Plastic surfaces having improved surface characteristics
View Patent ↗The disclosure provides a melt processible theromoplastic composition, comprising a major proportion of a base polymer comprising a first melt processible thermoplastic polymer having a first Fedor's solubility parameter and a first viscosity; and a combination of a carrier polymer and a surface modifying additive, the carrier polymer comprising a second melt processible thermoplastic polymer which has a second Fedor's solubility parameter that is at least about 2.5 (J/cm 3 ) 1/2 lower than the first Fedor's solubility parameter, and a second viscosity, the carrier polymer being adhered to the surface modifying additive, and wherein the first viscosity is at least about 10 times the second viscosity.
1. A melt processible thermoplastic composition, comprising:
a major proportion of a base polymer comprising a first meltprocessible thermoplastic polymer having a first Fedor's solubility parameter and a first viscosity; and
a combination of a carrier polymer and a surface modifying additive, the carrier polymer comprising a second melt processible thermoplastic polymer which has a second solubility parameter that is at least 2.5 (J/cm 3 ) 1/2 lower than the first solubility parameter, and a second viscosity, the carrier polymer being adhered to the surface modifying additive, and
wherein the first viscosity is at least 25 times the second viscosity, as measured by a Cone and Plate viscometer at 190° C., at 6.283 rad s′ 1 and at 500 s; and
wherein the base polymer is polyvinyl chloride.
2. The composition of claim 1 wherein the base polymer is present in the amount of 80 to 99.95% by weight, based on the entire weight of the melt processible thermoplastic composition.
3. The composition of claim 1 wherein the carrier polymer is selected from the group consisting of ethylene vinyl acetate copolymers; acrylate copolymers; polyethylene; polypropylene and their copolymers; and homo and co-polymers of tetrafluoroethylene.
4. The composition of claim 1 wherein the carrier polymer is present in the amount of 0.05 to 20% by weight, based on the entire weight of the combination.
5. The composition of claim 1 wherein the surface modifying additive is a solid selected from the group consisting of silicates; metal oxides; calcium carbonate; barium sulfate; elemental metal powders; silicas and mixtures thereof.
6. The composition of claim 5 wherein the metal oxides are selected from the group consisting of oxides of titanium, magnesium, calcium, barium, strontium, zinc, tin, nickel, silicon, and iron, selenium, tungsten, ruthenium, tantalum, silver, iridium, molybdenum, niobium, indium, cadmium, hafnium, zirconium, manganese, copper (I), vanadium, chromium (VI), yttrium, and germanium, fumed silica and mixed oxides aluminosilicate and Ti x Zri. x 02 wherein x is between 0 and 1.
7. The composition of claim 1 wherein the surface modifying additive has a particle size diameter of 0.02 u.m to 50 um.
8. The composition of claim 1 wherein the surface modifying additive is selected from carbonates, sulfates, titanates, arsenides, sulfides, selenides, phosphides and combinations of two or more thereof; is selected from an inorganic pigment, an organic colored pigment, and mixtures thereof; is a biocide; is selected from fluorochemicais, lecithin and mixtures thereof; or is carbon black, or a potassium ionomer.
9. The composition of claim 1 wherein the surface modifying additive may be present in the amount of 0.05 to 20% by weight, based on the entire weight of the composition.