US4704432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of polyestercarbonate with 4-methyl-1-pentene polymers
Assignee: Dow Chemical Co
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Filing: 1985-09-26
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Granted: 1987-11-03
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Expires: 2005-09-26
Abstract
Abstract 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
2026-10-29 14:19
CPC Classifications
C; C08; C08L; C08L69/00; C08L69/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
A normally solid blend of at least one aromatic ester carbonate polymer and at least one polycarbonate resin 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 ester carbonate polymer and polycarbonate resin, 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, said aromatic ester carbonate having a weight average molecular weight of at least 25,000 grams per mole and an ester to carbonate ratio of about 4:1 or less, 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 and has an overall ratio of ester-to-carbonate groups in the range from about 1:9 to about 1:2.
Claim 2
Dependent Claim
155 words
A normally solid blend of at least one aromatic ester carbonate polymer and at least one polycarbonate resin 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 ester carbonate polymer and polycarbonate resin, 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, said aromatic ester carbonate having a weight average molecular weight of at least 25,000 grams per mole and an ester to carbonate ratio of about 4:1 or less, 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 and has an overall ratio of ester-to-carbonate groups in the range from about 1:9 to about 1:2.
Claim 3
Dependent Claim
56 words
The blend as described in Claim 1 wherein the aromatic ester carbonate polymer contains a plurality of repeating units corresponding to the formula ##STR3## wherein each R is independently aromatic hydrocarbylene or inertly substituted aromatic hydrocarbylene, each R' is independently meta- or para-phenylene and x is a number greater than 0 but less than about 10.
Claim 4
Dependent Claim
22 words
The blend as described in claim 2 wherein the aromatic ester carbonate polymer is derived from bisphenol A, bis-(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane or phenolphthalein.
Claim 5
Dependent Claim
18 words
The blend as described in claim 3 wherein the aromatic ester carbonate polymer is derived from bisphenol A.
Claim 6
Dependent Claim
26 words
The blend as described in claim 3 wherein the addition polymer of 4-methyl-1-pentene is made from no more than 10 weight percent of other olefin monomers.
Claim 7
Dependent Claim
17 words
The blend as described in claim 5 wherein the aromatic ester carbonate polymer is derived from bisphenol-A.
Claim 8
Dependent Claim
28 words
The blend as described in claim 5 wherein the blend exhibits a melt flow index at least about 10 percent greater than the aromatic ester carbonate polymer alone.
References Cited (Backward Citations)
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US3437631A
Cited
JPS55131048A
Cited
JPS55133445A
Cited
US4245058A
Cited
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JPS5834849A
Cited
US4548991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |