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US3666835A
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Polyurethane systems
Assignee: Sun Chemical Corp
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Filing: 1970-04-16
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Granted: 1972-05-30
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Expires: 1990-04-16
Abstract
Abstract Solvent-free polyurethane systems particularly useful as textile laminating adhesives comprise a hydroxyl-terminated urethane prepolymer and an isocyanate-terminated urethane prepolymer.
Inventors
- 👤 Hans R Schloss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:19
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C09J175/08; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; Y; Y10; Y10S; Y10S528/00; Y10S528/904; Y10S528/905
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
28 words
The polyurethane composition of claim 1 wherein the ratio of prepolymer (B) to prepolymer (A) is about 10 to 60 parts of (B) to 100 parts of (A).
Claim 2
Dependent Claim
23 words
The composition of claim 1 wherein the prepolymer (A) is further reacted with (d) a polyol having a functionality of at least 3.
Claim 3
Dependent Claim
67 words
The polyurethane composition of claim 3 wherein the prepolymer (A) contains up to about 8 equivalents of glycol (c) and about 0.05 to 1 equivalent of polyol (d) per equivalent of polyol (a) and sufficient isocyanate (b) to give final NCO/OH ratio of about 0.88-0.97 and the prepolymer (B) contains about 3-6 parts of glycol (f), 4-40 parts of polyol (g), and 20-60 parts of isocyanate (h).
Claim 4
Dependent Claim
51 words
The polyurethane composition of claim 3 wherein the prepolymer (A) contains about 1.5-2.5 equivalents of glycol (c) and about 0.15-0.35 equivalent of polyol (d) per equivalent of polyol (a) and the prepolymer (B) contains about 3-5 parts of glycol (f), 10-15 parts of polyol (g), and 40-60 parts of isocyanate (h).
Claim 5
Dependent Claim
35 words
The polyurethane composition of claim 3 wherein the isocyanate (b and h) is 2,4-tolylene diisocyanate, the glycol (c) is tetraethylene glycol, the polyol (d and g) is trimethylolpropane, and the glycol (f) is 1,3-butylene glycol.
Claim 6
Dependent Claim
8 words
An adhesive comprising the polyurethane composition of claim
Claim 7
Dependent Claim
10 words
A coating composition comprising the polyurethane composition of claim 1.
Claim 8
Dependent Claim
10 words
The composition of claim 1 which additionally contains a catalyst.
References Cited (Backward Citations)
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |