Patent US3764576A successfully refreshed from Google Patents.
US3764576A
Expired / Lapsed
US
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Moldable polybutylene terephthalate compositions containing acicular calcium metasilicate
Assignee: Celanese Corp
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Filing: 1971-12-15
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Granted: 1973-10-09
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Expires: 1991-12-15
Abstract
Abstract Filled thermoplastic compositions comprising linear crystallizable polybutylene terephthalate with an I.V. of from about 0.2 to 1.5 deciliters/gm and acicular calcium metasilicate (calcium silicate). Articles molded from the thermoplastic compositions possess highly glossed surfaces which are retained at high temperatures; have superior arc resistance which increases with increasing silicate concentration; and are essentially warpage-free even under asymmetrically gated conditions. The thermoplastic compositions and articles molded therefrom can advantageously contain up to about 60 weight percent based on the total molding composition of reinforcing agents, such as asbestos fibers, glass fibers, etc.
Inventors
- 👤 R Russo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:58
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
28 words
The molding resin of claim 1 wherein the acicular calcium metasilicate is present in the range of from about 10 to about 65 weight percent of total composition.
Claim 2
Dependent Claim
54 words
A molding resin having improved arc resistance comprising an intimate blend of polybutylene terephthalate having an intrinsic viscosity in the range of from about 0.2 to about 1.5 deciliters per gram; reinforcing agent; and acicular calcium metasilicate present in the range of from about 2 to about 75 weight percent of the total composition.
Claim 3
Dependent Claim
27 words
The molding resin of claim 3 wherein reinforcing agent is present in the range of from about 2 to about 60 weight percent of the total composition.
Claim 4
Dependent Claim
76 words
A molding resin having improved arc resistance comprising an intimate blend of polybutylene terephthalate having an intrinsic viscosity in the range of from about 0.2 to about 1.5 deciliters per gram; glass fiber reinforcing agent up to about 60 weight percent of the total composition; asbestos fiber reinforcing agent up to about 30 weight percent of the total composition; and acicular calcium metasilicate at from about 2 to about 75 weight percent of the total composition.
Claim 5
Dependent Claim
82 words
A molding resin having improved arc resistance comprising an intimate blend of polybutylene terephthalate having an intrinsic viscosity in the range of from about 0.2 to about 1.5 deciliters per gram; glass fiber reinforcing agent at from about 5 to about 30 weight percent of the total composition; asbestos fiber reinforcing agent at from about 1 to about 5 weight percent of the total composition, and acicular calcium metasilicate at from about 10 to about 65 weight percent of the total composition.
Claim 6
Dependent Claim
49 words
A process for preparing a molding resin having improved arc resistance comprising intimately blending polybutylene terephthalate having an intrinsic viscosity in the range of from about 0.2 to about 1.5 deciliters per gram with from about 10 to 65 weight percent of the total composition of acicular calcium metasilicate.
Claim 7
Dependent Claim
79 words
A process for preparing a molding resin having improved arc resistance comprising intimately blending polybutylene terephthalate having an intrinsic viscosity in the range of from about 0.2 to about 1.5 deciliters per gram; a glass fiber reinforcing agent up to about 60 weight percent of the total composition; asbestos fiber reinforcing agent up to about 30 weight percent of the total composition; and acicular calcium metasilicate at from about 2 to about 75 weight percent of the total composition.
Claim 8
Dependent Claim
85 words
A process for preparing a molding resin having improved arc resistance comprising intimately blending polybutylene terephthalate having an intrinsic viscosity in the range of from about 0.2 to about 1.5 deciliters per gram; a glass fiber reinforcing agent at from about 5 to about 30 weight percent of the total composition; asbestos fiber reinforcing agent at from about 1 to about 5 weight percent of the total composition; and acicular calcium metasilicate at from about 10 to about 65 weight percent of the total composition.
Claim 9
Dependent Claim
68 words
The molding resin of claim 1 comprising in addition, an aromatic halide stable at temperature necessary for melt processing polybutylene terephthalate and capable of decomposing at combustion temperatures of polybutylene terephthalate and a group Vb metal containing compound, wherein the weight ratio of available halide in the aromaTic halide to the available group Vb metal in the group Vb metal containing compound ranges from 0.3 to about 4.
Claim 10
Dependent Claim
85 words
The molding resin of claim 12 comprising from about 3.3 to about 16.6 weight percent halide, based on the weight of the resin of an aromatic halide selected from the group consisting of tetrabromophthalic anhydride, tetrachlorophthalic anhydride, decabromobiphenyl ether and decachlorobiphenyl ether and from about 0.7 to about 10.0 weight percent metal, based on the weight of the resin, of antimony trioxide, the ratio of available halide in the aromatic halide to available antimony in the antimony being greater than about 0.46 to about 4.0.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |