Plastisols which prevent the yellowing of top coats, process for their preparation and use
AssigneeTeroson GmbH
InventorsBernhard Koesters, Xaver Muenz, Manfred Asang
Life of this patent
Estimating the term…
Abstract
The invention relates to plastisols which prevent a yellowing of top coats applied thereon, to a process for their preparation and to their use. The plastisols based on PVC or methacryl contain, in addition to basic adhesion promoters, aldehydes, ketones, their derivatives, oligomers or mixtures of same.
Claims8
The method of inhibiting yellow-discoloration of a top coat applied to steel or steel parts primed with an electro-dip coat, comprising applying to said primed steel or steel parts a plastisol component selected from the group consisting of polyvinylchloride, polymethacrylate, and copolymers thereof,
- a plasticizer,
- at least one basic adhesion promoter, and
- at least one non-yellowing additive selected from the group consisting of:
- (a) aldehydes,
- (b) ketones,
- (c) hexamethylenetetramine, and
- (d) mixtures of (a) and (b) or (a) and (c) or (b) and (c) or (a) and (b) and (c).
The method of inhibiting yellow-discoloration of a top coat applied to steel or steel parts primed with an electro-dip coat, comprising adding to a polyvinylchloride or polymethacrylate plastisol composition a non-yellowing additive selected from the group consisting of a) aldehydes, b) ketones, c) hexamethylenetetramine, and (d) mixtures of (a) and (b) or (a) and (c) or (b) and (c) or (a) and (b) and (c), and applying the plastisol composition containing said additive onto said primed steel or steel parts prior to applying said top coat.
Dependencies are inferred from the claim text.