Abstract: A cross-linked acrylic polymer that is highly biocompatible is prepared from a water-soluble acrylic monomer by preparing an aqueous polymerization solution containing an acrylamide monomer and a catalyzing agent; polymerizing the monomer present in the polymerization solution by agitating and heating the polymerization solution. The polymerization is conducted in the presence of gaseous oxygen.
Abstract: Polymers containing a plurality of free hydroxy groups, such as cellulose, agarose or polyvinyl alcohol, are contacted in absence of reactants for hydroxy groups, with at least one N-heterocyclic compound, e.g. pyridine, pyrrole, pyridazine, their partially or fully hydrogenated analogs and any of these which may be substituted, in a pre-activation step prior to reaction with reactant for free hydroxy groups in the polymer, the polymer-bound residue of which reactant may be thereafter reacted in turn with amino compounds containing at least one unsubstituted N-attached hydrogen atom, e.g. proteins, thereby to form amine-polymer conjugates. The invention further relates to a powder, bandage, patch or like cover for application to wounds which has been manufactured from polymer containing a plurality of hydroxy groups by a process which includes the step of providing an amine conjugated to the polymer; the amine may be, e.g., trypsin, chymotrypsin, lysozyme, collagenase, albumin and hyaluronidase.
Abstract: The invention relates to a hydrophilic cotton lap constituted 100% of cotton fibers. In the invention, the lap is a composite and comprises three cotton layers evincing inter-cohesiveness arising from a continuous lap manufacturing procedure. The external layers and enclosing the central layer are webs. The lap of the invention is used in the form of packaged or formatted units of hydrophilic cotton.
Abstract: The invention relates to a minute structure for showing an interference color having a certain wavelength within a visible light region, by reflection and interference of a natural light incident on the minute structure. The minute structure has: a laminated portion including a plurality of first layers having a first refractive index and a plurality of second layers having a second refractive index different from the first refractive index; and a stray-light absorbing member. The first and second layers are alternately placed on top of each other. The stray light has wavelengths other than the certain wavelength and is formed by transmittance of the natural light through the laminated portion, reflectance of the natural light by the laminated portion and/or scattering of the natural light by the laminated portion. The invention further relates to a fabric for showing the interference color.
Abstract: A liquid-absorbent sheet containing a liquid-absorbing material capable of absorbing drips of food, wherein a part of the outer surface of the liquid-absorbent sheet is composed of a liquid-permeable film, a part of other outer surface thereof is composed of a liquid-semipermeable film, the liquid-semipermeable film is a liquid-impermeable film having formed therein pores, the diameter of the pore is in the range of from 0.05 mm to 0.5 mm, and the porosity of the pores is in the range of from 0.01% to 0.4%. The liquid-absorbent sheet effectively absorbs drips oozing from a drippy food to prevent deterioration in qualities of the food for a prolonged period of time.
Abstract: A polyvinyl alcohol-based hollow fiber membrane having a ratio between the size of particles of 90% rejection and that of particles of 10% rejection of not more than 5, thus proving to have a sharp fractionating property, is produced by a process which comprises, on producing a polyvinyl alcohol-based hollow fiber membrane by dry-jet wet spinning or wet spinning, using a spinneret having heat insulating structure.
Abstract: A gas permeable (GP) ocular lens composition and method of formation are disclosed wherein 98-70% by wgt. of a first polymer component, selected for desired characteristics including gas permeability, and 2-30% by wgt. of a second polymer component, selected for basic GP lens characteristics such as rigidity, structural stability and desired refractive index, are combined in an interpenetrating polymer network (IPN) structure forming a thermoplastic composition having optical clarity/compatibility and facilitating low cost formation by molding or thermoforming. The first polymer component is a block co-polymer from first and second monomers. The resulting lens composition has a flexure modulus in the range of about 2,000-50,000 psi; preferably about 5,000-40,000 psi; and more preferably about 20,000-40,000 psi. In one embodiment, the lens comprises a central portion and an annular portion of different characteristics.
September 4, 1996
Date of Patent:
August 4, 1998
Rasor Associates, Inc.
Donald R. Ingenito, Henry F. Rugge, David S. Soane, William L. Sturm
Abstract: An intralinked polyamidoamine which is nonthermosetting and endcapped. This intralinked polyamidoamine is the reaction product of a dicarboxylic acid or dicarboxylic acid derivative, a polyamine, an endcapping agent, and an intralinker.
Abstract: A graded-refractive-index optical plastic material composed of an amorphous fluoropolymer and at least one material which differs from the polymer in refractive index by at least 0.001, wherein the material is so distributed as to have a concentration gradient in a specific direction, and a method for its production.
Abstract: Disclosed are thermoplastic polyurethanes obtainable by reacting (a) a polyester-polyol that satisfies all the following requirements (1) to (4):(1) its ester group content (number of ester bonds/number of all carbon atoms) is from 0.08 to 0.17;(2) it has hydroxyl groups of from 2.01 to 2.08 per one molecule;(3) it has a number average molecular height of from 1000 to 7000; and(4) it has a crystallization enthalpy (.DELTA.H) of 70 J/g or less,(b) an organic diisocyanate and (c) a chain extender at a ratio that satisfies the following numerical formula (i):1.00.ltoreq.b/(a+c).ltoreq.1.
