Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-03-30
1996-01-09
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253294, 525386, C08F22606, C08F22060
Patent
active
054830044
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an acrylate copolymer which contains amino groups, carboxyl groups and, if appropriate, hydroxyl groups and is obtainable by copolymerization in an organic solvent at temperatures between 80.degree. and 150.degree. C., using polymerization initiators and using at least one ethylenically unsaturated monomer having a tertiary amino group.
The present invention also relates to a process for the production of these acrylate copolymers and to their use.
Acrylate copolymers which contain amino groups and carboxyl groups are known and are used, for example, as binders in coating agents which contain epoxide resins as curing agents. The amino groups present in the binder then catalyze the carboxy/epoxy reaction taking place during the curing of these coating agents.
Thus, such coating agents based on polyepoxides and on branched acrylate resins containing carboxyl groups and amino groups are known, for example, from WO 87/02,041, the amino groups being introduced into the acrylate resin by producing the acrylate resin with the use of ethylenically unsaturated monomers having a tertiary amino group or by reacting the acrylate resin with compounds which, in addition to at least one tertiary amino group, contain a group which is reactive with the functional groups of the acrylate resin.
These coating agents cure at room temperature or slightly elevated temperature and lead to coatings having good technical properties, but the high color number of the coating agents containing acrylate resins based on the monomers containing amino groups is a disadvantage in the use of the coating agents, especially as a clearcoat.
Moreover, Published Application JP 219,267/83 has disclosed a coating agent which, in addition to a polyepoxide component and a carboxylic acid activated by double bonds and/or hydroxyl groups, contains an acrylate copolymer which has been produced by copolymerization of acrylic monomers having a tertiary amino group, acrylic or methacrylic acid esters and, if appropriate, further monomers. These coating agents cure at room temperature or slightly elevated temperature by means of a reaction of the epoxide groups with the amino groups as lead to coatings having good technical properties. In spite of the use of monomers containing amino groups in the preparation of the acrylate copolymers, no brown coloration of the acrylate solution occurs even after prolonged storage, and this is achieved by the addition of the activated carboxylic acid. A disadvantage of these coating agents known from Published Application JP 219,267/83 is, however, that the addition of the activated carboxylic acid entails a deterioration of the weathering resistance of the resulting coatings.
Japanese Patent Specification 59-36,666 has disclosed a coating agent which is obtainable by mixing acrylate copolymers of acrylic acid esters, monomers containing carboxyl groups and acrylic monomers containing a tertiary nitrogen atom, such as, for example, diethylaminoethyl acrylate, with polyepoxides. These coating agents can be cured at low temperatures and have a high solids content. The disadvantage of these systems is the high color number of the copolymers and the yellowing of the coatings under UV exposure, for example in the QUV test.
Furthermore, Published Application JP 114,838/78 has also disclosed coating agents based on an acrylate copolymer which is obtainable by copolymerization of 0.2 to 10% by weight of acrylic monomers containing a tertiary nitrogen atom, 35 to 99.7% by weight of alkyl (meth)acrylate monomers and 0.1 to 20% by weight of monomers containing hydroxyl groups. The use of vinylimidazole dimethylaminopropylmethacrylamide as amine monomer is not described in Published Application JP 53-114,838. Moreover, these coating agents do not cure via a carboxy/epoxy reaction, but via an epoxy/amine reaction. The disadvantage of these systems is the low crosslinking density.
From German Offenlegungsschrift 3,322,830, coating agents curing at low temperatures are also known which, as binders, cont
REFERENCES:
patent: 4104227 (1978-08-01), Boessler et al.
patent: 5077187 (1991-12-01), Factor et al.
Brunnemann Michael
Hoffmann Peter
BASF Lacke & Farben AG
Cheng Wu C.
Sabourin Anne Gerry
Schofer Joseph L.
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