US4487910A
Expired / Lapsed
US
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Process for polyurethane prepolymers containing terminal isocyanate groups and having a reduced residual monomer content
Assignee: Henkel AG and Co KGaA
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Filing: 1984-02-09
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Granted: 1984-12-11
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Expires: 2004-02-09
Abstract
Abstract Process for the production of polyurethane prepolymers based on monocyclic and dicyclic diisocyanates, in which a prepolymer based on a dicyclic diisocyanate is produced in a prepolymer based on a monocyclic diisocyanate of comparatively lower reactivity. The products obtained by this process contain terminal isocyanate groups and are distinguished by a reduced content of free monomeric diisocyanates.
Inventors
- 👤 Hans Bauriedel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:28
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/70; C08G18/72; C08G18/721; C08G18/722; C08G18/74; C08G18/76; C08G18/7607; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
75 words
A process for the preparation of a polyurethane prepolymer containing terminal isocyanate groups from both monocyclic and dicyclic diisocyanates comprising the steps of a. reacting a monocyclic diisocyanate with a polyhydric alcohol in an OH:NCO ratio of less than 1 to form a prepolymer; and b. reacting a dicyclic diisocyanate with a polyhydric alcohol in an OH:NCO ratio of less than 1, wherein the reaction is carried out in the prepolymer prepared in step a.
Claim 2
Dependent Claim
75 words
A process for the preparation of a polyurethane prepolymer containing terminal isocyanate groups from both monocyclic and dicyclic diisocyanates comprising the steps of a. reacting a monocyclic diisocyanate with a polyhydric alcohol in an OH:NCO ratio of less than 1 to form a prepolymer; and b. reacting a dicyclic diisocyanate with a polyhydric alcohol in an OH:NCO ratio of less than 1, wherein the reaction is carried out in the prepolymer prepared in step a.
Claim 3
Dependent Claim
22 words
A process in accordance with claim 1 wherein the monocyclic diisocyanate is tolylene diisocyanate, isophorone diisocyanate, or a mixture of the foregoing.
Claim 4
Dependent Claim
24 words
A process in accordance with claim 1 wherein the dicyclic diisocyanate is 4,4'-diphenyl methane diisocyanate, 4,4'-dicyclohexyl methane diisocyanate, or a mixture of the foregoing.
Claim 5
Dependent Claim
24 words
A process in accordance with claim 2 wherein the dicyclic diisocyanate is 4,4'-diphenyl methane diisocyanate, 4,4'-dicyclohexyl methane diisocyanate, or a mixture of the foregoing.
Claim 6
Dependent Claim
21 words
A process in accordance with claim 1 wherein in step a. the OH:NCO ratio is between about 0.4 and about 0.8.
Claim 7
Dependent Claim
21 words
A process in accordance with claim 5 wherein the OH:NCO ratio in step a. is between about 0.5 and about 0.7.
Claim 8
Dependent Claim
21 words
A process in accordance with claim 1 wherein in step b. the OH:NCO ratio is between about 0.65 and about 0.80.
Claim 9
Dependent Claim
21 words
A process in accordance with claim 7 wherein the OH:NCO ratio in step b. is between about 0.70 and about 0.75.
Claim 10
Dependent Claim
21 words
A process in accordance with claim 5 wherein in step b. the OH:NCO ratio is between about 0.65 and about 0.80.
Claim 11
Dependent Claim
29 words
A process in accordance with claim 1 wherein the polyhydric alcohols in steps a. and b. are primary or secondary aliphatic alcohols containing from 2 to 6 hydroxyl groups.
Claim 12
Dependent Claim
17 words
A process in accordance with claim 10 wherein the alcohols contain from 2 to 4 hydroxyl groups.
Claim 13
Dependent Claim
49 words
a process in accordance with claim 10 wherein the alcohols are diols containing from 2 to 5 carbon atoms, triols containing from 3 to 6 carbon atoms, tetraols containing from 4 to 8 carbon atoms, or --OH functional polyesters having molecular weights of from about 200 to about 10,000.
Claim 14
Dependent Claim
40 words
A process in accordance with claim 1 wherein the dicyclic diisocyanate employed in step b. is employed in a quantity of from about 5 to about 80% by weight, based on the total quantity of diisocyanates employed in the process.
Claim 15
Dependent Claim
32 words
A process in accordance with claim 1 wherein step a. and step b. are each carried out at a temperature in the range of from about 50° C. to about 100° C.
Claim 16
Dependent Claim
23 words
A process in accordance with claim 14 wherein said temperature is in the range of from about 60° C. to about 80° C.
Claim 17
Dependent Claim
24 words
A process in accordance with claim 10 wherein said alcohols are polyether polyols having a molecular weight of from about 100 to about 5000.
Claim 18
Dependent Claim
16 words
A process in accordance with claim 16 wherein the polyether polyols are polyoxyethylene or polyoxypropylene polyols.
Claim 19
Dependent Claim
12 words
A polyurethane prepolymer prepared in accordance with the process of claim 1.
Claim 20
Dependent Claim
48 words
A method for bonding plastic materials together comprising contacting the plastic materials to be bonded together with the polyurethane prepolymer prepared by the process of claim 1 in the presence of moisture or a hardener composition or both and joining the plastic materials together until bonding is achieved.
Claim 21
Dependent Claim
27 words
A method in accordance with claim 19 wherein the bonding is carried out at a temperature in the range of from about 70° to about 120° C.
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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |