Curable phenol-formaldehyde resin with elastic properties after curing

摘要

1. Curable phenol-formaldehyde resin having a molar ratio of phenol to formaldehyde of 1:0.6 to 1:2.5, characterised in that it contains from 3 to 60% by weight (based on phenol-formaldehyde solid resin) of bis-(3-aminopropyl)-polytetrahydrofuran of molecular weight from 500 to 3,000.