Preparation of rigid polyurethane foams having retarded reactivity
First Claim
1. A process for the preparation of rigid polyurethane foams having retarded reactivity by reacting organic and/or modified organic polyisocyanates (a) with a polyol mixture (b) and, if required, further compounds (c) having hydrogen atoms reactive toward isocyanates, in the presence of water (d), catalysts (e), flameproofing agents (f), blowing agents (g) and, if required, further assistants and additives (h), wherein the polyol mixture (b) consists of b1) at least one difunctional to octafunctional polyetherol based on ethylene oxide and, if required, propylene oxide and/or butylene oxide, the ethylene oxide content being more than 30% by weight, based on the total amount of alkylene oxide used, and having an OH number of from 200 to 1 300 mg KOH/g and b2) at least one polyetherol based on propylene oxide and/or butylene oxide and, if required, ethylene oxide, having an OH number of from 100 to 1 000 mg KOH/g, the ethylene oxide content being not more than 30% by weight.
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Abstract
Rigid polyurethane foams having a retarded reactivity are prepared by reacting organic and/or modified organic polyisocyanates (a) with a polyol mixture (b) and, if required, further compounds (c) having hydrogen atoms reactive toward isocyanates, in the presence of water (d), catalysts (e), flameproofing agents (f), blowing agents (g) and, if required, further assistants and additives (h), by a process in which the polyol mixture (b) consists of
b1) at least one difunctional to octafunctional polyetherol based on ethylene oxide and, if required, propylene oxide and/or butylene oxide, the ethylene oxide content being more than 30% by weight, based on the total amount of alkylene oxide used, and having an OH number of from 200 to 1 300 mg KOH/g and
b2) at least one polyetherol based on propylene oxide and/or butylene oxide and, if required, ethylene oxide, having an OH number of from 100 to 1 000 mg KOH/g, the ethylene oxide content being not more than 30% by weight.
The resulting rigid polyurethane foams themselves having retarded reactivity are used as insulating, construction and packaging material.
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11 Claims
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1. A process for the preparation of rigid polyurethane foams having retarded reactivity by reacting organic and/or modified organic polyisocyanates (a) with a polyol mixture (b) and, if required, further compounds (c) having hydrogen atoms reactive toward isocyanates, in the presence of water (d), catalysts (e), flameproofing agents (f), blowing agents (g) and, if required, further assistants and additives (h), wherein the polyol mixture (b) consists of
b1) at least one difunctional to octafunctional polyetherol based on ethylene oxide and, if required, propylene oxide and/or butylene oxide, the ethylene oxide content being more than 30% by weight, based on the total amount of alkylene oxide used, and having an OH number of from 200 to 1 300 mg KOH/g and b2) at least one polyetherol based on propylene oxide and/or butylene oxide and, if required, ethylene oxide, having an OH number of from 100 to 1 000 mg KOH/g, the ethylene oxide content being not more than 30% by weight.
Specification