Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-06-29
1996-07-16
Yoon, Tae
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525428, 525443, 525502, 525504, 525540, 524538, 524602, C08G 7306, C08L 7900
Patent
active
055367917
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to wire coatings containing polyesters based on tris-2-hydroxyethyl isocyanurate, organic solvents, catalysts, auxiliaries and additives. The present invention also relates to a process for the preparation of these wire coatings.
Wire coatings based on polyester resins are known and are described, for example, in U.S. Patent Specification 3,342,780, in U.S. Patent Specification 3,249,578 and in EP-B-144 281. The polyol component used in the said publications is tris-2-hydroxyethyl isocyanurate. The use of tris-2-hydroxyethyl isocyanurate (THEIC) in this context leads to particularly high softening temperatures of the wire coating layer or to a particularly high thermal pressure (IEC 851-6). The wires coated with wire coatings based on polyester resins are distinguished by the fact that the coating film possesses good adhesion to copper wires.
The disadvantage of the wire coatings based on polyester resins compared with wire coatings based on polyester-imide resins or polyamide-imide resins is that the wires coated with polyester coatings have a low thermal shock. THEIC-modified polyester wire coatings are therefore used as "base coat", onto which, for example, a polyamide-imide wire coating is applied, in two-coat coatings for wires.
The object on which the present invention is based was to provide wire coatings which overcome the disadvantages associated with polyester wire coatings and thus improve the spectrum of properties of the THEIC-polyester wire coatings. Said wire coatings should be stable on storage, possess good adhesion to Cu wires and have as high as possible a thermal pressure as well as an adequate thermal shock. Moreover, the wire coatings should have as high as possible a solids content coupled with a viscosity favorable for processing. The surface quality of the coated wires should be improved, in particular with regard to the hardness characteristics.
This object is achieved by means of wire coatings containing polyester based on tris-2-hydroxyethyl isocyanurate (THEIC), organic solvents, catalysts, auxiliaries and additives, characterized in that the wire coatings contain weight of the wire coating, which is 100% by weight.
It is surprising and was not foreseeable that wire coatings which adhere very well to copper wires and which lead to coatings having outstanding technological properties can be obtained by modifying THEIC polyester wire coatings with bismaleimide resins.
The individual components of the wire coatings according to the invention are now first explained in more detail below.
The polyesters modified with tris-2-hydroxyethyl isocyanurate (THEIC) (component a)) are known and are described, for example, in U.S. Patent Specification 3,342,780 and EP-B-144 281. The polyesters are prepared in a known manner by esterification of polybasic carboxylic acids with polyhydric alcohols in the presence of suitable catalysts. The alcohol components used are, inter alia, tris-2-hydroxyethyl isocyanurate.
In place of the free acid, it is also possible to use ester-forming derivatives thereof.
Alcohols suitable for the preparation of the polyesters are, for example, ethylene glycol, 1,2- and 1,3-propylene glycol, 1,2-1,3- and 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, diethylene glycol, triethylene glycol and also triols, such as, for example, glycerol, trimethylolethane, trimethylolpropane and tris2-hydroxyethyl isocyanurate. Mixtures of ethylene glycol and tris-2-hydroxyethyl isocyanurate are preferably used. The use of tris-2-hydroxyethyl isocyanurate leads to high softening temperatures of the coating layer.
Suitable carboxylic acids are, for example, phthalic acid, isophthalic acid, terephthalic acid and also the esterifiable derivatives thereof, such as, for example, the anhydrides, insofar as these exist, and the lower alkyl esters of the said acids, such as, for example, methyl, ethyl, propyl, butyl, amyl, hexyl and octyl phthalates, terephthalates and isophthalates. Both the half-esters and the dialkyl esters as well as mixtures of these com
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patent: 5084304 (1992-01-01), Lienert et al.
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Lienert Klaus W.
Peter Roland
Schink Michael
Schmidt Gerold
BASF Lacke & Farben AG
Sabourin Anne Gerry
Yoon Tae
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