Showing papers on "Polymer blend published in 1968"

Polyimide compositions and metallic articles coated therewith

Abstract: Polymer-metal laminate composites having improved adhesion between metallic and polymer laminae, the polymer consisting essentially of a mixture of a polyimide and a polyimide containing amide groups along the backbone of the polymer chain; and compositions adapted to making such laminates, containing the said polymer mixture in solution in a suitable solvent.

Heat-shrinkable films from ethylene polymer blends

Abstract: HEAT-SHRINKABLE FILM HAVING IMPROVED HEAT SEALING CHARACTERISTICS PREPARED BY IRRADATIVE CROSS-LINKING OF AN ORIENTED FILM OF A BLEN OF LOW DENSITY AND HIGH DENSITY ETHYLENE POLYMERS.

Antistatic shaped articles containing polyetherpolyamide block copolymer and a polyamide polyester or polyolefin

Abstract: A SYNTHETIC RESIN POLYMER SAUCH AS POLYMER, POLYESTER AND POLYOLEFIN AND POLYETHER-POLYAMIDE BLOCK COPOLYMER ARE SHAPED IN A BLENDED CONDITION TO OBTAIN A SHAPED ARTICLE, IN THE SHAPED ARTICLE, THE BLOCK COPOLYMER IS DISPERSED IN THE FORM OF SLENDER PARTICLES AS AN INDEPENDENT PHASE WHEREIN THE LONGITUDINAL AXES OF THE PARTICLES ARE ARRANGED IN PARALLEL RELATIONSHIP WITH THE DIRECTION OF THE MOLECULAR ORIENTATION OF THE SHAPE ARTICLE,F AT LEAST 80% BY WEIGHT OF THE DIPERSED PARTICLES OF THE BLOCK COPOLYMER HAVE A DIAMETER AT CROSS SECTION OF NOR MORE THAN 1.0 MICRON AND A LENGTH IN THE DIRECTION OF LINGITUDINAL AXES AT LEAST 20 TIMES THE DIAMETER AT CROSS SECTION. POLYMER BLEND SHAPED ARTICLES HAVING SUCH AN INTERNAL STRUCTURE HAVE VERY EXCELLENT PROPERTIES AS A SYNTHETIC RESIN AND ALSO EXCELLENT ANTISTATIC PROPERTIES.

Blend of ethylene polymer crystalline polypropylene polymer and crystalline ethylene-propylene block copolymer

Abstract: THE PRESENT NOVEL POLYMER COMPOSITION COMPRISES (A) 50 TO 95% BY WEIGHT OF ETHYLENE POLYMER HAVING A DENSITY OF AT LEAST 0.94 OF STATISTICAL COPOLYMER OF ETHYLENE CONTAINING NOT MORE THAN 10% BY WEIGHT OF A-OLEFIN, OR A MIXTURE THEREOF, (B) 2 TO 40% BY WEIGHT OF HIGHLY ORIENTED CRYSTALLINE POLYPORPYLENE CONTAINING AT LEAST 80% BY WEIGHT OF BOILING-HEPTANE INSOLUBLES OR STATISICAL COPOLYMER OF POLYPROPYLENE CONTAINING NOT MORE THAN 10% BY WEIGHT OF A-OLEFIN, OR A MIXTURE THEREOF, AND (C) 3 TO 40% BY WEIGHT OF BLOCK COPOLYMER OF ETHYLENE AND PROPYLENE, AND HAS A GOOD FLOW CHARACTERISTIC AND GOOD PROCESSABILITY. THE PRODUCT OBTAINED FROM THE PRESENT COMPOSITION IS EXCELLENT IN BOTH IMPACT STRENGTH AND RIGIDITY AND HAS HIGHLY BALANCED PHYSICAL PROPERTIES. AS A RESULT, SHAPED ARTICLES, FILMS, ETC. CAN BE READILY PRODUCED AT LOW COSTS FROM THE PRESENT COMPOSITION.

Novel interpolymer blends

Abstract: Disclosed herein are polymer blends comprising a first interpolymer of a vinyl alcohol ester and at least one ethylenically unsaturated acid ester and a second interpolymer comprising a vinyl aromatic compound, at least one ethylenically unsaturated acid ester and at least one compound containing one or more acid groups. These blends are particularly useful as binders and adhesives.

Study of Polymer Blends. II. Blending SBR Varying in Styrene Content with Polybutadiene

Abstract: For this study of effect of SBR styrene content on blends of SBR and BR, polymer solubility was investigated by phase contrast microscopy, dielectric loss, and dynamic characteristics. Physical properties of blended rubber were also measured.

Process for making impact resistant blends and polymer blends produced thereby

Abstract: A novel graft copolymer blend is prepared having an ethylene interpolymer rubbery substrate and a graft superstrate of an interpolymer of a monovinylidene aromatic hydrocarbon, an alkyl (alk)acrylate, and/or an ethylenically unsaturated nitrile. The ethylene interpolymer contains vinyl chloride and/or vinylidene chloride. The superstrate may be of uniform polymeric composition or it may be formed by two or more different polymers having differing polarity. Blends of such graft copolymer blends with vinyl chloride polymers having a high degree of transparency are also disclosed.

Improvements in and relating to heat shrinkable products

Abstract: A polymer blend comprises a blend of a copolymer of vinylidene fluoride and hexafluoropropylene and from 5 to 50%, calculated on the total weight of the blend, of a crystalline fluoro-, homo- or copolymer or a crystalline homo- or copolymer of ethylene or propylene. Suitable crystalline polymers are polytetrafluoroethylene, polychlorotrifluoroethylene, a fluorinated ethylene or propylene copolymer and polyvinylidene fluoride. Both the copolymers of the blend may be cross-linked. The blend may be used to form articles which have elastic memory, e.g. heat-shrinkable harness moulds for electrical wiring. In the examples, blends comprising (1) polyvinylidene fluoride, magnesium oxide, carbon black, a peroxide and triallyl cyanurate (2-5) polyvinylidene fluoride, magnesium oxide, carbon black, silica, dibasic lead phosphate, a peroxide, zinc oxide, triallyl cyanurate and polyethylene are prepared.

Process for producing polymer blends

Abstract: PROCESS FOR PRODUCING A UNIFORMLY MIXED POLYMER BLEND OF A GREAT UTILITY AS A RUBBER MATERIAL FOR PRODUCING VARIOUS RUBBER PRODUCTS WHICH COMPRISES COPOLYMERISING A CONJUGATED DIOLEFIN WITH A MONOVINYLSUBSTITUTED AROMATIC COMPOUND TO PRODUCE A RANDOM COPOLYMER OF THE CONJUGATED DIOLEFIN AND THE MONOVINYLSUBSTITUTED AROMATIC COMPOUND HAVING A CONTENT OF THE MONOVINYL-SUBSTITUTED AROMATIC COMPOUND OF 50-95% BY WEIGHT IN THE PRESENCE OF A CONJUGATED DIOLEFIN HOMOPOLYMER OR A RANDOM COPOLYMER OF A DIOLEFIN AND A MONOVINYL-SUBSTITUTED AROMATIC COMPOUND HAVING A CONTENT OF A MONOVINYL-SUBSTITUTED AROMATIC COMPOUND OF NOT MORE THAN 40% BY WEIGHT, DISSOLVED IN AN INERT MEDIUM.

Studies on polymer blends. ii. butadiene--styrene copolymers and polybutadiene--polystyrene blends.

Abstract: The properties of butadiene–styrene copolymers and of polybutadiene–polystyrene blends were compared. Polybutadiene, polystyrene, and four copolymers having styrene contents of 20, 40, 60, and 80% were prepared. The copolymers were compared with blends having various styrene contents and prepared by means of latex blending and roll blending. Vulcanizates were prepared by three different curing methods, i.e., sulfur cure, peroxide cure, and radiation cure. The results of the benzene extraction of three vulcanizates showed that the polystyrene blended was not cured by any of the curing methods used. The properties of the vulcanizates of the copolymers were markedly different from those of the blends, i.e., in the case of the blends the properties showed a linear relationship with their blending ratio, while in the copolymers the properties showed a curvilinear relationship which had an inflection point at a styrene content of about 60%. From this phenomenon of the copolymers, it was proposed that the second-order transition point of styrene is the cause of the properties showing this peculiar point. From the results, it was found that the behavior of styrene in copolymers is essentially different from that in blends.

Olefin polymer blend with dicarboxylic acid of block copolymer of alpha-methyl styrene and aliphatic conjugated diolefin

Abstract: A COMPOSITION OF MATTER COMPRISING A BLEND OF AN OLEFIN POLYMER SUCH AS POLYETHYLENE AND A DICARBOXYLIC ACID OF A BLOCK COPOLYMER OF A-METHYLENE AND A DICARBOXYLIC ACID OF A BLOCK COPOLYMER OF A-METHYLE STYRENE AND AN ALIPHATIC CONJUGATED DIOLEFIN SUCH AS 1,3-BUTADIENE HAS THE CHARACTERISTICS OF A CROSS-LINKED POLYMER. THE COMPOSITION OF MATTER IS PREPARED BY BLENDING OR OTHERWISE MIXING THE OLEFIN POLYMER AND THE DICARBOXYLIC ACID BLOCK COPOLYMER IN RELATIVE PROPORTIONS SUCH THAT THE FINAL PRODUCT HAS AT LEAST ABOUT 0.5 PERCENT BY WEIGHT DICARBOXYLIC ACID BLOCK COPOLYMER. THE COMPOSITION OF MATTER IS USEFUL FOR PROVIDING A PROTECTIVE COATING ON A SUBSTRATE OF METAL OR THE LIKE.

Infrared Dichroic and Viscoelastic Behaviors of Polyethylene-Polypropylene Systems Blended in Molten State

Abstract: In the previous papers report was presented of simultaneous measurement that was made of the films of low and high density polyethylene and polypropylene with respect to their change in infrared dichroism and the stress and strain during stress relaxation at constant length and stretching at constant rate of strain. This new rheo-optical method was found very effective in interpreting the stress-strain curves of these materials. Because this technique enables us to determine the molecular orientation of each component in a blend subjected to deformation from the dichroic ratio of some absorption bands characteristic to each component, it can be powerful means to study the true deformation mechanism of polymer blends which have been hitherto discussed only hypothetically. In the present paper report is made of measurement that has been made by this technique of the contribution of each component in polyethylene-polypropylene blends to the total deformation and its deformation mechanisms have been discussed. At the same time, the temperature dependences of the tensile storage modules E' and loss modulus E" have been measured for the same samples.The sample blends of high density polyethylene (PE) and isotactic polypropylene (PP) having different compositions were obtained by mixing the components in the molten state. The variation of the dichroism of 998, 730, and 720cm-1 bands with elongation has been observed during the stretching at a constant rate of strain, and the change in orientation functions for crystallographic c axis of each component has been determined. The result shows that when Φp>0.7 (Φp is the weight fraction of PP in the blend), PP becomes the continuous phase or matrix and PE becomes the dispersed phase, while when Φp<0.3, PE becomes the continuous phase and PP becomes the dispersed one. It has also been observed that the dispersed phase can not be elongated so much as the continuous phase. This is much more remarkable when the phase separation occurs. With the aid of such information, the results of temperature dependences of E' and E" for the blends have been interpreted consistently.

Process for deodorising polymers of unsaturated esters

Abstract: 1,272,584. Deodorizing polymers of unsaturated esters. FISONS INDUSTRIAL CHEMICALS Ltd. 2 Oct., 1969 [5 July, 1968], No. 32330/68. Heading C3P. The odours associafed with a polymer or blend of polymers obtained wholly or in part by the homo- or co-polymerization of a carboxylic acid ester monomer, in which the alcohol and/or acid moiety contains ethylenic unsaturation, are reduced by treating the polymer or polymer blend with a hydrazine compound of the formula R 1 R 2 NNHR 3 or a hydrate thereof, R 1 , R 2 and R 3 being the same or different and representing H or alkyl, the amount of the hydrazine compound used being the equivalent of from 0A1-5% by weight of hydrazine based on the weight of polymer or polymer blend treated. The polymers may be derived from alkyl maleate, acrylate or methacrylate esters and vinyl esters such as vinyl acetate. They may be homopolymers or copolymers of two or more such esters or copolymers with other monomers such as acrylonitrile, butadrene or styrene. Examples of polymer blends are polymethyl acrylate with polybutyl acrylate; and ethylene-vinyl acetate copolymer with polyethylene. The polymer or blend is suitably treated in the form of an aqueous emulsion, dispersion or suspension.

Method for preventing electrification of synthetic high polyamides

Abstract: Synthetic high polymers, such as polyamides, polyolefins, polystyrenes, polyvinyl chloride, polyvinylidene chloride, copolymers thereof and polymer blends thereof can be prevented from electrification by incorporating homogeneously imidazole or its derivatives into said high polymers. The amount of the imidazole or a derivative thereof added is 0.005 to 20 percent by weight based on the amount of the high polymer.

Polymer blends of amino-formaldehyde prepolymers and divalent metal salts of dibasic organic acids

Abstract: METAL SALTS OF ALKANEDIOIC AND AROMATIC DIBASIC ACIDS ARE USED TO IMPROVE ONE OR MORE OF THE PHYSICAL PROPERTIES OF CERTAIN THERMOPLASTIC AND THERMOSETTING RESINS, EITHER BEFORE OR AFTER EXPOSURE TO HIGH TEMPERATURES.

Studies on polymer blends. III. Butadiene–acrylonitrile copolymer and polybutadiene–polyacrylonitrile blend

Abstract: The properties of butadiene–acrylonitrile copolymers were compared with those of polybutadiene–polyacrylonitrile blends. Also, the properties of copolymers having an acrylonitrile unit content of about 30% were compared with those of polymer blends having the same acrylonitrile unit content, i.e., NBR–NBR, polybutadiene–NBR, and polyacrylonitrile–NBR, having different acrylonitrile unit contents. These blends were prepared by roll blending and the vulcanizates were prepared by sulfur cure. The properties of the copolymers were markedly different from those of the blends, that is, in the blends the properties showed a linear relationship with their blending ratios, while in the copolymers the properties showed a curvilinear relationship. In the cases of the polymer blends having a constant acrylonitrile unit content, those blends which were prepared by blending two polymers having similar acrylonitrile unit contents showed better properties than the ones having very different acrylonitrile unit contents.

Wide‐Temperature‐Range Free‐Layer‐Damping Treatment

Abstract: The effectiveness of a specific multicomponent polymer blend as a wide temperature‐range damping material is discussed. It is shown that such a blend promises to introduce significant damping over a wider temperature range than currently used materials in a free‐layer damping treatment.

Process for the preparation of mixtures of isoprene polymers by polymerization with lithium hydrocarbyl compounds

Abstract: Mixtures of isoprene polymers are made by solution polymerizing isoprene in the presence of a lithium hydrocarbyl compound at 15-70 DEG C. to a monomer conversion of more than 50% wherein the concentration of lithium per million parts by weight of total charge is between 0.0 and 0.3 when the polymerization starts and is subsequently increased to a value between 0.10 and 1.2 as long as the monomer conversion is below 50%, and is increased further to a value between 0.20 and 6.00 when the monomer conversion is rising from 50% upwards. The polymerization is carried out using conventional low-pressure techniques. The solvent may consist of n-pentane, n-heptane, isopentanes, amylenes, cyclohexane, and mixtures thereof. The reaction is preferably terminated with methanol, and an antioxidant added such as 2,4,6-tri(3,5-di-tert.-butyl-4-hydroxybenzyl) benzene. The mixture of isoprene polymers has the following properties, an average cis-1,4 content of at least 90%, an average Hoekstra plasticity of 40-85, an average intrinsic viscosity of 4-10 dl/g., a maximum content of 10% by weight of polymers with an I.V. below 0.9 dl/g., and a particular I.V. distribution pattern. The polymer mixture can be vulcanized, e.g. with the following formulation, stearic acid, sulphur, a reaction product of ethyl-chloride, HCHO and NH3, N-oxydiethylene - 2 - benzothiazole - sulphenamide, zinc oxide, and 2,2-methylene-bis (4-methyl-6-tert.-butylphenol).

Method for drawing fibers comprised of cellulose acetate-polymer blends

Abstract: STRONG SHAPED ARTICLES CONTAINING A CELLULOSE ESTER BLENDED WITH A SYNTHETIC REINFORCEMENT POLYMER CAN BE PREPARED BY DRAWING IN AN ORGANIC FLUID SELECTIVELY ABSORBED BY SAID CELLULOSE ESTER

Studies on alkaline discoloration of acrylonitrile polymer in dimethylformamide

Abstract: Alkaline discolorations of poylacrylonitrile, acrylonitrile-methyl acrylate copolymer and polyacrylonitrile-polymethyl acrylate blend in dimethylformamide were investigated in terms of conjugated double bonds formation. Viscosity and infrared spectrum of recovered polymer were also measured.The experimental results are summarized in the followings:1) Discoloration is time dependent, but the change of viscosity occurs instantaneously. Therefore, discoloration reaction and chain degradation may be considered to be two independent processes. Residual discoloration after acidification of discolored solution is also time dependent so that at least two types of mechanisms may be presumed for the discoloration.2) Alkaline discoloration of polyacylonitrile decreases remarkably with introduction of comonomer and the behavior of discoloration is reasonably explained in terms of the sequence length of acrylonitrile which relates to the conjugated double bonds formation. The large difference in discoloration behavior between copolymeric system and polymer blend provides an useful method to investigate the microstructure of acrylonitrile polymer.3) By the application of the method, it was confirmed that the fractionation of acrylonitrilemethyl acrylate copolymer had been carried out in accordance to molecular weight, but not polymer composition.4) Viscosity of alkaline degradated polymer seems to be independent of the original molecular weight and increases with increased of comonomer content. This phenomenon is discussed from the view point of abnormal linkage between acrylonitrile units in the polymer.5) Infrared spectrum of alkaline treated polymer is compared with that of heat treated polymer.6) The effects of polymerization conversion on polymer composition was investigated in terms of alkaline discoloration for different copolymeric system. The experimental result satisfies qualitatively the calculated relationship expected from monomer reactivity ratios.