US4306052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polyester polyurethanes
Assignee: Dow Chemical Co
•
Filing: 1980-09-25
•
Granted: 1981-12-15
•
Expires: 2000-09-25
Abstract
Abstract Novel thermoplastic polyester polyurethanes are disclosed which are obtained by reacting a polyester diol, a difunctional extender, a methylenebis(phenyl isocyanate), and from about 0.0025 mole to about 0.03 mole per equivalent of isocyanate of a monocarbodiimide product derived from a methylenebis(phenyl isocyanate) or the corresponding uretidinedioneimine adduct thereof with said latter methylenebis(phenyl isocyanate). The polyester polyurethanes are characterized by a combination of thermoplasticity, extremely good hydrolytic stability which cannot be diminished by solvent action, good physical properties, particularly tensile strength and elongation, and enhanced clarity of molded articles.
Inventors
- 👤 Henry W. Bonk
- 👤 Richard W. Oertel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/70; C08G18/72; C08G18/721; C08G18/725; C08G18/77; C08G18/78; C08G18/79; C08G18/797
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
In a thermoplastic polyester polyurethane prepared from a polyester diol, a difunctional extender, and methylenebis(phenyl isocyanate) the improvement which comprises employing a methylenebis(phenyl isocyanate) which contains from about 0.0025 mole to about 0.03 mole per equivalent of isocyanate of (i) a monocarbodiimide product derived from a methylenebis(phenyl isocyanate) or (ii) the corresponding uretidinedioneimine adduct formed by said monocarbodiimide with said methylenebis(phenyl isocyante).
Claim 2
Dependent Claim
62 words
In a thermoplastic polyester polyurethane prepared from a polyester diol, a difunctional extender, and methylenebis(phenyl isocyanate) the improvement which comprises employing a methylenebis(phenyl isocyanate) which contains from about 0.0025 mole to about 0.03 mole per equivalent of isocyanate of (i) a monocarbodiimide product derived from a methylenebis(phenyl isocyanate) or (ii) the corresponding uretidinedioneimine adduct formed by said monocarbodiimide with said methylenebis(phenyl isocyante).
Claim 3
Dependent Claim
17 words
A thermoplastic polyurethane according to claim 1 wherein said methylenebis(phenyl isocyanate) in both cases is 4,4'-methylenebis(phenyl isocyanate).
Claim 4
Dependent Claim
77 words
A thermoplastic polyurethane according to claim 2 wherein said 4,4'-methylenebis(phenyl isocyanate) is comprised of a blend of from about 50 to about 95 equivalent percent of 4,4'-methylenebis(phenyl isocyanate) and the remaining 5 to 50 equivalent percent being a 4,4'-methylenebis(phenyl isocyanate) containing from about 0.05 mole to about 0.06 mole per equivalent of said latter isocyanate of the monocarbodiimide product derived from said 4,4'-methylenebis(phenyl isocyanate) or the corresponding uretidinedioneimine adduct formed by said monocarbodiimide with said 4,4'-methylenebis(phenyl isocyanate).
Claim 5
Dependent Claim
16 words
A thermoplastic polyurethane according to claim 1 wherein said polyester diol is a polyalkylene ester diol.
Claim 6
Dependent Claim
25 words
A thermoplastic polyurethane according to claim 1 wherein said difunctional extender is an aliphatic straight chain diol having from two to six carbon atoms, inclusive.
Claim 7
Dependent Claim
52 words
A thermoplastic polyurethane according to claim 1 wherein the equivalent proportion of said polyester diol to said difunctional extender is within the range of about 1:1 to about 1:12 and the overall ratio of equivalents of isocyanate to equivalents of active hydrogen containing materials is within the range of 0.95:1 to 1.10:1.
Claim 8
Dependent Claim
129 words
A thermoplastic polyurethane prepared from: (a) a blend comprising from about 50 to about 95 equivalent percent of 4,4'-methylenebis(phenyl isocyanate) and the remaining 5 to 50 equivalent percent being 4,4'-methylenebis(phenyl isocyanate) containing from about 0.05 mole to about 0.06 mole per equivalent of said latter isocyanate of (i) the monocarbodiimide product derived from said 4,4'-methylenebis(phenyl isocyanate), or (ii) the corresponding uretidinedioneimine adduct formed by said monocarbodiimide with said 4,4'-methylenebis(phenyl isocyanate), (b) a polyalkylene ester diol, (c) an aliphatic straight chain diol having from two to six carbon atoms, inclusive, wherein the equivalent proportions of (b) to (c) is within the range of from about 1:1 to 1:12 and the overall ratio of equivalents of isocyanate to equivalents of active hydrogen materials is within the range of 0.95:1 to 1.10:1.
Claim 9
Dependent Claim
129 words
A thermoplastic polyurethane prepared from: (a) a blend comprising from about 50 to about 95 equivalent percent of 4,4'-methylenebis(phenyl isocyanate) and the remaining 5 to 50 equivalent percent being 4,4'-methylenebis(phenyl isocyanate) containing from about 0.05 mole to about 0.06 mole per equivalent of said latter isocyanate of (i) the monocarbodiimide product derived from said 4,4'-methylenebis(phenyl isocyanate), or (ii) the corresponding uretidinedioneimine adduct formed by said monocarbodiimide with said 4,4'-methylenebis(phenyl isocyanate), (b) a polyalkylene ester diol, (c) an aliphatic straight chain diol having from two to six carbon atoms, inclusive, wherein the equivalent proportions of (b) to (c) is within the range of from about 1:1 to 1:12 and the overall ratio of equivalents of isocyanate to equivalents of active hydrogen materials is within the range of 0.95:1 to 1.10:1.
Claim 10
Dependent Claim
30 words
A thermoplastic polyurethane according to claim 7 wherein (a) is comprised of a 75/25 equivalent percent blend of 4,4'-methylenebis(phenyl isocyanate) and said 4,4'-methylenebis(phenyl isocyanate) containing said (i) or (ii) respectively.
Claim 11
Dependent Claim
29 words
A thermoplastic polyurethane according to claim 8 wherein (b) is a polyethylene adipate diol having a molecular weight of from about 1500 to about 2500 and (c) is 1,4-butanediol.
References Cited (Backward Citations)
US3193522A
Cited
US3226368A
Cited
US3248373A
Cited
US3394111A
Cited
US3761502A
Cited
US3907780A
Cited
US3929733A
Cited
US4031026A
Cited
US4088665A
Cited
US4120884A
Cited
US4184031A
Cited
US4154752A
Cited
US4239857A
Cited
US4199524A
Cited
US4177205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |