Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1989-09-29
1994-07-19
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525157, 525161, 525163, 525164, 525187, 525190, 525208, 525221, 525222, 525232, 525241, 525227, C08L 6126, C08L 6124, C08L 3302
Patent
active
053310527
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a curable composition based on branched soluble acrylate copolymers which are obtainable by copolymerization of monomers having at least two polymerizable olefinic unsaturated double bonds, functional groups-carrying monomers, and additional polymerizable monomers with an olefinic unsaturated double bond.
From the class-forming EP-A 103 199 an acrylate copolymer is known which is obtained by copolymerization of 10 to 95 percent by weight of tert-butyl acrylate, 0.1 to 3 percent by weight of polyfunctional monomers such as, for example, trimethylolpropane-triacrylate, 1 to 30 percent by weight of monomers having a functional group, and 0 to 80 percent by weight of additional polymerizable ethylenic unsaturated monomers. As comonomers with a functional group are named inter alia carboxyl groups-containing monomers such as acrylic acid and methacrylic acid. From this publication, furthermore, a coating composition is known which contains a carboxyl groups-containing acrylate copolymer branched by polymerizing into it multiply ethylenic unsaturated monomers and a polyepoxide as cross-linking agent. The described branched acrylate copolymers lead to coatings with good resistance to weather, in particular good resistance to moisture which can be traced back to the content of monopolymerized tert-butyl acrylate.
From DE-P 30 22 996 is known an annealing lacquer in the case of which carboxyl groups-containing polymers, such as for example acrylates based on acrylic acid or methacrylic acid and glycidyl groups-containing acrylates can be mixed to form a curable composition. This leads to films with greater hardness and resistance to weather.
In WO 84/00771 a multi-component system is described in which a total of four types of binding agents or components are mixed with each other and then applied; the components are: anhydride,
No statements are made regarding the potlife of the mixture; particular advantage compared to conventional systems is said to be the high solid on application, partially greater than 70 percent solid matter.
In DE-OS 23 33 384 a binding agent based on acrylated polyesters is described, i.e. in an OH polyester (or alkyd resin) an OH acrylate is polymerized with relatively low acid number, wherein the cross linking can be carried out with melamine resins and simultaneously epoxide resins can be carried out. The proportions are: 60 to 70% OH copolymer, 20 to 30% melamine resin, 5 to 15% epoxide resin.
Advantages compared to existing systems are said to be: improved resistance to weather (therefore low-aroma acrylate), improved resistance to solvents and improved tendency of the lacquers to run on vertical surfaces.
The task of the present invention consisted in combining all positive properties of the known coating materials in a curable composition, in particular to achieve the porperties of the coating materials from the aspect of their resistance to long-term stress by solvents, chemicals, water or water vapor as well as to achieve simultaneously good hardness and elasticity. Furthermore, for reasons of economy a high solid content of the curable coating material is to be achievable at relatively low viscosity.
This task is solved, surprisingly, by a curable composition which consists of carboxyl groups-containing polymers, epoxide groups-containing polymers and aminoplastic resins, and wherein the epoxide component and/or the carboxyl component is based on a soluble branched acrylate copolymer which has a higher fraction of monopolymerized multiply ethylenic unsaturated monomers than the acrylate resin described in EP-A-103 199. In contrast to linear acrylate resins and the acrylate resins from EP-A-103 199 in the case of the acrylate copolymers according to the invention a lower viscosity at relatively high solid content can be achieved. Through the highly branched structure of the copolymer the functional groups of the acrylate resin become more reactive which carries with it a great advantage.
Subject matter of the present invention is a curable composition comp
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BASF Lacke & Farben AG
Clark W. Robinson H.
Seidleck James J.
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