Polyurethane pultrusion formulations for the production of articles with improved coating adhesion and articles produced therefrom
AssigneeCovestro LLC
InventorsStephen J. Harasin, John E. Hayes, David Sounik
Life of this patent
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Abstract
Polyurethane composites to which paint will adhere without the need for an aggressive pretreatment are produced by a pultrusion process using a polyurethane-forming system that includes a polyisocyanate component containing at least one polyisocyanate and an isocyanate-reactive component containing at least one cashew oil-based polyether polyol.
Claims19
A polyurethane-forming system for the production of a fiber reinforced composite to which a coating may be applied with minimal pretreatment comprising:
- a) a polyisocyanate component containing at least one polyisocyanate, and
- b) an isocyanate-reactive component containing at least one cashew oil-based polyether polyol wherein the cashew oil-based polyol is present in an amount of at least 20% by weight, based on total weight of the isocyanate-reactive component
- wherein a coated the fiber reinforced composite produced from this polyurethane-forming system is characterized by excellent adhesion.
A pultrusion process for preparing a fiber reinforced polyurethane composite with improved paint adhesion, the process comprising:
- a) continuously pulling a roving or tow of continuous fiber reinforcing material successively through an impregnation chamber and a die;
- b) continuously feeding a polyurethane-forming system comprising a polyisocyanate component containing at least one polyisocyanate, and an isocyanate-reactive component containing at least one cashew oil-based polyether polyol to the impregnation chamber;
- c) contacting the fiber reinforcing material with the polyurethane-forming system in the impregnation chamber in a manner such that substantially complete wetting of the fiber reinforcing material by the polyurethane-forming system occurs;
- d) directing the fiber reinforcing material from c) through a die heated to reaction temperature to form a solid composite;
- and
- e) drawing the composite from the die.
Dependencies are inferred from the claim text.