US4880847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polyurethane endowed with improved characteristics of resistance to heat distortion
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1987-07-21
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Granted: 1989-11-14
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Expires: 2007-07-21
Abstract
Abstract A thermoplastic polyurethane endowed with improved heat distortion resistance, which comprises the product of reaction of at least one polyisocyanate, preferably an organic diisocyanate; at least one polyol material reactive with the isocyanate and having a molecular weight higher than 400; a chain extender having a molecular weight lower than 400; and an aromatic anhydride having the formula (I): ##STR1## wherein A is a possibly substituted (C 6 -C 30 ) aromatic radical, m may be 0 or an integer from 1 to 3, and n is an integer equal to 1 or 2.
Inventors
- 👤 Lino Credali
- 👤 Carlo Mulas
- 👤 Ermanno Benetti
- 👤 Gianflavio Lunardon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:54
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8048; C08G18/08; C08G18/10; C08G18/28; C08G18/65; C08G18/6541
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
152 words
A process for the manufacture of a thermoplastic polyurethane showing an improved heat distortion resistance, consisting essentially of the following steps: (a) reaction of an organic polyisocyanate, at 50°-250° C. and until the CO 2 release comes to an end, with at least one aromatic anhydride, optionally bearing carboxylic substitutive groups, and having the formula: ##STR3## where A represents a substituted or unsubstituted aromatic radical containing from 6 to 20 carbon atoms, m is 0 or an integer from 1 to 3, and n is an integer equal to 1 or 2; (b) addition to the above mixture, at 50° -150° C., of at least one polyol, reactive with said polyisocyanate and having a molecular weight higher than 400; (c) addition of a chain extender having a molecular weight lower than 400; and (d) pouring the homogenized mixture into a mold, where it is aged at a temperature higher than 150° C.
Claim 2
Dependent Claim
152 words
A process for the manufacture of a thermoplastic polyurethane showing an improved heat distortion resistance, consisting essentially of the following steps: (a) reaction of an organic polyisocyanate, at 50°-250° C. and until the CO 2 release comes to an end, with at least one aromatic anhydride, optionally bearing carboxylic substitutive groups, and having the formula: ##STR3## where A represents a substituted or unsubstituted aromatic radical containing from 6 to 20 carbon atoms, m is 0 or an integer from 1 to 3, and n is an integer equal to 1 or 2; (b) addition to the above mixture, at 50° -150° C., of at least one polyol, reactive with said polyisocyanate and having a molecular weight higher than 400; (c) addition of a chain extender having a molecular weight lower than 400; and (d) pouring the homogenized mixture into a mold, where it is aged at a temperature higher than 150° C.
Claim 3
Dependent Claim
32 words
A process according to claim 1, wherein the temperature of step a) is from 100° to 210° C. and wherein the time required by step b) is from 30 to 150 minutes.
Claim 4
Dependent Claim
30 words
A process according to claim 1, wherein the amount of said anhydride is at least 5% by weight, with respect to the sum of said polyol and said chain extender.
Claim 5
Dependent Claim
13 words
A process according to claim 1, wherein said aromatic anhydride is trimellitic anhydride.
Claim 6
Dependent Claim
13 words
A process according to claim 1, wherein said aromatic anhydride is pyromellitic anhydride.
Claim 7
Dependent Claim
23 words
A process according to claim 3, wherein the amount of said aromatic anhydride is from 5 to 80%, with respect to said sum.
Claim 8
Dependent Claim
23 words
A process according to claim 3, wherein the amount of said aromatic anhydride is from 10 to 40%, with respect to said sum.
Claim 9
Dependent Claim
20 words
A process according to claim 1, wherein said organic polyisocyanate is 2,4- and 2,6-toluenediisocyanate, in a 80/20 ratio, or 4,4'-methylene-diphenyl-diisocyanate.
Claim 10
Dependent Claim
26 words
A process according to claim 1 characterized in that said polyol reactive with polyisocyanate is a difunctional polyether-polyol, having a molecular weight from 500 to 10000.
Claim 11
Dependent Claim
26 words
A process according to claim 1 characterized in that said polyol reactive with polyisocyanate is a difunctional polyether-polyol, having a molecular weight from 1000 to 6000.
Claim 12
Dependent Claim
26 words
A process according to claim 1, characterized in that said chain extender is a straight-chain or branched-chain aliphatic diol containing from 2 to 8 carbon atoms.
Claim 13
Dependent Claim
25 words
A process according to claim 1, wherein the mixture of said polyol and of said chain extender has an average molecular weight lower than 500.
Claim 14
Dependent Claim
25 words
A process according to claim 1, wherein the mixture of said polyol and of said chain extender has an average molecular weight lower than 300.
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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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |