US4433128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Embedding mass based upon fast-reacting polyurethane casting resin
Assignee: Akzo NV
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Filing: 1982-11-22
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Granted: 1984-02-21
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Expires: 2002-11-22
Abstract
Abstract Embedding masses are disclosed on the basis of fast-reacting polyurethane casting resins, which are obtained through reaction of an aromatic polyisocyanate with a mixture of castor oil and trimethylolpropane into an NCO-group-displaying pre-adduct and polymerization of this pre-adduct with a polypropyleneglycol or a mixture of polypropyleneglycol and trimethylolpropane in the presence of small amounts of a catalyst mixture composed of dialkyl tin dicarboxylate and tertiary amine. The polyurethane casting resins can harden in seconds-fast reaction, and are therefore preferably suitable for a continuous embedding of membranes in automatic machines, particularly of membranes for artificial organs.
Inventors
- 👤 Gerhard Wick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8051; B; B01; B01D; B01D63/00; B01D63/02; B01D63/021; B01D63/022; B01D63/023; C08G18/08; C08G18/16; C08G18/161; C08G18/163; C08G18/165; C08G18/28; C08G18/40; C08G18/48; C08G18/4825; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/6677
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
113 words
Embedding mass based upon polyurethanes produced from castor oil, comprising a polyurethane, which has been obtained through reaction of an aromatic polyisocyanate with a mixture of castor oil and trimethylolpropane to produce an NCO-group-displaying pre-adduct and polymerization of the pre-adduct with a polypropyleneglycol or a mixture of polypropyleneglycol and trimethylolpropane in the presence of catalyst, said embedding mass containing as catalyst about 0.005 up to 0.3% by weight, relative to the total weight of the polyurethane resin, of a mixture of a dialkyl tin dicarboxylate and a tertiary aliphatic mono- or diamine in weight ratio 1:1 up to 4:1, said employed polypropylene glycol being constructed of 25 up to 50 propylene oxide units.
Claim 2
Dependent Claim
113 words
Embedding mass based upon polyurethanes produced from castor oil, comprising a polyurethane, which has been obtained through reaction of an aromatic polyisocyanate with a mixture of castor oil and trimethylolpropane to produce an NCO-group-displaying pre-adduct and polymerization of the pre-adduct with a polypropyleneglycol or a mixture of polypropyleneglycol and trimethylolpropane in the presence of catalyst, said embedding mass containing as catalyst about 0.005 up to 0.3% by weight, relative to the total weight of the polyurethane resin, of a mixture of a dialkyl tin dicarboxylate and a tertiary aliphatic mono- or diamine in weight ratio 1:1 up to 4:1, said employed polypropylene glycol being constructed of 25 up to 50 propylene oxide units.
Claim 3
Dependent Claim
31 words
Embedding mass according to claim 1, wherein the catalyst mixture contains as dialkyl tin dicarboxylate, dibutyl tin diacetate, dibutyl tin dilaurate, dibutyl tin dioctoate, dibutyl tin dinonanoate or dioctyl tin dilaurate.
Claim 4
Dependent Claim
32 words
Embedding mass according to claim 1, wherein the catalyst mixture contains as tertiary aliphatic mono- or diamine, trimethylamine, ethyldimethylamine, diethylmethylamine, triethylamine, N,N-dimethyl-2-phenylethylamine, N,N,N',N'-tetramethylmethanediamine, N,N,N',N'-tetramethylbutane-1,3-diamine, N-methylmorpholine, N,N-dimethylcyclohexylamine, N,N-diethylcyclohexylamine, 1,4-diazabicyclo(2,2,2)-octane, 1,8-diazabicyclo(5,4,0)-undecene-(7), 1,2,4-trimethylpiperazine or dimethylaminoethylpiperazine.
Claim 5
Dependent Claim
29 words
Embedding mass according to claim 1, wherein in the catalyst mixture, dialkyl tin dicarboxylate and tertiary aliphatic mono- or diamine are employed in weight ratio 2:1 up to 3.5:1.
Claim 6
Dependent Claim
30 words
Embedding mass according to claim 1, wherein the catalyst mixture is provided in amounts of 0.02 up to 0.15% by weight, relative to the total weight of the polyurethane resin.
Claim 7
Dependent Claim
19 words
Embedding mass according to claim 1, wherein the polypropyleneglycol is constructed from 33 up to 44 propylene oxide units.
Claim 8
Dependent Claim
101 words
Process for the production of an embedding mass of polyurethane, comprising reacting an aromatic polyisocyanate with a mixture of castor oil and trimethylolpropane to produce an NCO-group-displaying pre-adduct and polymerizing said pre-adduct with a polypropyleneglycol or a mixture of polypropyleneglycol and trimethylolpropane, in the presence of catalyst, using as catalyst 0.005 to 0.3% by weight, relative to the total weight of the polyurethane resin, of a mixture of a dialkyl tin dicarboxylate and a tertiary aliphatic mono- or diamine in weight ratio 1:1 up to 4:1, and using as polypropyleneglycol a product constructed from 25 up to 50 propylene oxide units.
Claim 9
Dependent Claim
101 words
Process for the production of an embedding mass of polyurethane, comprising reacting an aromatic polyisocyanate with a mixture of castor oil and trimethylolpropane to produce an NCO-group-displaying pre-adduct and polymerizing said pre-adduct with a polypropyleneglycol or a mixture of polypropyleneglycol and trimethylolpropane, in the presence of catalyst, using as catalyst 0.005 to 0.3% by weight, relative to the total weight of the polyurethane resin, of a mixture of a dialkyl tin dicarboxylate and a tertiary aliphatic mono- or diamine in weight ratio 1:1 up to 4:1, and using as polypropyleneglycol a product constructed from 25 up to 50 propylene oxide units.
Claim 10
Dependent Claim
30 words
Process according to claim 7, using as dialkyl tin dicarboxylate in the catalyst mixture, dibutyl tin diacetate, dibutyl tin dilaurate, dibutyl tin dioctoate, dibutyl tin dinonanoate or dioctyl tin dilaurate.
Claim 11
Dependent Claim
32 words
Process according to claim 7, using as tertiary aliphatic mono- or diamine in the catalyst mixture, trimethylamine, ethyldimethylamine, diethylmethylamine, triethylamine, N,N-dimethyl-2-phenylethylamine, N,N,N',N'-tetramethylmethane diamine, N,N,N',N'-tetramethylbutane-1,3-diamine, N-methylmorpholine, N,N-dimethylcyclohexylamine, N,N-diethylcyclohexylamine, 1,4-diazabicyclo(2,2,2)-octane, 1,8-diazabicyclo(5,4,0)-undecene-(7), 1,2,4-trimethylpiperazine or dimethylaminoethylpiperazine.
Claim 12
Dependent Claim
21 words
Process according to claim 7, wherein dialkyl tin compound and tertiary alkylamine are mixed in weight ratio 2:1 up to 3.5:1.
Claim 13
Dependent Claim
29 words
Process according to claim 7, wherein said catalyst mixture is employed in amounts from 0.02 up to 0.15% by weight, relative to the total weight of the polyurethane resin.
Claim 14
Dependent Claim
26 words
Process according to claim 7, wherein for polymerization of the pre-adduct, a polypropyleneglycol is used which is constructed from 33 up to 44 propylene oxide units.
Claim 15
Dependent Claim
17 words
Process according to claim 7, wherein the hardening of the embedding mass is performed at room temperature.
Claim 16
Dependent Claim
56 words
In a process of embedding of membranes in the form of hollow filaments, tube foils or flat foils for construction of separatory arrangements of the type in which an embedding mass is distributed about the membranes to be embedded and then hardened, the improvement wherein employing an embedding mass based upon polyurethanes according to claim 1.
Claim 17
Dependent Claim
11 words
Improved process according to claim 14, for construction of artificial organs.
Claim 18
Dependent Claim
12 words
Improved process according to claim 14, for construction of selectively working dialysators.
Claim 19
Dependent Claim
12 words
Improved process according to claim 16, for construction of selectively working hemodialysators.
Claim 20
Dependent Claim
20 words
Improved process according to claim 14, wherein said embedding mass is distributed about the membranes and then hardened by casting.
Claim 21
Dependent Claim
21 words
Improved process according to claim 18, wherein said embedding mass is distributed about the membranes and then hardened by centrifuge casting.
Claim 22
Dependent Claim
15 words
Improved process according to claim 18, for continuous embedding of membranes by automatic casting machines.
References Cited (Backward Citations)
GB1375032A
Cited
US4272377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |