US4544677A
Expired / Lapsed
US
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Foamable polycarbonate compositions, articles and methods
Assignee: General Electric Co
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Filing: 1984-04-10
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Granted: 1985-10-01
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Expires: 2004-04-10
Abstract
Abstract A foamable thermoplastic composition comprising in admixture (a) a polycarbonate resin, alone, or with (b) a polyester, (c) a minor amount of a foaming agent and (d) a minor amount of an inorganic non-fibrous particulate nucleating agent, alone, or with a particulate organic polymeric material, wherein (d) has an aspect ratio of about 1 and a small particle size.
Inventors
- 👤 Richard B. Allen
- 👤 Roger W. Avakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08J9/0061; C08J9/04; C08J9/06; C08J9/10; C08J2369/00; Y; Y10; Y10S; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
144 words
A foamable thermoplastic composition comprising (a) an aromatic polycarbonate, an aromatic polyester carbonate, an aromatic dihydric phenol sulfone carbonate, or a mixture of any of the foregoing, alone, or in combination with (b) a saturated polyester resin comprising units of an aliphatic diol, a cycloaliphatic diol, or a mixture of said diols and an aromatic diacid or a cycloaliphatic diacid, (c) a minor effective amount of a chemical foaming agent; and (d) a minor effective amount of siliceous particulate foam nucleating agent which is coated with a siliceous compound to render that agent hydrophobic, alone, or combined with a particulate organic polymeric material, said nucleating agent being substantially insoluble in the composition and having an aspect ratio of not greater than about 1.0, the amounts of (c) and (d) being sufficient to provide a rigid substantially uniform cellular core within a solid integral skin.
Claim 2
Dependent Claim
144 words
A foamable thermoplastic composition comprising (a) an aromatic polycarbonate, an aromatic polyester carbonate, an aromatic dihydric phenol sulfone carbonate, or a mixture of any of the foregoing, alone, or in combination with (b) a saturated polyester resin comprising units of an aliphatic diol, a cycloaliphatic diol, or a mixture of said diols and an aromatic diacid or a cycloaliphatic diacid, (c) a minor effective amount of a chemical foaming agent; and (d) a minor effective amount of siliceous particulate foam nucleating agent which is coated with a siliceous compound to render that agent hydrophobic, alone, or combined with a particulate organic polymeric material, said nucleating agent being substantially insoluble in the composition and having an aspect ratio of not greater than about 1.0, the amounts of (c) and (d) being sufficient to provide a rigid substantially uniform cellular core within a solid integral skin.
Claim 3
Dependent Claim
22 words
A composition as defined in claim 1 which is substantially free of fillers having an aspect ratio of greater than about 1.0.
Claim 4
Dependent Claim
38 words
A composition as defined in claim 1 wherein said foaming agent (c) is present in an amount of from about 0.02 to about 2.0 parts by weight based on the 100 parts by weight of the total composition.
Claim 5
Dependent Claim
37 words
A composition as defined in claim 1 wherein said foam nucleating agent (d) is present in an amount of from about 0.01 to about 40 parts by weight per 100 parts by weight of the total composition.
Claim 6
Dependent Claim
31 words
A composition as defined in claim 1 wherein foam nucleating agent (d) is selected from amorphous silica, precipitated silica and fumed silica, alone or together with an organic polymeric particulate material.
Claim 7
Dependent Claim
24 words
A composition as defined in claim 5, in which the particulate organic polymeric material is selected from acrylate copolymers, polyphenylene ether resins and polytetrafluoroethylenes.
Claim 8
Dependent Claim
17 words
A composition as defined in claim 6, in which the particulate organic polymer is an acrylate copolymer.
Claim 9
Dependent Claim
20 words
A composition as defined in claim 7, in which the acrylate copolymer is an acrylate-based coreshell multi-phase composite interpolymer resin.
Claim 10
Dependent Claim
47 words
A composition as defined in claim 8, in which the core-shell interpolymer comprises about 25 to 95 percent by weight of a first elastomeric phase and about 75 to 5 percent by weight of a final rigid thermoplastic shell phase, and optionally one or more intermediate phases.
Claim 11
Dependent Claim
48 words
A composition as defined in claim 9, in which the core-shell interpolymer has been polymerized from a C 1 to C 6 alkyl acrylate resulting in an acrylic rubber core crosslinked with a crosslinking polyethylenically unsaturated monomer and further containing a graftlinking monomer which is also polyethylenically unsaturated.
