Nitrogen-free and low-nitrogen crosslinking additives for cold-cure flexible slabstock foam having improved compression and aging properties
AssigneeEvonik Operations GmbH
InventorsHarald Modro, Kai-Oliver Feldmann, Mladen Vidakovic, Rüdiger Landers, Daniela Hermann
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Abstract
Process for producing cold-cure flexible slabstock PU foams by reaction of at least one polyol component and at least one isocyanate component in the presence of water and at least one catalyst and at least one crosslinker, wherein no nitrogen-containing crosslinkers having an expanded OH number above 1000 mg KOH/g are employed in a total amount >0.5 parts by weight, preferably >0.1 parts by weight, based on 100 parts by weight of polyol.
Claims20
A process for producing cold-cure flexible slabstock PU foams by reaction of at least one polyol component and at least one isocyanate component in the presence of water and at least one catalyst, comprising at least one tin catalyst, and at least one crosslinker, wherein no nitrogen-containing crosslinkers having an expanded OH number above 1000 mg KOH/g are employed in a total amount >0.5 parts by weight, based on 100 parts by weight of polyol,
- wherein nitrogen-containing crosslinkers in the context of the present invention have a nitrogen content of >0.5% by weight, measured by Kjeldahl analysis, % by weight based on the respective crosslinker,
- and wherein at least two nitrogen-free or low-nitrogen crosslinkers having a nitrogen content of ≤0.5% by weight, measured by Kjeldahl analysis, % by weight based on the respective crosslinker, are employed in a total amount ≥0.1 parts by weight, based on 100 parts by weight of polyol,
- and wherein not more than 4 parts of water per 100 parts of polyol are employed and wherein, based on the total polyol component, >50% by weight of cold-cure flexible foam ether polyols having molar masses of >1500 g/mol per OH group are employed and wherein the individual crosslinkers have a functionality of isocyanate-reactive groups of ≥3
- and wherein isocyanates suitable as isocyanate components include all isocyanates containing at least two isocyanate groups
- and wherein the isocyanate index is >95 and ≤115
- and wherein less than 2 parts polyester ether having an OH number of 55 to 57 mg KOH/g per 100 parts of polyol is employed.
A crosslinking solvent-containing, additive for use in cold-cure flexible slabstock PU foam formulations comprising >0% to 50% by weight of solvent, and 50% to <100% by weight of crosslinker, comprising at least two nitrogen-free or low-nitrogen crosslinkers having a nitrogen content of ≤0.5% by weight, measured by Kjeldahl analysis, % by weight based on the respective crosslinker, said crosslinker preferably comprising sugar alcohol(s) and/or glycerols/their derivatives, but at least one crosslinker from the group of sugar alcohols and at least one crosslinker from the group of glycerols/their derivatives, with the proviso that no nitrogen-containing crosslinkers having an expanded OH number above 1000 mg KOH/g are employed in a total amount >5% by weight, based on 100% by weight of the solvent-containing additive.
A crosslinking solvent-containing additive for use in cold-cure flexible slabstock PU foam formulations comprising >0% to 50% by weight of water and 50% to <100% by weight of crosslinker, comprising at least two nitrogen-free or low-nitrogen crosslinkers having a nitrogen content of ≤0.5% by weight, measured by Kjeldahl analysis, % by weight based on the respective crosslinker, said crosslinker comprising sugar alcohol(s) and/or glycerols/their derivatives, but at least one crosslinker from the group of sugar alcohols and at least one crosslinker from the group consisting of sorbitol, maltitol, diglycerol and triglycerol, wherein no nitrogen-containing crosslinkers having an expanded OH number above 1000 mg KOH/g are employed in a total amount >1% by weight, based on 100% by weight of the solvent-containing additive.
Dependencies are inferred from the claim text.