摘要:
New catalysts for isocyanurate foams comprising alkali metal tertiaryamino dithiocarbamate salts. The novel foams are obtained by the polymerization of an excess of aromatic polyisocyanate, and a polyether or polyester polyol in the presence of a blowing agent and said alkali metal tertiaryamino dithiocarbamate salt useful as an isocyanurate group formation catalyst. The novel foams are useful in preparing rigid, flexible, semi-rigid or semi-flexible materials such as panels or slabs or sprayed foam surfaces.
摘要:
Covers a method of preparing polyether polyols useful in making a polyisocyanurate polymer by oxyalkylating an alcohol by the catalytic addition of an alkylene oxide to said alcohol in presence of a catalyst selected from the group consisting of carbamate salts, aminophenols, hexahydro-s-triazines and tetrahydrooxadiazines.
摘要:
The incorporation of a crosslinker comprising an ethylene oxide adduct of a Mannich condensate of nonyl phenol, diethanolamine and formaldehyde in molded polyurethane semiflexible foams is disclosed. Semiflexible polyurethane foams incorporating this crosslinker result in foams which offer many advantages including a significant improvement in moldability characteristics and materials utilization as well as other advantages. These improvements are demonstrable over similar formulations using other crosslinkers. The resulting foams find use in energy absorbing applications in the automotive industry and other industries.
摘要:
Covers novel urethane-modified polyisocyanurate rigid foams comprising the reaction product obtained by bringing together in the presence of a blowing agent an aromatic polyisocyanate, an isocyanurate group formation catalyst, and a polyol comprising a specific alkylene oxide adduct of aniline. The novel foams are useful in preparing rigid foam material such as panels, slabs, or sprayed foam surfaces.
摘要:
The incorporation of formic acid modified low equivalent weight amino polyols as crosslinkers in molded polyether polyurethane semiflexible foams is disclosed. These formic acid modified amino polyols result in foams which, when molded, display improved flowability, lower molded density and decreased usage per part. These improvements are demonstrable over nonformic acid modified low equivalent weight amino polyols and other commercial crosslinkers. The resulting foams find use in energy absorbing applications in the automotive industry and other industries.
摘要:
A process for polymer coating of narrow strands, for example, wires with a polymer, is disclosed whereby a rapidly reacting polymer formulation is sprayed onto the narrow strands whereupon it hardens in a very short period of time and another layer of strands is then placed atop the first which have now been coated with the polymer and a second layer of polymer formulation is sprayed on these strands, etc. The polymer formulation used comprises amine terminated polyethers of greater than 1500 average molecular weight, having greater than 50% of their average hydrogens in the form of amine hydrogens, a chain extender and an aromatic polyisocyanate.
摘要:
Covers novel urethane-modified polyisocyanurate rigid foams comprising a reaction product obtained by bringing together in the presence of a blowing agent, an aromatic polyisocyanate, an isocyanurate group formation catalyst and a polyol comprising an alkylene oxide adduct of a novolak resin containing 5-25 weight percent of free phenol or substituted phenol based on the weight of said resin. Said foams are particularly characterized by their low friability, good flammability resistance and excellent thermal stability.The novel foams are useful in preparing rigid foam materials, such as, panels, slabs or sprayed foam surfaces.