Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1998-05-14
1999-12-28
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528121, 528370, 427386, 4274071, 427410, C08G 5944, C08G 6400
Patent
active
06008314&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to epoxide-aminourethane addition products, and to coating media based on aqueous epoxide systems which contain the epoxide-aminourethane addition products as hardeners. The invention also relates to the use of the epoxide-aminourethane addition products for multi-layer coating, particularly in the field of coating vehicles and vehicle parts.
BACKGROUND OF THE INVENTION
Due to environmental protection regulations becoming more and more stringent, aqueous systems for the coating of articles are becoming increasingly important. The properties of these systems, have to measure up to those of conventional, i.e. solvent-containing, systems. Amongst coldhardening "aqueous lacquers", water-thinnable epoxide resin systems have become increasingly important. These two-component (2C) systems have outstanding properties. The following advantageous properties should be emphasised: no solvent content or only a low solvent content, non-inflammable, no or little odour, easily worked, low sensitivity to wet coats underneath, good drying properties and rapid hardening throughout, very good adhesion to most substrates, very good intermediate coat adhesion, good protection of metals from corrosion and ease of cleaning of operating devices directly after use.
Thus non-ionically dispersed epoxide resin systems in particular, such as those described in DE-A-36 43 751, with aqueous amine-based hardeners such as those disclosed in EP-A-0 000 605, exhibit many of these outstanding properties, so that they have diverse uses as coating media. A disadvantage of these systems, however, is that they do not produce defect-free surfaces for certain lacquer applications.
EP-A-0 387 418 describes hardeners for aqueous epoxide systems, which are produced by the reaction of polyalkylene polyether polyamines with polyepoxide compounds and by reacting the epoxide-functional product which is obtained with primary or secondary polyamines to form an amine-functional final product. These systems are particularly suitable for the production of sealing compositions, adhesives, mouldings and laminates. When used as a primer surfacer or primer coat in a multi-layer coating they have the disadvantage of an unsatisfactory rubbing-down capacity. Due to their pronounced thermoplasticity, the abrasive paper becomes clogged after a short time and the surface is damaged. Moreover, an unsatisfactory resistance to run-off is obtained with these coating media.
DE-A43 44 510 describes aqueous coating media comprising epoxide-based binder vehicles and aminourethane-based hardeners. Coatings produced from these coating media can in fact be rubbed down, but it has been shown that the surface quality is unsatisfactory. The surface quality can in fact be improved by the addition of water-thinnable polyurethane resins, but this is again achieved at the cost of the rubbing-down capacity.
SUMMARY OF THE INVENTION
The object of the present invention was therefore to provide amine hardeners for aqueous epoxide systems, which impart a satisfactory processing time and a high resistance to run-off to coating media produced from them, and which result in coatings having defect-free surfaces and a good rubbing-down capacity in the dry and wet states.
It has been shown that this object is achieved by amine-functional epoxide-aminourethane addition products, hereinafter called aminourethane hardeners. Therefore, the present invention firstly relates to aminourethane hardeners which are suitable for aqueous epoxide-based coating media and which are obtainable by the reaction of 2-oxo-1,3-dioxane group, hereinafter denoted as a cyclic carbonate group, with the ratio of the number of cyclic carbonate groups to the number of primary amine groups is 1:10 to 1:1.1, with the reaction of and/or secondary .alpha.-amino group and an .omega.-alkyl ether or aryl ether group and/or one or more polyalkylene polyethers comprising two primary and/or secondary .alpha.,.omega.-amino groups, each with a weight average molecular weight (Mw) of 20
REFERENCES:
patent: 4122069 (1978-10-01), Meyer
patent: 4197389 (1980-04-01), Becker et al.
patent: 4198389 (1980-04-01), Becker
patent: 4806611 (1989-02-01), Hoenel et al.
patent: 4835289 (1989-05-01), Brindopke
patent: 4886845 (1989-12-01), Becker et al.
patent: 4892954 (1990-01-01), Brindopke
patent: 5032629 (1991-07-01), Hansen
patent: 5123458 (1992-06-01), Hoenel et al.
patent: 5596030 (1997-01-01), Walker et al.
patent: 5677006 (1997-10-01), Hoenel et al.
patent: 5707741 (1998-01-01), Hoenel
patent: 5855961 (1999-01-01), Hoenel et al.
Besold Robert
Collong Wilfried
Lenhard Werner
Neumann Uwe
Herberts GmbH
McClendon Sanza L.
Seidleck James J.
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