US4351911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable polyester composition
Assignee: General Electric Co
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Filing: 1980-08-01
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Granted: 1982-09-28
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Expires: 2000-08-01
Abstract
Abstract A foamable thermoplastic injection moldable composition comprising in admixture (a) a polyester resin, (b) a filler selected from the group consisting of fibrous glass or a mineral or mixtures thereof in an amount of from about 5 to about 50 weight percent, and (c) a minor amount of foaming agent.
Inventors
- 👤 Daniel W. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/0066; C08J9/0085; C08J9/0095; C08J2367/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
A foamable thermoplastic injection moldable composition consisting essentially of an admixture of: (a) a polyester resin selected from the group consisting of (1) a poly(ethylene terephthalate) resin or a copolyester thereof, (2) a combination of a poly(ethylene terephthalate) resin and a poly(1,4-butylene terephthalate) resin or copolyesters thereof and (3) a combination of a poly(1,4-butylene terephthalate) resin or a copolyester thereof and a linear aliphatic polyester resin; (b) a filler selected from the group consisting of fibrous glass or a mineral or mixtures thereof in an amount of from about 5 to about 50 weight percent; and (c) a minor amount of a foaming agent selected from the group consisting of dinitrosopentamethylene tetramine, p-toluene sulfonyl semicarbazide, 5-phenyltetrazole, calcium oxalate and trihydrazino-s-triazine said amount being sufficient to provide a rigid cellular core within a solid integral skin.
Claim 2
Dependent Claim
135 words
A foamable thermoplastic injection moldable composition consisting essentially of an admixture of: (a) a polyester resin selected from the group consisting of (1) a poly(ethylene terephthalate) resin or a copolyester thereof, (2) a combination of a poly(ethylene terephthalate) resin and a poly(1,4-butylene terephthalate) resin or copolyesters thereof and (3) a combination of a poly(1,4-butylene terephthalate) resin or a copolyester thereof and a linear aliphatic polyester resin; (b) a filler selected from the group consisting of fibrous glass or a mineral or mixtures thereof in an amount of from about 5 to about 50 weight percent; and (c) a minor amount of a foaming agent selected from the group consisting of dinitrosopentamethylene tetramine, p-toluene sulfonyl semicarbazide, 5-phenyltetrazole, calcium oxalate and trihydrazino-s-triazine said amount being sufficient to provide a rigid cellular core within a solid integral skin.
Claim 3
Dependent Claim
40 words
A foamable thermoplastic injection moldable composition according to claim 1 in which the foaming agent is present in an amount of from about 0.02 to about 2.0 weight percent, said weight percent being based on the total weight of resin.
Claim 4
Dependent Claim
62 words
The composition of claim 2 wherein the polyester resin combination (2) comprises (a) from about 1 to about 99 parts by weight of a poly(ethylene terephthalate) resin and (b) from about 99 to about 1 part by weight of a poly(1,4-butylene terephthalate) resin or a copolyester thereof with a minor amount of an aliphatic or aromatic dicarboxylic acid or an aliphatic polyol.
Claim 5
Dependent Claim
15 words
A composition as defined in claim 3 wherein component (b) is a poly(1,4-butylene terephthalate) resin.
Claim 6
Dependent Claim
63 words
The composition of claim 2 wherein the polyester resin combination (3) comprises (a) from about 99 to about 60 parts by weight of a poly(1,4-butylene terephthalate) resin or a copolyester thereof with a minor amount of an aliphatic or aromatic dicarboxylic acid or an aliphatic polyol and (b) from about 1 to about 40 parts by weight of a linear aliphatic polyester resin.
Claim 7
Dependent Claim
15 words
The composition as defined in claim 5 wherein component (a) is a poly(1,4-butylene terephthalate) resin.
Claim 8
Dependent Claim
29 words
The composition as defined in claim 5 wherein linear aliphatic polyester resin component (b) is poly(beta-propiolactone), poly(gamma-butyrolactone), poly(delta-valerolactone), poly-(epsilon-caprolactone) or a mixture of at least two of the foregoing.
Claim 9
Dependent Claim
15 words
A composition as defined in claim 1 wherein linear aliphatic resin component (b) is poly(epsilon-caprolactone).
Claim 10
Dependent Claim
16 words
The composition of claim 2 wherein the fibrous glass filler comprises finely divided fibrous glass filaments.
Claim 11
Dependent Claim
21 words
The composition of claim 9 wherein the fibrous glass filler consists of finely divided glass filaments treated with a binding agent.
Claim 12
Dependent Claim
11 words
The composition of claim 2 wherein the mineral filler is talc.
Claim 13
Dependent Claim
11 words
The composition of claim 2 wherein the mineral filler is asbestos.
Claim 14
Dependent Claim
11 words
The composition of claim 2 wherein the mineral filler is Wollastonite.
References Cited (Backward Citations)
US3227784A
Cited
US3230184A
Cited
US3232893A
Cited
US3227665A
Cited
US3260688A
Cited
US3211678A
Cited
US3344221A
Cited
US3474048A
Cited
US3389446A
Cited
US3671487A
Cited
US3725321A
Cited
US3953394A
Cited
US3953394B1
Cited
US4280005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |