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US 4,596,835 AGranted
Reinforced cellular or noncellular polyurethane molded parts
AssigneeBASF SE
InventorsFrank Werner, Rainer Blum, Peter Horn, Martin Welz, Rolf Osterloh
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AssigneeBASF SE
InventorsFrank Werner, Rainer Blum, Peter Horn, Martin Welz, Rolf Osterloh
Estimating the term…
Reinforced cellular or noncellular molded polyurethane parts are prepared by heating a mixture of reinforcing materials and a heat-curable composition of polyisocyanates and polyols in an open or closed mold, said composition being storage-stable at room temperature and containing, optionally, auxiliaries and additives. In said composition, the polyisocyanate is dispersed in the form of discreet particles having particle diameters from 0.1 to 150 .mu.m in the polyol and the polyisocyanate particles are deactivated on their surfaces such that from 0.01 to 20 equivalent percent of the total available isocyanate groups are deactivated and such that the ratio of free isocyanate groups to hydroxyl groups is from 0.7:1 to 2.5:1. The polyurethane molded parts are suitable for use as self-supporting trim parts, reinforcement parts, or molded parts for various applications.
A reinforced cellular or noncellular polyurethane molded article prepared by heating a reinforcing material with a room-temperature storage-stable, heat-curable mixture of polyisocyanate and polyol including necessary auxiliaries and additives wherein the polyisocyanate is present as surface-inactivated particles dispersed in the polyol, said reinforcing material employed in amounts from 20 to 70 weight percent of the fully cured polyurethane molded article.
A process for the preparation of reinforced cellular or noncellular polyurethane molded parts by reacting organic polyisocyanates and polyols in the presence of reinforcing materials and necessary auxiliaries and additives with the addition of heat in open or closed molds wherein the polyisocyanates and polyols are used in the form of a mixture which is heat curable and is storage stable at room temperature, wherein the polyisocyanate is dispersed in said mixture in the form of discrete particles having particle diameters from 0.1 to 150 .mu.m and the polyisocyanate particles are deactivated on their surfaces, and wherein from 0.01 to 20 equivalent percent of all isocyanate groups present are deactivated.
Dependencies are inferred from the claim text.