The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 1977
Filed:
Nov. 20, 1975
Klaus Bruning, Bergisch-Gladbach, DT;
Karl-Gunter Sturm, St. Augustin, DT;
Siegfried Hahn, Siegburg-Kaldauen, DT;
Dynamit Nobel Aktiengesellschaft, Troisdorf, DT;
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.