Allophonate modified polyisocyanates
AssigneeBayer MaterialScience AG
InventorsDavid Zielinski, Myron Shaffer, Michael 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.
Claims28
A composition comprising 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,
- wherein the isocyanate group-containing compounds are the reaction products of an isocyanate and a combination of saturated alcohols, and contain 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, a divalent cycloaliphatic hydrocarbon group having from 5 to 15 carbon atoms, and a divalent araliphatic hydrocarbon group having from 7 to 15 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, a divalent cycloaliphatic hydrocarbon group having from 5 to 15 carbon atoms, and a divalent araliphatic hydrocarbon group having from 7 to 15 carbon atoms, wherein R2 can optionally include from 1 to 3 NCO groups;
- and
- R3 is selected from the group consisting of a C1 to C32 linear, branched or cyclic aliphatic, cycloaliphatic, araliphatic, or aromatic hydrocarbon group, a —CH3 terminated polyether, a polyester, and a polyurethane.
(canceled)
The composition according to claim 21 wherein R1 is a divalent aliphatic hydrocarbon group having from 4 to 12 carbon atoms, R2 is a divalent aliphatic hydrocarbon group having from 4 to 12 carbon atoms, and R3 is a C1-C12 linear or branched aliphatic hydrocarbon.
(canceled)
A two component elastomeric coating composition that includes a component A comprising isocyanate group containing compounds containing on average
- 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
- which is substantially free of uretdione groups;
- and
- a component B comprising a compound containing one or more functional groups that are reactive with isocyanate groups.
A process for coating a substrate comprising:
- a) providing a surface of a substrate;
- b) contacting the surface with an elastomeric composition comprising:
- a component A comprising isocyanate group containing compounds containing on average
- 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
- which is substantially free of uretdione groups;
- 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.