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:
Jul. 05, 1977
Filed:
Mar. 17, 1975
M Frank Gillern, Seattle, WA (US);
Weyerhaeuser Company, Tacoma, WA (US);
Abstract
Disclosed are liquid, hydrophilic, 2-stage resin compositions produced by reaction of (1) an acetone-formaldehyde resin, (2) free formaldehyde, and (3) resorcinol in an aqueous solution at elevated temperatures at least until substantially all the free formaldehyde is consumed. The molar quantities of chemically combined acetone, A, and formaldehyde, F.sub.c, in the acetone-formaldehyde resin and the molar quantities of free formaldehyde, F.sub.f, and resorcinol, R, satisfy the equations F.sub.c /A = 1.5 to 3.0, F.sub.f /R = 0.2 to 1.2 and R/A = 3.0 to 5.0. Also disclosed are adhesives prepared by combining such resin compositions with a curing agent such as formaldehyde. These adhesives cure rapidly to an insoluble infusible state in the absence of applied heat.