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Method of producing electrically insulating, highly flexible and/or solderable coatings

  • US 4,239,814 A
  • Filed: 08/31/1978
  • Issued: 12/16/1980
  • Est. Priority Date: 09/19/1977
  • Status: Expired due to Term
First Claim
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1. A method of producing electrically insulating highly flexible and/or solderable coatings on electrical conductors or fibre materials which comprise(A) coating said conductor or fibre material with a solution comprising:

  • (i) isocyanates masked with compounds having reactive hydrogen atoms in the molecule and selected from the group consisting of acid amides having 1 or 2 amide hydrogen atoms, hydroxylamine, reaction products of hydroxylamine with carbonyl compounds, imines having an imine hydrogen atom, and lactams with melting or sublimation points below 25°

    C.;

    (ii) polyester resins and modified polyester resins selected from the group consisting of imide-modifed polyester resins, amide-modified polyester resins and mixtures thereof, said polyester resins and modified polyester resins having a content of terminal hydroxyl groups of from 1 to 16% by weight and being derived from compounds selected from the group consisting of polyhydric alcohols, aliphatic carboxylic acids, polybasic carboxylic acids having carboxyl groups bonded to an aromatic ring, and amino group containing compounds; and

    (iii) solvents having from 1 to 10 carbon atoms, a boiling point of at most 250°

    C. and being selected from the group consisting of araliphatic ketones, aliphatic ketones, araliphatic alcohols, aliphatic alcohols, ether oxygen-containing araliphatic alcohols, ether oxygen-containing aliphatic alcohols, aliphatic keto-alcohols, araliphatic keto-alcohols, esterified aliphatic alcohols, and esterified aliphatic alcohols, and(B) heating to a working temperature of above 140°

    C.

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