Patent ID: 6242515
Filing Date: 2001-06-05
Classification: C09D,C09K,Y10T

Abstract:
A method of coating polyurethane foams, which comprises applying to polyurethane foams a coating composition containing a binder comprising as component a) at least one aqueous dispersion of a polymer having functional groups --X--Y--R.sup.1, wherein:R.sup.1 is alkyl, aryl or arylalkyl;Y is C.dbd.O;--X-- is a single bond, alkylene, arylene, --R--O--R.sup.3, R.sup.2 --Z--O--R.sup.3, --R.sup.2 --Z--CH.sub.2 --R.sup.3, --R.sup.2 --Z--N(R.sup.4)--R.sup.3 --, R.sup.2 --O--Z--O--R.sup.3, --R.sup.2 --O--Z--CH.sub.2 --R.sup.3, --R.sup.2 --O--Z--N(R.sup.4)--R.sup.3 --, R.sup.2 --N(R.sup.5)--Z--O--R.sup.3 --, --R.sup.2 --N(R.sup.5)--Z--CH.sub.2 --R.sup.3 --, or --R.sup.2 --N(R.sup.5)--Z--N(R.sup.4)--R.sup.3 --;wherein--R.sup.2 -- is a single bond, alkylene, oxyalkylene, polyoxyalkylene or arylene and is attached to the polymer;--R.sup.3 -- is alkylene or arylene, and is attached to Y;Z is SO.sub.2 or C.dbd.O; andR.sup.4 and R.sup.5 each are independently hydrogen alkyl, aryl, aralkyl or a group--R.sup.3 --Y--R.sup.1 --, where Y, R.sup.1 and R.sup.3 are as defined above;and having a glass transition temperature below 10.degree. C. and above -60.degree. C.; andas component b) at least one crosslinking compound having at least two NH.sub.2 groups per molecule which is selected from di- or poly-hydrazides of di- or poly-carboxylic acids, except compositions containing a water-soluble metal salt of lead, zinc, manganese or cobalt.