US 11,186,670 B2Granted

Polyol system for preparing polyurethane

AssigneeCovestro Intellectual Property GmbH & Co. KG

InventorsErika Zhu, Ling Shi, Hua Lu, Jun Li, Chenxi Zhang

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Abstract

The present application discloses a polyol system for preparing polyurethane comprising: i) at least one active chain extender having at least two groups that can react with an isocyanate, wherein at least one group that can react with an isocyanate is free primary —NH2 group; ii) at least one active chain extender having three groups that can react with an isocyanate, wherein at least one group that can react with an isocyanate is free primary —OH group, and iii) at least one polyether polyol starting from an amine. The polyol system according to the present disclosure is phase-stable without layering and capable of releasing mold quickly after reacting with an isocyanate to produce polyurethane.

Claims15

Dependent claims

A polyol system for preparing polyurethane comprising:

1-25 parts by weight, based on a total 100 parts by weight of the polyol system, of i) at least one active chain extender having at least two groups that can react with an isocyanate, wherein at least one group of the at least two groups that can react with an isocyanate is a free primary —NH2 group;
1-20 parts by weight, based on a total 100 parts by weight of the polyol system, of ii) at least one active chain extender having three groups that can react with an isocyanate, wherein at least one group of the three groups that can react with an isocyanate is a free primary —OH group, and wherein the at least one active chain extender having three groups that can react with an isocyanate is selected from trihydric alcohols having 3-8 carbon atoms;
1-10 parts by weight, based on a total 100 parts by weight of the polyol system, of iii) at least one polyether polyol starting from an amine;
and
50-80 parts by weight, based on a total 100 parts by weight of the polyol system, of iv) a basic polyether polyol.

2 more elements

Dependencies are inferred from the claim text.