Dye-containing porous plastic element and method of making it
Patent 4870116 Issued on September 26, 1989. Estimated Expiration Date: 
December 19, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 19, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3019201 3669922 3927156 Method of making a direct inking platen Process for producing a porous matrix Sinterable, finely particular molding composition based on vinyl chloride polymers Air freshener unit Patent #: 4735626 InventorApplicationNo. 07/225868 filed on 12/19/1988US Classes:521/143, From acyclic mono-unsaturated hydrocarbon as only reactant521/182, Cellular product derived from a -C-C(=X)-X containing reactant wherein X is a chalcogen atom, e.g., phthalic acid, etc.521/184, Nitrogen reactant contains at least two amino nitrogen atoms521/185, Carbocyclic reactant containing -C-C(=X)-X, e.g., containing carboxyl, etc.521/919SINTERED PRODUCTExaminersPrimary: Foelak, MortonAttorney, Agent or FirmInternational ClassesB43K 8/00 (20060101)B43K 8/02 (20060101) B41K 1/00 (20060101) B41K 1/50 (20060101) C08J 3/20 (20060101) AbstractA dye-containing porous plastic element, comprising a plastic body having interconnected capillary passageways, and a dry, water-soluble dye located within the passageways. The passageways extend to at least one surface of the body, and the size of the passageways are such that the body, when contacted with water, can absorb the water to wet the dye and make it soluble. The plastic body comprises fused granules of plastic interspersed with dry granules of dye. The plastic granules may have a diameter, prior to fusion, of between about 50 and 800 microns, preferably between about 100 and 300 microns. The dry dye comprises between about 5 percent and 35 percent of the element, by weight, and preferably between about 10 percent and 20 percent. A method of making the dye-containing porous plastic element involves mixing together plastic granules and dry dye granules, and subjecting the mixture to heat and pressure so as to fuse the granules together into a porous body having interconnected capillary passageways and the dye granules within the passageways. A surfactant may be mixed together with the plastic and dye granules prior to subjecting the mixture to heat and pressures.Field of SearchFrom acyclic mono-unsaturated hydrocarbon as only reactantCellular product derived from a -C-C(=X)-X containing reactant wherein X is a chalcogen atom, e.g., phthalic acid, etc. Nitrogen reactant contains at least two amino nitrogen atoms Carbocyclic reactant containing -C-C(=X)-X, e.g., containing carboxyl, etc. | |
