Method of making crosslinked acrylic sheet with enhanced vacuum molding attributes
AssigneeAristech Chemical Corporation
InventorsRichard A. Daff, James D. Leaseburge
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Abstract
A protective film is placed on acrylic sheet. The film has a polyethylene side and an adherent EVA side; it will survive stressful lamination procedures as well as thermoforming, and can be easily removed from a finished article after thermoforming.
Claims13
Method of continuously making an acrylic sheet having improved properties for thermoforming comprising continuously casting said sheet on a casting belt from a casting syrup comprising methyl methacrylate and about 5% to about 40% polymethylmethacrylate dissolved therein and containing about 0.1% to about 0.3% crosslinking agent based on the weight of the syrup, continuously curing said sheet while on said belt, and applying continuously to said sheet a film comprising a layer of polyethylene and a layer of a blend of polyethylene and a copolymer of ethylene and vinyl acetate, said film being applied to said acrylic sheet by the layer thereof which is made of said lend of polyethylene and a copolymer of ethylene and vinyl acetate.
Method of making a laminate of acrylic and a different thermoplastic material, said laminate having improved thermoforming properties comprising continuously casting an acrylic sheet, continuously adhering thereto a film comprising a layer of polyethylene and a layer of copolymer of ethylene and vinyl acetate, by said layer of copolymer, and laminating to the side of said acrylic sheet without said film an extruded layer of a thermoplastic material different from acrylic.
Dependencies are inferred from the claim text.