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| Haemofiltration with filtrate flow control by adjustable venting |
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Epoxide resin-modified polyester coat with alkyd topcoat
| Details |
Inventors: Gross, Lutz-Werner; Poth, Ulrich; Hille, Dieter; Weidemeier, Klaus;
Assignee: BASF Aktiengesellschaft (Munster, DE)
Primary Examiner: Sellers; Robert E.
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
A coating composition comprises an alkyd resin based topcoat and a water dilutable coating comprising an epoxy resin-modified polyester binder which is water-dilutable upon base neutralization of the free carboxyl groups and is prepared by the reaction of (A) a polyester containing (cyclo)aliphatic groups having at least six carbon atoms derived from (a.sub.1) a polycarboxylic acid with at least three carboxyl groups and/or (a.sub.2) a polyol with at least one carboxyl group, (a.sub.3) a polycarboxylic acid with two carboxyl groups and (a.sub.4) a polyol; and (B) a bisphenol epoxide resin. |
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DETAILED DESCRIPTION We claim: 1.
A coating composition applied to a substrate comprising an alkyd resin based topcoat and a water-dilutable coating for the production of a heat-curable coating containing a binder comprising an epoxide resin-modified, water-dilutable polyester produced by the reaction of: (A) a polyester having a number average molecular weight of less than 2000, an acid number of from 35 to 240, and an OH number of from 56 to 320, prepared by the reaction of: (a.
sub.
1) a polycarboxylic acid containing at least three carboxyl groups, or a derivative thereof; (a.
sub.
2) a polyol containing at least one carboxyl group other than components (a.
sub.
1), (a.
sub.
3) and (a.
sub.
4); (a.
sub.
3) a polycarboxylic acid containing two carboxyl groups, or a reactive derivative thereof, other than component (a.
sub.
2), and (a.
sub.
4) a polyol other than component (a.
sub.
2), such that at least 10 mol % of the sum of components (a.
sub.
1), (a.
sub.
2), (a.
sub.
3) and (a.
sub.
4) contains at least one (cyclo)aliphatic structural element having at least six carbon atoms, and wherein the (a.
sub.
1) and (a.
sub.
3) components are co-condensed via at least two carboxyl groups, and (B) from 0.
3 to 1.
5 equivalents per polyester molecule of an epoxide resin based on a bisphenol and having an epoxide equivalent weight of from 170 to 1,000, or a derivative thereof having at least one epoxide group per molecule, said reaction conducted under conditions in which essentially only carboxyl groups react with epoxide groups to produce an epoxide resin-modified polyester which is water-dilutable after at least part of the free carboxyl groups are neutralized.
2.
A coating composition according to claim 1 wherein from 30 to 70 mol % of the sum of polyester components (a.
sub.
1), (a.
sub.
2), (a.
sub.
3) and (a.
sub.
4) contains at least one (cyclo)aliphatic structural element having at least 6 carbon atoms.
3.
A coating composition according to claim 1 wherein polyester (A) has a number average molecular weight of from 500 to 1,500
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