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US 5,750,580 AGranted
Polyurethane elastomers prepared from aliphatic polyisocyanates and polyesterether polyols
AssigneeBayer Aktiengesellschaft
InventorsEduard Mayer, Jurgen Gronen
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Abstract
This invention relates to polyurethane elastomers produced by the reaction of polyisocyanates with polyesterpolyether polyols (diester-polyether diols) using the reaction injection molding process (RIM).
Claims4
A polyurethane elastomer which optionally contains urea groups and comprises the reaction product of:
- a) at least one liquid polyisocyanate component selected from the group consisting of aliphatic polyisocyanates, alicyclic polyisocyanates and mixtures thereof,
- b) optionally, one or more isocyanate-reactive compounds having an average molecular weight of about 1000 to 6000 and an average functionality of at least two,
- c) from about 10 to about 42% by weight, based on 100% by weight of the reaction mixture without fillers, of at least one isocyanate-reactive compound comprising a polyesterether polyol having a molecular weight of less than 500 and a functionality of at least two, wherein said polyesterether polyol contains from 3 to 7 mol of ester groups/kg of polyesterether polyol, and an ethylene oxide content of from 40 to 60% by weight, and said polyesterether polyol consists of the reaction product of aromatic carboxylic acid anhydrides with (oligo)ethylene glycols, and subsequent ethoxylation, and
- d) 1 to 30% by weight, based on the total weight of all the components, of fillers,
- wherein components a) through d) are reacted via the reaction injection molding process.
2 more elements
A process for the production of polyurethane moldings having a closed surface, a density of greater than 0.9 g/cm.sup.3, optionally contains urea groups and are optionally cellular, by the reaction injection molding process of a reaction mixture comprising:
- a) at least one liquid polyisocyanate component selected from the group consisting of aliphatic polyisocyanates, alicyclic polyisocyanates and mixtures thereof,
- b) optionally, one or more isocyanate-reactive compounds having an average molecular weight of about 1000 to 6000 and an average functionality of at least two,
- c) from about 10 to about 42% by weight, based on 100% by weight of the reaction mixture without fillers, of at least one isocyanate-reactive compound comprising a polyesterether polyol having a molecular weight of less than 500 and a functionality of at least two, wherein said polyesterether polyol contains from 3 to 7 mol of ester groups/kg of polyesterether polyol, and an ethylene oxide content of from 40 to 60% by weight, and said polyesterether polyol consists of the reaction product of aromatic carboxylic acid anhydrides with (oligo)ethylene glycols, and subsequent ethoxylation, and
- d) 1 to 30% by weight, based on the total weight of all the components, of fillers.
1 more element
Dependencies are inferred from the claim text.