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US 8,575,244 B2Granted
Solvents in the preparation of polyuretherane dispersions
AssigneeBASF SE
InventorsGerd Buelow, Manfred Dargatz, Karl Haeberle, Maria Teresa Hechavarria Fonseca, Karl Ott, Juan Salgado-Valle, Tobias Wabnitz
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Abstract
The present invention relates to substituted N-(cyclo)alkylpyrrolidones as solvents for use in processes for preparing polyurethane dispersions.
Claims17
An aqueous polyurethane dispersion comprising a substituted N-(cyclo)alkylpyrrolidone (SCAP) of formula (1)
- wherein
- R1 is an alkyl radical having 1 to 18 C atoms or a cycloalkyl radical having 3 to 18 C atoms, and
- R2, R2′, R3, R3′, R4 and R4′ are each independently selected from the group consisting of a hydrogen atom, an alkyl radical having 1 to 18 C atoms and a cycloalkyl radical having 3 to 18 C atoms,
- wherein at least one selected from the group consisting of R2, R2′, R3, R3′, R4 and R4′ is not a hydrogen atom.
1 more element
A process for preparing a polyurethane dispersion, the process comprising:
- (I) preparing a polyurethane by reacting a diisocyanate or polyisocyanate with a diol in the presence of a substituted N-(cyclo)alkylpyrrolidone (SCAP) of formula (1)
- wherein
- R1 is an alkyl radical having 1 to 18 C atoms or a cycloalkyl radical having 3 to 18 C atoms, and
- R2, R2′, R3, R3′, R4 and R4′ are each independently selected from the group consisting of a hydrogen atom, an alkyl radical having 1 to 18 C atoms and a cycloalkyl radical having 3 to 18 C atoms,
- wherein at least one selected from the group consisting of R2, R2′, R3, R3′, R4 and R4′ is not a hydrogen atom;
- and then
- (II) dispersing the polyurethane in water,
- to obtain a polyurethane dispersion.
5 more elements
Dependencies are inferred from the claim text.