Showing papers on "Thermoplastic polyurethane published in 1988"

Compatible blends of polyolefins with thermoplastic polyurethanes

Abstract: Disclosed are novel thermoplastic compatible compositions comprising a polyolefin, a thermoplastic polyurethane, and a compatibilizing amount of at least one modified polyolefin. The polymer blends are soft, flexible, resinous compositions of high tensile and tear strengths. The compositions overcome the barrier of incompatibility between polyethylene and thermoplastic polyurethanes.

A study on the reactive extrusion process of polyurethane

Abstract: An engineering analysis of the reactive extrusion process of a thermoplastic polyurethane was made through numerical simulation and actual experiment. The reactants used in this system were 4,4′diphenylmethane diisocyanate, polycaprolactone diol (M.W., 824), and 1,4-bu-tanediol with equivalent weight ratio of 2:1:1. As a catalyst, dibutyltin dilaurate was used. The reaction kinetics and the viscosity function were obtained through experiments, and the mathematical model which includes the conservation equations of mass, momentum, energy, and chemical species was solved numerically to obtain the velocity, concentration, temperature, viscosity, and pressure profiles. The actual experiments were performed in the laboratory scale extruder to compare the experimental results with those of the numerical simulation.

Use of a thermoplastic polyurethane for the preparation of a blown film

Abstract: Soft linear thermoplastic polyurethanes, which have low permanent set, high tear propagation resistance, and low blocking, and which are extrud­able by blown film techniques, are prepared by reacting one mole of a hydroxyl terminated poly­ester having a molecular weight from about 1800 to about 3600, from about 0.5 to about 2.0 moles of an aromatic glycol chain extender, and an organic diioscyanate in molar quantities substantially equal to the sum of the molar quantities of poly­ester and chain extender. The polyester is a mixed polyester prepared by reacting at least two dif­ferent alaphatic glycols with one or more organic dicarboxcylic acids or at least one aliphatic glycol with two or more organic dicarboxcylic acids. The aliphatic glycol may have from 2 to about 10 carbon atoms. The organic dicarboxcylic acid may be either aliphatic or aromatic and may have from 2 to about 12 carbon atoms. The pre­ferred chain extender is hydroquinone bis(beta-hydroxyethyl)ether. Polymers of this invention are useful as elastic tapes, and in particular as leg bands in diapers and adult incon­tinence garments. They may be used for other items of form-fitting apparel, such as ladies swim suits.

Urethane rubber adhesive for polyolefin

Abstract: PURPOSE: To provide the subject adhesive produced by compounding a thermoplastic polyester urethane rubber and a hydroxyl-terminated polybutadiene glycol with a specific comb-type polymer, having improved compatibility between both components and capable of imparting an adhered with excellent adhesivity to a material containing a polyolefin. CONSTITUTION: The objective adhesive is produced by compounding (A) 100 pts.wt. of a thermoplastic polyurethane rubber with (B) 3-60 pts.wt. of a hydrogenated hydroxyl-terminated polybutadiene glycol (e.g. a compound having 1,2-vinyl structure or a 1,4-trans structure), (C) 15-30 pts.wt. of a solubilizing agent consisting of a comb-type polymer (e.g. a polymer having the structure of formula) having a main chain consisting of a polyethylene skeleton and a side chain formed by adding a monoisocyanate compound (e.g. phenyl isocyanate) to terminal OH group or COOH group of an ester bond between COOH group and OH group and (D) an organic solvent (e.g. ethyl acetate) of an amount to give a solution having a concentration of 5-30wt.%. COPYRIGHT: (C)1990,JPO&Japio

Low modulus interlayer

Abstract: A low shear modulus thermoplastic polyurethane useful in laminating rigid plies with different coefficients of thermal expansion without warpage is disclosed, along with laminates comprising said low modulus interlayer.

Multi-layer polyurethane film and laminated sheet thereof

Abstract: PURPOSE: To contrive the elevation of mechanical strength and the improvement of resistances to heat, water, moisture, fungus and the like, by a method wherein the degree of orientation, obtained from the Young's modulus of a multi-layer film consisting of the lamination of ether thermoplastic polyurethane resin films, is specified. CONSTITUTION: A multi-layer polyurethane film 1 is produced by laminating ether polyurethane resin layers 3 on one side or both sides of a layer 2 consisting of the ester polyurethane resin. The thickness of the ester polyurethane resin film layer 2 occupies preferably 30W95% or 40W80% preferably when various properties such as resistance to water, moisture, fungus and the like of the multi-layer film and the economic property of the same are considered. The degree of orientation, obtained from the Young's modulus of the multi-layer film, should be 10W70% or preferably 20W60%. When the degree of orientation of the film is low and the strength of the same is insufficient, the thickness of the film should be thicker than a necessary thickness and, therefore, a trouble such that flexibility property and moisture permeating property which are proper to the polyurethane film are spoiled remarkably may be generated. COPYRIGHT: (C)1989,JPO&Japio

Impact-resistant polymer moulding compositions, process for their preparation and their use

Abstract: The invention relates to impact-resistant polymer moulding compositions based on (A) polyoxymethylenes, (B) thermoplastic polyurethanes and (C) polyalkylene terephthalates and optionally (D) additives, which expediently comprise from 95 to 40 parts by weight of at least one polyoxymethylene homopolymer and/or copolymer (A), from 5 to 60 parts by weight of a mixture of from 60 to 98% by weight of at least one thermoplastic polyurethane (B) and from 2 to 40% by weight of at least one polyalkylene terephthalate (C), where the percentages by weight are based on the total weight of (B) and (C) and the parts by weight of (A) + (B) + (C) add up to 100 parts by weight and from 0 to 60 parts by weight of an additive (D), to a process for their preparation and to their use. In order to prepare the polymer moulding compositions, by the preferred method, components (A) to (C) and, if used, (D) are introduced individually or as mixtures, into an extruder and melted together at temperatures in the range from 150 to 260@C. The polymer moulding compositions are suitable for the production of films, sheeting or mouldings which are used, for example, in the vehicle, electrical appliance and electrical industries.

Transparent sheet for dot impact recording

Abstract: PURPOSE:To obtain a sheet which makes it possible to directly form a manuscript by dot impact printing and to project sharp images on a screen by an OHP, by providing on the surface of a transparent base a coated film of a thermoplastic polyurethane having a thickness of at least 2 mum and comprising porous silica having an average particle diameter of not more than 5 mum, as required, while maintaining a ray transmittance of at least 60%. CONSTITUTION:A coated film of thermoplastic polyurethane at least 2 mum in thickness is provided on the surface of a transparent base. Since the coated film has an ink absorptivity suitable for dot impact recording inks, printing with favorable penetration and drying of the inks can be performed. Further, porous silica having an average particle diameter of notmore than 5 mum can be incorporated in the coated film, as required, whereby sharpness of printed images can be enhanced. The amount of porous silica incorporated into the coated film and the thickness of the film are suitably selected to maintain a ray transmittance of at least 60%. With a sheet thus obtained, sharp images can be projected on a screen by an OHP.

Production of thermoplastic polyurethane elastic nonwoven fabric

Abstract: PURPOSE: To obtain the subject nonwoven fabric excellent in flexibility, stretchability, appearance and touch with good roll unwinding properties using a melt blowing method, containing a fatty acid ester or amide-base compound in a specific proportion in a thermoplastic polyurethane CONSTITUTION: The objective nonwoven fabric obtained by blending (A) a thermoplastic polyurethane with (B) 01-20wt% compound consisting of a compound expressed by the formula (C n H 2n+1 ) m X (n is 15-35; m is 1-3; X is ≤5C fatty acid ester, ≤5C fatty acid amide or ≤5C fatty acid ester containing a Ca salt) (eg, stearamide), then melt extruding the resultant blend and using a melt blowing method Thereby, gluing between nonwoven fabrics caused due to tackiness by rubber-like properties unique to the thermoplastic polyurethane and chemical bonding of reactive isocyanates is eliminated COPYRIGHT: (C)1989,JPO&Japio

Process for preparing moulding compositions having an enhanced cold impact resistance, based upon polyoxymethylenes and thermoplastic polyurethanes

Abstract: Moulding compsns. with better cold impact strength are prepd. by mixing (A) polyoxymethylene (co)polymers, at increased temp., with (i) at least 1 component for polyurethane synthesis, and reacting the mixt. with the other components for synthesis of a thermoplastic polyurethane (B), or (ii) with the flowable reaction mixt. for prepn. of the thermoplastic polyurethane, and allowing the mixt. to react. (A) The polyoxymethylene (co)polymer pref. has mol. wt. 2,000-100,000 and MFI 0.5-200 at 190 deg. C, 21.17 N, and is used as a melt. It is mixed at 170-260 deg. C with (i) or (ii), pref. in an extruder. (B) The polyurethane elastomer is prepd. from (a) an aromatic diisocyanate, pref. 4,4'-diphenylmethane diisocyanate. (b) linear poly-hydroxy cpds., pref. alkylene glycol adipate(s) with 2-6C in the glycol gp. and mol. wt. 800-3500, or polyoxytetramethylene glycol(s) with mol. wt. 800-3500, and (c) butane 1,4-diol. The compsn. contains (A) and (B) in ratio by wt. of 95:5-40:60.

Heat-shrinkable polyurethane film

Abstract: PURPOSE:To realize flexibility, large tensile and tear strength and resistance having excellent external force such as piercing, a shock, etc., by giving specific heat shrinkage rate and elongation set to a film composed of a thermoplastic polyurethane resin having the specific heat of crystal fusion. CONSTITUTION:A thermoplastic polyurethane resin consists of one kind or two kinds or more of a thermoplastic polyurethane resin such as an adipate ester group, a polyether group, a caprolactone ester group, a polycarbonate ester group, etc., and the heat of crystal fusion thereof is brought to 0.1-3.0cal/g, preferably 0.5-2.0cal/g. In a heat-shrinkable polyurethane film, a heat shrinkage rate in a glycerin bath at 120 deg.C must be brought to 20% or more, preferably 30% or more in at least either one of the longitudinal and cross directions and an elongation set to 30% or less, preferably 20% or less.

Thermoplastic polyurethane resin composition

Abstract: PURPOSE:To obtain a thermoplastic polyurethane resin composition which is excellent in durability, abrasion resistance and storage stability in a solution at low temperatures and suitable especially as a binder for a magnetic recording medium, by reacting a chain-lengthening agent consisting of an aliphatic polyester diol and an alicyclic diol with an organic diisocyanate. CONSTITUTION:This thermoplastic polyurethane resin composition is formed of an aliphatic polyester diol obtained from an aliphatic acid and an aliphatic diol or from said diol and lactone, a chain-lengthening agent consisting of an alicyclic diol, and a polyurethane resin obtained from an organic diisocyanate. This polyurethane resin contains 2-15wt% alicyclic component and 10-55wt% organic diisocyanate and has a molecular weight of 30,000-200,000.

Production of molding of crosslinked thermoplastic urethane composition

Abstract: PURPOSE:To obtain the title molding having excellent water resistance, by mixing a thermoplastic polyurethane resin with a specified antioxidant, carbon black and a polyfunctional monomer, molding the resulting compsn. and irradiating the molded product with an ionizing radiation to crosslink it. CONSTITUTION:A molding of a thermoplastic polyurethane compsn. obtd. by mixing 100pts.wt. thermoplastic polyurethane resin with 0.5-10pts.wt. antioxidant having 3,5-di-tert-butyl-4-hydroxyphenyl groups [e.g., N,N'-hexamethylene bis(3,5-di-t-butyl-4-hydroxy-hydrocinnamide)], 0.1-10pts.wt. carbon black and 1-20pts.wt. polyfunctional monomer {e.g., a compd. of the formula [wherein m is 3-4, n is 1-0 and m+n=4; and R is a (hydroxy)alkyl] is irradiated with an ionizing radiation at a dose of 1-30 Mrad to crosslink it. The title compsn. having excellent water resistance can be obtd.

Polyurethane multi-layers tube for bicycle

Abstract: PURPOSE: To improve the economical efficiency, durability and the like of the tube in the title by laminating a polyether series polyurethane resin layer on at least outer surface of an adipateester series polyurethane resin layer with a specific rate of thickness and forming multi-layers tube with a specific harness. CONSTITUTION: In a tube for bicycle whose main constituent is thermoplastic polyurethane resin, the tube for bicycle is formed by the multi-layers tube with JIS hardness 50-90Hs in which polyether series polyurethane resin is laminated on at least outer surface of an adipateester series polyurethane resin layer. The thickness of the adipateester series polyurethane resin layer is set by 30-95% against the entire thickness of the multi-layers tube. Thereby, economical efficiency, water resistance, mould resistance, air holdability and so on are further given to the multi-layers tube in addition to excellent softness, elasticity, wear resistance, rim hit resistance and so on peculier to polyurethane resin. COPYRIGHT: (C)1990,JPO&Japio

Fatigue strength at subzero temperature of films made of polymer mixtures based on thermoplastic polyurethane

Abstract: The investigations show that the flexing resistance of the films of thermoplastic polyurethane at the subzero temperatures can be increased several times by mixing polyurethane with rubber with a low glass transition temperature. As a result of the heterogeneity of the structure in the mixtures containing the optimum or almost optimum amount of rubber, cyclic bending is accompanied by the formation of a large number of microdefects but the conditions for formation of a macrocrack are less favorable, whilst in pure polyurethane the main crack can form and propagate in the presence of far less extensive volume damage. The design of the small-angle light diffractometer proposed in this work can be used successfully for examining fatigue damage in nonuniformly loaded specimens. The quality of the resultant mixtures can be inspected by measuring the integral optical properties or light scattering indicatrices.

Radiation-resistant composition

Abstract: PURPOSE:To obtain the title composition which is improved in radiation resistance, flame retardancy and blooming resistance without lowering its good mechanical properties and flexibility, by mixing a thermoplastic polyurethane with a brominated epoxidized oligomer, Sb2O3 and an ultraviolet absorber in a specified mixing ratio. CONSTITUTION:100 pts.wt. thermoplastic polyurethane of a polyether, polycarbonate, caprolactone ester or the like type is mixed with 10-75 pts.wt. brominated epoxidized oligomer [e.g., a compound of the formula (wherein R and R' are each a 1-7C hydrocarbon group, and n is a positive integer)], 5-50 pts.wt. Sb2O3 and 1-20 pts.wt. ultraviolet absorber such as a benzotriazole or benzophenone compound as a radiation-shielding agent.

Flame-retardant polyurethane elastomer resin composition

Abstract: PURPOSE:To provide the title compsn having excellent moldability and flame retardance, by blending a thermoplastic polyurethane elastomer with a specified compd having an epoxy group and a halogen-contg flame retarder CONSTITUTION:100ptswt mixture of 100ptswt thermoplastic polyurethane elastomer (A) obtd by reacting a bifunctional polyol with a diisocyanate and 5-20ptswt halogen-contg flame retarder (B) [eg, tris(Z-chloroethyl)phosphate] is blended with 02-20ptswt, pref 1-15ptswt compd (C) having one epoxy group which is not positioned at its molecular terminal (eg, epoxidized soybean oil) and optionally, 1-15ptswt alkylaryl phosphate (D) If desired, a blowing agent, an antioxidant, an antifungal agent, a colorant, etc, are added thereto

Process for preparation of a thermoplastic polyurethane resin

Abstract: A thermoplastic polyurethane resin is prepared by the reaction of (A) p-phenylene diisocyanate, (B) a hydroxyl terminated poly(hexamethylene carbonate) polyol having a molecular weight of 850 to 5000 and (C) a short chain polyol having 2 to 10 carbon atoms as the chain extending agent, the molar ratio of (B) : (C) being 1 : 2 to 1 : 0.05, and the molar ratio of isocyanate groups : total active hydrogen groups being 0.93 : 1 to 1.20 : 1.

Elastic abrasion-resistant laminated material

Abstract: An elastic laminate which includes a first elastic sheet having at least one other elastic sheet joined thereto The first elastic sheet is formed from an ethylene vinyl acetate copolymer The second elastic sheet is formed from a thermoplastic polyurethane elastomer The sheets may be nonwoven webs of meltblown fibers

Tube having excellent air holding capability for motorcycle

Abstract: PURPOSE:To reduce weight and to improve performance, by a method wherein a thermoplastic polyurethane elastomer and synthetic resin having gas cutoff properties higher than that of the elastomer are blended in a given ratio, and a tube is formed by resin having specified permanent elongation and 100% modulus stress. CONSTITUTION:A tube is formed by using resin prepared by blending 50-99wt% thermoplastic polyurethane elastomer and 1-50wt% synthetic resin, e.g. polyvinyl chloride, having gas cutoff properties higher than that of the thermoplastic polyurethane elastomer and having permanent elongation of 40% or more and modulus stress of 150kg/cm or less, both specified in JIS K6301. This constitution reduces the weight of a tube, improves processing characteristics, and enables improvement of performances, e.g. running stability, durability, air holding ability.

Powder-filled elastomer composite material

Abstract: PURPOSE:To obtain the titled composite composition having excellent friction and abrasion characteristics and sliding characteristics free from damage of contacting material in sliding motion and exhibiting the characteristics especially under condition of high pressure and high speed operation, by compounding a thermoplastic elastomer with powdery titanium and powdery silicon nitride. CONSTITUTION:About 20-95pts.wt. of a thermoplastic elastomer or a polyurethane elastomer free from thermoplastic nature is compounded with about 40-2.5pts.wt. of powdery titanium and about 40-2.5pts.wt. of powdery silicon nitride. The thermoplastic elastomer is selected from thermoplastic polyurethane, polyester elastomer and polyolefin elastomer. The composite material may be a compound produced by reacting a polyol component with a diisocyanate component in the presence of powdery titanium and silicon nitride.

Carbon fiber cord

Abstract: PURPOSE:To provide a carbon fiber cord having a specific strength contribution degree and giving belts having high strengths and low elongations by coating carbon fibers with a thermoplastic polyurethane resin. CONSTITUTION:A carbon fiber strand (preferably comprising acrylic based carbon fibers containing >=93wt.% of carbon and 1-7wt.% of nitrogen) having a single fiber number of 1000-15000 and having 50-800 tex is subjected to a fiber surface-oxidation process, dried and subsequently twisted (preferably at the first twisting number of 30-150 turns/m). Two or more of the first twisted carbon fiber strands are doubled, subjected to the reverse twist process (preferably at the second twisting number of 30-150 turns/m) and subsequently coated with a thermoplastic polyurethane resin to provide a carbon fiber cord having a strength distribution coefficient T of >=55% represented by the formula [a is a strength (kg) of the carbon fiber cord measured according to JIS-R 7601 after the resin is removed; and b is a strength (kg) of the carbon fiber cord] and further having a diameter of 1.35mm and a strength of >=200kg.

Manufacture of polyurethane film

Abstract: PURPOSE:To integrate urethanating reaction with film forming process by a method wherein polyol component and polyisocyanate compound, both of which are the raw material components of polyurethane, are polymerized by being passed through a twin-screw extruder and, after that, formed into a film by being passed through a die. CONSTITUTION:Polyol component 1 and polyisocyanate compound 2, both of which are the raw material of polyurethane, are mixed with each other and agitated and the resultant mixture is poured in a twin-screw extruder 4 so as to be polymerized. After that, the polymerized mixture is sent through or without a constant delivery pump 5 so as to pass through a die 6 mounted on the twin-screw extruder 4 in order to be formed into a film. Since the polymerization from the raw materials of polyurethane and film-forming are simultaneously effected instead of the film-forming through the melt extrusion of thermoplastic polyurethane, the simplification of production process and the formation of thermosetting-type polyurethane film becomes possible.

Features of polyvinyl chloride dehydrochlorination kinetics in ternary blends with acrylonitrile-butadiene-styrene copolymer and polyurethane in a closed system

Abstract: Critical phenomena during the dehydrochlorination of PVC in a blend with acrylonitrile-butadiene-styrene copolymer and thermoplastic polyurethane in a closed system are studied. The solubility of HCl in the polymer film is evaluated as a function of the degradation temperature.

Colored glass fiber structure and production of colored glass fiber-reinforced thermoplastic resin sheet

Abstract: PURPOSE: To make it possible to facilitate simultaneously the adhesion of a resin to a glass fiber structure and its coloration by immersing a glass fiber in a thermoplastic resin varnish containing a dye previously dissolved or dispersed therein. CONSTITUTION: A dye is dissolved or dispersed in a varnish of a thermoplastic resin such as a polyamide, a polyester or a thermoplastic polyurethane. A glass fiber structure is immersed in this varnish and dried to obtain a colored glass fiber structure. It is also possible to obtain a colored glass fiber-reinforced thermoplastic resin sheet by hot-pressing the above structure with a thermoplastic resin sheet such as a urethane sheet or a nylon sheet. COPYRIGHT: (C)1989,JPO&Japio

Non-rigid polyvinyl chloride resin composition

Abstract: PURPOSE:To form a non-rigid polyvinyl chloride resin compsn. having excellent processability, migration resistance, cold resistance, non-tackiness, etc., by blending polyvinyl chloride with thermoplastic polyurethane and a specified modified vinyl ester/ethylene resin. CONSTITUTION:The title compsn. is formed from 100pts.wt. polymer compsn. consisting of polyvinyl chloride (A) and thermoplastic polyurethane (B), and 5-50pts.wt. modified vinyl ester/ethylene resin (C) having a solubility coefficient of 8.5-15 obtd. by polymerizing 5-50pts.wt. polar vinyl monomer having a solubility coefficient of 8.5-15 in the presence of 100pts.wt. vinyl ester/ethylene copolymer. As the component C, those having a melt viscosity of 10 -10 P at 170 deg.C are preferred.

Thermoplastic polyurethane resin composition

Abstract: PURPOSE: To obtain the subject composition with improved hardness, strength and stiffness without damage of the essential characteristics by mixing a specified potassium titanate fiber. CONSTITUTION: With a thermoplastic polyurethane resin a potassium titanate fiber with ≥10 aspect ratio is blended in an amount of 5-60-wt.%, preferably 10-50 wt.% of the total weight. As the potassium titanate fiber, potassium titanate [K 2 O.(TiO 2 ) 6 ] fiber with 6.0-8.5pH and ≤0.10 half-value width of the characteristic peak at 2θ=13.8° in the x ray diffraction chart is used. COPYRIGHT: (C)1990,JPO&Japio