Paint coated sheet material with adhesion promoting composition
AssigneeEastman Kodak Company
InventorsMary A. Krenceski, John M. Pochan
Life of this patent
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Abstract
A protective and decorative, stretchable, thermoplastic sheet material for bonding by thermoforming to automobile body panels and other articles which comprises a polyester carrier film coated with an aqueous polyurethane paint composition. To aid in the adhesion of the paint, the carrier film is coated with a tie coat composition comprising a self-crosslinking, aqueous polyurethane dispersion.
Claims11
A stretchable, thermoformable protective and decorative sheet material for use in a thermoforming process in which it is stretched and bonded to a three dimensional substrate which comprises
- a flexible and stretchable, thermoformable polyester carrier film
- a polyurethane paint layer formed from a water-based polyurethane paint composition,
- a crosslinked polyurethane transparent topcoat, and
- disposed between the carrier film and the paint layer, a thin tie layer formed by coating on the carrier film a self-crosslinking aqueous polyurethane anionic colloidal dispersion, the polyurethane being derived from a polyurethane prepolymer of which the chain is extended with an aliphatic polyamine chain extender and is end capped with N-methylol hydrazide groups, the prepolymer being derived from (a) an aliphatic diisocyanate and (b) an aliphatic polyester polyol and having pendant water-dispersing carboxylic salt groups in the polymer chain;
- said sheet material having a peel strength greater than 3000 g/in after conditioning at 38.degree. C. and 100 percent RH.
An article comprising a three dimensional substrate having bonded thereto a stretchable, thermoformable protective and decorative sheet material comprising a stretchable thermoformable polyester carrier film, a polyurethane paint layer formed from a water-based polyurethane paint composition, a crosslinked polyurethane paint composition, a crosslinked polyurethane transparent topcoat, and a thin tie layer formed by coating on the carrier film a self-crosslinking aqueous polyurethane anionic colloidal dispersion, the polyurethane being derived from a polyurethane prepolymer of which the chain is extended with an aliphatic polyamine chain extender and is end capped with N-methylol hydrazide groups, the prepolymer being derived from (a) an aliphatic diisocyanate and (b) an aliphatic polyester polyol and having pendant water-dispersing carboxylic salt groups in the polymer chain;
- said sheet material having a peel strength greater than 3000 g/in after conditioning at 38.degree. C. and 100 percent RH.
Dependencies are inferred from the claim text.