Non-hot-melt 2,4-TDI-based polyurethane composition bearing NCO end groups and having a low content of TDI monomer, comprising at least one isocyanate compound of particular molar volume
AssigneeBostik SA
InventorsFederico Sanz, Guillaume Michaud
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Abstract
1) Polyurethane composition comprising: a) at least 98% by weight of at least one non-hot-melt polyurethane bearing NCO end groups based on 2,4-toluene diisocyanate, b) a TDI monomer content of less than 0.1% by weight, c) at least one particular isocyanate compound with a molar volume of less than or equal to 300 milliliters per mole. 2) Process for preparing a polyurethane composition as defined previously, and an adhesive composition formulated from such a polyurethane composition.
Claims11
A polyurethane composition comprising:
- a) at least 98% by weight of at least one polyurethane bearing NCO end groups based on 2,4-toluene diisocyanate (2,4-TDI), which is not solid at a temperature ranging from 5 to 35° C.,
- b) a TDI monomer content of less than 0.1% by weight,
- c) at least one isocyanate compound with a molar volume of less than or equal to 300 milliliters per mole (mL/mol) (noted compound A), in which the isocyanate group(s) are not linked to a carbon atom of an aromatic hydrocarbon-based ring,
- the weight percentages being expressed relative to the total weight of said composition.
A method for stabilizing the viscosity of a composition comprising at least 98% by weight of at least one polyurethane based on 2,4-TDI bearing NCO end groups, which is not solid at a temperature ranging from 5 to 35° C., and a TDI content of less than 0.1% by weight relative to the weight of said composition, comprising adding to said composition at least one isocyanate compound with a molar volume of less than or equal to 300 milliliters per mole other than TDI, which isocyanate compound does not have isocyanate groups linked to a carbon atom of an aromatic hydrocarbon ring.
Dependencies are inferred from the claim text.