US4550126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic, flexible, open cell polyurethane-poly(N-vinyl lactam) interpolymer foam and dental and biomedical products fabricated therefrom
Assignee: Hydromer Inc
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Filing: 1985-01-25
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Granted: 1985-10-29
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Expires: 2005-01-25
Abstract
Abstract A hydrophilic, flexible, open cell polyurethane-poly(N-vinyl lactam) interpolymer foam is obtained from the process which comprises reacting under interpolymer and foam-forming conditions (a) a substantially linear isocyanate-capped polyether polyol prepolymer having an average reactive functionality of less that about 2.0 with (b) a poly(N-vinyl lactam) and (c) a foam-forming amount of water in the presence of (d) a cell formation-regulating amount of surface active agent. The foams exhibit unexpectedly higher levels of absorptivity for aqueous fluids compared to those of known crosslinked foams. The foams herein are especially useful for the manufacture of a variety of dental and biomedical products including surgical bandages and dressings, laparotomy sponges, medicament carriers, and the like, where the capability for absorbing body fluids is an important performance criterion.
Inventors
- 👤 Donald H. Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:28
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6283; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61L15/42; A61L15/425; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
63 words
A hydrophilic, flexible, open cell polyurethanepolyvinylpyrrolidone interpolymer foam obtained from the process which comprises reacting under interpolymer and foam-forming conditions (a) a substantially linear isocyanate-capped polyether polyol prepolymer having an average reactive functionality of less than about 2.0 with (b) a poly(N-vinyl lactam) and (c) a foam-forming amount of water in the presence of (d) a cell formation-regulating amount of surface active agent.
Claim 2
Dependent Claim
63 words
A hydrophilic, flexible, open cell polyurethanepolyvinylpyrrolidone interpolymer foam obtained from the process which comprises reacting under interpolymer and foam-forming conditions (a) a substantially linear isocyanate-capped polyether polyol prepolymer having an average reactive functionality of less than about 2.0 with (b) a poly(N-vinyl lactam) and (c) a foam-forming amount of water in the presence of (d) a cell formation-regulating amount of surface active agent.
Claim 3
Dependent Claim
21 words
The foam of claim 1 in which the prepolymer has an average reactive functionality of from about 1.3 to about 1.9.
Claim 4
Dependent Claim
21 words
The foam of claim 1 in which the prepolymer has an average reactive functionality of from about 1.5 to about 1.8.
Claim 5
Dependent Claim
38 words
The foam of claim 1 in which the prepolymer is prepared with a substantially linear polyether polyol derived from a difunctional, active hydrogen-containing initiator and one or more 1,2-epoxides which will impart hydrophilic properties to the resulting polyol.
Claim 6
Dependent Claim
24 words
The foam of claim 1 in which the prepolymer is prepared with a substantially linear polyether polyol derived from ethylene glycol and ethylene oxide.
Claim 7
Dependent Claim
68 words
The foam of claim 1 in which the prepolymer is prepared with a substantially linear polyether polyol of the general formula H(OCH 2 CH 2 ) m OCH 2 CH 2 O(CH 2 CH 2 O) n H wherein m and n each is an integer of from 2 to about 250 and m and n taken together is an integer of from about 3 to about 500.
Claim 8
Dependent Claim
36 words
The foam of claim 6 in which m and n is an integer of from about 5 to about 80 and m and n taken together is an integer of from about 20 to about 200.
Claim 9
Dependent Claim
21 words
The foam of claim 6 in which the average molecular weight of the polyol is from about 200 to about 20,000.
Claim 10
Dependent Claim
21 words
The foam of claim 6 in which the average molecular weight of the polyol is from about 800 to about 10,000.
Claim 11
Dependent Claim
15 words
The foam of claim 1 in which the prepolymer is prepared with a toluene diisocyanate.
Claim 12
Dependent Claim
21 words
The foam of claim 1 in which from about 6.5 to about 400 moles of water are reacted with the prepolymer.
Claim 13
Dependent Claim
21 words
The foam of claim 1 in which from about 20 to about 200 moles of water are reacted with the prepolymer.
Claim 14
Dependent Claim
13 words
The foam of claim 1 in which the poly(N-vinyl lactam) is a polyvinylpyrrolidone.
Claim 15
Dependent Claim
19 words
The foam of claim 1 in which the poly(N-vinyl lactam) is a polyvinylpyrrolidone having a K-value of about 85.
Claim 16
Dependent Claim
17 words
The foam of claim 1 in which the surface active agent is a non-ionic surface active agent.
Claim 17
Dependent Claim
21 words
The foam of claim 1 prepared with from about 0.5 to about 5.0 percent surface active agent by weight of prepolymer.
Claim 18
Dependent Claim
21 words
The foam of claim 1 prepared with from about 1.0 to about 2.0 percent surface active agent by weight of prepolymer.
Claim 19
Dependent Claim
13 words
The foam of claim 1 containing a drug, bio-effecting or body treating ingredient.
Claim 20
Dependent Claim
13 words
The foam of claim 1 containing bioavailable iodine complexed with the interpolymerized poly(N-vinyllactam).
Claim 21
Dependent Claim
13 words
The foam of claim 13 containing bioavailable iodine complexed with the interpolymerized polyvinylpyrrolidone.
Claim 22
Dependent Claim
12 words
An athlete's foot treatment article prepared with the foam of claim 1.
Claim 23
Dependent Claim
12 words
An athlete's foot treatment articles prepared with the foam of claim 19.
Claim 24
Dependent Claim
12 words
An athlete's foot treatment article prepared with the foam of claim 20.
Claim 25
Dependent Claim
12 words
A surgical dressing or bandage prepared with the foam of claim 1.
Claim 26
Dependent Claim
11 words
A vaginitis treatment articles prepared with the foam of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |