Coating for printable plastic films
AssigneeMobil Oil Corporation
InventorsPang-Chia Lu, Gordon Musclow, Robert Michael Sheppard
Life of this patent
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Abstract
The invention provides a lithographic printable plastic film. A plastic film is coated with a coating formulation which allows lithographic printing on plastic films. The coating composition comprises an acrylic binder, specifically a blend of acrylic polymer and ethylene-acrylic acid copolymer, at least one particulate filler, specifically silica, calcium carbonate, clay, talc, titanium dioxide and mixtures thereof, a surfactant and, optionally, an ultraviolet stabilizer. The coating composition is applied to a plastic film for lithographic printing.
Claims21
A coating composition for lithographic printing of a thermoplastic substrate comprising:
- (a) about 20 to about 80 weight percent based on the entire weight of the coating of a binder composition consisting of about 5 to about 50 weight percent of a homopolymer of acrylic acid and about 95 to about 50 weight percent of an ethylene acrylic acid copolymer;
- (b) about 20 to about 80 weight percent, based on the entire weight of the coating, of at least one finely divided particulate filler selected from the group consisting of silica, talc, diatomaceous earth, calcium silicate, bentonite and clay;
- (c) about 1 to about 15 weight percent, based on the entire weight of the coating, of at least one ultraviolet stabilizer additive;
- and
- (d) about 0.5 to about 10 weight percent, based on the entire weight of the coating, of a surface active agent.
A lithographic printable thermoplastic substrate comprising:
- a polyolefin substrate treated on at least one surface with a coating composition comprising:
- (a) about 20 to about 80 weight percent based on the entire weight of the coating of a binder composition consisting of about 5 to about 50 weight percent of a homopolymer of acrylic acid and about 95 to about 50 weight percent of an ethylene acrylic acid copolymer;
- (b) about 20 to about 80 weight percent, based on the entire weight of the coating, of at least one finely divided particulate filler selected from the group consisting of silica, talc, diatomaceous earth, calcium silicate, bentonite and clay;
- (c) about 0. 5 to about 10 weight percent, based on the entire weight of the coating, of a surface active agent.
A method of coating a thermoplastic substrate comprising the step of applying to a thermoplastic substrate comprising a biaxially oriented polypropylene film a coating composition comprising:
- (a) about 20 to about 80 weight percent based on the entire weight of the coating of a binder composition consisting of about 5 to about 50 weight percent of a homopolymer of acrylic acid and about 95 to about 50 weight percent of an ethylene acrylic acid copolymer;
- (b) about 20 to about 80 weight percent, based on the entire weight of the coating, of at least one finely divided particulate filler selected from the group consisting of silica, talc, diatomaceous earth, calcium silicate, bentonite and clay;
- (c) about 1 to about 15 weight percent, based on the entire weight of the coating, of at least one ultraviolet stabilizer additive selected from the group consisting of benzotriazoles, hindered amine free-radical scavengers and mixtures thereof, and
- (d) about 0.5 to about 10 weight percent, based on the entire weight of the coating, of a surface active agent.
Dependencies are inferred from the claim text.