Compound of intumescent powder and thermoplastic material
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United States of America Patent
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Sep 14, 2004
Grant Date -
Jun 5, 2003
app pub date -
Jul 5, 2002
filing date -
Nov 30, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A compound is provided having the means of intumescence at temperatures above 195.degree. C. to 220.degree. C. The compound is an intumescent powder defined by the molar ratios (2.20 to 3.70) SiO.sub.2 /(0.20 to 0.35) Li.sub.2 O: (0.65 to 0.80)(Na.sub.2 O+K.sub.2 O) where the coefficients of Li.sub.2 O and of (Na.sub.2 O+K.sub.2 O) total 1.00 and thermoplastic material having a plastic state at less than 195.degree. C. If the thermoplastic contains a halogen, as does Polyvinyl Chloride (PVC) the halogen acts as a flame retardant in the event of combustion and prevents complete burning of the plastic. If there is as filler mixed with the compound which is endothermic this assists with the fire retardant effect of the compound.
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