Abstract: The present invention provides a coated polyester fiber fabric, produced by coating a polyester fiber structure dyed by a disperse dye, with a resin, comprising an organic peroxide in said coating resin. The present invention also presents a coated polyester fiber fabric, produced by coating a polyester fiber structure dyed by a disperse dye, with a resin, comprising aromatic rings in said coating resin. The present invention furthermore presents a process for preparing a coated polyester fiber fabric, comprising the step of coating a polyester fiber structure dyed by a disperse dye, with a resin solution containing an organic peroxide. The coated polyester fiber fabric of the present invention has excellent fastness against dye migration and staining, and washing durability. On the other hand, the process of the present invention allows said coated fabric to be very simply and stably produced without using any special apparatus, and hence is industrially very effective.
Abstract: Multilayer polymeric film comprising a base layer of a propylene polymer, a non-voided intermediate layer on the base layer, and a heat sealable polymer layer on the intermediate layer, the non-voided intermediate layer having an internal cohesive strength less than the bond strength of the intermediate layer to either the base layer or the heat sealable layer and less than the internal cohesive strengths of either the base layer or the heat sealable layer. Such films enable peelable heat seals to be formed by rupture of the intermediate layer due to its lower internal cohesive strength compared with the core layer or the heat seal layer.
Abstract: Fiber fleeces made entirely of pure artificial (polymeric) fibers or mixed with natural fibers have to be solidified after formation by carding, or laying only in the case of filament fleeces. In the fleece according to the invention, which is particularly bulky and thus needs to be solidified, neither lower-melting binding fibers nor chemical binding agents are used. Also, the mechanical needling process which uses needles is eliminated because this reduces the bulk too severely. The desired bulk is retained by producing solidification by a single water needling process (when performed on one side), with the desired water pressure being no higher than 60 bars, preferably 20-30 bars.
Abstract: This invention provides a heat-sealable, peelable composition comprising ethylene vinyl acetate copolymer, polyethylene based wax and polypropylene. The composition can further comprise a dye or an ink. The composition can be heat-sealed onto a surface of a polymeric bag to provide a peelable seal.A closure arrangement for a polymeric bag with first and second opposing films comprises first and second opposing base strips, a first peelable strip of a first color, and a second peelable strip of a second color. An outer surface of the first base strip is attached to an inner surface of the first film. An outer surface of the second base strip is attached to an inner surface of the second film. The first peelable strip is attached to the inner surface of the first base strip, and the second peelable strip is attached to the inner surface of the second base strip. The first and second peelable strips are disposed between the first and second base strips.
Abstract: A method and apparatus for extrusion coating a nylon fabric or the like. The apparatus includes a supply roll for supplying a length of fabric having a top and bottom surface and a take-up roll for taking up the length of fabric. An extrusion coating head located between the supply roll and the take-up roll and perpendicular to the movement of the length of fabric applies a plastic coating onto one surface of the length of fabric. A combining roll located between the supply roll and the take-up roll and adjacent to the extrusion coating head joins the plastic coating to the one surface of the length of fabric. In the preferred embodiment, the combining roll is heated to provide improved adhesion of the plastic coating onto the surface of the length of fabric while, at the same time, a water mist prevents sticking. The resulting fabric has a tear strength of greater than about 50 pounds and a weight of less than about 5.5 oz. per sq. yd.
September 29, 1995
Date of Patent:
June 9, 1998
Highland Industries, Inc.
Michael D. Bertolucci, Earl T. Crouch, Keith N. Gray
Abstract: A medical method and dressing for application and maintenance of medication on healthy, damaged diseased or infected living tissue. Medication is applied to body tissue and then coated with a bioadhesive providing medication maintenance on tissue and protection from body and other liquids or abrasion thereby preventing removal of the medication during a healing or treatment process.
Abstract: High strength fiber reinforced ceramic composites having low dielectric constants stable against high temperatures are made possible by post oxidation of 35-60 volume percent ceramic matrix enveloping 20-60 volume percent ceramic fiber.
Abstract: An insulating spacer for use in glazing assemblies is provided. The spacer comprises a foamed insulating body and further includes a second sealant material. The insulating body partially contacts the substrates as does the sealant to provide a double seal when used in a glazing assembly. In other embodiments the spacer is a composite of foam, sealant material, rigid plastics and desiccated matrices. A further embodiment discloses an undulating foam spacer body for easy manipulation about the corner in glazing assemblies. The result of incorporation of the foam is a substantially energy efficient spacer and assembly.
Abstract: A graded-refractive-index optical plastic material composed of an amorphous fluoropolymer (a) which substantially has no C-H bond and at least one material (b) which differs from the fluoropolymer (a) in refractive index by at least 0.001, wherein the material (b) is distributed in the fluoropolymer (a) so as to have a concentration gradient in a specific direction.