Polyisocyanurate blocked

Covers both polyurethane and polyisocyanurate foam, board or block, for use from -55 to 70 C (-65 to 160 F). Application is primarily for sandwich construction. 

Similar to the previous formulation, the rheological properties are regulated with extensive use of fillers. Here, a typical combination of coarse, untreated limestone and special surface-treated calcium carbonate is used. This formulation also differs from the previous one in that it includes blocked polyisocyanurate which can react at elevated temperature after phenol blocking is removed by dissociation at elevated temperature. 

Blocked polyisocyanurate-containing plastisol. [Data from Nakata, Y Kunishiga, X, US Patent 4,983,655, Jan. 8,1991.]... 

Polyurethane has a special place here because it is used to obtain elastomeric properties required in construction and some automotive sealants. Nonyl phenol-blocked and isocyanate (or polyisocyanurate) combination is added to PVC plastisol. These sealants have relatively stable viscosity Most important properties include ... 

Chem. Descrip. Polysiloxane-polyether block copolymer Uses Foam stabilizer and emulsifier for rigid PU and polyisocyanurate foams with max. demand on flow properties esp. for refrigeration and pipe insulation Properties Cl, vise, liq, sol. in common rigid foam polyols and resin preblends dens. 1,055 0,01 g/cc vise. 750 170 mPa-s solid, pt. < -8 C hyd. no. 100 10 cloud pt. 70 3 C (4% aq.) pH 6.5 1.5 (4% aq.)... 

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