# US 4,391,964 A · Embedding mass of polyurethane > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,391,964 A - Document ID: US4391964A - Status: Granted - Kind: A - Application number: 06/351,140 - Filed: 1982-02-22 - Granted: 1983-07-05 - Earliest claimed: 1981-02-21 - Assignees: Akzo N.V. - Inventors: Gerhard Wick; Helmut Schulze - Web page: https://patentgrep.com/patent/US4391964A ## CPC - C08G 18/8051: {with compounds of C08G18/36} - B01D 63/023: {Encapsulating materials} - C08G 18/222: {metal compounds not provided for in groups C08G18/225 - C08G18/26} - C08G 18/3206: {aliphatic} - C08G 18/36: Hydroxylated esters of higher fatty acids - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract Embedding mass of polyurethane produced on the basis of castor oil, and a method for its production, wherein an aromatic diisocyanate is reacted with a mixture of castor oil and trimethylolpropane into an NCO-group displaying pre-adduct, the pre-adduct being mixed for network polymerization with castor oil or a mixture of castor oil and trimethylolpropane, and after embedding the mixture is hardened in the presence of catalyst, thereby characterized in that a titanium alkylate compound is used as catalyst in amounts from 7 to 700 ppm, calculated as elemental titanium. Preferably, the catalyst is a titanium tetraalkylate; in particular titanium tetrabutylate. Also, a titanium magnesium hexaalkylate may be used as titanium alkylate compound; preferably, titanium magnesium hexabutylate. Preferably the catalyst is present in amounts from 40 to 140 ppm, calculated as elemental titanium. The embedding mass may be used for the embedding of membranes, particularly in artificial organs, especially in the form of hollow filaments, tube foils or flat foils. They may be used for selectively working dialysators, including selectively working hemodialysators, and other arrangements for the detoxification of blood. The embedding is performed according to the casting process, preferably the centrifuge casting process. ## Claims ### Claim 1 Embedding mass of polyurethane produced on the basis of castor oil, composed of a polyurethane which has been obtained through reaction of an aromatic diisocyanate with a mixture of castor oil and trimethylolpropane into an NCO-group displaying pre-adduct and network polymerization of the pre-adduct with castor oil or a mixture of castor oil and trimethylolpropane, in the presence of catalyst, thereby characterized in that the embedding mass contains 7-700 ppm of a titanium alkylate compound, calculated as elemental titanium. ### Claim 2 (depends on 1) Embedding mass according to claim 1, wherein the embedding mass contains a titanium tetraalkylate as titanium alkylate compound. ### Claim 3 (depends on 2) Embedding mass according to claim 2, wherein the embedding mass contains titanium tetrabutylate as titanium tetraalkylate. ### Claim 4 (depends on 1) Embedding mass according to claim 1, wherein the embedding mass contains a titanium magnesium hexaalkylate as titanium alkylate compound. ### Claim 5 (depends on 4) Embedding mass according to claim 4, wherein the embedding mass contains titanium magnesium hexabutylate as titanium magnesium hexaalkylate. ### Claim 6 (depends on 1) Embedding mass according to claim 1, wherein the titanium compound is present in amounts from 40 to 140 ppm, calculated as elemental titanium. ### Claim 7 Method for the production of an embedding mass of polyurethane comprising reacting an aromatic diisocyanate in stoichiometric excess with a mixture of castor oil and trimethylolpropane into an NCO-group displaying pre-adduct, mixing the pre-adduct for network polymerization with castor oil or a mixture of castor oil and trimethylolpropane, and hardening the mixture after embedding, in the presence of catalyst, thereby characterized in that a titanium alkylate compound is used as catalyst in amounts from 7 to 700 ppm, calculated as elemental titanium. ### Claim 8 (depends on 7) Method according to claim 7, wherein a titanium tetraalkylate is used as titanium alkylate compound. ### Claim 9 (depends on 8) Method according to claim 8, wherein titanium tetrabutylate is used as titanium tetraalkylate. ### Claim 10 (depends on 7) Method according to claim 7, wherein a titanium magnesium hexaalkylate is used as titanium alkylate compound. ### Claim 11 (depends on 10) Method according to claim 10, wherein titanium magnesium hexabutylate is used as titanium magnesium hexaalkylate. ### Claim 12 (depends on 7) Method according to claim 7, wherein the titanium compound is used in amounts from 40 to 140 ppm, calculated as elemental titanium. ### Claim 13 (depends on 7) Method according to claim 7, wherein the hardening of the embedding mass is performed at room temperature. ### Claim 14 (depends on 1) Use of the embedding mass according to claim 1, for the embedding of membranes. ### Claim 15 (depends on 14) Use of the embedding mass according to claim 14 for the embedding of membranes in artificial organs. ### Claim 16 (depends on 1) Use of the embedding mass according to claim 1, for the embedding of membranes in the form of hollow filaments, tube foils or flat foils. ### Claim 17 (depends on 1) Use of the embedding mass according to claim 1, in selectively working dialysators. ### Claim 18 (depends on 17) Use of the embedding mass according to claim 17, in selectively working hemodialysators. ### Claim 19 (depends on 1) Use of the embedding mass according to claim 1, for detoxification of blood. ### Claim 20 (depends on 1) Use of the embedding mass according to claim 1, for embedding of membranes according to the casting process. ### Claim 21 (depends on 20) Use of the embedding mass according to claim 20, for the embedding of membranes according to the centrifuge casting process.