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1. (WO2013160450) PROCESS FOR THE PRODUCTION OF A PHENOL-FORMALDEHYDE RESIN HAVING LOW FREE-FORMALDEHYDE CONTENT, THE PHENOL-FORMALDEHYDE RESIN RESULTING FROM THIS PROCESS, AND ITS USE AS A BINDER FOR MINERAL WOOL INSULATION PRODUCTS

Pub. No.:    WO/2013/160450    International Application No.:    PCT/EP2013/058728
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Sat Apr 27 01:59:59 CEST 2013
IPC: C03C 25/34
E04B 1/74
C08G 8/10
C08L 61/06
Applicants: URSA INSULATION S.A.
Inventors: CASTRO-CABADO, Maria Mercedes
SANCHEZ PERUCHA, Alejandro
AZNAR ÉCIJA, Ana Isabel
CASADO DOMINGUEZ, Arturo Luis
Title: PROCESS FOR THE PRODUCTION OF A PHENOL-FORMALDEHYDE RESIN HAVING LOW FREE-FORMALDEHYDE CONTENT, THE PHENOL-FORMALDEHYDE RESIN RESULTING FROM THIS PROCESS, AND ITS USE AS A BINDER FOR MINERAL WOOL INSULATION PRODUCTS
Abstract:
The present invention relates to a method of reducing the content of free formaldehyde in phenol-formaldehyde resins, wherein this method comprises the step of treating the phenol-formaldehyde resin starting material with at least one oxidizing agent. The present invention further relates to the phenol-formaldehyde resin resulting from this process and its use as a binder in the manufacture of mineral wool insulation products of low formaldehyde emissions. The resulting phenol-formaldehyde resin has a free formaldehyde content of lower than 0.5 weight % determined according to ISO 11402; the pH is in the range of 7 to 10, the dilutability is more than 20 times in demineralized water at 20°C, the viscosity is below 100 mPa.s at 20°C, and the phenol-formaldehyde condensates, contained in the resin, consist of phenol and formaldehyde.