US 5,426,156 AGranted

Binder composition and its use in surface coatings

AssigneeHerberts GmbH

InventorsKlaus Bederke, Hermann Kerber, Walter Schubert, Gerhard Bremer, Thomas Brock, Fritz Sadowski

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Abstract

Previous two-component coatings with enamine components cured very slowly at low temperatures and led to yellowed products. A binder composition is prepared which cures rapidly at low temperatures and leads to non-yellowing products. It contains as CH-acid component a polymer with at least two enamine functions in the molecule, obtained by A) transesterification of a .beta.-keto-ester with hydroxyl-group-containing compounds or polymers which contain at least two hydroxyl groups in the molecule, with an OH value of at least 50 and a number-average molecular weight of 500 to 10,000, followed by reaction with ammonia or primary and/or secondary amines, and B) as .alpha.,.beta.-unsaturated component a compound with at least two groups of the general formula R.sub.1 R.sub.2 C.dbd.CR.sub.3 --X; in which X signifies --CO-- which is bonded via the residue of a di- or polyhydric alcohol, a di- or polyamine or an aminoalcohol to a further R.sub.1 R.sub.2 C.dbd.CR.sub.3 --X group, where R.sub.1, R.sub.2 and R.sub.3 signify hydrogen or an alkyl group, components A) and B) are present in the ratio 2:1 to 1:1.5 relative to their equivalent weights, the composition exists as a two-component system, and component A) contains a Lewis or Bronsted base as catalyst.

Claims8

Dependent claims

A two-component binder composition comprising primarily components (A) and (B) in the equivalent weight ratio of from 2:1 to 1:1.5,

(A) a CH-acid component that is a polymer with at least two enamine functions in the molecule and is obtained by transesterification of an aliphatic .beta.-ketocarboxylic acid ester, with one or more OH-containing reactants which have at least two-OH-groups in the molecule, the reactant having an OH value of at least 50 and a number-average molecular weight of from 500 to 10,000, the transesterification next including reaction with ammonia or a primary and/or secondary amine, in the presence of from about 0.01 to about 5% wt. based on the total composition of a Lewis or Bronsted base catalyst the conjugate acid of which has a minimum pKA of 10, and
(B) an .alpha.,.beta.-unsaturated compound containing at least two groups of the formula
R.sub.1 R.sub.2 C.dbd.CR.sub.3 X (I)
wherein X is --CO-- bonded through a member of the group consisting of a polyhydric alcohol, a polyamine, and an aminoalcohol residue to a further R.sub.1 R.sub.2 C.dbd.CR.sub.3 X group, and R.sub.1 R.sub.2 and R.sub.3 are independently of each other selected from the group consisting of a hydrogen atom, and a linear or branched chain C.sub.1-10 alkyl group which can have olefinic unsaturations, and/or one or more OH groups.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 08/341,450Filed 16 Nov 1994 · continuation
Priority: DE 39 32 517.229 Sep 1989
Granted: 20 Jun 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C08F 299/00
Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions
C08F 8/32
Introducing nitrogen atoms or nitrogen-containing groups: by reaction with amines
C08F 290/126
Polymers provided for in subclasses C08C or C08F: polymers of unsaturated carboxylic acids or derivatives thereof
C09D 4/06
Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable…:…