Showing papers on "Thermoplastic published in 1973"

Process for preparing a thermoplastic microporous film involving a cold stretching step and multiple hot stretching steps

Abstract: A process for the preparation of an open-celled microporous polymer film. The process includes the steps of cold stretching a non-porous, crystalline, elastic film significantly below the polymeric crystalline melting point of the polymer. The cold stretched film is then stretched, at a temperature slightly below the polymeric crystalline melting point of the film. The hot stretching procedure embodies a plurality of discrete sequential stretching operations.

Polyester/polycarbonate/graft copolymer thermoplastic resin composition

Abstract: A thermoplastic resin composition which comprises A. 25 to 85 percent by weight of an aromatic polyester, B. 10 to 75 percent by weight of an aromatic polycarbonate, and C. 2 to 35 percent by weight of a graft copolymer of a butadiene polymer-vinyl monomer, THE PROPORTION OF THE BUTADIENE POLYMER COMPONENT IN THE GRAFT COPOLYMER BEING 1 TO 30 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF THE COMPONENTS (A), (B) and (C).

Low shrink thermosetting polyesters

Abstract: This invention pertains to a one-component, low shrink molding resin system comprising a thermoplastic, branched alkyd in combination with a thermosetting dicyclopentadiene modified polyester resin. The low shrink molding resin systems are stabilized dispersions wherein the branched thermoplastic alkyd is dispersed within the dicyclopentadiene polyester resin (polyester polymer + monomer) to provide a uniform dispersion. The low shrink molding resin system can be thickened with alkaline earth and/or hydroxide thickeners suitable for use in low shrink molding compositions for producing low-profile molded parts.

Flame resistant thermoplastic polyesters

Abstract: Flame resistant polycondensation products from aromatic or aliphatic dicarboxylic acids, diols and diphosphinic acid structural units suitable for making shaped articles by molding, injection molding or extrusion.

Thermoplastic resin composition including wood and fibrous materials

Abstract: A thermoplastic resin composition is disclosed for use as structural, packing and other industrial materials. The composition essentially comprises thermoplastic resins, wood materials, synthetic, inorganic or regenerated fibrous materials and preferably synthetic or natural rubbery materials.

Process for preparing filled, biaxially oriented, polymeric film

Abstract: A process for preparing a thermoplastic film having a void content of at least about 30 to 70%, a fibrous surface having about 2 to 40 surface ruptures per square millimeter, and an oxygen permeability of about 900 to 10,000,000 cc./100 sq.in./24 hrs./atmosphere/mil by: 1. MELT-BLENDING A C2-C10 Alpha -monoolefin polymer and about 26 to 50 weight percent inert filler, based on the total weight of polymer and filler; 2. FORMING A FILM FROM THE MELT BLEND; 3. COOLING THE FILM TO A TEMPERATURE BELOW THE MELTING POINT; 4. STRETCHING THE FILM AT LEAST ABOUT TWICE ITS ORIGINAL FORMING DIMENSIONS IN MUTUALLY PERPENDICULAR DIRECTIONS WHILE THE FILM TEMPERATURE IS ABOVE THE LINE-DRAWING TEMPERATURE AND BELOW THE POLYMER MELTING TEMPERATURE UNTIL THE FILM HAS AT LEAST ABOUT 30% VOIDS; AND 5. COOLING THE FILM TO ROOM TEMPERATURE.

Thermoplastic blend of partially cured monoolefin copolymer rubber and polyolefin plastic

Abstract: Thermoplastic blends of partially cured monoolefin copolymer rubber (such as EPM or EPDM rubber) with a polyolefin resin (such as polypropylene) exhibit good physical properties and are reprocessable. The partial cure of the rubber is effected by heating the rubber with a curative such as a peroxide. The blends are used to make molded or extruded articles which have good physical properties without requiring vulcanization; preferred blends have the characteristics of thermoplastic elastomers.

Thermoplastic polyurethane hydrolysis stability

Abstract: This paper reviews several types of thermoplastic polyurethane elastomers, and the unique properties these polymers have. In discussing the hydrolysis stability of thermoplastic polyurethane elastomers the suitability of these polymers for such study was pointed out. A relationship between poly(ester-urethane) composition in terms of methylene group concentration, hardness and chain stiffness, and hydrolysis stability was shown. The dominant role of polyurethane acid number in thermoplastic poly(ester-urethane) hydrolysis stability was demonstrated and the origin of this unexpected acid number was discussed. The pronounced stabilizing action of added poly(carbodiimide) in thermoplastic poly(ester-urethane) hydrolysis was shown, as well as the severe destabilizing action of a carboxylic acid, stearic acid. The hydrolysis stabilities of thermoplastic poly(ester-urethane) elastomers based on poly(ϵ-caprolactone) glycol and on poly(hexamethylene carbonate) glycol were also described.

