Thixotropic compositions
AssigneeBP Chemicals Limited
InventorsRobert S. Francis, Murray R. Orpin
Life of this patent
Estimating the term…
Abstract
This invention relates to a thixotropic laminating resin composition comprising an acid hardenable phenol-aldehyde resin, a highly dispersed hydrophobic amorphous silica and a viscosity modifier wherein the composition has a specified viscosity. Composites laminated with the above composition have improved dimensional stability and are resistant to combustion or smoke emission.
Claims19
A thixotropic laminating resin composition comprising:
- (a) an acid hardenable phenol-aldehyde resole,
- (b) a highly dispersed hydrophobic amorphous silica present in the composition in an amount from 0.5-5% w/w based on the total composition, and
- (c) A viscosity modifier, said composition having a viscosity of 40-50 poise at 5 rpm and of 14-18 poise at 50 rpm measured at 25.degree. C. using a Brookfield RVT instrument, spindle 4.
A thixotropic laminating resin composition capable of surface lamination of shapes, said composition comprising:
- (a) an acid hardenable phenol-aldehyde resole,
- (b) a highly dispersed hydrophobic amorphous silica present in the composition in an amount from 0.5-5% w/w based on the total composition,
- (c) a viscosity modifier, and
- (d) a filler,
- said composition having a viscosity of 80-200 poise at 50 rpm and of 300-600 poise at 5 rpm measured at 25.degree. C. using a Brookfield RVT instrument, spindle 7.
A thixotropic composition according to claim I wherein the viscosity modifier is present in the composition in an amount from 0.2-2.5% w/w.
Dependencies are inferred from the claim text.