Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1978-06-19
1980-08-19
Van Balen, William J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428149, 428325, 428331, 428404, 428921, 521122, B32B 516, B32B 1102, B32B 900
Patent
active
042185025
ABSTRACT:
Asphalt roofing material is made fire-retardant by inclusion of a layer of intumescable hydrated soluble silicate particles. Preferred soluble silicate particles carry a protective moisture-resistant coating which increases the life of the roofing material, and also makes possible convenient manufacture of the particles. The protective coating includes a metal cation capable of reacting with the silicate ion of the core particle to form a reaction product that is less soluble than the core particle. The reaction is believed to seal any openings in the protective coating, thereby lengthening the effective life of the coating. Besides utility in roofing materials, the coated particles are useful as fire-retardant additives in many other products, including polymeric articles, sheet materials, coating compositions, etc.
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Graham Joseph
Lodge, deceased James R.
Alexander Cruzan
Minnesota Mining and Manufacturing Company
Sell Donald M.
Tamte Roger R.
Van Balen William J.
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