Permeable flexible plastic tubing

Abstract: Flexible tubing, particularly suitable for irrigation purposes, consists of a plurality of superposed, elongated, flexible strips, heat sealed along their longitudinal edges and is substantially flat when empty. At least one of said strips is thermoplastic and at least one has a permeable, fibrous structure and is preferably formed from a non-woven fabric such as spun-bonded polyethylene fiber.

Synthetic resinous tube

Abstract: A synthetic resinous tube having a plurality of bonded coaxial layers with at least one layer being thermoplastic and another substantially non-thermoplastic is formed by the simultaneous coaxial extrusion of thermoplastic tubes and electron irradiation of one of the layers of the tube to convert it from a thermoplastic resin.

Tick and flea collar of solid solution plasticized vinylic resin-carbamate insecticide

Abstract: Solid pesticidal composition comprising a solid, substantially non-volatile carbamate and a plasticized solid thermoplastic resin characterized by being essentially dry and providing self-replenishing of carbamate particles on the surface of the composition to provide continuous control of ectoparasites on animals.

Method for sealing shell-like thermoplastic objects

Abstract: Thermoplastic shell-like objects are joined or repaired by supporting the area of the object to be treated, applying a preheated, reinforced thermoplastic charge and exerting pressure against the support to seal the desired area.

Reclamation of fabric supported thermo-plastic sheet scrap

Abstract: Thermoplastic chips are produced from sheet scrap, the sheet including a layer of thermoplastic resin and a fabric backing attached thereto. The sheet is granulated into a first particulate mixture of thermoplastic chips, chopped fabric, lint and fly. That mixture is then fed into a cyclone where a major portion of the lint and fly is separated and drawn off from the first mixture leaving a second particulate mixture primarily comprising thermoplastic chips and chopped fabric. This second mixture is then fed into a specific gravity air separator wherein an air stream (1) separates substantially all of the chopped fabric from the thermoplastic chips, and (2) conveys the chopped fabric out of the air separator while the heavier thermoplastic chips fall through the air stream and are removed from the air separator, yielding essentially fiber-free thermoplastic chips, usable with or instead of virgin thermoplastic resin.

Hollow, multi-layered, cross-linked plastic structures and process for producing same

Abstract: Hollow, multi-layered plastic structures are provided comprising a layer of thermoplastic polyester material and a layer of polyethylene, the polyethylene and polyester layers being cross-linked together at their interface. A process for producing such structures which comprises charging a mold with thermoplastic polyester material, rotating and heating the mold so as to fuse and form a layer of the polyester material on the inner surface of the mold, cooling the mold to a point below the melting point of the polyester but above the melting point of a subsequently added cross-linkable polyethylene material, stopping the rotation and charging the mold with the cross-linkable polyethylene material, resuming the rotation of the mold and heating it to a temperature sufficient to fuse and cross-link the polyethylene with the polyester layer, cooling the mold to a point below the melting point of the polyethylene and removing the finished structure from the mold.

Grass-like pile product

Abstract: SYNTHETIC GRASS PRODUCTIONS OF IMPROVED QUALITY ARE MADE OF THERMOPLASTIC MONOFILAMENT RIBBONS HAVING A CROSS SECTION IN WHICH THE RIBBONS ARE THICKEST AT THE CENTER, AND TAPER OFF TOWARD BOTH EDGES AND WHICH HAVE A STEM-LIKE PROJECTION ABOUT ITS CENTER ON BOTH SIDES OF THE TAPERED PORTION. THE SYNTHETIC GRASS PRODUCTS ARE PRODUCED BY CONVENTIONAL TUFTING, WEAVING, KNITTING, OR FLOCK-COATING TECHNIQUES AND HAVE RESILIENT SYNTHETIC FOAM ATTACHED TO THE BACKING ON THE SIDE OPPOSITE TO THE EXTENDING RIBBONS.

Apparatus for producing hollow molded articles

Abstract: Apparatus for producing hollow molded articles includes means for injecting thermoplastic material into a mold cavity formed by a core, neck mold, and cavity mold to form a parison. The core is then released from the cavity mold and the parison, and the latter, while still attached to the neck mold is released from the cavity mold and moved by a transferring device to an intermittently operated rotatable carrier. This carrier moves the parison and neck mold to a station where a stretching rod is inserted into the parison. The parison is then reheated close to its melting temperature, and thereafter the parison is stretched in one direction and is blown in a blow mold to form a hollow molded article.

Process for manufacturing a porous thermoplastic resin article reinforced by a glass matt

Abstract: Thermoplastic resin is mixed with glass fibre matt or matts, and the resulting mixture is heated above a temperature at which the resin is at least molten on its surface and compressed to form a shaped article. Thereafter, the shaped article is maintained in a temperature more than flowing temperature of the resin, and in that state pores are formed in the article by restoring force of the glass fibres in order to obtain a porous thermoplastic resin article reinforced by glass fibre matt.

