Multi-layer sheet having a weatherable surface layer
View Patent ↗A multi-layer sheet and a process for producing the sheet are disclosed. The sheet can comprise a first polymer layer comprising a weatherable film of polyvinyl fluoride (PVF) or polyvinylidene fluoride (PVDF) having an adhesive coating on one side; second pigmented polymer layer extruded onto the adhesive coating of the first polymer layer; and optionally a third extruded thermoformable polymer backing layer. The process can comprise combining a pigmented polymer onto the adhesive coating surface of the weatherable film of PVF or PVDF, passing the resulting structure into a nip of two rolls under pressure and subsequently an optional third thermoformable polymer backing layer is extruded or laminated onto the pigmented polymer layer.
1. A thermoformable multi-layer sheet comprising or produced from a cast film comprising a weatherable film and a second polymer layer wherein
the weatherable film is a material selected from the group consisting of polyvinyl fluoride (PVF) and polyvinylidene fluoride (PVDF) and has an adhesive coating on one side of the cast film and the coating is an acrylic polymer comprising one or more UV absorbers, UV stabilizers, or mixtures thereof;
the second polymer layer, extruded onto the adhesive coating of the cast film and the second polymer layer, is an ionomer resin of a copolymer of ethylene and 8-25% by weight, based on the weight of the copolymer, of a C 3 -C 8 α,β ethylenically unsaturated monocarboxylic acid at least 35% of acid moieties neutralized with metal ions and said second polymer layer contains pigments, dyes, flakes, flake pigments, or any mixtures thereof; and
optionally, a third polymer layer in direct contact with the second layer and adhered to the second polymer layer, wherein the sheet has a distinctness of image of at least 60.
2. The sheet of claim 1 wherein the second polymer layer contains 0.5-10% by weight, based on the weight of the ionomer, of flake pigments.
3. The sheet of claim 1 wherein the second polymer layer consists essentially of an ionomer resin of ethylene and 12-18% by weight, based on the weight of the copolymer, of methacrylic acid or 10-15% by weight, based on the weight of the copolymer of acrylic acid, and 35-75% neutralized with metallic ion selected from the group consisting of zinc, lithium, sodium, magnesium, calcium and any mixtures thereof and having a Melt Index of 0.4 -4.0 and contains pigments, dyes, flakes and any mixtures thereof.
4. The sheet of claim 3 wherein the first polymer layer is the PVF cast film and the second polymer layer is the ionomer resin.
5. The sheet of claim 3 wherein the first polymer layer is the PDVF cast film and the second polymer layer is the ionomer resin.
6. The sheet of claim 1 wherein the second polymer layer is the ionomer of comprising ethylene and, based on the weight of the copolymer, 12-18% of methacrylic acid or 10-15% of acrylic acid and is neutralized with zinc and contains pigments, dyes, flakes, flake pigment, or any mixtures thereof.
7. The sheet of claim 1 further comprising a third polymer layer applied by extrusion or lamination to the second polymer layer.
8. The sheet of claim 7 thermoformed into an auto part, auto panel, truck part or truck panel.
9. The sheet of claim 1 further comprising a third polymer layer applied by extrusion or lamination to the second polymer layer and back cladded with a fourth polymer layer.
10. The sheet of claim 9 thermoformed into an auto part, auto panel, truck part or truck panel.
11. The sheet material of claim 1 wherein the structure of the cast film and second polymer layer is thermoformed into a structure and then back cladded by injection molding with a third polymer layer.
12. An article comprising the thermoformable sheet of claim 1 wherein the article comprises an auto part, a truck part, an auto or truck body panel, or a part or panel of a recreational vehicle and the sheet has a Class A surface.