US4548991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of polycarbonate or polyestercarbonate with 4-methyl-1-pentene polymers
Assignee: Dow Chemical Co
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Filing: 1983-05-09
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Granted: 1985-10-22
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Expires: 2003-05-09
Abstract
Abstract Polycarbonate or polyestercarbonate compositions having superior environmental stress crack resistance are obtained by blending with up to about 12 weight percent of a polymer of 4-methyl-1-pentene.
Inventors
- 👤 Darrell C. Feay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:53
CPC Classifications
C; C08; C08L; C08L69/00; C08L69/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A normally-solid blend of at least one aromatic carbonate polymer with a polyolefin comprising about 2 to about 12 percent by weight of an addition polymer of 4-methyl-1-pentene per hundred parts of aromatic carbonate polymer, said addition polymer being prepared by the homopolymerization of 4-methyl-1-pentene or by copolymerization of 4-methyl-1-pentene with up to about 15 mole percent of other olefin monomers and said aromatic carbonate polymer has a weight average molecular weight of at least 25,000 and consists of a plurality of repeating units corresponding to the formula ##STR3## wherein each R is independently aromatic hydrocarbylene or inertly substituted aromatic hydrocarbylene, with the proviso that the resulting blend exhibits an Izod impact strength of at least about 5.0 foot-pounds per inch notch when tested in accordance with ASTM D-256 following immersion in 100° C. water for 1000 hours.
Claim 2
Dependent Claim
138 words
A normally-solid blend of at least one aromatic carbonate polymer with a polyolefin comprising about 2 to about 12 percent by weight of an addition polymer of 4-methyl-1-pentene per hundred parts of aromatic carbonate polymer, said addition polymer being prepared by the homopolymerization of 4-methyl-1-pentene or by copolymerization of 4-methyl-1-pentene with up to about 15 mole percent of other olefin monomers and said aromatic carbonate polymer has a weight average molecular weight of at least 25,000 and consists of a plurality of repeating units corresponding to the formula ##STR3## wherein each R is independently aromatic hydrocarbylene or inertly substituted aromatic hydrocarbylene, with the proviso that the resulting blend exhibits an Izod impact strength of at least about 5.0 foot-pounds per inch notch when tested in accordance with ASTM D-256 following immersion in 100° C. water for 1000 hours.
Claim 3
Dependent Claim
20 words
The blend as described in claim 1 wherein the carbonate polymer is derived from bisphenol A, bis-(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane or phenolphthalein.
Claim 4
Dependent Claim
17 words
The blend as described in claim 2 wherein the carbonate polymer is a polycarbonate of bisphenol A.
Claim 5
Dependent Claim
26 words
The blend as described in claim 2 wherein the addition polymer of 4-methyl-1-pentene is made from no more than 10 weight percent of other olefin monomers.
References Cited (Backward Citations)
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US3437631A
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US3801673A
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JPS55131048A
Cited
JPS55133445A
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Cited
US4427829A
Cited
JPS5834849A
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |