Patent US4916173A successfully refreshed from Google Patents.
US4916173A
Expired / Lapsed
US
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Polyurethane syntactic foam modeling stock
Assignee: Huntsman Advanced Materials Americas LLC
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Filing: 1988-05-06
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Granted: 1990-04-10
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Expires: 2008-05-06
Abstract
Abstract Polyurethane syntactic foam compositions having high glass transition temperatures and low coefficients of thermal expansion suitable for use in tooling applications as modeling stock are prepared from polymeric isocyanate, an amine-based polyol, a polyether triol, molecular sieve material and hollow microspheres.
Inventors
- 👤 Elizabeth L. Otloski
- 👤 George H. Sollner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:56
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/088; C08G18/0885; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/482; C08G18/50; C08G18/5021; C08K; C08K3/00; C08K3/01; C08K3/013; C08K3/34; C08K7/00; C08K7/22; C08K7/24; C08K7/28; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
55 words
A curable polyurethane composition consisting essentially of a blend of (a) from 30-55% of a polyisocyanate, (b) from 9-35% of an amine-based polyol, (c) from 5-40% of a polyether triol, (d) from 3-10% of a molecular sieve and (e) from 10-40% of a hollow microsphere filler, all percentages being by weight of the total composition.
Claim 2
Dependent Claim
55 words
A curable polyurethane composition consisting essentially of a blend of (a) from 30-55% of a polyisocyanate, (b) from 9-35% of an amine-based polyol, (c) from 5-40% of a polyether triol, (d) from 3-10% of a molecular sieve and (e) from 10-40% of a hollow microsphere filler, all percentages being by weight of the total composition.
Claim 3
Dependent Claim
42 words
The composition of claim 1, wherein component (a) is present in a concentration of from 40-45%, component (b) from 15-30%, component (c) from 5-20%, component (d) from 5-8%, and component (e) from 10-20%, all percentages being by weight of the total composition.
Claim 4
Dependent Claim
13 words
The composition of claim 1, wherein component (a) is a polymethylene polyphenyl isocyanate.
Claim 5
Dependent Claim
12 words
The composition of claim 1, wherein component (b) is an amine-based triol.
Claim 6
Dependent Claim
19 words
The composition of claim 1, wherein component (e) is hollow glass microspheres having a diameter of from 5-250 micrometers.
Claim 7
Dependent Claim
17 words
A shaped article consisting essentially of the polyurethane composition of claim 1 subsequent to the curing thereof.
Claim 8
Dependent Claim
42 words
The article of claim 6, wherein component (a) is present in a concentration of from 40-45%, component (b) from 15-30%, component (c) from 5-20%, component (d) from 5-8% and component (e) from 10-20%, all percentages being by weight of the total composition.
Claim 9
Dependent Claim
44 words
The article of claim 6 having a glass transition temperature over 100° C. coupled with a coefficient of thermal linear expansion of less than 70×10 -6 in/in/°C. in the -30°-30° C. range and of less than 80×10 -6 in/in/°C. in the 25°-100° C. range.
Claim 10
Dependent Claim
44 words
The article of claim 8 having a glass transition temperature over 125° C. coupled with a coefficient of thermal linear expansion of less than 50×10 -6 in/in/°C. in the -30°-30° C. range and of less than 60×10 -6 in/in/°C. in the 25°-100° C. range.
Claim 11
Dependent Claim
13 words
The article of claim 6, wherein component (a) is a polymethylene polyphenyl isocyanate.
Claim 12
Dependent Claim
12 words
The article of claim 6, wherein component (b) is an amine-based triol.
Claim 13
Dependent Claim
16 words
The article of claim 6, wherein component (b) is derived from an aliphatic or aromatic diamine.
Claim 14
Dependent Claim
24 words
The article of claim 6, wherein component (c) is an aliphatic alkylene glycol polymer having an alkylene unit of at least two carbon atoms.
Claim 15
Dependent Claim
19 words
The article of claim 6, wherein component (e) is hollow glass microspheres having a diameter of from 5-20 micrometers.
Claim 16
Dependent Claim
36 words
The article of claim 14, which also contains at least one other filler selected from the group consisting of calcium carbonate, mica, glass fibers, silica-alumina ceramic alloy, hydrated alumina silicate, calcium sulfate, talc and solid microspheres.
Claim 17
Dependent Claim
23 words
The article of claim 15, wherein said at least one other filler replaces up to 85%, by weight, of the hollow microsphere content.
Claim 18
Dependent Claim
109 words
The article of claim 6 having a glass transition temperature over 125° C. coupled with a coefficient of thermal linear expansion of less than 50×10 -6 in/in/°C. in the -30°-30° C. range and of less than 60×10 -6 in/in/°C. in the 25°-100° C. range and comprising the cured product of (a) from about 40-45%, by weight, of a polymethylene polyphenyl isocyanate, (b) from about 20-25%, by weight, of an amined-based triol, (c) from about 10-15%, by weight, of a polyether triol, (d) from about 5-8%, by weight, of a molecular sieve and (e) from about 10-20% by weight, of hollow glass microspheres having a diameter of from 5-250 micrometers.
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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) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |