Patent ID: 6271274
Filing Date: 2001-08-07
Classification: C08G,C08J

Abstract:
A hard type polyisocyanurate foam having open-cell, useful as a supporter to fix and support a plant, said foam being prepared using a polyisocyanate compound, a hydroxy compound, a pore forming agent comprising water, pentane, hexane, dichloromethane, 1, -dichloro-1-fluoroethane, or mixture of any of the foregoing or other low boiling point liquid pore forming agent, a catalyst, a silicone foam stabilizer, a neutral emulsifier which does not have an activated hydrogen and, optionally, an ionized emulsifier, as starting materials, wherein, the polyisocyanate compound is an aromatic polyisocyanate compound, the hydroxy compound is a hydroxy compound whose average number of functional groups is bigger than 1.0 and content of oxyethylene is bigger than 20% by weight, the catalyst is at least an isocyanurate catalyst and the silicone as foam stabilizer is a polysiloxane-polyoxyalkylene copolymer whose polyoxyalkylene polyether end OH group is capped by a compound which does not include activated hydrogen atom, further, said polyoxyalkylene contains more than 30 weight % of oxyethylene, and is used at the pore formation process, further said foam having the following structural features:8 to 70 kg/m.sup.3 specific gravity;higher than 98% open-cell ratio anda 40% compressive hardness to the parallel direction to the pore forming direction in the range of 0.1 to 2.0 kgf/cm.sup.2.