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    • 92. 发明授权
    • Use of liquid carbon dioxide as a blowing agent in the production of
open-cell polyurethane foam
    • 液体二氧化碳作为开孔剂在生产开孔聚氨酯泡沫中的应用
    • US5120770A
    • 1992-06-09
    • US442645
    • 1989-11-29
    • Earl N. DoyleScott Carson
    • Earl N. DoyleScott Carson
    • C08J9/12C08J9/14
    • C08J9/127C08J9/122C08J9/14C08J2203/14C08J2203/142C08J2205/05C08J2375/04
    • A process for the production of an open cell polyurethane foam comprises the mixing of the following components at ambient temperatures in a mixing zone: a diisocyanate having a functionality of at least about 2.0, at least one hydrogen donor, at least one surfactant which is effective in forming an open cell polyurethane foam, at least one catalyst, and a blowing agent comprising a gas having a boiling point below approximately -100.degree. F. at atmospheric pressure which preferably comprises carbon dioxide. In addition, the mixture may also optionally contain water. The mixture is subjected to a pressure in said mixing zone which is sufficient to maintain the blowing agent in the liquid state at ambient temperatures. After mixing, the mixture is ejected from the mixing zone to atmospheric pressure, thereby completely and instantaneously vaporizing the blowing agent to provide expansion of the mixture. The resultant foam is then cured at ambient temperatures.
    • 用于生产开孔聚氨酯泡沫的方法包括在混合区中在环境温度下混合以下组分:具有至少约2.0的官能度的二异氰酸酯,至少一种氢供体,至少一种有效的表面活性剂 在形成开孔聚氨酯泡沫,至少一种催化剂和包含沸点低于约-100°F的气体的发泡剂中,其优选包含二氧化碳。 此外,混合物还可以任选地含有水。 混合物在所述混合区中受到压力,其足以使发泡剂在环境温度下处于液态。 混合后,将混合物从混合区喷射至大气压,从而完全和瞬间气化发泡剂以提供混合物的膨胀。 然后将所得泡沫在环境温度下固化。
    • 94. 发明授权
    • Foam rigidizing process and products produced therewith
    • US4548861A
    • 1985-10-22
    • US537728
    • 1983-09-29
    • John M. BarnesRobert G. HaleyGeorge E. Trepus, Jr.
    • John M. BarnesRobert G. HaleyGeorge E. Trepus, Jr.
    • B29C44/56C08J9/42C08G18/14B32B3/26B32B5/18
    • B29C44/5618C08J9/42C08J2205/05C08J2475/00Y10T428/24996Y10T428/249986Y10T428/249994Y10T428/249999
    • A composite, rigid, structural, foam panel (11) comprising: (i) a flexible, non-structural, open cell reticulated or semi-reticulated, foam sheet (10); and (ii), an essentially closed cell resinous foam formed from a flowable, foamable material (12); and, wherein the open cell non-structural foam sheet (10) and the essentially closed cell foam are each coextensive with the volume of spaced defined by the panel (11). In a preferred embodiment of the invention, the flexible, non-structural, open cell reticulated or semi-reticulated foam sheet (10) comprises an electromagnetic wave absorber and, consequently, the essentially closed cell rigid structural panel (11) produced comprises a rigid, structural electromagnetic wave absorber. The rigid panels and/or absorbers (11) of the present invention are preferably formed of urethane-like materials and in a process embodying the invention wherein: a flowable, foamable, resinous material (12) composed of Components "A" and "B" and a suitable cream are proportioned to form a panel (11) of the desired shape; the Components are thoroughly stirred, and introduced into the bottom of a preheated, vented mold (15) having suitable vents (19); the open cell flexible foam sheet (10), precut to the desired size, is inserted into the mold (15) on top of the flowable, foamable, resinous material (12); the lid (18) of the mold (15) is closed and clamped in place; and, the reactive Components "A" and "B" are allowed to foam and expand in an exothermic reaction, whereby the expanding material (12) is forced into, entirely through, and entirely throughout the open cell foam sheet (10) with excess material (12) escaping from the mold (15) through the vents (19). After curing at room temperature for at least two hours, the panel (11) is demolded and trimmed as required.