US4278787A
Expired / Lapsed
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Alternating copolyestercarbonate resins
Assignee: Dow Chemical Co
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Filing: 1980-07-07
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Granted: 1981-07-14
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Expires: 2000-07-07
Abstract
Abstract Alternating copolyestercarbonate resins having repeating units of the formula: ##STR1## wherein R 1 is meta-phenylene and R is independently an aromatic hydrocarbylene or inertly substituted aromatic hydrocarbylene, e.g., ##STR2## exhibit physical properties such as heat resistance, clarity and impact strength that are superior to the comparable properties of corresponding random copolymers and exhibit physical properties such as impact strength and processability that are superior to the comparable properties of corresponding alternating copolyestercarbonates wherein R 1 is para-phenylene. Such resins are useful for making transparent tough films and molded articles having high heat resistance.
Inventors
- 👤 Daniel J. Swart
- 👤 Jacqueline S. Kelyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:33
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
41 words
A normally solid alternating copolyester-carbonate having repeating units of the formula: ##STR18## wherein each R is independently an aromatic hydrocarbylene or inertly substituted hydrocarbylene, R 1 is meta-phenylene or inertly substituted meta-phenylene and x is a number from 0.05 to 10.
Claim 2
Dependent Claim
41 words
A normally solid alternating copolyester-carbonate having repeating units of the formula: ##STR18## wherein each R is independently an aromatic hydrocarbylene or inertly substituted hydrocarbylene, R 1 is meta-phenylene or inertly substituted meta-phenylene and x is a number from 0.05 to 10.
Claim 3
Dependent Claim
61 words
The copolyestercarbonate of claim 1 represented by the formula: ##STR19## wherein each R is independently aromatic hydrocarbylene or inertly substituted aromatic hydrocarbylene, R 1 is meta-phenylene; Y is --OH or ##STR20## Z is --R 2 or --ROH; R 2 is hydrocarbyl; x is a number from 0.05 to 10 and n is a whole number from about 5 to about 300.
Claim 4
Dependent Claim
16 words
The copolyestercarbonate of claim 2 wherein each R is ##STR21## and each R 1 is ##STR22##
Claim 5
Dependent Claim
23 words
The copolyestercarbonate of claim 3 wherein x is 0.05 to 3 and n is a whole number from about 30 to about 100.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |