US Patent No: 6,494,390
Number of patents in Portfolio can not be more than 2000
Solid state shear pulverization of multicomponent polymeric waste
Stats
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Dec 17, 2002
Issued date -
Aug 10, 2000
filing date -
09/635,673
serial no -
In Force
status
Importance
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Abstract
A method of making polymeric particulates wherein polymeric scrap material such as in the form of film waste is supplied to intermeshing pulverizer screws which are rotated to transport the polymeric material along their length and subject the polymeric material to solid state shear pulverization and in-situ polymer compatibilization. Uniform pulverized particulates are produced without addition of a pre-synthesized compatibilizing agent. The pulverized particulates are directly melt processable (as powder feedstock) and surprisingly yield a substantially homogeneous light color product. The polymeric film waste containing high proportions of LDPE yield molded articles of superior notched izod impact strength and elongation. Compatibilized polymeric particles can be formed even if the polymeric scrap material includes cellulose materials such as paper, cardboard and wood.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,415,354 Solid state shear extrusion pulverization | 14 | 1993 | |
| 5,397,065 Solid state shear extrusion pulverization | 20 | 1993 | |
| 5,743,471 Solid state shear extrusion pulverization | 20 | 1995 | |
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| 5,814,673 Reconstituted polymeric materials derived from post-consumer waste, industrial scrap and virgin resins made by solid state pulverization | 19 | 1996 | |
| 6,180,685 Reconstituted polymeric materials derived from post-consumer waste, industrial scrap and virgin resins made by solid state shear pulverization | 14 | 1998 | |
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| 4,181,647 Process for extrusion coating of a wire with a cellular thermoplastic resin material | 51 | 1976 | |
| 4,367,190 Screw extruder | 21 | 1981 | |
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| 5,268,074 Method for recycling polymeric film | 35 | 1991 | |
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| 5,073,320 Preparation of thermoplastics containing ceramic powders as fillers | 18 | 1990 | |
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| 5,395,065 Fishline length measuring device for fishing reel | 16 | 1992 | |
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| 4,650,126 Process for ambient temperature grinding of soft polymers | 25 | 1985 | |
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| 4,184,772 Mixing apparatus | 34 | 1977 | |
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| 4,917,834 Method for forming homogeneous blends of particulate materials | 11 | 1988 | |
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| 4,250,222 Process for manufacturing finished and semi-finished products from mixtures of various synthetic resin scrap materials | 84 | 1975 | |
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| 4,890,996 Continuous granulating machine | 42 | 1982 | |
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| 4,997,131 Ball valve pistol nozzle | 27 | 1989 | |
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| 4,708,617 Screw extruder with a rotatable barrel section | 15 | 1986 | |
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| 4,607,796 Method of making powder from rubber and vulcanization products | 24 | 1984 | |
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| 4,607,797 Method and apparatus for pulverizing polymers | 41 | 1984 | |
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| 4,968,463 Process for making molded or extruded objects from waste containing plastic materials | 127 | 1989 | |
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| 4,772,430 Process for compacting and solidifying solid waste materials, apparatus for carrying out the process and overall system for disposal of such waste materials | 31 | 1985 | |
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| 4,716,000 Process and apparatus for the production of a cross-linked, extruded or sprayed product | 15 | 1985 | |
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| 4,875,847 Twin-screw extruder having respective conical nose screw sections | 60 | 1989 | |
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| 4,511,091 Method and apparatus for recycling thermoplastic scrap | 16 | 1983 | |
| 5,026,512 Method for manufacturing molded products of thermoplastic and inorganic materials | 28 | 1989 | |
| 5,088,914 Double flighted extrusion screw | 25 | 1990 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jun 17, 2014 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |