| 摘要 |
Polyurethane elastomers, density 0.4-1g./cc., compression set below 5% and recovery time 10-600 milliseconds, esp. contg. lightweight filler and being the reaction prod. of (A) a cpd. contg. min. 4 urethane-forming reactive sites and capable of forming stable complexes through unreacted urethane-forming sites; (B) an elasticising diol or triol; and (C) a diisocyanate in less than stoichiometric amts. Polyurethane elastomers are prepd. by (i) mixing 1 pt. cpds. (A), 1-3 pts. cpds. (B), 0.2-2 pts. filler as above and 0-0.5 pt. (D); (ii) adding (C) in wt. ratio 1:8.5-11 with total other components; (iii) forming urethane linkages on less than 80% reactive sites of (A); and (iv) stabilising the remaining reactive sites by formation of complexes such that the cured prod. has density 0.4-1 g./cc., compression set below 5 %, recovery time 10-100 millisecs. - The elastomers have rapid recovery time and are appropriate for absorbing energy applied in cycles of short duration, such as walking and running, and are used as shock absorbing elements in footwear (esp. as insoles) and in industrial applications. They are also useful in sound damping. GBAB- GB2137215 B A polyurethane elastomer composition having a density of from 0.4 to 1 gm/cc, compression set of less than about 5% and a recovery time of from 10 to 600 milliseconds. - GB2137215 B Polyurethane elastomers, density 0.4-1g./cc., compression set below 5% and recovery time 10-600 milliseconds, esp. contg. lightweight filler and being the reaction prod. of (A) a cpd. contg. min. 4 urethane-forming reactive sites and capable of forming stable complexes through unreacted urethane-forming sites; (B) an elasticising diol or triol; and (C) a diisocyanate in less than stoichiometric amts. Polyurethane elastomers are prepd. by (i) mixing 1 pt. cpds. (A), 1-3 pts. cpds. (B), 0.2-2 pts. filler as above and 0-0.5 pt. (D); (ii) adding (C) in wt. ratio 1:8.5-11 with total other components; (iii) forming urethane linkages on less than 80% reactive sites of (A); and (iv) stabilising the remaining reactive sites by formation of complexes such that the cured prod. has density 0.4-1 g./cc., compression set below 5 %, recovery time 10-100 millisecs. - The elastomers have rapid recovery time and are appropriate for absorbing energy applied in cycles of short duration, such as walking and running, and are used as shock absorbing elements in footwear (esp. as insoles) and in industrial applications. They are also useful in sound damping. (Dwg.0/0) USAB- US4476258 A New polyurethane elastomer compsn. has density 0.4-1 g/cm3, compression set less than 5% and recovery time 10-100 msec. The compsn. suitably contains light w.c. filler and is the reaction prod. of (A) urethane-forming component comprising a cpd. contg. at least four urethane-forming reactive sites capable of forming stable complexes through unreacted urethane-forming reactive sites, an elasticising diol or triol or (B) diisocyanate in less than stoichiometric amts. |
