C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/00 (2006.01) C08G 18/65 (2006.01)
Patent
CA 2178521
A recoverable, polyurethane foam which, upon impact, will exhibit the following properties: (i) an energy absorption of at least about 85% when energyabsorption is calculated according to the following formula Image wherein I.V. is impact velocity and R.V. is rebound velocity; (ii) an efficiency of at least about 50%, wherein efficiency is defined as a percent fraction of a ratio of a square wave to the area under a curve obtained by plotting compressive force versus relative penetration depth during the impact; and (iii) for a given penetration depth, a ratio of a first compressive force at an impact velocity of 15 m.p.h. to a second compressive force at 0.004 m.p.h. of at least about 4. The polyurethane foam maybe produced by a process comprising the steps of: providing a substantially uniform mixture comprising an isocyanate, an active hydrogen-containing compound a blowing agent and a catalyst to form a reaction mixture; and expanding the reaction mixture to produce the polyurethane foam; wherein: (i) the active hydrogen-containing compound comprises from about 50 to 100 parts by weight of a first active hydrogen- containing compound having an equivalent weight of from about 200 to about 800 and from 0 to about 50 parts by weight of a second active hydrogen-containing compound; and (ii) the average equivalent weight of the active-hydrogen containing compound is in the range of from about 150 to about 700. The polyurethane foam is ideallysuited for use in applications in which energy absorption or management is desirable.
Cicone Michael J.
Kuczynski Edward T.
Gowling Lafleur Henderson Llp
Proprietect L.p.
Woodbridge Foam Corporation
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