US4517331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activating plasticizer for urethane prepolymers and complex of alkali metal salt with 4,4'-methylenedianiline
Assignee: Ashland Inc
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Filing: 1984-03-05
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Granted: 1985-05-14
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Expires: 2004-03-05
Abstract
Abstract Storable polypropylene ether polyurethane compositions composed of (a) a prepolymer of a polypropylene ether glycol and sufficient organic polyisocyanate to give preferably an excess of about 3 to 15 percent NCO in said prepolymer with the proviso that the free NCO is obtained from methylenedi-p-phenyl diisocyanate and (b) a complex of an alkali metal salt with 4,4'-methylenedianiline (MDA), said composition being relatively inactive at temperatures below 100° C., but being heat activatible at much higher temperatures to effect a cure. The improved composition wherein a catalyst is present in said composition which effectively lowers the cure temperature, said catalyst being a pseudocrown ether containing radicals having the formula --y--CH 2 --CH 2 ) n with y being nitrogen, sulfur or oxygen and n has values sufficient to form the crown structure, viz., at least 3 or more.
Inventors
- 👤 Dane K. Parker
- 👤 Joseph A. Kuczkowski
- 👤 Michael E. Kimball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:20
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/06; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08K5/10; C08K5/101; C08K5/103; C08L; C08L71/00; C08L71/02; C08L75/00; C08L75/04; C08L75/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
The storable polypropylene ether polyurethane composition comprising a mixture of (a) an equivalent of a prepolymer formed by reacting a polypropylene ether polyol of 2 to 6 OH with sufficient organic polyisocyanate to give an excess of about 3 to 15 percent by weight of free NCO in said prepolymer with the proviso that the free NCO is obtained from methane di(phenyl isocyanate); (b) 0.7 to 1.05 equivalents of a complex of an alkali metal salt with 4,4'-methylenedianiline, said alkali metal being selected from the class consisting of sodium, potassium and lithium; and (c) a catalyst for said complex consisting of a crown or pseudocrown ether, said ether being composed of radicals having the structural formula --y--CH 2 --CH 2 ) n where y can be nitrogen, sulfur or oxygen and n is a number 3 to 100.
Claim 2
Dependent Claim
138 words
The storable polypropylene ether polyurethane composition comprising a mixture of (a) an equivalent of a prepolymer formed by reacting a polypropylene ether polyol of 2 to 6 OH with sufficient organic polyisocyanate to give an excess of about 3 to 15 percent by weight of free NCO in said prepolymer with the proviso that the free NCO is obtained from methane di(phenyl isocyanate); (b) 0.7 to 1.05 equivalents of a complex of an alkali metal salt with 4,4'-methylenedianiline, said alkali metal being selected from the class consisting of sodium, potassium and lithium; and (c) a catalyst for said complex consisting of a crown or pseudocrown ether, said ether being composed of radicals having the structural formula --y--CH 2 --CH 2 ) n where y can be nitrogen, sulfur or oxygen and n is a number 3 to 100.
Claim 3
Dependent Claim
15 words
The composition of claim 1 wherein the catalyst is the dimethyl ether of tetraethylene glycol.
Claim 4
Dependent Claim
20 words
The polyurethane composition of claim 1 wherein the polypropylene ether glycol has a molecular weight of about 900 to 4500.
Claim 5
Dependent Claim
24 words
The polyurethane composition of claim 1 containing a small amount to about 50 parts of silicate filler per 100 parts of the polyurethane composition.
Claim 6
Dependent Claim
12 words
The polyurethane composition of claim 3 wherein the silicate filler is talc.
Claim 7
Dependent Claim
16 words
The polyurethane composition of claim 1 wherein the free NCO is about 5 to 10 percent.
Claim 8
Dependent Claim
14 words
The polyurethane composition of claim 1 wherein y in the repeating radical is oxygen.
Claim 9
Dependent Claim
22 words
The polyurethane composition of claim 1 wherein the catalyst is present in from 0.1 to 20 parts per hundred of said prepolymer.
References Cited (Backward Citations)
US3726835A
Cited
US3755261A
Cited
US3876604A
Cited
US3965073A
Cited
US3891606A
Cited
US3888831A
Cited
US3899438A
Cited
US4182898A
Cited
US4282344A
Cited
US4438251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |