FIELD: medicine, sport.
SUBSTANCE: invention refers to a tennis ball. The tennis ball contains elastomeric foamed polyurethane ball-shaped and characterised by density equal to 250-800 kg/m3. Foam is coated with a textile material, and a compound produced by a reaction of aromatic polyisocyanate and polyol contains at least 60 wt % of polyol, exhibits an unsaturation level equal to 0.03 mekv/g and less, and with a pore-forming material applied.
EFFECT: prolonged service life.
8 cl, 1 tbl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| NEW TENNIS BALL | 2008 |
|
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| ELASTOMERIC MATERIALS WITH HIGH CONTENT OF HARD UNITS AND METHOD FOR PRODUCTION THEREOF | 2009 |
|
RU2483084C2 |
| PREPOLYMER, POLYOL COMPOSITION AND METHOD FOR PREPARING ELASTIC FOAM MATERIAL | 2003 |
|
RU2320676C2 |
