Showing papers on "Polymer blend published in 1970"

Method of separating an insoluble liquid from polymer composition

Abstract: Apparatus and method for separating a substantially insoluble liquid from a mixture containing a polymer or polymer mixture. The liquid is a vapor at the usual temperature and pressure of the polymer extrusion operation and is kept in liquid form by providing a high pressure region in the extruder. A liquid outlet is provided upstream of the high pressure region and the liquid is maintained under pressure and taken off as a liquid. The pressure-maintaining means may be a liquid outlet provided with a pressure control valve, trap or the like.

Hot-melt adhesive polymer blends

Abstract: IMPROVED HOT-MELT ADHESIVES COMPRISING POLYESTERS BLENDED WITH POLYOLEFINS OR VINYL POLYMERS AND ARTICLES SECURED THEREWITH. THE POLYESTERS OF 1,4-BUTANEDICAL AND TEREPHTHALIC OR TRANS-1,4-CYCLOHEXANE DICARBOXYLIC ACID, BLENDED WITH POLYSTYRENE ARE PREFERED ADHESIVE COMPOSITIONS.

Stabilized polymer blends

Abstract: THE USE OF UP TO 20% BY WEIGHT OF ORGANIC ANHYDRIDES AS STABILIZERS IN POLYMER COMPOSITIONS CONTAINING AT LEAST 50 MOLE PERCENT OF POLYMERIZED UNSATURATED NITRILES SUCH AS ACRYLONTRILE AND METHACRYLONITRILE, AND AT LEAST 5% BY WEIGHT OF A DIENE RUBBER. THE ANHYDRIDES ARE SELECTED FROM ANHYDRIDES OF CYCLIC DICARBOXYLIC ACIDS, POLYMERIC ANHYDRIDES AND POLYMERIC ACIDS WHICH LOSE WATER ON HEATING TO FORM POLYMERIC ANHYDRIDES.

Shaped and molded articles of polymer blends comprising polyolefins and lactone polymer

Abstract: MOLDED AND SHAPED ARTICLE COMPRISING SOLID OLEFIN POLYMERS, PARTICULAR CRYSTALLINE ALKENES, AND SOLID CYCLIC ESTER POLYMERS SUCH AS FIBERS, FILMS, WIRE AND CABLE COATINGS, AND THE LIKE WHICH EXHIBIT OR POSSESS IMPROVED DYEABILITY, STRESS CRACK RESISTANCE, LOW HAZE, AND HIGH GLOSS, AND/OR HIGH LIGHT TRANSMISSION.

Method for preparing vinyl halide homopolymers having improved processing characteristics

Abstract: Vinyl halide homopolymers, particularly polyvinyl chloride, which exhibit improved processing characteristics without sacrificing physical properties are prepared by partially polymerizing a vinyl halide monomer at an initial temperature level whereupon the reaction temperature is then raised and the polymerization is continued at this increased temperature level preferably while in the presence of a chain transfer agent so as to obtain a polymer having an average molecular weight range different from that obtainable at the first reaction temperature. The resulting polyvinyl chloride provides the physical characteristics of polymer blends but can be processed much more readily than a mechanical blend of homopolymers of varying molecular weights, fusing more easily and without the undesirable formation of fish eyes.

Thermoplastic polymer alloy

Abstract: AN ALLOY OF THERMPOLASTIC POLYMER IS PROVIDED BY A BLEND OF (A) A POLYLACTAM-POLYARYLENE POLYETHER BLOCK COPOLYMER AND (B) POLYLACTANS AND/OR POLYARYLENE POLYETHERS.

Dynamic melt properties of polymer blends

Abstract: The dynamic mechanical properties of blends of polymer melts were measured using the orthogonal rheometer. Two-phase blends, polyethylene-polystyrene, polyethylene-poly-(methylmethacrylate), and polystyrene-polymethylmethacrylate, were studied. The in-phase and out-of-phase moduli were measured over the range of composition and at frequencies between 10−4 and 10 revolutions/sec. The out-of-phase modulus increases in a monotonic manner with composition. The in-phase modulus, however, shows a maximum with composition in two cases. Examination of the relaxation spectra of these blends shows that when no maximum occurs it can be written as an additive function of the spectra of the components. In the case where a maximum is observed in the modulus the measured spectrum of the blend is shifted in frequency relative to the calculated one. This is tentatively attributed to slight interpretation and solubility of one phase in the other in these cases.

Alpha-olefin polymer compositions

Abstract: A-OLEFIN POLYMER COMPOSITIONS CHARCTERIZED BY AFFORDING FILMS HAVING A LOW COEFFICIENT OF FRICTION, A LOW BLOCKING FORCE, AND NO BLOOMING HAVE BEEN DEVELOPED BY INCORPORATING THEREIN ABOUT 0.01 TO 5.0% BY WEIGHT OF AN AMIDE HAVING THE FORMULA: R-NH-CO-R''-OH WHEREIN R IS AN ALKENYL RADICAL HAVING 18 TO ABOUT 22 CARBON ATOMS AND R'' IS A DIVALENT HYDROCARBON RADICAL CONTAINING 3 TO 15 CARBON ATOMS.

Effects of mixing states on physical properties of vulcanizates of polybutadiene rubber-general purpose polystyrene resin blend

Abstract: The effects of the continuous phases of general purpose polystyrene resins upon the physical properties of the vulcanizates were studied using the polybutadiene rubber–general purpose polystyrene resin blend. The unvulcanized samples were prepared according to the method already mentioned in our previous report,1 and the radiation cure was adopted so that a change of state during cure might be avoided. Some physical properties like hardness, modulus, elongation, permanent set, and resilience are much influenced by the existence of the continuous phases even if the polymer blend ratios are kept constant, whereas tensile strength at failure is mainly determined by the polymer blend ratio. The physical properties which belong to the former group are found to be controlled more strongly by the polymer which forms the continuous phase.

Plasticized vinyl chloride polymer blends having improved fire retardancy

Abstract: PLASTICIZER COMPOSITIONS AND IMPROVED FIRE RETARDANT, PLASTICIZED LOW-TEMPERATURE FLEXIBLE, HIGH TENSILE PROPERTIED VINYL CHLORIDE POLYMER BLENDS CONTAINING SUCH COMPOSITIONS, AS WELL AS SHEETS AND FILMS MADE THEREFROM THESE PLASTICIZER COMPOSITIONS EMPLOY A COMBINATION OF TWO DIFFERENT HALOGENATED HYDROCARBONS AND TWO DIFFERENT TRISUBSTITUTED ORGANO PHOSPHATES

Abs polymer blends for high-shear processing

Abstract: When a small amount of a relatively low molecular weight terpolymer of styrene, acrylonitrile and a saturated higher fatty alcohol ester of acrylic acid or methacrylic acid is incorporated into a conventional high impact grade ABS thermoplastic resin, the resin blend may be more readily subjected to high-shear forming processes to produce high-quality parts. The presence of the terpolymer in an ABS resin melt improves melt flow properties in extrusion or injection molding operations by markedly reducing melt viscosity and increasing melt stability.

Study of Polymer Blends as a Vibration Damper

Abstract: Metallic materials have too small internal friction to damp vibration making noise, whereas plastics show remarkably large damping capacity in some characteristic temperature ranges where a considerable part of the vibrational energy is consumed as a result of molecular friction. If the two kinds of materials are combined, one can expect that the vibration of the composite materials will be damped to a greater extent than that of the metal itself. In this study dynamic mechanical properties of a variety of polymer blends were measured and those which have a broad E″ peak around 0°C were chosen from among them. Sandwich structures of Al/polymer/Al type were then constructed and the dynamic mechanical properties of the composite systems were measured by means of a vibration reed technique. It was found that the sandwich structures with these polymer blends had larger damping capacity than that with poly (vinyl acetate) or Al itself.

Methyl methacrylate polymers for the production of artificial teeth

Abstract: 1,202,046. Methyl methacrylate bead polymers. G.M.W. LABORATORIES Ltd. 3 Jan., 1968 [16 Jan., 1967], No. 49994/69. Divided out of 1,202,045. Heading C3P. Methyl methacrylate is polymerized in suspension in the presence of a refractory oxide to produce polymer beads suitable for use in the manufacture of abrasion-resistant artificial teeth. Refractory oxides specified are silica, zirconium oxide and calcined alumina. Polymerization is preferably effected in an aqueous medium which may contain a protective colloid such as gelatin, cellulose, sodium polymethacrylate or starch. If desired, a methyl mothacrylate monomer/polymer mixture can be used for the polymerization. Benzoyl peroxide is illustrated as a polymerization catalyst.

Flame-retarded polymer compositions

Abstract: FLAME-RETARDED COMPOSITIONS COMPRISING A THERMOPLASTIC POLYMER AND A FLAME-RETARDING AMOUNT OF 1,1,4,4TETRAKIS (2-CYANOETHYL)-1,4-DIPHOSPHONIACYCLOHEXANE DIBROMIDE OR DIIODIDE, ARE DISCLOSED.

Thermal Interaction in Polymer Blends consisting of two Separate phases

Abstract: プラスチック相をなすポリスチレン (PS) 中に, ゴム相が独立した相として分散した系では, 分散媒PS相のガラス転移温度Tgは, PS単独のTgよりも高温へ移動することが, 分散相として, ポリブタジエン (PBD), スチレン・ブタジエンゴム (SBR), アクリルニトリル・ブタジエンゴム (NBR), ポリ酢酸ビニル (PVAc), 酢酸ビニル・塩化ビニル共重合体 (VAc/VC), ポリ塩化ビニル (PVC) を含む混合系に共通に観察された。このTg上昇現象は, ポリメタクリル酸メチル (PMMA), ポリ塩化ビニル (PVC), スチレン・アクリルニトリル共重合体 (St/AN, AN; 25%) とSBRまたはPBDとの混合系における前者 (プラスチック相) のTgにも見出された。しかし, St/AN共重合体 (AN; 50%), ポリカーボネート (PC) のTgは, これをゴム相と混合しても変化しなかった。したがって, これは, プラスチック相分散媒ポリマーの構造的特性によるものと考えられる。PSと一連のゴムとの混合系において, PSのTg上昇度は, PSとゴムとの熱膨張係数の差が大きいほど大きいことがわかった。プラスチック相およびゴム相をなす2相の各成分ポリマーが熱膨張する場合, 成分ポリマーの熱膨張係数の相違により, ガラス状態にある分散媒ポリマーは, ゴム状態にある分散相ポリマーより熱応力を受け, これがTgの上昇をもたらすと考えられる。この概念により定性的には, Tg上昇現象を説明できたが, なお二三の基本的疑問が残る。

Coating flat articles with polymerisable - mixtures and hardening

Abstract: Flat articles, particularly slabs, of absorbent materials (wood, cardboard, asbestos) are wetted or soaked wit a liquid consisting of one or more liquid, polymerisable organic compounds, pref. methyl methacrylate; one or both uter surfaces of the article are coated while wet with an even layer of a finely divided, spreadable thermoplastic (co)polymer or polymer blend which is soluble or swells in the liquid, such as methyl methacrylate (co)polymer; and subjected to high temps. and pressures.

Heterogeneous polymer mixture

Abstract: 1299742 Polymerizing within the pores of a foamed polymer FARBENFABRIKEN BAYER AG 18 Nov 1969 [29 Nov 1968] 56270/69 Heading C3P [Also in Division B2] A heterogeneous polymer mixture of interpenetrating coherent phases comprises a first polymer in the form of a foam, and a second polymer filling the pores of at least a part of the foam of the first polymer, the first and second polymers each forming a coherent phase, and the second polymer having been polymerized within the pores of the first polymer in the absence of compression. The foam is preferably open pored to the extent of 5-100% by volume. The second polymer may be made from a mixture of monomers, which may be in solution. The foam may be of, for example, a polyamide, a polyolefin, a urea-formaldehyde resin, a phenolformaldehyde resin, a polyester-urethane resin a polyether-urethane resin, a cured unsaturated polyester resin, polyvinylchloride, polystyrene or a polyurethane. The second resin may be, for example an epoxy resin, a polymer of a vinyl compound such as styrene, or a mixture of styrene with comonomers such as fumaric acid and maleic acid esters, acrylic and methacrylic esters, or a mixture of styrene with an unsaturated polyester, a polyurethane, a lactam polymer, or a polyamide. In the examples (1) and (2) a polyamide foam is impregnated with a styrene/diethylfumarate mixture which is polymerized; (3) a maleic anhydride/phthalic anhydride/propylene glycol unsaturated polyester and styrene are polymerized in a phenolformaldehyde resin foam; (4), as in (3) but using a urea-formaldehyde resin foam and (5), as in (3) but using a polyester-urethane foam.