| 摘要 |
A two-component foam system for preparation of building foams with a polyol component, catalyst for polyol-polyisocyanate reaction, water and/or compressed gaseous or liquid propellant, and polyisocyanate component, where the weight ratio of polyol to polyisocyanate is such that the mole ratio of isocyanate groups of the polyisocyanate to the polyol OH groups is preferably 1:1 to 2:1, and the system contains an aqueous polymer dispersion is new. A two-component foam system for preparation of foams for building purposes with a polyol component (A) which contains at least one polyol, optionally a catalyst for reaction of the polyol with polyisocyanate, water and/or propellant based on a compressed or liquid gas as foam builder, and a polyisocyanate component (B) containing at least one polyisocyanate, where the weight ratio of polyol to polyisocyanate is so fixed that at specific degrees of mixing of the components A and B the mole ratio of the isocyanate groups of the polyisocyanate to the polyol OH groups is 1:5 to 10:1, preferably 1:1 to 2:1, and A contains an aqueous polymer dispersion |
