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US 11,753,495 B2Granted
Method for producing polyurethane foam
AssigneeInoac Corporation
InventorsMasahito Koide, Yosuke Okada, Tadashi Yano
Life of this patent
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Abstract
A method for producing a polyurethane foam includes mixing and reacting a polyurethane foam raw material containing a polyol, an isocyanate, a foaming agent, and a catalyst, wherein the polyurethane foam raw material contains sodium bicarbonate and an organic solid acid such as citric acid or malic acid.
Claims7
A method for producing a polyurethane foam, comprising:
- mixing and reacting a polyurethane foam raw material containing a polyol, an isocyanate, a foaming agent, and a catalyst,
- wherein the polyurethane foam raw material further contains sodium bicarbonate and an organic solid acid,
- wherein the organic solid acid is citric acid,
- wherein an addition amount of the sodium bicarbonate is 3 to 50 times an addition amount of the citric acid in a weight ratio,
- wherein the reacting includes:
- an endothermic reaction in a first stage in which the sodium bicarbonate and the citric acid react to produce trisodium citrate, water and carbon dioxide;
- and
- an endothermic reaction in a second stage in which sodium bicarbonate not consumed in the endothermic reaction in the first stage is decomposed into sodium carbonate, water and carbon dioxide,
- wherein the addition amount of the sodium bicarbonate is 0.4 to 15 parts by weight and the addition amount of the citric acid is 0.1 to 0.8 part by weight, based on 100 parts by weight of the polyol, and
- wherein the polyol contains a polyether polyol having a hydroxyl value (OHV) of 20 mgKOH/g to 56.1 mgKOH/g.
7 more elements
A method for producing a polyurethane foam, comprising:
- mixing and reacting a polyurethane foam raw material containing a polyol, an isocyanate, a foaming agent, and a catalyst,
- wherein the polyurethane foam raw material further contains sodium bicarbonate and an organic solid acid,
- wherein the organic solid acid is malic acid,
- wherein an addition amount of the sodium bicarbonate is 2 to 50 times an addition amount of the malic acid in a weight ratio,
- wherein the reacting includes:
- an endothermic reaction in a first stage in which the sodium bicarbonate and the malic acid react to produce sodium malate, water and carbon dioxide;
- and
- an endothermic reaction in a second stage in which sodium bicarbonate not consumed in the endothermic reaction in the first stage is decomposed into sodium carbonate, water and carbon dioxide,
- wherein the polyol contains a polyether polyol having a hydroxyl value (OHV) of 20 mgKOH/g to 56.1 mgKOH/g.
6 more elements
Dependencies are inferred from the claim text.