Enameling lacquer, process for the manufacture of the lacquer and application of the lacquer to enameling wires
AssigneeAlcatel
InventorsRaymond Andre, Jean-Yves Barraud, Germaine Binder, Jean-François Fauvarque, Pierre-Yves Le Tiec, Laurent Preux
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Abstract
An enameling lacquer comprises a base first polymer and a copolymer which is compatible with said first polymer and which contains polymeric chains selected from polysiloxanes, fluorated chains and alkane chains. The lacquer is of particular application to an enameled wire comprising at least one layer of an enamel obtained by reticulation of the lacquer.
Claims17
An insulating enameling lacquer for enameled conductors comprising a polymer blend of a base first polymer, a second polymer and a copolymer, wherein:
- the base first polymer is selected from the group consisting of:
- polyurethane, polyamide, polyamide imide, polyester, polyester imide, polyester amide-imide, polyamide, acetal of polyvinyl alcohol, polyepoxy compounds and polyphenoxy compounds;
- the second polymer is selected from the group consisting of polysiloxanes;
- said second polymer is present in the blend in a quantity of at least 0.3% but less than 30% by weight;
- and
- the copolymer is compatible with said first polymer, is distinct from the first and second polymers, and contains polymeric chains selected from polysiloxanes, said copolymer is present in the blend in a quantity between 0.5% and 20% by weight and acts as a compatibilizing agent between the first and second polymer to thereby create said polymer blend.
A process for the production of an insulating enameling lacquer in the form of a polymer blend comprising a base first polymer selected from the group consisting of:
- polyurethane, polyamide, polyamide imide, polyester, polyester imide, polyester amide-imide, polyamide, acetal of polyvinyl alcohol, polyepoxy compounds and polyphenoxy compounds;
- a second polymer selected from among polysiloxanes;
- and a copolymer which is compatible with said first polymer, which is distinct from the first and second polymers, which serves as a compatibilizing agent between the first and second polymers to thereby create said polymer blend, and which contains polymeric chains selected from polysiloxanes;
- said process comprising the steps:
- producing a copolymer containing polysiloxane functions grafted onto a polymer selected from the group consisting of:
- polyamide imide, polyester, polyester imide, polyester amide-imide, polyamide, polyamide and polyurethane, by first reacting a functionalized polysiloxane with a diisocyanate wherein one isocyanate function has been blocked and then grafting the blocked NCO polysiloxane onto said first polymer, and
- adding the copolymer thus produced to the base first polymer and the second polymer to form a polymer blend in which the second polymer is present in a quantity between 7.2% and 20% by weight and the copolymer is present in a quantity between 0.5% and 20% by weight.
An enameled wire which comprises an external layer of an enamel in the form of a polymer blend obtained by reticulation of an enameling lacquer, said enameling lacquer comprising
- a base first polymer selected from the group consisting of:
- polyurethane, polyamide, polyamide imide, polyester, polyester imide, polyester amide-imide, polyamide, acetal of polyvinyl alcohol, polyepoxy compounds and polyphenoxy compounds;
- a second polymer selected from among polysiloxanes and present in the blend in a quantity of at least 0.3% but less than 30% by weight, and a copolymer which is compatible with said first polymer, which is distinct from the first and second polymers, which serves as a compatibilizing agent between the first and second polymers to thereby create said polymer blend, and which contains polymeric chains selected from polysiloxanes, with said copolymer being present in the blend in a quantity between 0.5% and 20% by weight and acting as a compatibilizing agent between the first and second polymer to thereby create said polymer blend.
Dependencies are inferred from the claim text.