US4956439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance modified polyurethanes
Assignee: Individual
•
Filing: 1989-09-08
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Granted: 1990-09-11
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Expires: 2009-09-08
Abstract
Abstract Modified polyurethane products, exhibiting good physical strength and excellent heat resistance, and especially improved heat sag properties, are prepared by blending a polyol component containing at least 1% of at least one polynuclear aromatic polyol or a derivative thereof, or a mononuclear diol or a derivative thereof, at a temperature of 100°-180° C., to form a first liquid component; admixing the first liquid component with a second liquid component containing a diisocyanate or polyisocyanate, one of the two liquid components containing a catalyst; and reacting and molding the admixture in a mold kept at a temperature of from 80°-140° C. by reaction injection molding.
Inventors
- 👤 Shen-Nan Tong
- 👤 Shih-Jung Tsai
- 👤 Jyi-Shang Lii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:04
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3863; C08G18/3865; C08G18/3872; C08G18/32; C08G18/3203; C08G18/3215; C08G18/3221; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G2120/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A method for molding a heat resistant modified polyurethane, which comprises: blending a polyol component containing at least 1% of at least one room temperature solid or semi-solid state polynuclear aromatic polyol or a derivative thereof, or mononuclear diol or a derivative thereof, at a temperature of from 100 to 180° C., so as to form a heated first liquid component; admixing said heated first liquid component with a second liquid component containing a diisocyanate or a polyisocyanate, one of said components containing a catalyst; and reacting and molding said admixture of the first and second liquid components in a mold maintained at a temperature of from 80° to 140° C.
Claim 2
Independent Claim
111 words
A method for molding a heat resistant modified polyurethane, which comprises: blending a polyol component containing at least 1% of at least one room temperature solid or semi-solid state polynuclear aromatic polyol or a derivative thereof, or mononuclear diol or a derivative thereof, at a temperature of from 100 to 180° C., so as to form a heated first liquid component; admixing said heated first liquid component with a second liquid component containing a diisocyanate or a polyisocyanate, one of said components containing a catalyst; and reacting and molding said admixture of the first and second liquid components in a mold maintained at a temperature of from 80° to 140° C.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the mononuclear diol or derivative thereof has the formula ##STR1##
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein the polynuclear polyol or derivative thereof has the formula ##STR2## where R 1 =C 0 -C 4 alkylene, ##STR3## R 2 =C 0 -C 6 alkyl, X=H or halogen.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein the polyol component contains from 1 to 100% of the polynuclear aromatic polyol or derivative thereof, or mononuclear diol or derivative thereof.
Claim 6
Dependent Claim
32 words
The method of claim 1 wherein from 0.1 to 2.0 pph of the catalyst is present, and said catalyst is 1,4-diazo[2.2.2]bicyclo-octane, dibutyltin dilaurate, a tertiary amine, metal carboxylate or a combination thereof.
Claim 7
Dependent Claim
39 words
The method of claim 5 wherein the catalyst is a mixture of 1,4-diazo[2.2.2]bicyclo-ocatane and dibutyltin dilaurate, and the amount of 1,4-diazo[2.2.2]bicyclo-octane is from 0.1 to 2.0 pph and the amount of dibutyltin dilaurate is from 0.1 to 2.0 pph.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein the reaction medium also contains reinforcing materials.
Claim 9
Dependent Claim
17 words
The method of claim 7 wherein the reinforcing material is fiber glass, carbon fiber or Kelvar fiber.
Claim 10
Dependent Claim
9 words
The product prepared by the method of claim 1.
References Cited (Backward Citations)
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Cited
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US4254069A
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US4272618A
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US4314962A
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |