The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1976
Filed:
Jun. 20, 1975
Harlan E Tarbell, Torrance, CA (US);
Donald W Mogg, Redondo Beach, CA (US);
David L Ruff, Torrance, CA (US);
Grefco, Inc., Bala Cynwyd, PA (US);
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.