Patent · US Expired

Production of wood glue

US4021413A · kind A · utility

7Cited by

1References

4Claims

0Family size

Assignee

BASF SE

Inventors

Wolfgang Eisele
Harro Petersen · Bischofswerda, DE
Johann Mayer · Wernberg-Köblitz, DE
Otto Wittmann · Bischofswerda, DE

Key dates

Filing date	Jul 2, 1974
Grant date	May 3, 1977
Priority date	—
Expiry date	Jul 2, 1994

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G12/12
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Condensates containing urea and formaldehyde in a molar ratio of from 1:2.5 to 1:4.5 are converted into wood glue by allowing the viscosity to increase at a pH of from 1 to 3 and at only slightly elevated temperature and then adding urea at a pH of 7 to 9.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.