US4539379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making silicone-polyester copolymers
Assignee: General Electric Co
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Filing: 1984-05-25
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Granted: 1985-09-03
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Expires: 2004-05-25
Abstract
Abstract A method is provided for making silicone-polyester block polymers comprising effecting reaction between an aminoalkylpolydiorganosiloxane and a polyester, such as a polyalkyleneterephthalate, under reduced pressure and under molten conditions.
Inventors
- 👤 John E. Hallgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:49
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/445
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
A method which comprises, agitating under reduced pressure at a temperature of 200° C. to 350° C. in the substantial absence of an organic solvent, a mixture of aminoalkyl chain-stopped polydiorganosiloxane and a molten thermoplastic polyester to produce a silicone-polyester copolymer having a silicone block and a polyester block joined together by a siloxy organoamide linkage having the formula ##STR7## where R 1 is selected from C.sub.(1-13) monovalent hydrocarbon radicals, substituted C.sub.(1-13) monovalent hydrocarbon radicals and C.sub.(1-8) alkoxy radicals, R 2 is a C.sub.(2-13) divalent organo radical and R 6 is a C.sub.(6-13) divalent aromatic hydrocarbon radical.
Claim 2
Independent Claim
97 words
A method which comprises, agitating under reduced pressure at a temperature of 200° C. to 350° C. in the substantial absence of an organic solvent, a mixture of aminoalkyl chain-stopped polydiorganosiloxane and a molten thermoplastic polyester to produce a silicone-polyester copolymer having a silicone block and a polyester block joined together by a siloxy organoamide linkage having the formula ##STR7## where R 1 is selected from C.sub.(1-13) monovalent hydrocarbon radicals, substituted C.sub.(1-13) monovalent hydrocarbon radicals and C.sub.(1-8) alkoxy radicals, R 2 is a C.sub.(2-13) divalent organo radical and R 6 is a C.sub.(6-13) divalent aromatic hydrocarbon radical.
Claim 3
Dependent Claim
19 words
A method in accordance with claim 1, where the amino alkyl terminated polydiorganosiloxane is an amino alkyl terminated polydimethylsiloxane.
Claim 4
Dependent Claim
14 words
A method in accordance with claim 1, where the thermoplastic polyester is a polybutyleneterephthalate.
Claim 5
Dependent Claim
16 words
A method in accordance with claim 1, where the silicone-polyester copolymer is an injection moldable thermoplastic.
Claim 6
Dependent Claim
14 words
A method in accordance with claim 1, where the silicone-polyester copolymer is an elastomer.
Claim 7
Dependent Claim
19 words
A method in accordance with claim 1, where the amino alkyl terminated polydiorganosiloxane is a γ-aminopropyl ethoxy terminated polydiorganosiloxane.
References Cited (Backward Citations)
US3701815A
Cited
US4368294A
Cited
US4273694A
Cited
US4340520A
Cited
US4348510A
Cited
US4429082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |