DOI: 10.1177/026248938800700202 ISSN:

Tailor Made Polyester Polyurethane Elastomers for Shoe Soling

J. Schwab, G.C. Bagaglio, J.M. Bentley, A. Christfreund
  • Organic Chemistry
  • Polymers and Plastics

The production of shoe soles using cellular polyurethane elastomers on an industrial scale has been in progress for almost 20 years. Now, polyurethane shoe-soling systems are used not only for house and town shoes but also for work and safety boots as well as sport and leisure shoes. With the development of dual-density technology a large number of polyurethane soling systems are offered today.

Further progress depends on improvements to processability and certain properties. This publication gives details of those in polyester-based systems.

Developments reported in this paper include:

• a new prepolymer, PBA 2224, with improved resistance to freezing

• a new range of polyester polyols with improved storage stability that remain processable for more than 6 days under machine recirculation conditions at 45°C

• a new range of polyesters that allows greater mixing ratio latitude

• special, tailor-made polyesters and prepolymers optimised for special applications such as systems with improved

– humid-ageing resistance

– flexlife at low temperatures

– light stability – particularly of white-coloured shoe-soling systems

Such developments have led to an improved robustness in processing which, the authors postulate, should lead to an increase in market demand for polyurethanes as shoe-soling materials.

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