PRODUCTION OF VISCOELASTIC POLYURETHANE SYSTEMS USING BLOCK POLYMERS HAVING BONDED SILOXANE BLOCKS AS CELL OPENERS

摘要

The use of bonded siloxane block polymers of the general average formula (I) MaM1bDcD1d TeQfGg as additive in the production of PUR foam using at least one polyol component and at least one isocyanate component, wherein the polyol component used has an average hydroxyl number, determined to DIN 53240-1:2012-07, of >56 to <450 mg KOH/g, preferably 57-300 mg KOH/g, and wherein the PUR foam is produced at an isocyanate index of 65 to 108, is described.

主权项

1. A method of producing a polyurethane foam, said method comprising:
foaming a mixture comprising at least one isocyanate component and at least one polyol component in the presence of bonded siloxane block polymers of the average general formula
MaM1bDcD1dTeQfGg   formula (I)with G=independently identical or different radicals from the group of: (O1/2nSiRm—CH2CHR3—R2—CHR3CH2—SiRmO1/2)n, (O1/2nSiRm—CH2CHR3—R2—CR3═CH2, (O1/2nSiRm—CH2CHR3—R2—CR3═CR3—CH3, a=0-20, b=0-20, c=3-450, d=0-40, e=0-20, f=0-20, g=0.1-3, where a+b≧2 and N=a+b+c+d+e+f+g≧11 and ≦500, b+d≧1, R=independently identical or different alkyl radicals having 1-16 carbon atoms or aryl radicals having 6-16 carbon atoms or H or —OR3, R1=independently identical or different polyether radicals, R2=independently identical or different divalent organic radicals, R3=independently identical or different alkyl radicals having 1-16 carbon atoms or aryl radicals having 6-16 carbon atoms or H, n=independently 1 or 2, m=independently 1 or 2, m+n=3, wherein said at least one polyol component has an average hydroxyl number, determined to DIN 53240-1:2012-07, of >56 to <450 mg KOH/g, and wherein said PUR foam is produced at an isocyanate index of 65 to 108.