Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1990-11-13
1992-08-04
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
52631842, C08F21208, C08F22032, C09D 380
Patent
active
051360047
DESCRIPTION:
BRIEF SUMMARY
The invention relates to binders containing copolymers containing hydroxyl groups and based on addition products of .alpha., .beta.-unsaturated acids and glycidyl esters, and also, .alpha., .beta.-unsaturated monomers with and without hydroxyl groups which can form mixed polymers. It also relates to the preparation of hydroxyl-group containing copolymers of this type and their use in clear and pigmented coating agents.
Copolymers containing hydroxyl groups and based on (meth)acrylates and reaction products of acrylic acid and glycidyl esters of .alpha.-alkylalkanemonocarboxylic acids and/or .alpha., .alpha.-dialkylalkane-monocarboxylic acids which can be processed with organic polyisocyanates to produce coating agents are known. German Auslegeschrift 16 68 510 describes copolymers of addition products of .alpha.,.beta.-ethylenically unsaturated acids and glycidyl esters and also, .alpha.,.beta.-unsaturated monomers with and without hydroxyl groups which can form mixed polymers. German Patentschrift 26 03 259 discloses cold-hardening paints which contain special binders of the type described generally in German Auslegeschrift 16 68 510. They are mixed polymers based on styrene, methylmethacrylate, hydroxyethylmethacrylate, acrylic acid and glycidyl esters of .alpha.-alkylalkanemonocarboxylic acids and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acids which are obtained by heating in inert solvents in the presence of polymerisation initiators, optionally using chain terminators with simultaneous esterification and polymerisation. These known coating agents do produce films which are resistant to solvents, water and weathering. However, films of this type do not have sufficient surface hardness whether they are dried at room temperature or lower temperatures. This negative property is particularly noticeable when used for repair paint coatings of vehicle bodies in the winter months. Even for force (30 minutes, 60.degree. C.) dried paint films, the assembly strength is only achieved after 4 hours. Furthermore, edge alignment occurs when paint coating vehicle bodies at sharp edges. The body of cold-hardening paints of this type is not adequate in grooves and beads.
The object of the invention is therefore the preparation of binders or clear or pigmented coating agents which give coatings having high gloss, good body, good flow and improved processing safety.
It has been shown that this object is achieved by preparing a binder which contains a copolymer containing hydroxyl groups based on addition products of .alpha.,.beta.-unsaturated acids and glycidyl esters and also .alpha.,.beta.-unsaturated monomers with and without hydroxyl groups which can form mixed copolymers, and which is characterised in that it consists essentially of a copolymer containing hydroxyl groups and which can be obtained from .alpha.-alkylalkanemonocarboxylic acids and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acids, in each case.
It has been shown that a binder of this type has an increased solids content at comparable viscosity or a lower viscosity at the same solids content, compared to the state of the art as shown in German Auslegeschrift 16 68 510 and in particular in German Patentschrift 26 03 259, when used with divalent and/or multivalent polyisocyanates. Furthermore, it has advantages for paint applications, such as improved gloss, body, flow, processing safety at high solid content.
The preparation of the copolymer of the invention can be carried out by polymerisation according to conventional processes, for example solid-state or solution polymerisation. These polymerisation processes are well known and described in: Houben-Weyl, Methoden der Organischen Chemie (Methods in Organic Chemistry), 4th edition, volume 14/1, pages 24-255 (1961).
The solution polymerisation process is preferred for the preparation of the copolymer of the invention. In this process, the solvents and the glycidyl esters of .alpha.-alkylalkanemonocarboxylic acids and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acids are placed in the reaction
Bederke Klaus
Kerber Hermann
Krumme Manfred
Sadowski Fritz
Stephan Werner
Herberts Gesellschaft mit beschrankter Haftung
Michl Paul R.
Szekely Peter
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