Abstract
The invention relates to coating material compositions for, for example, metallic, mineral substrates or for substrates of wood, paper and plastics, which comprise yellowing-resistant, low-viscosity, unsaturated, amorphous polyesters which are very largely free of benzene and formaldehyde, as a result of which the adhesion of these coating material compositions is improved even under critical ambient conditions, and to a preparation process and use of said compositions. More specifically, the invention relates to coating material compositions, substantially including 1, yellowing-resistant, low-viscosity, unsaturated, amorphous polyesters which are very largely free of benzene and formaldehyde; 2, at least one other adhesive; 3, at least one accessory ingredient and / or additive; 4, at least one colorant and / or stuffing. The yellowing-resistant, low-viscosity, unsaturated, amorphous polyesters are composed by the following components: I. acid components, made up of A) at least one alpha, beta-unsaturated dicarboxilic acid, and B) at least one linear and / or branch fatty group and / or alicyclic and / or aromatic bifunctional and / or polyfunctional carboxyl acid, which is not provided with alpha, beta-unsaturated part; II. alcohol components, made up of C) bis(hydroxymethyl)tricyclo compounds and D) at least one bifunctional and / or polyfunctional alcohol, wherein, based on the polyesters, the content of benzene is lower than 10mg / kg and the content of formaldehyde is lower than 10mg / kg, the molecular weight distribution polydispersity of the polyesters is 1.3-4.5, the content of tricyclodecane(mono- / di-)aldehyde in the bis(hydroxymethyl)tricyclo compound C) is lower than 2 weight percent; mono(hydroxymethyl)tricyclo [5.2.1.0<2,6>] decane in the compound C) is lower than 10 weight percent, and the content of chromium, nickel, copper, cadmium and plumbum in the compound C) is lower than 2mg / kg.
Description
technical field
[0001] The present invention relates to coating compositions for e.g. metal, mineral substrates or for wood, paper and plastic substrates comprising an anti-yellowing, low viscosity, unsaturated amorphous polyester which is substantially free of benzene and formaldehyde so that even The adhesion of these coating compositions is still improved under harsh environmental conditions, the invention also relates to a process for their preparation and their use. Background technique
[0002] Unsaturated polyester resins (UP resins) are known. They are prepared by condensing saturated and unsaturated dicarboxylic acids or their anhydrides with diols. Its properties largely depend on the nature and quantity ratio of raw materials.
[0003] As carriers for polymerizable double bonds, α,β-unsaturated acids are generally used, mainly maleic acid and / or its anhydride or fumaric acid; unsaturated diols are not critical. The higher the double bond content, in other words...
