Abstract:
PROBLEM TO BE SOLVED: To provide an emulsion containing a halogen-free foaming agent for producing rigid foam based on isocyanate groups that brings about the properties improved by processing (in other words, improved heat stability and/or good foaming of the reaction mixture). SOLUTION: This emulsion contains (a) a compound bearing hydrogen atoms reactive to isocyanate, (b) water, (c) a halogen-free foaming agent having physical activity, and, when necessary (d) auxiliary agents and/or usually used additives. In this case, the components (a) contains 0.2-80 wt.% of polyether alcohol with the functionality of > 1.5 and the hydroxyl value of 10-100 mg KOH/g and the physically active halogen-free foaming agent (c) is hydrocarbon of 3-10 carbon atoms.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a finely porous rigid foam by using an isocyanate as a base material, and further to provide an apparatus for carrying out the method. SOLUTION: This method for producing a finely porous rigid foam by reacting a polyisocyanate with a compound having at least two reactive hydrogen atoms in a hermetically sealed mold comprises (a) introducing a gas to the reactive components under pressure before inserting the reactive components into the mold, (b) pressurizing the mold before, during or after insertion of the reaction mixture, and (c) reducing the pressure in the mold after the insertion of the reaction mixture into the mold and before the hardening of the rigid foam.
Abstract:
PROBLEM TO BE SOLVED: To obtain the subject emulsion capable of generating a hard polyurethane foam having closed cells or open cells not containing a halogen, by making the emulsion include a reactive hydrogen atom-containing compound, a foaming agent, an auxiliary agent and an additive and using a specific emulsifying auxiliary agent. SOLUTION: This emulsion includes (A) a compound containing a hydrogen atom reactive with isocyanate, (B) a foaming agent and (C) an auxiliary agent and an additive. The emulsion includes a polyester alcohol of the formula (m) is 0-15; (n) is 0-1; (o) is 0-15; (p) is 0-1; (q) is 0-15; (r) is 0-1; (s) is 0-15; (t) is 0-1; (u) is 0-10; (v) is 0-15; (x) is 1-5; (y) is 1-4 or a mixture of 1 to 3 when (r+n)≠0; (z) is 0-3; (zi is 0.1-3; R1 is a fatty structural substance based on a multifunctional alcoholic structure not having OH group; R2 is a group of polycarboxylic acid not having COOH; R3 is an alcoholic group same as R1 } and the component B exists in an emulsified state in the component A and the component C.
Abstract:
PROBLEM TO BE SOLVED: To obtain an isocyanate-based rigid foam having an open-cell type micro pore by making an polyisocyanate react with a compound having a plural ity of active hydrogen atoms capable of reacting with the isocyanate in the presence of a water foaming agent, a catalyst, an auxiliary and an additive. SOLUTION: A polyisocyante is made to react with a compound containing a plurality of hydrogen atoms capable of reacting with an isocyante such as a hydroxyl group-containing ester represented by the formula having a functionally of 2-8 and a molecular weight of 300-8,000 in the presence of water and, if necessary, an organic compound acting as a physical foaming agent, a catalyst, an auxiliary and an additive to produce an open-cell type rigid foam represented by the formula (wherein (m) is 1-15; (n), (p), (r) and (t) are each 0-1; (o), (q), (s) and (v) are each 0-15; (u) is 0-10; X is 1-5; Y is 1-4; Z is 0-3; Zi is 0.1-3; R1 and R3 have each an aliphtic structure not containing a polyalcoholic hydroxyl group; and R2 is a group not containing COOH group of a polycarboxylic acid.
Abstract:
Isocyanate adducts (I) made by reacting polyisocyanate(s) with compounds containing at least 2 NCO-reactive hydrogens, showing a crystallinity of less than 10 J/g by DSC, and an aromatics content of less than 31 wt.%, given as carbon atoms in aromatic rings. An Independent claim is also included for a method for the production of (I) by reacting (a) at least difunctional isocyanates with (b) compound(s) with at least 2 NCO-reactive H atoms in presence of (c) catalysts, in which (b) comprise (bi) polyether-polyol(s) with a functionality of more than 2.5 and a mol. wt. of more than 300 (preferably 300-1000) and (bii) polyol(s) with a functionality of 1.7-3 and a mol. wt. of more than 1000, and the reaction is carried out with an isocyanate index of less than 200.
Abstract:
Preparation of polyurethane comprises reaction of polyisocyanates (a) with compound (b) with at least two isocyante group reactive hydrogen atoms in the presence of at least a compound (c) with at least a urethane group in the molecule that contains no isocyanate reactive groups.
Abstract:
A method for the production of polyurethanes (I) by reacting (a) polyisocyanates with (b) compounds with at least 2 NCO-reactive hydrogen atoms, in which (b) contains at least one compound (bi) with at least 2 NCO-reactive hydrogens and at least one urethane group, obtained by reacting (bi1) compounds with at least 2 amino groups with (bi2) compounds with hydroxyl groups and (bi3) urea, or by reacting non-functional urethanes with (bi4) compounds containing hydroxyl groups.
Abstract:
Production of a polyurethane foam with surface indentations comprises introducing a polyurethane foam system into a mold that has been coated with a lacquer in such a way that surface indentations are formed during foaming.