US4140670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PBT Injection molding composition
Assignee: Hoechst Celanese Chemical Co
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Filing: 1977-07-11
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Granted: 1979-02-20
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Expires: 1997-07-11
Abstract
Abstract Molding compositon and molded products comprising polybutylene terephthalate containing thermally stable reinforcing fibers, such as glass fibers, mica and between about 5 and about 40 wt. % based on total weight of PBT molding composition of poly (butylene terephthalate-co-tetramethylene oxide). In a preferred embodiment, the composition also includes amorphous, thermally stable resins such as polymethyl methacrylate.
Inventors
- 👤 John J. Charles
- 👤 Robert C. Gasman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:01
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K3/00; C08K3/34; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L67/00; C08L67/02; C08L69/00; C08L81/00; C08L81/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
146 words
Molding composition comprising at least about 20 wt % PBT having an intrinsic viscosity between about 0.5 and about 2.0 dl/g and containing: a. between about 3 and about 50 wt % based on total molding composition of thermally stable reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5; b. between about 1 and about 40 wt % based on total molding composition of phlogopite mica having an average particle size between about 40 and about 325 mesh with at least about 90% of such mica having particle sizes between about 40 and about 200 mesh; c. between about 5 and about 40 wt % based on total molding composition of poly (butylene terephthalate-co-tetramethylene oxide) having a Shore D hardness between about 50 and about 60 and a melt index between about 7 and about 9.
Claim 2
Dependent Claim
146 words
Molding composition comprising at least about 20 wt % PBT having an intrinsic viscosity between about 0.5 and about 2.0 dl/g and containing: a. between about 3 and about 50 wt % based on total molding composition of thermally stable reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5; b. between about 1 and about 40 wt % based on total molding composition of phlogopite mica having an average particle size between about 40 and about 325 mesh with at least about 90% of such mica having particle sizes between about 40 and about 200 mesh; c. between about 5 and about 40 wt % based on total molding composition of poly (butylene terephthalate-co-tetramethylene oxide) having a Shore D hardness between about 50 and about 60 and a melt index between about 7 and about 9.
Claim 3
Dependent Claim
28 words
Molding composition according to claim 1 which also contains between about 1 and about 25 wt % based on total molding composition of an amorphous, thermally stable resin.
Claim 4
Dependent Claim
14 words
Molding composition according to claim 2 in which the reinforcing fibers are glass fibers.
Claim 5
Dependent Claim
27 words
Molding composition according to claim 3 in which the fibers have diameters between about 10 and about 15 microns and aspect ratios of at least about 20.
Claim 6
Dependent Claim
15 words
Molding composition according to claim 3 wherein the amorphous, thermally stable resin is polymethyl methacrylate.
Claim 7
Dependent Claim
49 words
Molding composition according to claim 2 wherein the reinforcing fibers are glass fibers having diameters between about 10 and about 15 microns and aspect ratios of at least about 20, and the amorphous, thermally stable resin is polymethyl methacrylate having a melt index between about 1 and about 25.
Claim 8
Dependent Claim
10 words
A molded article of the molding composition of claim 1.
Claim 9
Dependent Claim
10 words
A molded article of the molding composition of claim 2.
Claim 10
Dependent Claim
10 words
A molded article of the molding composition of claim 3.
Claim 11
Dependent Claim
10 words
A molded article of the molding composition of claim 4.
Claim 12
Dependent Claim
10 words
A molded article of the molding composition of claim 5.
Claim 13
Dependent Claim
10 words
A molded article of the molding composition of claim 6.
Claim 14
Independent Claim
155 words
A method for producing improved molding composition comprising intimately blending PBT having an intrinsic viscosity between about 0.5 and about 2.0 deciliters per gram with; a. between about 3 and about 50 wt % based on the total weight of PBT molding composition of thermally stable reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5; b. between about 1 and about 40 wt % based on total molding composition of phlogopite mica having an average particle size between about 40 and about 325 mesh with at least about 90% of such mica having particle sizes between about 40 and about 200 mesh; c. between about 5 and about 40 wt % based on total weight of PBT molding composition of poly (butylene terephthalate-co-tetramethylene oxide) having a Shore D hardness between about 50 and about 60 and a melt index between about 7 and about 9.
Claim 15
Independent Claim
155 words
A method for producing improved molding composition comprising intimately blending PBT having an intrinsic viscosity between about 0.5 and about 2.0 deciliters per gram with; a. between about 3 and about 50 wt % based on the total weight of PBT molding composition of thermally stable reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5; b. between about 1 and about 40 wt % based on total molding composition of phlogopite mica having an average particle size between about 40 and about 325 mesh with at least about 90% of such mica having particle sizes between about 40 and about 200 mesh; c. between about 5 and about 40 wt % based on total weight of PBT molding composition of poly (butylene terephthalate-co-tetramethylene oxide) having a Shore D hardness between about 50 and about 60 and a melt index between about 7 and about 9.
Claim 16
Dependent Claim
32 words
Method according to claim 13 wherein between about 1 and about 25 wt % based on total molding composition of an amorphous, thermally stable resin is also intimately blended into the composition.
Claim 17
Dependent Claim
12 words
Method according to claim 14 wherein the reinforcing fibers are glass fibers.
Claim 18
Dependent Claim
25 words
Method according to claim 15 wherein the fibers have diameters between about 10 and about 15 microns and aspect ratios of at least about 20.
Claim 19
Dependent Claim
14 words
Method according to claim 15 wherein the amorphous, thermally stable resin is polymethyl methacrylate.
Claim 20
Dependent Claim
48 words
Method according to claim 14 wherein the reinforcing fibers are glass fibers having diameters between about 10 and about 15 microns and aspect ratios of at least about 20, and the amorphous, thermally stable resin is polymethyl methacrylate having a melt index between about 1 and about 25.
Claim 21
Dependent Claim
24 words
Molding composition according to claim 1 which further contains flame retardant additives in amounts up to 30 wt % of the total molding composition.
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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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |