Patent EP0208873A2 successfully refreshed from Google Patents.
EP0208873A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Elongated molding granules and injection-molding process employing them
Assignee: Wyeth Holdings LLC
•
Filing: 1986-05-17
•
Granted: —
•
Expires: 2006-05-17
Abstract
Abstract Elongated granules of reinforcing fibers extending generally parallel to each other longitudinally of the granule substantially uniformly dispersed throughout a thermally stable, film forming thermoplastic adhesive, providing complete dispersion of the fibers during an injection molding cycle, conserving physical properties and providing significantly better EMI shielding than prior art extruder compounded resin/ fiber blends.
Inventors
- 👤 Bruce Arthur Luxon
- 👤 Malalur Venkat Murthy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:50
CPC Classifications
C; C08; C08K; C08K7/00; B; B29; B29C; B29C45/00; B29C45/0005; B29B; B29B9/00; B29B9/12; B29B9/14; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08K9/00; C08K9/08; B29C2045/0091
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
59 words
An injection molding compound comprising elongated granules, each of said granules containing a bundle of elongated reinforcing filaments extending generally parallel to each other longitudinally of the granule and substantially uniformly dispersed throughout said granule in a thermally stable, film forming thermoplastic adhesive which substantially surrounds each said filament, each said filament optionally being treated with a coupling agent.
Claim 2
Dependent Claim
59 words
An injection molding compound comprising elongated granules, each of said granules containing a bundle of elongated reinforcing filaments extending generally parallel to each other longitudinally of the granule and substantially uniformly dispersed throughout said granule in a thermally stable, film forming thermoplastic adhesive which substantially surrounds each said filament, each said filament optionally being treated with a coupling agent.
Claim 3
Dependent Claim
23 words
An injection molding compound as defined in Claim 1 wherein said granules are from about one-forty eighth to about three-sixteenths inches in diameter.
Claim 4
Dependent Claim
29 words
An injection molding compound as defined in Claim 1 wherein the amount of thermoplastic adhesive is not substantially in excess of that which maintains fiber bundle integrity during handling.
Claim 5
Dependent Claim
33 words
An injection molding compound as defined in Claim 1 wherein the reinforcing filaments comprise from about 67.5-97% by volume and the thermally stable, film forming adhesive comprises correspondingly from about 2.5-32.5% by volume.
Claim 6
Dependent Claim
40 words
An injection molding compound as defined in Claim 1 wherein the thermoplastic adhesive also includes a compatible polymeric plasticizer in an amount sufficient to lower the melting temperature of said adhesive to provide improved dispersion in lower melt temperature resins.
Claim 7
Dependent Claim
50 words
An injection molding compound as defined in Claim 1 wherein the thermoplastic adhesive comprises a poly (C₂-C₆ alkyl oxazoline), alone, or in further combination with a polymeric plasticizer comprising a poly (C₂-C₆ alkylene glycol), which substantially surrounds each said filament, said filaments being untreated or treated with a coupling agent.
Claim 8
Dependent Claim
35 words
An injection molding compound as defined in Claim 1 wherein said reinforcing filaments comprise graphite fibers, glass fibers, aramid fibers, stainless steel fibers, metal coated graphite fibers or a mixture of any of the foregoing.
Claim 9
Dependent Claim
59 words
An injection molding compound as defined in Claim 6 wherein the thermoplastic adhesive comprises poly(ethyl oxazoline) which has a molecular weight in the range of from about 25,000 to about 1,000,000, the polymer plasticizer comprises a poly(ethylene glycol) which has a molecular weight in the range of about 200 to about 600 and the coupling agent comprises N-(2-aminoethyl)-3-aminopropyltrimethoxy silane.
Claim 10
Dependent Claim
50 words
An elongated injection molding granule comprising about 67.5-97.5% by volume of reinforcing filaments extending generally parallel to each other longitudinally of the granule and substantially uniformly dispersed throughout said granule in from about 2.5-32.5% by volume of a thermally stable, film forming thermoplastic adhesive which substantially surrounds each said filament.
Claim 11
Dependent Claim
50 words
An elongated injection molding granule comprising about 67.5-97.5% by volume of reinforcing filaments extending generally parallel to each other longitudinally of the granule and substantially uniformly dispersed throughout said granule in from about 2.5-32.5% by volume of a thermally stable, film forming thermoplastic adhesive which substantially surrounds each said filament.
Claim 12
Independent Claim
136 words
A method of manufacturing an injection molding granule comprising the steps of continuously passing reinforcing filaments through at least one bath of a thermally stable, film forming thermoplastic adhesive in a liquid medium to impregnate the filaments, passing the impregnated filaments through a sized opening to remove any excess adhesive, passing the treated filaments into a heating zone first to evaporate the liquid medium and then to flux the thermoplastic adhesive, and withdrawing the treated filaments from said zone and thereafter chopping them into elongated granules whereby there are produced granules comprising about 67.5-97.5% by volume of reinforcing filaments extending generally parallel to each other longitudinally of the granule and substantially uniformly dispersed throughout said granule in from about 2.5-32.5% by volume of a thermally stable, film forming thermoplastic adhesive which substantially surrounds each said filament.
Claim 13
Independent Claim
136 words
A method of manufacturing an injection molding granule comprising the steps of continuously passing reinforcing filaments through at least one bath of a thermally stable, film forming thermoplastic adhesive in a liquid medium to impregnate the filaments, passing the impregnated filaments through a sized opening to remove any excess adhesive, passing the treated filaments into a heating zone first to evaporate the liquid medium and then to flux the thermoplastic adhesive, and withdrawing the treated filaments from said zone and thereafter chopping them into elongated granules whereby there are produced granules comprising about 67.5-97.5% by volume of reinforcing filaments extending generally parallel to each other longitudinally of the granule and substantially uniformly dispersed throughout said granule in from about 2.5-32.5% by volume of a thermally stable, film forming thermoplastic adhesive which substantially surrounds each said filament.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.