Particle filled flexible coating composition of aromatic polyester and vinylidene chloride copolymer
AssigneeErcon, Inc.
InventorJohn E. Ehrreich
Life of this patent
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Abstract
A coating composition having surprisingly superior physical properties, particularly when highly-filled with small particles and bonded to a flexible film of a polymeric substrate. The composition consists essentially of (1) a homogeneous binder formed of relatively hard, high-tensile, aromatic polyester compounded with a vinylidene chloride copolymer such that the copolymer serves as means to increase the elongation, toughness and heat resistance of the binder and (2) the filler. The process of forming such a binder comprises formation of a homogeneous polymeric solution wherein each of the polymers is intimately distributed within the same solvent phase.
Claims23
A solid composition comprising a substantial volume of particles held in particle-to-particle contact within an organic binder wherein said binder consists of at least 80% of a blend of (a) thermoplastic aromatic polyester resin and (b) a vinylidene chloride copolymer.
A liquid coating formulation comprising a homogeneous solution of solvent and
- (1) an aromatic polyester resin and a vinylidene chloride copolymer;
- and
- (2) a quantity of particles having an average maximum particle diameter of less than about 15 microns said quantity being effective to form particle-to-particle contact on evaporation of said solvent;
- and characterized by said solution remaining substantially homogeneous as said solvent is evaporated.
A process for making coated products comprising an organic substrate and a coating formed of a filler-loaded organic resin binder, said process comprising the steps of
- (a) forming a homogeneous solution comprising an aromatic polyester resin and a vinylidene chloride copolymer,
- (b) loading filler into said solution,
- (c) coating said filler-loaded solution onto said substrate and
- (d) evaporating said solution to substantial dryness while maintaining the homogeneity of said solution.
A two-component polymer system for making coatings composition an effective amount of conductive metal flake or carbon black in a quantity effective to render said coatings electroconductive, solid compositions formed of said two-component polymer system comprising essentially of
- (a) a first liquid composition comprising said metal flake or black dispersed and suspended in a thermoplastic aromatic polyester resin polymer solution which is relatively non-reactive with said flake as determined by its contributing no substantial viscosity rise when said first composition is aged for 15 hours at 80.degree. C.,
- (b) a second liquid composition formed of an ethylenic polymer of vinylidene chloride or copolymers comprising vinylidene chloride and a solvent therefor, said second liquid composition showing no substantial rise in viscosity of said second liquid composition when it is heated at 15 hours at 80.degree. C. along.
Dependencies are inferred from the claim text.