water and:
(A) from 0.5 to 30 parts by weight of phosphate ions;
(B) from 0.1 to 10 parts by weight of condensed phosphate ions;
and
(C) from 0.1 to 20 parts by weight of water-soluble polymer molecules conforming to the following general formula (1):
##STR5## in which (i) each of X.sup.1 and X.sup.2, independently of each other and independently from one unit of the polymer, which is defined as a part of the polymer that conforms to formula (I) above except that the square brackets and the subscript n are omitted, to another unit of the polymer, represents a hydrogen atom, a C.sub.1 to C.sub.5 alkyl group, or a C.sub.1 to C.sub.5 hydroxyalkyl group;
(ii) each of Y.sup.1 and Y.sup.2, independently of one another and independently from one unit of the polymer to another, represents a hydrogen atom or a moiety "Z" that conforms to one of the following formulas (II) and (III):
##STR6## wherein each of R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5, independently of each other and independently from one unit of the polymer to another, represents a C.sub.1 to C.sub.10 alkyl group or a C.sub.1 to C.sub.10 hydroxyalkyl group;
(iii) the moiety Z bonded to any single phenyl ring in the polymer molecule may be identical to or may differ from the moiety Z bonded to any other phenyl ring in the polymer molecule;
(iv) the average value over component (C) as a whole for the number of Z moieties substituted on each phenyl ring in the polymer molecule is from 0.2 to 1.0;
and (v) n is a positive integer with an average value over component (C) as a whole from 2 to 50,
so as to convert the metal surface contacted to a coated metal surface;
(II) separating the coated metal surface formed in step (I) from the aqueous liquid coat-forming composition with which it was contacted in step (I) and thereafter rinsing the coated metal surface with water to produce a rinsed coated metal surface;
and
(III) heating the rinsed coated metal surface sufficiently to dry said surface and form a dry coated metal surface.

12 more elements

Dependencies are inferred from the claim text.

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Abstract

A process for treating a tinned metal surface in order to form on said surface a corrosion protective, paint adherent coating, said process comprising steps of:

(I) bringing the metal surface being treated into contact with an aqueous liquid coat-forming composition having a pH of not more than 6.0 and comprising water and:
(A) from 0.5 to 30 parts by weight of phosphate ions;
(B) from 0.1 to 10 parts by weight of condensed phosphate ions;
and
(C) from 0.1 to 20 parts by weight of water-soluble polymer molecules conforming to the following general formula (1):
##STR5## in which (i) each of X.sup.1 and X.sup.2, independently of each other and independently from one unit of the polymer, which is defined as a part of the polymer that conforms to formula (I) above except that the square brackets and the subscript n are omitted, to another unit of the polymer, represents a hydrogen atom, a C.sub.1 to C.sub.5 alkyl group, or a C.sub.1 to C.sub.5 hydroxyalkyl group;
(ii) each of Y.sup.1 and Y.sup.2, independently of one another and independently from one unit of the polymer to another, represents a hydrogen atom or a moiety "Z" that conforms to one of the following formulas (II) and (III):
##STR6## wherein each of R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5, independently of each other and independently from one unit of the polymer to another, represents a C.sub.1 to C.sub.10 alkyl group or a C.sub.1 to C.sub.10 hydroxyalkyl group;
(iii) the moiety Z bonded to any single phenyl ring in the polymer molecule may be identical to or may differ from the moiety Z bonded to any other phenyl ring in the polymer molecule;
(iv) the average value over component (C) as a whole for the number of Z moieties substituted on each phenyl ring in the polymer molecule is from 0.2 to 1.0;
and (v) n is a positive integer with an average value over component (C) as a whole from 2 to 50,
so as to convert the metal surface contacted to a coated metal surface;
(II) separating the coated metal surface formed in step (I) from the aqueous liquid coat-forming composition with which it was contacted in step (I) and thereafter rinsing the coated metal surface with water to produce a rinsed coated metal surface;
and
(III) heating the rinsed coated metal surface sufficiently to dry said surface and form a dry coated metal surface.

12 more elements