Allophanate modified polyisocyanates
AssigneeBayer MaterialScience AG
InventorsDavid P. Zielinski, Myron Shaffer, Michael K. Jeffries
Life of this patent
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Abstract
A composition that includes isocyanate group containing compounds that include on average i) a NCO functionality less than or equal to 3.5; and ii) from 1.5 to 8 percent by weight, based on the isocyanate containing compound, of allophanate groups; and which is substantially free of uretdione groups. The composition can be used in two component elastomeric coating compositions that include a component A the above-described composition and a component B that includes a compound containing one or more functional groups that are reactive with isocyanate groups. The elastomeric coating compositions can be used to coat substrates.
Claims19
A two component elastomeric coating composition that includes
- a component A comprising isocyanate group containing compounds containing
- i) a mean NCO functionality less than or equal to 3.5;
- and
- ii) from 1.5 to 8 percent by weight, based on the isocyanate containing compound, of allophanate groups;
- and
- iii) one or more structural units conforming to the following formula
- wherein
- R1 is selected from the group consisting of a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, wherein R1 can optionally include from 1 to 3 NCO groups;
- R2 is selected from the group consisting of a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, wherein R2 can optionally include from 1 to 3 NCO groups;
- and
- R3 is selected from the group consisting of a C2 to C32 linear or branched hydrocarbon group, a —CH3 terminated polyether, a polyester, and a polyurethane;
- wherein component A is substantially free of uretdione groups and is at least 90% aliphatic, based on the weight of component A;
- and
- a component B comprising a compound containing one or more functional groups that are reactive with isocyanate groups.
Dependencies are inferred from the claim text.