US 4,734,439 A · Foam-containing polyurethane(urea) compositions and process for the preparation thereof

Abstract

This invention relates to polyurethane(urea) compositions which contain foam and which are preferably cationically modified, contain non-abrasively bonded fillers and have a very high water absorbability (WAF). Production is effected by reacting isocyanate-terminated prepolymers with a quantity of water far exceeding the stoichiometric quantity in the presence of foams in particle or film form. The reaction mixture may also contain lignite powder and/or peat, other inorganic and organic fillers and/or biomasses (living cells, living bacteria, enzymes). The polyurethane(urea) compositions contain up to 95% by weight of foam particles and may contain further fillers (preferably lignite and/or peat). The compositions are swollen and have a high water content during production. Their water absorbability (WAF) when suspended in water is 33 to 97% by weight of water. They can be used as carriers in microbic synthesis processes for the production of complicated organic compounds (when they have incorporated biomasses) as special carriers for the growth of plants, as filter agents or as adsorbents for non water-soluble liquids [for example, crude oil or petrol].

Claims29

Dependent claims

A process for the production of a foam-containing polyurethane(urea) composition in finely divided or particulate form comprising reacting:

(A) at least one di- and/or polyfunctional isocyanate-terminated prepolymer having an isocyanate group content of from 2 to 12% by weight,
(B) from 0 to 50% by weight based on the weight of (A) of a lower molecular weight organic di- and/or polyisocyanate, with the mixture of (A) and (B) having an isocyanate group content of 30% by weight or less,
(C) water in an amount of from two to sixty times the weight of components (A) and (B),
(D) from 0 to 5.0 equivalent % based on total isocyanate equivalents in (A) and (B) of an organic di- and/or polyamine, in the presence of
(E) from 3 to 95% by weight of a synthetic resin foam in the form of particles,
(F) from 0 to 90% by weight of lignite and/or peat, and
(G) from 0 to 90% by weight of other organic and/or inorganic fillers wherein the percents by weight of (E), (F) and (G) are based on the total moisture-free weight of components (A), (B), (D), (E), (F) and (G) and wherein the sum of components (E), (F) and (G) is from 5 to 95% by weight based on the total moisture-free weight of said components (A), (B), (D), (E), (F) and (G), said foam containing polyurethane(urea) compositions having a water-absorbability of from 33 to 97% by weight, and whereby said foam absorbs the isocyanate and any added filler uniformly both on the external surfaces of said foam and on the internal surfaces of the cells of said foam.

4 more elements

Dependencies are inferred from the claim text.

Foam-containing polyurethane(urea) compositions and process for the preparation thereof

Life of this patent

Foam-containing polyurethane(urea) compositions and process for the preparation thereof

Life of this patent

Abstract

Claims29