Coating powders on the basis of thermoplastic polyesters

Details Coating powders on the basis of thermoplastic polyesters Coating powders on the basis of thermoplastic polyesters

1975-11-20

1977-10-18

Smith, Ronald H.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427185, 427195, B05D 104, B05D 106, B05B 500

Patent

active

040546810

ABSTRACT:
An improvement in a process for coating a substrate by a powder coating process wherein a polyester powder is applied to said substrate which improvement comprises using as the polyester powder a partially crystalline powder of a polyester condensation product of an acid component comprising an acid or ester of at least terephthalic acid and a diol component at least 50 molar percent of which is 1,4-butanediol; a polyester coating powder which is a partially crystalline polyester of an acid component at least part of which is an acid or ester of terephthalic acid and a diol component at least 50 molar percent of which is 1,4-butanediol, said powder having a glass transition temperature between -20.degree. and +50.degree. C., measured as the attenuation maximum in accordance with Deutsche Industrie Norm 53,445 a reduced n.sub.red viscosity of at least 0.6, measured in a 1 weight percent solution of a mixture of 60 parts by weight phenol and 40 parts by weight phenol and 40 parts by weight 1,1,2,2-tetrachloroethane at 25.degree. C. and a melting maximum, determined by differential thermoanalysis, of about 150.degree. to 200.degree. C.

REFERENCES:
patent: 3232813 (1966-02-01), Newton
patent: 3423281 (1969-01-01), Wiener
patent: 3505293 (1970-04-01), Bond et al.
patent: 3682863 (1972-08-01), McHale
patent: 3864314 (1975-02-01), Modler et al.
patent: 3868338 (1975-02-01), Parsons et al.

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