Heat activated transfers

Abstract: A heat transfer material on polyethylene terephthalate base has an overall layer of an essentially unpigmented hard acrylic resin and a thermoplastic image in printing ink on the acrylic resin layer.

Filter for tobacco smoke

Abstract: A tobacco smoke filter comprising a single filter element consisting wholly of a plurality of randomly-oriented non-crimped smooth-surfaced solid fibers of thermoplastic polymeric non-absorbent material, each of the fibers having a uniform diameter less than about 5 microns. The filter element has a generally circular cross-section taken across the intended flow path of the tobacco smoke and a diameter substantially equal to the diameter of a tobacco smoke flow path. The weight of polymeric material exceeds about 6 mg and the filter element has a pressure drop thereacross of from 1 to 10 inches of water at a flow rate of 17.5 ml/sec.

Multi-layer thermoplastic film and method of making same

Abstract: An improved polymeric composition comprising a blend of polybutene-1 with an ethylene-propylene copolymer which, when combined with a shrinkable, cross-linked polymer of ethylene, produces a laminate having improved abuse and tear resistance and reduced self-adherence.

Method for molding and sealing thermoplastic containers

Abstract: 1. Method of making a container fabricated of thermoplastic material having at least one neck terminating in a protective cap covering a breachable sealing membrane said cap and said membrane being integrally formed with said container comprising: vertically extruding a heat softened tubular thermoplastic member into a vertically aligned and contiguous first confining zone and second confining zone; pinching closed the said tubular member near substantially the bottom of said second zone; forming at least two neck-like constrictions from said tubular member substantially at the top of said second zone; pinching closed, to form an integral breachable sealing membrane, all but one of said neck-like constrictions substantially near the top thereof; severing said tubular member near substantially the top of said first zone, thereby providing each neck-like constriction with an upwardly extending tubular portion; providing fluid pressure through the neck-like constriction with an upwardly extending tubular portion; providing fluid pressure through the neck-like constriction not pinched closed whereby the tubular member is inflated to the extent permitted by said second confining zone; then pinching closed the severed upwardly extending tubular portion and forming a removable cap from the closed tubular portion above the said breachable sealing membrane; and, pinching closed the severed upwardly extending tubular portion extending upwardly from the neck-like constriction through which fluid pressure was provided and forming a removable cap from closed tubular portion.

Filled thermoplastic containing fibrous dispersion aid

Abstract: The addition to filled thermoplastic resin systems of small amounts of fibrous material, of aspect ratio at least about 10 times the aspect ratio of the filler, facilitates dispersion and processing of these filled compositions into shaped articles and gives a product exhibiting superior surface properties.

Pressure-fixable developing powder containing a thermoplastic resin and wax

Abstract: A pressure-fixable developing powder comprising a wax component and a thermoplastic resin, the powder having defined physical characteristics.

Method of applying metal filaments to surfaces

Abstract: Method of applying metal filaments to a surface comprises forming a network composed of metal filaments entwined with nonconducting thermoplastic filaments, stabilizing the network by bonding the filaments at their junctions to form a selfsupporting element and fusing the element as a whole with a plastic sheet which is then applied to a surface.

Poly(arylene sulfide) resin heat treatment and curing

Abstract: The processing characteristics of poly(arylene sulfide) resins are improved by incorporating therein a small effective amount of at least one sulfur-containing compound selected from sulfur acids and sulfonyl halides and heating at a temperature below the melting point of the polymer under an inert atmosphere. The aromatic sulfide polymers treated in accordance with the invention retain their thermoplastic nature and can be used in a variety of industrial applications, e.g., as molding compositions.

Solid heat-flowable dispersed phase in a crosslinked elastomer

Abstract: .Iadd.Heat recoverable articles of manufacture made from organic polymeric compositions are described. The compositions comprise a mixture of a thermoplastic resin material, or other organic, normally solid heat-flowable material, in an elastomeric material. A heat recoverable article obtained from these compositions is elastomeric in both its heat-unstable and heat-stable states. .Iaddend.

Thermoplastic films based on blends of polypropylene and polybutene

Abstract: A biaxially oriented thermoplastic film structure formed from a resinous blend comprising polypropylene and polybutene, polybutene being present in an amount of more than 10% but less than 20% by weight, based upon the total weight of the blend.

Method for rotational molding of composite foamed plastic articles

Abstract: A method for rotational molding of plastic articles which comprises charging powder or plastisol of thermoplastic material in an airtight mold and heating the mold with pressurized steam while rotating the mold, followed by cooling