Method for producing cross-linkable redispersible powders containing isocyanate groups
AssigneeWacker Chemie AG
InventorHerbert Eck
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Abstract
The invention relates to a process for preparing crosslinkable redispersible powders containing isocyanate groups by aqueous, emulsion copolymerization of ethylenically unsaturated monomers, at least one of which is isocyonate-functional, followed by drying, preferably spray drying, in the presence of a protective colloid.
Claims20
A process for the preparation of crosslinkable dispersion powders which are redispersible in water and contain isocyanate groups, comprising copolymerizing by free-radical emulsion polymerization, one or more ethylenically unsaturated monomers in the presence of 0.2 to 6% by weight, based on the total weight of the monomers, of one or more ethylenically unsaturated isocyanates selected from the group consisting of meta- and para-isopropenyl-alpha, alpha-dimethylbenzylisocyanate and isocyanates of the general formula (I)
- CH2═CR1—CO—O—R2—CR3R4—N═C═O (I)
- where R1 is H or CH3, and R2 is an alkylene group having 1 to 18 C atoms, and R3 and R4 are identical or different alkyl groups having 1 to 4 C atoms;
- and drying the dispersions obtained by said copolymerization, wherein said emulsion polymerization and said drying are carried out in the presence of 5 to 70% by weight, based on the total weight of the monomers, of a protective colloid.
A process for the preparation of crosslinkable dispersion powders which are redispersible in water and contain isocyanate groups, comprising copolymerizing one or more ethylenically unsaturated monomers by means of free-radical emulsion polymerization in the presence of 0.2 to 6% by weight, based on the total weight of the monomers, of one or more ethylenically unsaturated isocyanates selected from the group consisting of meta- and para-isopropenyl-alpha, alpha-dimethylbenzylisocyanate and isocyanates of the general formula (I)
- CH2═CR1—CO—O—R2—CR3R4→N═C═O (I)
- where R1 is H or CH3, R2 is an alkylene group having 1 to 18 C atoms, and R3 and R4 are identical or different alkyl groups having 1 to 4 C atoms;
- and spray drying the dispersions obtained by said copolymerization, wherein said emulsion polymerization and said drying are carried out in the presence of 5 to 70% by weight, based on the total weight of the monomers, of a protective colloid.
Dependencies are inferred from the claim text.