Claim 12
Dependent Claim
15 words
A composition as defined in claim 10, in which the alkyl acrylate is butyl acrylate.
Claim 13
Dependent Claim
18 words
A composition as defined in claim 6, in which the particulate organic polymer is a polyphenylene ether resin.
Claim 14
Dependent Claim
16 words
A composition as defined in claim 12, in which the polyphenylene ether resin is poly(2,6-dimethyl-1,4-phenylene ether).
Claim 15
Dependent Claim
15 words
A composition as defined in claim 6, in which the particulate organic polymer is polytetrafluorethylene.
Claim 16
Dependent Claim
35 words
A composition as defined in claim 1 which also includes a surface active agent compound comprising a silicone, a polyglycol ether, a fluorocarbon, a fatty acid derivative or a mixture of any of the foregoing.
Claim 17
Dependent Claim
26 words
A composition as defined in claim 1 which also includes (e) an effective amount of a modifier to increase the flow of the composition during molding.
Claim 18
Dependent Claim
28 words
A composition as defined in claim 8 wherein said modifier (e) is selected from waxes, fatty acid esters, polyethylene waxes or a mixture of any of the foregoing.
Claim 19
Dependent Claim
25 words
A composition as defined in claim 1 which also includes (f) an effective amount of a modifier to increase the impact strength of the composition.
Claim 20
Dependent Claim
14 words
A composition as defined in claim 1 wherein component (a) comprises an aromatic polycarbonate.
Claim 21
Dependent Claim
14 words
A composition as defined in claim 12 wherein component (a) comprises poly(bisphenol A) carbonate.
Claim 22
Dependent Claim
29 words
A composition as defined in claim 1 wherein component (c) comprises a chemical compound which can be decomposed to release a gas harmless to resin components (a) and (b).
Claim 23
Dependent Claim
37 words
A composition as defined in claim 21 wherein component (c) comprises a nitroso compound, a semicarbazide compound, a tetrazole compound, an oxalate compound, a triazine compound, a dihydrooxadiazinone compound, or a mixture of any of the foregoing.
Claim 24
Dependent Claim
12 words
A composition as defined in claim 22 wherein component (c) comprises 5-phenyl-3,6-dihydro-1,3,4-oxadiazin-2-one.
Claim 25
Dependent Claim
15 words
A composition as defined in claim 1 wherein component (d) comprises a synthetic, non-crystalline silica.
Claim 26
Dependent Claim
23 words
A composition as defined in claim 24 wherein component (d) has an average particle size in the range of 0.5 to 50 microns.
Claim 27
Dependent Claim
23 words
A composition as defined in claim 25 wherein component (d) has an average particle size in the range of 0.008 to 0.020, microns.
Claim 28
Dependent Claim
12 words
A composition as defined in claim 26 wherein component (d) is hydrophobic.
Claim 29
Dependent Claim
80 words
A foamable thermoplastic composition comprising (a) poly(bisphenol A carbonate); (c) from about 0.02 to about 2.0 parts by weight of a dihydrooxadiazinone foaming agent, and (d) from about 0.1 to 5.0 parts by weight of a particulate, synthetic, non-crystalline hydrophobic silica which is coated with a siliceous compound to render that silica hydrophobic, having an average particle diameter of less than about-10 microns, the parts by weight being based on 100 parts by weight total of (a), (c) and (d).
Claim 30
Dependent Claim
80 words
A foamable thermoplastic composition comprising (a) poly(bisphenol A carbonate); (c) from about 0.02 to about 2.0 parts by weight of a dihydrooxadiazinone foaming agent, and (d) from about 0.1 to 5.0 parts by weight of a particulate, synthetic, non-crystalline hydrophobic silica which is coated with a siliceous compound to render that silica hydrophobic, having an average particle diameter of less than about-10 microns, the parts by weight being based on 100 parts by weight total of (a), (c) and (d).
Claim 31
Dependent Claim
13 words
An article of manufacture comprising a foamed composition as defined in claim 1.
Claim 32
Dependent Claim
30 words
An article of manufacture formed by foaming a composition as defined in claim 29, said article comprising a rigid, substantially void-free, substantially uniform cellular core within a solid integral skin.
References Cited (Backward Citations)
US3232893A
Cited
US3260688A
Cited
US3474043A
Cited
US3743605A
Cited
US4097425A
Cited
US4174432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |