Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1989-02-27
1993-01-12
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528291, 528292, 528296, 528297, 528308, 528332, 528335, 528340, 525420, 525423, 525424, C08G 6320
Patent
active
051791919
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to polycondensation and/or addition products containing carboxyl groups and amino groups, coating agents based on these polycondensation and/or addition products containing carboxyl groups and amino groups, and the use thereof.
It is known that compounds which contain an epoxy ring react with compounds containing carboxyl groups, with ring opening. When compounds containing more than one epoxy group and more than one carboxyl group are used, the reaction proceeds with formation of polymeric esters which contain secondary hydroxyl groups. This polymer formation is known under the term "acid-curing epoxy resins".
It is known that this epoxy-carboxy reaction can be catalyzed by suitable basic compounds. Suitable basic catalysts are, for example, diazabicyclooctane, diazabicyclononene, diazabicycloundecene, imidazole derivatives, such as 3-methyl-, phenyl- or cyclohexylimidazole, trialkylamines, such as triethyl-, tributyl- or tricyclohexyl-amine, N,N'-dialkylpiperazines, trialkyl- or triaryl-phosphines, hydroxides, carbonates and salts of organic acids of the alkali metals, such as lithium hydroxide, potassium carbonate, sodium benzoate and lithium benzoate. Further suitable catalysts are chelates of magnesium, aluminum and titanium.
EP-B-2,284 discloses a reactive, curable polymer mixture based on epoxy compounds and polycarboxylic acid units. By using polycarboxylic acids which are modified with primary amino groups, polycarboxylic acid units containing primary amino groups are obtained. The disadvantage in this case is the danger of gelling. In order to achieve low curing temperatures and short curing times, external catalysts are necessary.
EP-B-51,275 discloses a reactive, curable binder mixture based on epoxy compounds, polycarboxylic acid units based on polymerization and/or condensation products, and a catalyst component in the form of alkali metal and alkaline-earth metal salts of a polycarboxylic acid unit. The mixtures cure completely at room temperature or at slightly elevated temperature and can be used, in particular, for metal-effect paintwork. In this case, the curing catalyst is incorporated into the binder in the form of an alkali metal salt or an alkaline-earth metal salt. Although an internal catalyst is. involved in this case, incompatibility problems may occur.
EP-B-5,868 discloses a water-soluble reactive binder which can be obtained from cyclic polycarboxylic acid compounds, salt-forming substances, such as, for example organic bases, polymers containing hydroxyl groups, and epoxy compounds. The individual binder components can be present in chemically bound form. The mixtures cure at room temperature, and they are preferably used in the form of their aqueous solutions. Organic bases, such as, for example, tertiary amino compounds, cause the water-solubility of the binder system. In order to accelerate curing of the binder mixture, an external catalyst must be used, which is associated with severe problems with respect to compatibility.
The object of the present invention was to provide a coating agent based on acid-curing epoxy resins, where complete curing of the coating agent should occur at a sufficiently high rate and at the lowest possible temperatures. The films produced should have good or even improved properties in respect of hardness and elasticity. It should be possible to omit the use of an external catalyst in order to avoid incompatibility problems.
The invention relates to a polycondensation and/ or addition product containing carboxyl groups and amino groups, which can be obtained by reaction of monocarboxylic acids, a), b) and, if appropriate, c), which originate from component a) and/or b) and/or d), and the reaction product from a), b), if appropriate c) and if appropriate d) has an acid number from 5 to 200, preferably 10 to 130, and an amine number from 3 to 150, preferably 10 to 100.
Suitable polycarboxylic acids (component a) are, for example, phthalic acid, isophthalic acid, terephthalic acid, halophthalic acids, such as tetrachlor
REFERENCES:
patent: 3128265 (1964-04-01), Caldwell
patent: 3493414 (1970-02-01), Hastings
Gross Lutz-Werner
Heise Wilhelm
Jung Werner A.
Schmitz Arno
Vorbeck Udo
Acquah S. A.
BASF Lacke & Farben Aktiengesellschaft
Kight III John
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