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US 12,497,510 B2Granted
Polyurea composition with a low content in monomeric diisocyanates
AssigneeSika Technology AG
InventorsJordan Holmes, Alison Thomson, Stephen Glover, Michelle Round, Alexander Coward, Mark Gatrell, Mike Byrne
Life of this patent
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Abstract
A polyurea composition containing monomeric diisocyanates in an amount of max. 0.5 wt. % and consisting of a first component containing a primary, aromatic diamine and a second component containing an isocyante-group-containing polyether urethane polymer containing monomeric diisocyantes in an amount of max. 0.5 wt. % and an aliphatic polyisocyanate with an NCO content of 8 to 25 wt. %.
Claims14
A polyurea composition having a monomeric diisocyanate content of not more than 0.5% by weight, comprising
- a first component A containing:
- at least one primary aromatic diamine A1 selected from the list consisting of diethyltoluenediamine, 4,4′-methylenebis(2,6-diethyl)aniline, 4,4′-methylenebis(2,6-diisopropyl)aniline, 4,4′-methylenebis(3-chloro-2,6-diethyl)aniline and dimethylthiotoluenediamine;
- a second component B containing:
- at least one polyetherurethane polymer B1 containing isocyanate groups and having a monomeric diisocyanate content of not more than 0.5% by weight, obtained from the reaction of a monomeric diisocyanate, which is diphenylmethane 4,4′-diisocyanate, with at least one polyether polyol in an NCO/OH ratio of at least 3/1, and subsequent removal of a majority of the monomeric diisocyanates by means of a suitable separation method, and
- at least one aliphatic polyisocyanate B2 having an NCO content of 8% to 25% by weight;
- where the weight ratio B1/B2 is in the range of 8-30.
3 more elements
Dependencies are inferred from the claim text.