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 

