Patent US4466936A successfully refreshed from Google Patents.
US4466936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of molds using gel compositions with depot action based on a polyurethane matrix and relatively high molecular weight polyols
Assignee: Bayer AG
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Filing: 1983-06-09
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Granted: 1984-08-21
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Expires: 2003-06-09
Abstract
Abstract A polyol gel is made from 15-62 wt. % (based on the sum of polyurethane matrix plus dispersing agent) of a high molecular weight covalently cross-linked polyurethane matrix; 85-38 wt. % (based on the sum of polyurethane matrix plus dispersing agent) of a liquid dispersing agent which is firmly bonded to the matrix; and optionally, active ingredients, fillers, additives, catalysts, and mixtures thereof. The liquid dispersing agent is a polyhydroxyl compound having a molecular weight of between 1,000 and 12,000 and an OH number between 20 and 112. This dispersing agent should have virtually no hydroxyl compounds having a molecular weight below 800 present. These gel compositions may be used to make mold impressions and highly stable active-ingredient releasing compositions.
Inventors
- 👤 Dieter Schapel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:27
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0008; C11D17/003; A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A23; A23L; A23L27/00; A23L27/70; A23L27/74; A61; A61K; A61K6/00; A61K6/90; A61K8/00; A61K8/18; A61K8/72; A61K8/84; A61K8/87; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/048; A61Q; A61Q19/00; B; B01; B01J; B01J13/00; B01J13/0052; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08L; C08L75/00; C08L75/04; A61Q15/00; A61Q17/00; A61Q17/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A process for taking an impression of an object in which a gel-forming composition is first poured over the object, the gel-forming composition is permitted to gel, and the object is subsequently removed in which the gel-forming composition comprises: (a) a polyisocyanate; and (b) a polyhydroxyl compound having a molecular weight between 1,000 and 12,000 and an OH number between 20 and 112 said composition being essentially free of hydroxyl compounds having a moleular weight less than 800, having an isocyanate index between 15 and 60 with the product of the isocyanate and hydroxyl functionalities being at least 5.2
Claim 2
Dependent Claim
99 words
A process for taking an impression of an object in which a gel-forming composition is first poured over the object, the gel-forming composition is permitted to gel, and the object is subsequently removed in which the gel-forming composition comprises: (a) a polyisocyanate; and (b) a polyhydroxyl compound having a molecular weight between 1,000 and 12,000 and an OH number between 20 and 112 said composition being essentially free of hydroxyl compounds having a moleular weight less than 800, having an isocyanate index between 15 and 60 with the product of the isocyanate and hydroxyl functionalities being at least 5.2
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the gel-forming composition further comprises a catalyst suitable for an isocyanate polyaddition reaction.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the gel-forming composition further comprises fillers and/or additives.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the gel-forming composition is applied to the object in several layers.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein each of the several layers is of a different composition.
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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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |