Foamed polyurethane-forming composition, foamed polyurethane and process making the same
First Claim
1. A process for producing rigid formed polyurethanes suitable for model materials, which comprises dispersing an inert gas with mechanical stirring into a formed polyurethane-forming composition, containing substantially no blowing agent, comprising:
- (1) an organic polyisocyanate component,(2) a polyol component comprising about 5-50% by weight of a high molecular weight polyol (A1) having a hydroxyl number less than about 300 and about 50-95% by weight of a low molecular weight polyol selected from the group consisting of polyhydric alcohols containing 3-8 hydroxyl groups and alkylene oxide adducts of said polyhydric alcohols (A2) having a hydroxyl number of at least 300, and(3) at least 1 part by weight, per 100 parts by weight of the polyol component, of molecular sieves having 3 Angstrom pores of the zeolite type.
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Accused Products
Abstract
Foamed polyurethanes substantially free from non-uniform density distribution are obtained by dispersing an inert gas with mechanical stirring into a foamed polyurethane-forming composition containing substantially no blowing agent and comprising (1) an organic polyisocyanate component, (2) a polyol component comprising a high molecular weight polyol (A1) and a low molecular weight polyol (A2), (3) a dehydrating agent (B) and optionally organic microballoons, and curing the resulting composition containing therein the inert gas substantially homogeneously distributed. Foamed polyurethanes thus obtained are lightweight and of reduced warpage after processing and are suitable for model materials.
45 Citations
30 Claims
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1. A process for producing rigid formed polyurethanes suitable for model materials, which comprises dispersing an inert gas with mechanical stirring into a formed polyurethane-forming composition, containing substantially no blowing agent, comprising:
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(1) an organic polyisocyanate component, (2) a polyol component comprising about 5-50% by weight of a high molecular weight polyol (A1) having a hydroxyl number less than about 300 and about 50-95% by weight of a low molecular weight polyol selected from the group consisting of polyhydric alcohols containing 3-8 hydroxyl groups and alkylene oxide adducts of said polyhydric alcohols (A2) having a hydroxyl number of at least 300, and (3) at least 1 part by weight, per 100 parts by weight of the polyol component, of molecular sieves having 3 Angstrom pores of the zeolite type. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A process for producing rigid formed polyurethanes suitable for model materials, which comprises dispersing an inert gas with mechanical stirring into a foamed polyurethane-forming composition, containing substantially no blowing agent, comprising:
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(1) an organic polyisocyanate component, (2) a polyol component comprising about 5-50% by weight of a high molecular weight polyol (A1) having a hydroxyl number less than about 300 and about 50-95% by weight of a low molecular weight polyol selected from the group consisting of polyhydric alcohols containing 3-8 hydroxyl groups and alkylene oxide adducts of said polyhydric alcohols (A2) having a hydroxyl number of at least 300, and (3) at least 1 part by weight, per 100 parts by weight of the polyol component, of a neutral or basic compound selected from the group consisting of hydroxides, oxides and salts of metals falling within the groups II, III and IV of the periodic table;
or a mixture, double salt or complex containing these compounds. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification