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 12:44
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.
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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) | 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 |