Patent · US Expired

Production of inorganic fiber products

US4650825A · kind A · utility

7Cited by

2References

11Claims

0Family size

Assignee

Rutgerswerke Aktiengesellschaft · DE

Inventors

Karl Jellinek · Iserlohn, DE
Rolf Muller · Marburg, DE
Gerhard Wisomirski · Duisburg, DE

Key dates

Filing date	May 6, 1985
Grant date	Mar 17, 1987
Priority date	—
Expiry date	May 6, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G8/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

An improved process for the production of glass and mineral fiber products bonded with a phenolic resin in which an aqueous phenol-formaldehyde resin is applied to the inorganic fiber as the bonding agent which is formed with calcium hydroxide as condensation catalyst and the mixture is thermally cured, the improvement comprising prior to processing the aqueous phenol-formaldehyde resin is adjusted to a pH of 7.5 to 11 by addition of a base and sulfate ions are added in an amount of 80 to 200% of the stoichiometric amount required for bonding the calcium ions whereby the calcium ions are converted into a water-soluble complex stable for at least three hours without any precipitation and the products produced thereby.

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