US 4,374,935 A · Process for the preparation of flexible polyurethane foams employing polyester-polyether polyol mixtures

Abstract

The invention concerns a process for the preparation of flexible polyurethane foams having good hydrolytic stability, improved damping, with equal or higher levels of other physical properties and with a high absorption capacity. The foams are prepared by reacting organic polyisocyanates and mixtures of (a) liquid polyester polyols, which are produced by the polycondensation of organic dicarboxcylic acid and a polyol mixture which contains 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and at least one triol, and (b) di- to tetra-functional polyether polyols having molecular weights of 1500 to 6000 in the presence of catalysts and blowing agents as well as optionally chain extenders, auxiliaries, and additives.

Claims7

Dependent claims

A process for the preparation of flexible polyurethane foams by reacting organic polyisocyanates, polyhydroxyl compounds and optionally chain extenders in the presence of catalysts and blowing agents as well as auxiliaries wherein the polyhydroxyl compounds consist of mixtures of

(a) liquid polyester polyols with hydroxyl numbers of 40 to 80 and molecular weights of 1500 through 5000 which are produced by polycondensation of organic dicarboxylic acids with a polyol mixture which contains based on the overall polyol weight:
10 to 50 weight of 1,4-butanediol,
30 to 60 percent by weight of 1,5-pentanediol,
8 to 35 percent by weight of 1,6-hexanediol, and
2 to 15 percent by weight of at least one triol, and
(b) di- to tetra-functional polyether polyols having molecular weights of 1500 to 6000.

3 more elements

Dependencies are inferred from the claim text.

Process for the preparation of flexible polyurethane foams employing polyester-polyether polyol mixtures

Life of this patent

Process for the preparation of flexible polyurethane foams employing polyester-polyether polyol mixtures

Life of this patent

Abstract

Claims7