Aqueous dispersion of a polyurethane containing blocked reactive sites

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United States of America Patent

PATENT NO 6544592
SERIAL NO

09857005

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Abstract

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The invention relates to an aqueous dispersion of a crosslinkable polyurethane obtained by chain extension of a polyurethane prepolymer with a compound containing hydrazone functions having general formula (1), wherein Q.sup.1 and Q.sup.2 is a hydrazone functional group of formula (2), H or R.sup.1, R and R.sup.1 in formula (1) is an organic group which has no reactivity towards the hydrazone function, R.sup.2 and R.sup.3 in formula (2) is an organic group which has no reactivity towards the hydrazone function or H, x has a value from 1 to 10, and is preferably from 1 to 4 with the proviso that at least one of the groups Q.sup.1 or Q.sup.2 is of formula (2). The invention relates also to a process for a preparation of an aqueous dispersion of a crosslinkable polyurethane containing hydrazne functions, and to the application of the aqueous dispersion of a crosslinkable polyurethane together with a polyisocyanate, a polyketone--or a polyepoxide--functional material onto a substrate. ##STR1##

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Patent OwnerAddress
STAHL INTERNATIONAL B V5145 PE WAALWIJK

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hesselmans, Laurentius Cornelius Josephus 's-Hertogenbosch, NL 4 20
Van, Den Goorbergh Johanna Antonia Maria Waalwijk, NL 1 1

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Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges2637315873281278241701 - 1011 - 2021 - 3031 - 4041 - 5051 - 6061 - 7071 - 8081 - 9091 - 100100 +0255075100125150175200225250275300325350375400

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