US3627735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane elastomeric-shaped articles containing reactive sites
Assignee: Individual
•
Filing: 1969-11-12
•
Granted: 1971-12-14
•
Expires: 1989-11-12
Abstract
Abstract Polymeric elastomers are prepared by chain extension of urethane prepolymer with guanidine. The imino hydrogen in the elastomeric chain is reactive toward isocyanate groups, thereby enabling cross linking and the direct chemical attachment of additives such as dye sites, antioxidants and the like directly to the polymer backbone either prior to or after article forming.
Inventors
- 👤 Louis E Trapasso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/906; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
23 words
The process of claim 1 wherein said additive contains an amine or hydroxyl functional group which is chemically reactive with an isocyanate group.
Claim 2
Dependent Claim
15 words
The process of claim 2 including the additional step of forming into said shaped article.
Claim 3
Dependent Claim
152 words
The process of claim 2 wherein said polyurethane elastomer is prepared by chain extending a urethane prepolymer with guanidine and comprises a copolymer consisting essentially of repeating structural units represented by the formula: wherein R is the polymeric residue remaining after removal of the terminal active hydrogen atoms from a difunctional organic polymer represented by the formula: and having a melting point below about 60* C. and a molecular weight between about 700 and 5,000 and wherein x has a value of 0, 1 or 2; Q is the polymeric residue remaining after removal of the terminal active hydrogen atoms from a difunctional organic polymer H-Q-H having a melting point below about 60* C. and a molecular weight above about 230; B and B'' are nonpolymeric divalent organic radicals inert to isocyanate groups and representing the residue of the diisocyanate compounds B(NCP)2 and B''(NCO)2, respectively and m and n are positive integers.
Claim 4
Dependent Claim
27 words
The polyurethane elastomer of claim 4 wherein the difunctional organic polymer HQH is selected from the group consisting of poly(alkylene oxide) gylcols, hydroxy-terminated polyesters and hydroxy-terminated polylactones.
Claim 5
Dependent Claim
179 words
A polyurethane elastomer prepared by chain-extending in solution a urethane prepolymer with guanidine, said polyurethane elastomer comprising a copolymer consisting essentially of repeating structural units represented by the formula: wherein R is the polymeric residue remaining after removal of the terminal active hydrogen atoms from a difunctional organic polymer represented by the formula: and having a melting point below about 60* C. and a molecular weight between about 700 and 5,000 and wherein x has a value of 0, 1 or 2; Q is the polymeric residue remaining after removal of the terminal active hydrogen atoms from a difunctional organic polymer H-Q-H having a melting point below about 60* C. and a molecular weight above about 230; B and B'' are nonpolymeric divalent organic radicals inert to isocyanate groups and represent the residue of the diisocyanate compounds (BNCO)2 and B''(NCO)2, respectively; and m and n are positive integers, said polyurethane elastomer containing additive attached through a diisocyanate compound to the imino group of the guanidine segment of said polyurethane elastomer, said attachment being carried out be reacting in solution.
Claim 6
Dependent Claim
26 words
The elastomer of claim 6 wherein the difunctional organic elastomer HQH is selected from the group consisting of poly(alkylene oxide) glycols, hydroxy-terminated polyesters and hydroxy-terminated polylactones.
Claim 7
Dependent Claim
10 words
A shaped article formed from the polymer of claim 7.
Claim 8
Dependent Claim
12 words
The shaped article of claim 8 in the form of a film.
Claim 9
Dependent Claim
12 words
The shaped article of claim 8 in the form of a fiber.
Claim 10
Dependent Claim
9 words
The elastomer of claim 7 wherein HQH is polycaprolactone.
Claim 11
Dependent Claim
9 words
The elastomer of claim 7 wherein HQH is polytetrahydrofuran
Claim 12
Dependent Claim
9 words
A film formed from the elastomer of claim 12.
Claim 13
Dependent Claim
9 words
A fiber formed from the elastomer of claim 12.
References Cited (Backward Citations)
US3461106A
Cited
US3461102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |