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  Colorfast dyed poly ether imide articles including fiberUSPTO Application #: 20070224422Title: Colorfast dyed poly ether imide articles including fiber Abstract: A composition comprising a dyed polymer fiber capable of holding the color of the dye wherein the fiber comprises a polyetherimide and the dyed fiber has a colorfast score of 1/5 or higher according to ISO 105-302. (end of abstract)
Agent: Geam - 08cu - UltemIPLegal - Pittsfield, MA, US Inventors: Youssef Fakhreddine, Rudi van der Hooft USPTO Applicaton #: 20070224422 - Class: 428375 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070224422. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001]The present invention relates to colorfast dyed fibers comprising a polyetherimide polymer. The present invention is also directed to polyetherimide articles which are dyed and colorfast. BACKGROUND OF THE INVENTION [0002]Polyetherimides are a known class of polymers that have found great utility in a variety of applications because of there properties. Polyetherimides are flame resistant, have high Tg's, are ductile, generate low amounts of smoke and have good chemical resistivity. As such, PEI has found use as shaped articles, sheet materials, and coatings. Recently polyetherimide fibers have been investigated as fibers, See U.S. Pat. No. 5,670,256 to St. Clair et al. issued Sep. 23, 1997. [0003]Polyetherimides in general, including those available from General Electric (also referred as "GE") Plastics under the ULTEM tradename, have high viscosity at low shear rate that is still sufficient for fiber spinning of such amorphous material. PEI can be melt or solvent spun into fiber with denier ranging form 0.25 to 50. PEI in molded part has low ductility. Surprisingly, fibers of PEI have elongation at break as high as 80%. The flame performance when used 100% will meet most flame requirement for textile, furniture, bedding and aerospace industries. Surprisingly, high flame performance will be achieved when combined or blended with low flame performance materials and other high flame performance fibers (but non-melting) such as Aramids, Kevlar, Polybenzimidazole, polybenzoxymidazole, Polyimide, Rayon and other fibers. The blends could contain a PEI fiber from 5 to 99% range. [0004]Protective apparel and uniforms (clothing for firefighters, for example), furniture (flame resistant sofa's, for example), bedding (flame resistant mattresses), automotive and aerospace seating industries have been requiring high flame resistance performance from construction materials. In many instances flame resistant performance fibers are significantly more expensive than non-flame resistant fibers, thus impeding the use of more expensive fibers in these important applications. For example, the prices of flame resistant polymers such as PBO, PI, and PBI can range from $80-$200/lb at the time of the filing of this patent application. Expensive fibers such as PBO, PI, PBI, Aramid Flame retarded materials such as FR Rayon, FR cotton, NOMEX and KEVLAR fibers have been used. These fibers have low resistance to ultra violet light, which weakens them and consequently shortens their useful lifetime. [0005]Polyetherimide fiber is an amorphous fiber with excellent flame resistance (predicted), ability to melt and stick to other fiber (blocks emission of flame supporting volatiles) combined with high UV resistance when use alone (100%) or blended with other flammable or non-flammable fibers will result in flame resistant (woven or non-woven) fire resistant materials with long life expectancy. [0006]One significant impediment to the more widespread use of polyetherimide fibers has been their subjectively unattractive yellow color. In fact, polyetherimide has been difficult, if not impossible to dye. Dr. D. Bohringer states in his article "New Filaments and Fibers of Polyetherimide", Chemiefasern/Textilindustrie (CTI) Vol. 41/93 (March 1991) pp. T12-T16 that "due to their amorphous structure it is not possible to dye the [polyetherimide] fiber by conventional processes" (bracketed material added). In the AKZO "PEI High Performance Fiber" publication issued by the Akzo Fibres and Polymers Division of ENKA AG, polyetherimide fiber is characterized as "cannot be dyed by usual processes". [0007]There exists a important and unmet need for dyed polyetherimide fibers across numerous industries, including but not limited to furniture, aerospoace, transportation and textile. SUMMARY OF THE INVENTION [0008]A composition, a dyed polymer fiber capable of holding the color of the dye wherein the fiber comprises a polyetherimide and the dyed fiber has a colorfast score of 1/5 or higher according to ISO 105-302. BRIEF DESCRIPTION OF THE FIGURES [0009]FIG. 1 is a schematic of a method of producing the dyed PEI fiber according to the present invention. Heated Polymer is fed into a metering pump (1) and then through a filter (20) to remove unwanted debris and prevent clogging of the spinneret (3). After being filtered (2) the heated polymer is passed through a spinneret (3) to produce one or more strands of PEI fiber (4) which are air quenched (5) and processed through a convergence guide (6). A finish, if desired, can be applied via a finish applicator (7). The PEI fibers are then drawn (8), placed on a bobbin (9) and exposed to a dye. DETAILED DESCRIPTION OF THE INVENTION [0010]The term "ISO 105-302" refers to: the International Organization for Standardization standards set forth in the Fourth Edition (1994-09-15) which is herein incorporated by reference in its entirety, as though set forth in full. [0011]According to the present invention the term "Denier" refers to a unit of fineness of silk and some artificial fibers such as nylon equal to one gram per 9,000 meters of yarn. [0012]The term "dyeing" denotes imparting a substantially permanent color (as defined by the ISO 105-B02 colorfastness standard of at least 1) to organic fibrous or filamentous material or other porous material by the use of substances, or preparations possessing tincorial properties and which are not dependent for their ability to become fixed to the base solely upon the presence of an adhesive of bindive vehicle or ingredient, as distinguished from the application of an insoluble pigment suspended in a bindive vehicle, e.g., paint or any colored coating composition where the coloring agent does not actually color the base. [0013]Dyability" refers to one or more constellation of related properties of a fiber's, in this case a polymer fibers, ability to be dyed including the rate at which the polymer can be dyed, the amount of dye that can be applied to the polymer (ie dye exhaustion), and the fastness of the dyes on the dyed polymers. [0014]Dye Additive" or "dye assistant" is defined to be any material added to a dye to help in dyeing and is not basically a part of the dye itself. [0015]Mordants" are substances of organic or inorganic origin which combine with the coloring matter and are used to fix the same in the production of the color. For the purpose of the present invention, materials as oils and sulfonated oils, soaps, fats and higher acids, are not generally considered as mordants, but as coming within the scope of "assistants" in dyeing. [0016]For purposes of the present invention the term "polyetherimide" refers to a polymer containing monomer units which comprise both a ether and an imide group. [0017]An ether group is well known in the art and consists of an oxygen atom single bonded to two different carbon atoms. An imide group is a nitrogen containing acid having two double bonds. [0018]Chromophore means the chemical group that gives color to a molecule. [0019]The term substrate is used here to refer to the base material being dyed. Continue reading... Full patent description for Colorfast dyed poly ether imide articles including fiber Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Colorfast dyed poly ether imide articles including fiber patent application. Patent Applications in related categories: 20080241534 - Fluorine-containing resin for electric wire jacket and electric wire jacket produced from same - The present invention provides a fluorine-containing resin being excellent in mold-processability and providing an electric wire jacket having excellent flame retardance, low smoke releasing property, flexibility and mechanical properties. 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