Elasticized addition product based on polyalkylene ether-polyols and polyisocyanates, preparation and use thereof

A process for the preparation of an elasticized addition product comprising the steps:

• reacting (a) a polyalkylene ether-polyol having a molecular weight of 500 to 10,000 and 2 to 6 C atoms in the alkylene radical with (b) a polyisocyanate at a temperature of 50.degree. to 100.degree. C. in the presence of a catalyst, the ratio of the NCO groups in the component (b) to the OH groups in the component (a) being 1.5:1 to 2.5:1, followed by further reacting the product of (a) with (b) at ambient or at a temperature up to 150.degree. C. with a hydroxyl compound selected from the group consisting of:
• (c) an imidazoline of the formula I ##STR5## wherein R is hydrogen or alkyl having 1 to 4 C atoms, R.sup.1 is (c1) hydrogen, (c2) hydroxyalkyl and alkyl having 1 to 12 C atoms in each case, (c3) --CH.sub.2 --R.sup.5,
• (c4) --CH.sub.2 --CH.sub.2 --COOR.sup.5, ##STR6## (c6) --CH.sub.2 --CH.sub.2 --CN wherein R.sup.5 represents in each case hydroxyalkyl or alkyl having up to 8 C atoms, R.sup.2 denotes (c7) alkyl or alkylene having in each case 1 to 12 C atoms or denotes one of the radicals (c3) to (c6), R.sup.3 and R.sup.4 each denote hydrogen or alkyl having 1 to 5 C atoms or R.sup.3 and R.sup.4 together denote alkylene having 4 to 6 C atoms, and (d) a hexahydropyrimidine derivative of the general formula ##STR7## wherein R.sup.1 to R.sup.5 have the meaning as mentioned under (c), at least one of each of the substituents R.sup.1 to R.sup.5 in the formulae (I) and (II) carrying a hydroxyl group and the ratio of NCO groups to the OH groups of component (c) and (d) or a mixture thereof is approximately 1:1, and isolating the product so produced.