Compositions: coating or plastic – Coating or plastic compositions – Contains fireproofing or biocidal agent
Patent
1997-04-08
1998-07-14
Green, Anthony
Compositions: coating or plastic
Coating or plastic compositions
Contains fireproofing or biocidal agent
106 1812, 106 1814, 252600, 521 50, 521 53, 521 99, 521122, 521123, 521903, 521906, C09K 2100, C08J 900
Patent
active
057797757
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a stock solution composition for use in production of hard polyurethane foam, wherein a flame-retardant filler is dispersed stably. More particularly, the present invention relates to a stock solution composition for use in production of hard polyurethane foam, which composition contains a solvent-swollen clay mineral and consequently has a high viscosity when allowed to stand and a reduced viscosity when subjected to stirring or an external pressure.
BACKGROUND ART
For production of hard polyurethane foam, a process is known which uses a polyol solution composition and trichlorofluoromethane (hereinafter referred to as CFC-11) as a foaming agent. Since flons (CFC-11 is included therein) are believed to cause the destruction of ozone layer (which leads to environmental disruption), reduction in amount of flon used or total ban of use of flon has been initiated. In that connection, dichlorotrifluoroethane (hereinafter referred to as HCFC-123) and dichlorofluoroethane (hereinafter referred to as HCFC-141b) are each being looked at as a promising candidate for substitute flon. However, even for these substitute flons, reduction in amount used or total ban of use is anticipated in a near future. Therefore, in production of hard polyurethane foam, it is drawing attention to use, as a foaming agent, CO.sub.2 which is generated in reaction of water and isocyanate.
However, when a hard polyurethane foam produced using above-mentioned CO.sub.2 is compared with a hard polyurethane foam produced using CFC-11 in a conventional process, the hard polyurethane foam produced with the CO.sub.2 has significantly inferior (low) dimensional stability, because the CO.sub.2 generated by the reaction of water and isocyanate passes through the walls of foam cells and diffuses into air and this gives rise to shrinkage of foam with the lapse of time. When, in order to avoid the above problem, the water content in the polyol solution composition is reduced, and the proportion of the foam generated is reduce to suppress the degree of shrinkage, the resulting polyurethane foam has a high density and increased weight, and has reduced flame retardancy owing to increased urethane bond amount.
Hence, it was proposed to add, to a polyol solution composition, generally a flame retardant to increase the flame retardancy of the polyurethane foam obtained and further add an inorganic or organic filler (which is a flame retardant or non-flammable substance) to increase the strength and flame retardancy of the polyurethane foam. These proposals were made in, for example, a process using a cyclic phosphagen as a flame retardant (Laid-Open) No. 85897/1978!. These processes are known even in conventional production of polyurethane foam using a flon, and use of such a technique is thought to provide a polyurethane foam having a high strength and high flame retardancy.
The flame retardant or nonflammable filler, however, has a problem. That is, although the filler can be dispersed in a polyol composition by forced stirring using a mixer or the like, the filler precipitates with the lapse of time and does not promise long term storage; therefore, the polyol composition containing the above filler must be subjected, prior to its use, to stirring or the like for dispersion of the filler, greatly reducing the work efficiency.
In order to prevent the precipitation of the flame retardant or nonflammable filler, it was proposed to add a thickener to a polyol composition containing the filler, to increase the viscosity of the Patent Application Kokai (Laid-Open) No. 252219/1992!. It is reported that use of a polyol composition having a viscosity of, for example, about 800 cp at 25.degree. C. can assure stable dispersion of about 0.5 day.
In this case, however, since the viscosity of the polyol composition is highly temperature dependent, the transfer of the composition at low temperature production of polyurethane foam becomes very difficult owing to the high viscosity of the composition (for example, the
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Imashiro Yasuo
Kuwabara Shin
Nagata Kazuhisa
Sasaki Eiji
Green Anthony
Nisshinbo Industries Inc.
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