Coating for porous surfaces

Details Coating for porous surfaces Coating for porous surfaces

1975-06-20

1976-08-31

Pitlick, Harris A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

428315, 428320, 428425, 428524, B32B 326, B32B 518, B32B 2300

Patent

active

039782646

ABSTRACT:
When a porous substrate such as perlite insulation board is surfaced with a foamed polymer layer formed in place from liquid components, the liquid components will often partially penetrate the surface, resulting in loss of materials and uneven foaming. A barrier coating which can prevent penetration is provided by applying to the porous substrate an aqueous mix of a thermosetting resin which cures through methylol groups, such as urea formaldehyde, with a component containing a hydroxyl group, such as starch, cereal flour, or the like. When the barrier coating is dried, a water insoluble cross-linked surface is formed which is impenetrable to foam constituents. A greater foam thickness is obtained for a given amount of foamable material and a more uniform thickness also results.

REFERENCES:
patent: 2487060 (1949-11-01), Pike et al.
patent: 3510391 (1970-05-01), Bolster et al.
patent: 3533901 (1970-10-01), Sutker

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