US4168259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass reinforced PBT resins
Assignee: Hoechst Celanese Chemical Co
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Filing: 1977-07-11
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Granted: 1979-09-18
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Expires: 1997-07-11
Abstract
Abstract Molding composition and molded products comprising polybutylene terephthalate containing thermally stable reinforcing fibers, such as glass fibers, having an aspect ratio of at least about 5 and inert filler, such as glass spheres, having an aspect ratio less than about 3. In a preferred embodiment, the composition also includes amorphous, thermally stable resins such as polymethyl methacrylate.
Inventors
- 👤 Ernest A. Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:01
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L67/00; C08L67/02; C08K2201/00; C08K2201/016
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
80 words
Molding composition comprising at least about 25 wt% PBT having an intrinsic viscosity between about 0.5 and about 1.5 dl/g and containing: (a) between about 10 and about 100 wt% based on PBT of thermally stable glass reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5; and (b) between about 1 and about 40 wt% based on PBT of solid glass spheres having diameters between about 0.2 and 50 microns.
Claim 2
Dependent Claim
80 words
Molding composition comprising at least about 25 wt% PBT having an intrinsic viscosity between about 0.5 and about 1.5 dl/g and containing: (a) between about 10 and about 100 wt% based on PBT of thermally stable glass reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5; and (b) between about 1 and about 40 wt% based on PBT of solid glass spheres having diameters between about 0.2 and 50 microns.
Claim 3
Dependent Claim
25 words
Molding composition according to claim 1 which also contains between about 10 and about 100 wt% based on PBT of an amorphous, thermally stable resin.
Claim 4
Dependent Claim
26 words
Molding composition according to claim 1 in which the fibers have diameters between about 10 and about 15 microns and aspect ratios less than about 20.
Claim 5
Dependent Claim
27 words
Molding composition according to claim 2 wherein the amorphous, thermally stable resin is polymethyl methacrylate having a number average molecular weight between about 5,000 and about 500,000.
Claim 6
Dependent Claim
10 words
A molded article of the molding composition of claim 1.
Claim 7
Dependent Claim
10 words
A molded article of the molding composition of claim 2.
Claim 8
Dependent Claim
10 words
A molded article of the molding composition of claim 3.
Claim 9
Dependent Claim
10 words
A molded article of the molding composition of claim 4.
Claim 10
Independent Claim
85 words
A method for producing an improved molding composition comprising intimately blending PBT having an intrinsic viscosity between about 0.5 and about 1.5 deciliters per gram with: (a) between about 10 and about 100 wt% based on PBT of thermally stable glass reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5; and (b) between about 1 and about 40 wt% based on PBT of solid glass spheres having diameters between about 0.2 and about 50 microns.
Claim 11
Independent Claim
85 words
A method for producing an improved molding composition comprising intimately blending PBT having an intrinsic viscosity between about 0.5 and about 1.5 deciliters per gram with: (a) between about 10 and about 100 wt% based on PBT of thermally stable glass reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5; and (b) between about 1 and about 40 wt% based on PBT of solid glass spheres having diameters between about 0.2 and about 50 microns.
Claim 12
Dependent Claim
29 words
Method according to claim 9 wherein between about 10 and about 100 wt% based on PBT of an amorphous, thermally stable resin is also intimately blended into the composition.
Claim 13
Dependent Claim
24 words
Method according to claim 9 wherein the fibers have diameters between about 10 and about 15 microns and aspect ratios greater than about 20.
Claim 14
Dependent Claim
14 words
Method according to claim 10 wherein the amorphous, thermally stable resin is polymethyl methacrylate.
Claim 15
Dependent Claim
26 words
Method according to claim 10 wherein the amorphous, thermally stable resin is polymethyl methacrylate having a number average molecular weight between about 5,000 and about 500,000.
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) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |