Patent US4517331A successfully refreshed from Google Patents.
US4517331A
Expired / Lapsed
US
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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 20:02
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.
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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) | 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 |