US4312946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation and use of enzymes bound to polyurethane
Assignee: Hampshire Chemical Corp
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Filing: 1973-05-21
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Granted: 1982-01-26
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Expires: 1993-05-21
Abstract
Abstract To chemically bind either impure or purified enzymes to polyurethane to produce insolubilized bound enzymes which are still enzymically active and which may be more stable than the original enzyme, and which can be reused without appreciable activity loss and whose physical characteristics can be varied depending on the application for which they are intended.
Inventors
- 👤 Louis L. Wood
- 👤 Frank J. Hartdegen
- 👤 Peter A. Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:45
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; A; A01; A01C; A01C1/00; A01C1/04; A01C1/044; A01C1/046; A01G; A01G24/00; A01G24/40; A01G24/48; B; B29; B29C; B29C44/00; B29C44/20; B29C44/32; B29C44/326; B29C44/34; B29C44/56; B29C44/5627; B29C44/5654; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C12; C12N; C12N11/00; C12N11/02; C12N11/08; C12N11/089; C12N11/093; C12N11/098; C12P; C12P19/00; C12P19/20; C12P37/00; C12P37/06; C08G2110/00; C08G2110/0083; C08G2310/00; C08J2375/00; C08J2375/04; C08J2375/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
45 words
The method of preparing a bound enzyme that includes contacting, prior to a subsequent foaming step, an isocyanate-capped polyurethane with an aqueous dispersion of an enzyme, under foam-forming conditions, whereby the polyurethane foams and the enzyme becomes integrally bound to the thus formed polyurethane foam.
Claim 2
Independent Claim
45 words
The method of preparing a bound enzyme that includes contacting, prior to a subsequent foaming step, an isocyanate-capped polyurethane with an aqueous dispersion of an enzyme, under foam-forming conditions, whereby the polyurethane foams and the enzyme becomes integrally bound to the thus formed polyurethane foam.
Claim 3
Dependent Claim
25 words
The method according to claim 1 in which the resulting polyurethane foam is washed to remove unbound enzymes and to hydrolyze any unreacted isocyanate groups.
Claim 4
Dependent Claim
45 words
The method according to claim 1 in which the isocyanate-capped polyurethane is the reaction product of toluene diisocyanate with a polyhydroxy compound of the group consisting of polyoxybutylene polyol polymer, ethylene glycol, diethylene glycol, polyoxyethylene polyol polymer, pentaerythritol, glycerol, trimethylol propane and polyoxypropylene polyol polymer.
Claim 5
Dependent Claim
15 words
The method according to claim 3 in which the group member is polyoxythylene polyol polymer.
Claim 6
Dependent Claim
29 words
The method according to claim 1 in which the enzyme is selected from the group consisting of urease, cellulase, pectinase, papain, bromelain, chymotrypsin, trypsin, ficin, lysozyme, and glucose isomerase.
Claim 7
Dependent Claim
77 words
An enzyme-containing foam comprising: about 0.33-11.1 percent by weight of an active enzyme preparation on an anhydrous solids basis, and a hydrophilic poly(urea-urethane) foam matrix having an oxyalkylene backbone containing a mixture of oxyalkylene units at least some of which are oxyethylene; said hydrophilic foam being formed by reacting an isocyanate-terminated prepolymer containing an aqueous solution of said enzyme with water, and said hydrophilic foam entrapping and supporting said enzyme in an active configuration for enzymatic activity.
Claim 8
Dependent Claim
77 words
An enzyme-containing foam comprising: about 0.33-11.1 percent by weight of an active enzyme preparation on an anhydrous solids basis, and a hydrophilic poly(urea-urethane) foam matrix having an oxyalkylene backbone containing a mixture of oxyalkylene units at least some of which are oxyethylene; said hydrophilic foam being formed by reacting an isocyanate-terminated prepolymer containing an aqueous solution of said enzyme with water, and said hydrophilic foam entrapping and supporting said enzyme in an active configuration for enzymatic activity.
Claim 9
Dependent Claim
64 words
An enzyme-containing foam comprising: about 0.33-11.1 percent by weight of an active enzyme preparation on an anhydrous solids basis, and a hydrophilic poly(urea-urethane) foam matrix having an oxyethylene backbone; said hydrophilic foam being formed by reacting an isocyanate-terminated prepolymer containing an aqueous solution of said enzyme with water, and said hydrophilic foam entrapping and supporting said enzyme in an active configuration for enzymatic activity.
Claim 10
Dependent Claim
64 words
An enzyme-containing foam comprising: about 0.33-11.1 percent by weight of an active enzyme preparation on an anhydrous solids basis, and a hydrophilic poly(urea-urethane) foam matrix having an oxyethylene backbone; said hydrophilic foam being formed by reacting an isocyanate-terminated prepolymer containing an aqueous solution of said enzyme with water, and said hydrophilic foam entrapping and supporting said enzyme in an active configuration for enzymatic activity.
Claim 11
Dependent Claim
74 words
An enzyme-containing foam comprising: about 0.33-11.1 percent by weight of an active enzyme preparation on an anhydrous solids basis, and a hydrophilic poly(urea-urethane) foam matrix having an oxyalkylene backbone containing oxyalkylene units at least some of which are oxyethylene; said hydrophilic foam being formed by reacting an isocyanate-terminated prepolymer containing an aqueous solution of said enzyme with water, and said hydrophilic foam entrapping and supporting said enzyme in an active configuration for enzymatic activity.
Claim 12
Dependent Claim
74 words
An enzyme-containing foam comprising: about 0.33-11.1 percent by weight of an active enzyme preparation on an anhydrous solids basis, and a hydrophilic poly(urea-urethane) foam matrix having an oxyalkylene backbone containing oxyalkylene units at least some of which are oxyethylene; said hydrophilic foam being formed by reacting an isocyanate-terminated prepolymer containing an aqueous solution of said enzyme with water, and said hydrophilic foam entrapping and supporting said enzyme in an active configuration for enzymatic activity.
Claim 13
Dependent Claim
51 words
A process for forming an active enzyme foam comprising the steps of: combining an aqueous solution of enzyme and a hydrophilic isocyanate-terminated polyoxyalkylene prepolymer, said prepolymer containing at least some oxyethylene units; and reacting the enzyme-containing isocyanate-terminated prepolymer with water to form a foam containing said enzyme in an active configuration.
Claim 14
Dependent Claim
51 words
A process for forming an active enzyme foam comprising the steps of: combining an aqueous solution of enzyme and a hydrophilic isocyanate-terminated polyoxyalkylene prepolymer, said prepolymer containing at least some oxyethylene units; and reacting the enzyme-containing isocyanate-terminated prepolymer with water to form a foam containing said enzyme in an active configuration.
Claim 15
Dependent Claim
17 words
The process according to claim 9 wherein said reaction is carried out at 4° to 25° C.
Claim 16
Dependent Claim
8 words
The enzyme foam of claim 6 containing filler.
Claim 17
Dependent Claim
19 words
The process according to claim 9 where said isocyanate-terminated prepolymer has a molecular weight from about 774 to 1348.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |