Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1979-06-18
1981-02-17
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
138149, 138177, 428286, 428288, 428290, 428297, 428298, 428302, 428303, 428429, 428447, B32B 1500
Patent
active
042515904
ABSTRACT:
This invention relates to pipe insulation useful at relatively high temperatures, e.g., 850.degree. F. Mineral fibers bonded with phenol-formaldehyde resins and conventional anti-punking liquid resin systems have been developed as a means of producing thermal insulation of relatively low density. However, sustained punking of the binders employed caused exothermic reactions whose temperatures fused the low density mineral fibers causing thermal and structural degradation of the insulation. The present invention utilizes a relatively dense layer of fiber glass having a relatively low binder content, bonded with a binder comprising an antipunk phenolic resin and high levels of silane based on the solids content in the resin. An outer layer may surround the dense layer and be constructed with a lower density and a higher binder content.
REFERENCES:
patent: 2778759 (1957-01-01), Stephens et al.
patent: 2790464 (1957-04-01), Stephens et al.
patent: 2946371 (1960-07-01), Stephens et al.
patent: 3053715 (1962-09-01), Labino
patent: 3063887 (1962-11-01), Labino
patent: 3846225 (1974-11-01), Stalego
patent: 3956204 (1976-05-01), Higgenbottom
Modern Plastics Encyclopedia, 1968, vol. 45, No. 1A.
Loeffler, deceased Romain E.
Magill William C.
Meier Spencer I.
Rubright Kent A.
Anderson William C.
Bell James J.
Johns-Manville Corporation
Kelly Joseph J.
Krone Robert M.
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