# US 5,700,555 A · Sandable and stainable plastic/wood composite > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,555 A - Document ID: US5700555A - Status: Granted - Kind: A - Application number: 08/113,989 - Filed: 1993-08-30 - Granted: 1997-12-23 - Earliest claimed: 1993-08-30 - Assignees: Formtech Enterprises, Inc. - Inventors: Otto Grill - Web page: https://patentgrep.com/patent/US5700555A ## CPC - B29C 48/07: Flat, e.g. panels - B27N 3/28: characterised by using extrusion presses - B29C 48/022: {characterised by the choice of material} - B29C 48/09: Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels - B29C 48/12: Articles with an irregular circumference when viewed in cross-section, e.g. window profiles - B29C 48/175: {comprising a multi-coloured single component, e.g. striated, marbled or wood-like patterned} - B29C 48/19: the layers being joined at their edges - B29C 48/21: the layers being joined at their surfaces - B29C 48/307: {specially adapted for bringing together components, e.g. melts within the die} - B29C 70/086: {and with one or more layers of pure plastics material, e.g. foam layers (applying a non-preformed coating, e.g. a gel-coat, B29C37/0025; with foam blocks B29C70/86)} - B32B 23/02: in the form of fibres or filaments {(not used)} - B32B 27/04: as impregnant, bonding, or embedding substance {(not used)} - B32B 27/08: of synthetic resin - B32B 27/18: characterised by the use of special additives - B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF} - B44F 9/02: wood grain effects - E06B 1/26: Frames of plastics - E06B 3/20: of plastics - B29C 59/02: by mechanical means, e.g. pressing {(B29C59/007 takes precedence; embossing expanded porous articles B29C44/5627)} - B29K 2105/06: containing reinforcements, fillers or inserts - B29K 2995/002: Coloured - B29L 2031/724: {Doors} - B32B 2262/062: Cellulose fibres, e.g. cotton - B32B 2264/102: Oxide or hydroxide - B32B 2305/026: Porous - E04F 2011/1897: {mainly of organic plastics with or without reinforcements or filling materials} - E06B 3/22: Hollow frames {(E06B3/205 takes precedence)} - Y10T 428/2913: Rod, strand, filament or fiber - Y10T 428/2915: including textile, cloth or fabric - Y10T 428/2933: Coated or with bond, impregnation or core - Y10T 428/2938: Coating on discrete and individual rods, strands or filaments - Y10T 428/2964: Artificial fiber or filament - Y10T 428/2965: Cellulosic - Y10T 428/2967: Synthetic resin or polymer - Y10T 442/387: Vinyl polymer or copolymer sheet or film [e.g., polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, etc.] - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B27N: MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL (containing cementitious material B28B; shaping of substances in a plastic state B29C; fibreboards made from fibrous suspensions D21J; drying F26B17/00) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B44F: SPECIAL DESIGNS OR PICTURES - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES - E04F: FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS (windows, doors E06B) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A composite article includes a first zone made entirely of plastic and a second zone made of plastic and natural fiber. The first and second zones are integral and are continuously coextruded. The ratio of natural fiber in the second zone is between 10% and 55%. The outer surface of the second zone includes embossing to resemble wood grain. The outer surface has sufficient porosity so as to hold and retain wood stain and paint so that the composite article is stainable to resemble genuine wood. The composition of the second zone includes between 45% and 90% polyvinylchloride, between 10% and 55% natural fiber, and external lubricate and a fusion enhancer. A color adjusting agent such as titanium dioxide, and coloring agents may also be added. ## Claims ### Claim 1 A composite article of manufacture comprising: a first zone, said first zone being comprised of a first plastic; and a second zone, said second zone being comprised of a second plastic, and a natural cellulose-containing fiber, a paraffin or hydrocarbon wax blend metal release agent to control the porosity of said second zone having an outer surface, said outer surface being porous to hold and retain wood stain or paint; and an oxidized polyethylene fusion enhancer to form a homogeneous melt of the natural cellulose-containing fiber and the second plastic and modifies the effect of the porosity aid which deters fusion, yet retains the porosity of the second zone; and said first and second zones being integral and being coextruded together. ### Claim 2 (depends on 1) The article of claim 1 wherein a ratio of natural fiber to plastic in said second zone is between 10% and 55%. ### Claim 3 (depends on 1) The article of claim 1 wherein said natural fiber is woodflour having a particle size between 850 microns and 106 microns. ### Claim 4 (depends on 1) The article of claim 1 wherein said second zone further comprises: an outer surface, said outer surface having porosity so as to be sandable. ### Claim 5 (depends on 1) The article of claim 1 wherein said article further comprises: a weather stripping member, said weather stripping member being affixed to said second zone. ### Claim 6 (depends on 1) The article of claim 1 wherein said article is a column with a generally square cross-section, said article having a center plane, said center plane dividing said first zone from said second zone, said second zone to be mounted on an interior side of an associated window. ### Claim 7 (depends on 1) The article of claim 1, said article further comprising a coloring means for coloring said article. ### Claim 8 (depends on 7) The article of claim 7 wherein said article further comprises a color adjusting means for adjusting the color of said article. ### Claim 9 (depends on 8) The article of claim 8 wherein said color adjusting means comprises titanium dioxide. ### Claim 10 (depends on 1) The article of claim 1 wherein second zone further comprises: an said outer surface has embossing thereon. ### Claim 11 (depends on 1) The article of claim 1 wherein said second zone comprises: polyvinylchloride in a ratio of between 45% and 90% ; and natural fiber in a ratio of between 10% and 55% . ### Claim 12 (depends on 11) The article of claim 11 wherein said natural fiber has a particle size between 850 microns and 106 microns. ### Claim 13 (depends on 11) The article of claim 11 wherein said natural fiber is hardwood woodflour. ### Claim 14 A composite article formed by a coextrusion process, said composite article characterized by: a first zone, said first zone being formed from a first extrudate, said first extrudate comprising polyvinylchloride; a second zone, said second zone being formed from a second extrudate, said second extrudate comprising polyvinylchloride, a natural cellulose-containing fiber, a paraffin or hydrocarbon wax blend metal release agent to control the porosity of said second zone, a surface of the second extrudate having a porosity sufficient to hold and retain wood stain or paint, and an oxidized polyethylene fusion enhancer to form a homogeneous melt of the natural cellulose-containing fiber and the polyvinylchloride and modifies the effect of the metal release agent which deters fusion, yet retains the porosity of said second zone; and said first and second zones being integrally connected. ### Claim 15 (depends on 14) The article of claim 14 wherein said second extrudate further comprises: a coloring agent; and a color adjusting agent. ### Claim 16 (depends on 14) The article of claim 14 wherein said second extrudate comprises said polyvinylchloride in a ratio of between 50% and 95%, and said natural fiber in a ratio of between 10% and 50%.