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US 2014/0370267 A1Published application
Composite elements with improved dimensional stability
AssigneeBayer Intellectual Property GmbH
InventorsRolf Roers, Torsten Hagen, Rene Abels, Inge Tinnefeld, Walter Schindler
Life of this patent
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Abstract
The present invention relates to a polyurethane/polyisocyanurate foam with improved dimensional stability. It relates further to the use thereof in the production of metal composite elements, to metal composite elements produced therewith, and to a method for producing metal composite elements.
Claims13
-12. (canceled)
A polyurethane/polyisocyanurate foam, obtained from the reaction of
- A) an isocyanate-reactive composition comprising
- A1) from 0 to 15 wt. % of at least one polyester polyol having a hydroxyl number in the range of from 300 mg KOH/g to 1000 mg KOH/g, determined in accordance with DIN 53240,
- A2) from 1 to 15 wt. % of at least one polyether polyol having a hydroxyl number in the range of from 300 mg KOH/g to 600 mg KOH/g, determined in accordance with DIN 53240,
- and
- A3) from 50 to 70 wt. % of at least one polyester polyol having a hydroxyl number in the range of from 80 mg KOH/g to 290 mg KOH/g, determined in accordance with DIN 53240,
- wherein the data in wt. % are based in each case on all the components of the isocyanate-reactive composition A);
- with
- B) a polyisocyanate component,
- wherein the equivalent ratio of NCO groups to the sum of the hydrogen atoms reactive towards NCO groups is from ≧150:100 to ≦500:100,
- wherein the polyether polyol A2) is a polyether polyol A2) started with an aromatic amine.
7 more elements
Dependencies are inferred from the claim text.