US3718622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gel prevention in polyurethanes
Assignee: Ruco Polymer Corp
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Filing: 1970-12-31
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Granted: 1973-02-27
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Expires: 1990-12-31
Abstract
Abstract The formation of gel particles in bulk polymerized thermoplastic polyurethanes is greatly reduced by employing a high molecular weight monofunctional compound having a hydroxyl group in the reaction mixture of an organic compound containing groups reactive with isocyanato groups and an organic polyisocyanate. The polyurethanes can be employed in applications such as the preparation of films, sheets, pipe, and coatings, either alone or in blends with other plastics such as polyvinylchloride, and the like.
Inventors
- 👤 L Camilleri
- 👤 M Huebner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:44
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/2815; C08G18/284; C08G18/282; C08G18/2825; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
The composition of claim 1 wherein said saturated mono-ester has a molecular weight of about 130 to about 350.
Claim 2
Dependent Claim
15 words
The composition of claim 2 wherein said saturated mono-ester is the mono-isobutyrate ester of 2,2,4-trimethylpentanediol.
Claim 3
Independent Claim
98 words
A method of reducing gel content in bulk polymerized thermoplastic polyurethanes which comprises reacting a mixture comprising (1) an organic diisocyanate and (2) an organic compound having two functional groups reactive with isocyanato groups selected from the group consisting of at least one of dihydric alcohols, dihydroxy polyesters, polyester amides, dihydric polyalkylene ethers, and dihydric polythioethers, in the presence of an effective gel particle reducing amount of a saturated mono-ester of an aliphatic carboxylic acid of two to about 18 carbon atoms, said saturated mono-ester containing a primary or secondary hydroxyl group and eight to 22 carbon atoms.
Claim 4
Dependent Claim
19 words
The method of claim 5 wherein said saturated mono-ester has a molecular weight of about 130 to about 350.
Claim 5
Dependent Claim
24 words
The method of claim 5 wherein said saturated mono-ester comprises about 0.25 to about 5 weight percent of the total weight of the mixture.
Claim 6
Dependent Claim
36 words
The method of claim 4 wherein said saturated mono-ester has a molecular weight of about 200 to about 300 and comprises about 1.0 to about 3.0 weight percent of on the total weight of the mixture.
Claim 7
Dependent Claim
15 words
The method of claim 7 wherein said saturated mono-ester is the mono-isobutyrate ester of 2,2,4-trimethylpentanediol.
Claim 8
Dependent Claim
75 words
The composition of claim 2 wherein said saturated mono-ester has a molecular weight of about 200 to about 300 and is present in the proportion of 1 to about 3 weight percent based upon the weight of the composition, wherein said carboxylic acid is selected from the group consisting of butyric acid, caproic acid, and formic acid, and wherein said hydroxyl-containing compound is selected from the group consisting of propylene glycol, 1,2-butanediol, 1,3-butanediol, and pentanediol.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |