US  10,619,000 B2  62  61  Though the polyurethane solution is not particularly  specified, in the case of storing over a long period of time,  it is preferable to store it in an inert gas atmosphere of  nitrogen, argon, or the like.  <Polyurethane Molded Article/Application>  The polyurethane and urethane prepolymer solution  thereof as produced by the present invention can reveal a  variety of characteristics and can be widely used as foams,  elastomers, coating materials, fibers, adhesives, flooring  materials, sealants, medical materials, artificial leathers, and  the like.  The polyurethane, polyurethaneurea, and urethane pre› polymer solution thereof as produced by the present inven› tion are also usable as a casting polyurethane elastomer.  Examples thereof include rolls such as rolling rolls, paper› making rolls, business appliances, pretensioning rolls, etc.;  solid tires, casters, or the like for fork lift trucks, automotive  vehicle newtrams, carriages, carriers, and the like; and  industrial products such as conveyor belt idlers, guide rolls,  pulleys, steel pipe linings, rubber screens for ore, gears,  connection rings, liners, impellers for pumps, cyclone cones,  cyclone liners, etc. In addition, the polyurethane, polyure› thaneurea, and urethane prepolymer solution thereof are  applicable to belts for OA apparatus, paper feed rolls,  squeegees, cleaning blades for copying, snowplows, toothed  belts, surf rollers, and the like.  The polyurethane and urethane prepolymer solution  thereof as produced by the present invention are also appli› cable to an application as thermoplastic elastomers. For  example, the polyurethane and the urethane prepolymer  solution can be used as tubes or hoses in pneumatic appa› ratus for use in the food and medical fields, coating appa› ratus, analytical instruments, physicochemical apparatus,  constant delivery pumps, water treatment apparatus, indus› trial robots, and the like and as spiral tubes, hoses for  firefighting, etc. In addition, the polyurethane and the ure› thane prepolymer solution are usable as belts such as round  belts, V-belts, flat belts, etc. in various transmission mecha› nisms, spinning machines, packaging apparatus, printing  machines, and the like.  In addition, examples of elastomer applications include  heel tops of footwear, shoe soles, apparatus parts such as cup  rings, packings, ball joints, bushings, gears, rolls, etc., sports  goods, leisure goods, belts of wristwatches, and the like.  Furthermore, examples of automotive parts include oil  stoppers, gear boxes, spacers, chassis parts, interior trims,  tire chain substitutes, and the like. In addition, examples  thereof include films such as key board films, automotive  films, etc., curl cords, cable sheaths, bellows, conveying  belts, flexible containers, binders, synthetic leathers, dipping  products, adhesives, and the like.  The polyurethane and urethane prepolymer solution  thereof as produced by the present invention are also appli› cable to an application as a solvent based two-pack type 55  coating material and can be applied to wood products such  as musical instruments, family Buddhist altars, furniture,  decorative plywood, sports goods, etc. In addition, the  polyurethane and urethane prepolymer solution are also  usable as a tar-epoxy-urethane for automotive vehicle repair.  60  The polyurethane and urethane prepolymer solution  thereof as produced by the present invention are usable as a  component of moisture-curable one-pack type coating mate› rials, block isocyanate type solvent coating materials, alkyd  resin coating materials, urethane-modified synthetic resin  coating materials, ultraviolet ray-curable coating materials,  and the like.  Such coating materials can be used, for example, as  coating materials for plastic bumpers, strippable paints,  coating materials for magnetic tapes, overprint varnishes for  floor tiles, flooring materials, paper, woodgrained films, and  the like, varnishes for wood, coil coatings for high process› ing, optical fiber protection coatings, solder resists, topcoats  for metal printing, base coats for vapor deposition, white  coats for food cans, and the like.  The polyurethane and urethane prepolymer solution  thereof as produced by the present invention are applicable  as an adhesive to shoes, footwear, magnetic tape binders,  decorative papers, wood, structural members, and the like.  In addition, the polyurethane and urethane prepolymer solu- tion can be used also as a component of adhesives for  low-temperature use and hot-melt adhesives.  The polyurethane and urethane prepolymer solution  thereof as produced by the present invention are usable as a  binder in applications such as magnetic recording media,  inks, castings, burned bricks, grafting materials, microcap› sules, granular fertilizers, granular agricultural chemicals,  polymer cement mortars, resin mortars, rubber chip binders,  reclaimed foams, glass fiber sizing, and the like.  The polyurethane and urethane prepolymer solution  thereof as produced by the present invention are usable as a  component of fiber processing agents for shrink proofing,  crease proofing, water repellent finishing, and the like.  The polyurethane, polyurethaneurea, and urethane pre› polymer solution thereof as produced by the present inven- tion are applicable as a sealant/caulking material to walls  formed by concrete placing, induced joints, the periphery of  sashes, wall type PC joints, ALC joints, and joints of boards  and as a sealant for composite glasses, sealant for heat› insulating sashes, sealant for automotive vehicles, and the  like.  The polyurethane produced by the present invention is  suitable for applications to polyurethanes for shoe sole,  synthetic leathers, and artificial leathers. In addition, at the  time of using the polyurethane produced by the present  invention, the polyester polyol component may have a  skeleton of adipic acid, sebacic acid, or the like. Further- more, since such a polyurethane of the present invention is  derived from plants and is biodegradable, it is further  suitable for non-durable consumer goods such as resins for  shoe.  The present invention is hereunder described in more  detail on the basis of the following Examples, but it should  not be construed that the present invention is limited to the  following Examples so far as the gist thereof is not deviated.  Next, the present invention is described in more detail by  reference to the Examples.  (Measuring Method of Molecular Weight of Polyester  Polyol)  A number average molecular weight of a polyester polyol  was determined in terms of a hydroxyl number (OH number,  mg-KOH/g).  (Measuring Method of Molecular Weight of Polyurethane)  As to the measurement of a molecular weight of the  resulting polyurethane, a GPC apparatus, manufactured by  Shimadzu Corporation (column: TSKgel Super HZM-N,  solvent: lithium bromide-added N,N-dimethylacetamide)  was used, and a weight average molecular weight as reduced  into standard polystyrene was defined as the molecular  weight.  EXAMPLES 