Patent US958538A successfully refreshed from Google Patents.
Patent US1973755A successfully refreshed from Google Patents.
US4157325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PBT molding compositions
Assignee: Hoechst Celanese Chemical Co
•
Filing: 1977-07-11
•
Granted: 1979-06-05
•
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, inert particular filler, such as glass spheres, having an aspect ratio of less than about 3 and 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
2026-10-24 23:52
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; C08L69/00; C08L81/00; C08L81/06; C08K2201/00; C08K2201/016
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
133 words
Molding composition comprising at least about 30 wt% PBT having an intrinsic viscosity between about 0.5 and about 2.0 dl/g and containing: a. between about 10 and about 50 wt% based on total weight of PBT molding composition of thermally stable glass 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 PBT of glass spheres having diameters between about 0.2 and about 20 microns and aspect ratios less than about 3, and 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 2
Dependent Claim
133 words
Molding composition comprising at least about 30 wt% PBT having an intrinsic viscosity between about 0.5 and about 2.0 dl/g and containing: a. between about 10 and about 50 wt% based on total weight of PBT molding composition of thermally stable glass 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 PBT of glass spheres having diameters between about 0.2 and about 20 microns and aspect ratios less than about 3, and 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 3
Dependent Claim
30 words
Molding composition according to claim 1 which also contains between about 1 and about 25 wt% based on total weight of PBT molding composition of an amorphous, thermally stable resin.
Claim 4
Dependent Claim
27 words
Molding composition according to caim 1 in which the fibers have diameters between about 10 and about 15 microns and aspect ratios of at least about 20.
Claim 5
Dependent Claim
27 words
Molding composition according to caim 1 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
25 words
Molding composition according to claim 2 wherein the amorphous, thermally stable resin is polymethyl methacrylate having a melt index between about 1 and about 25.
Claim 7
Dependent Claim
10 words
A molded article of the molding composition of claim 1.
Claim 8
Dependent Claim
10 words
A molded article of the molding composition of claim 2.
Claim 9
Dependent Claim
10 words
A molded article of the molding composition of claim 3.
Claim 10
Dependent Claim
10 words
A molded article of the molding composition of claim 4.
Claim 11
Independent Claim
140 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 10 and about 50 wt% based on total weight of PBT molding composition of thermally stable glass 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 weight of PBT molding composition of glass spheres having aspect ratios of less than about 3 and diameters between 0.2 and 20 microns, and 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 12
Independent Claim
140 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 10 and about 50 wt% based on total weight of PBT molding composition of thermally stable glass 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 weight of PBT molding composition of glass spheres having aspect ratios of less than about 3 and diameters between 0.2 and 20 microns, and 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 13
Dependent Claim
34 words
Method according to claim 9 wherein between about 1 and about 25 wt% based on total weight of PBT molding composition of an amorphous, thermally stable resin is also intimately blended into the composition.
Claim 14
Dependent Claim
25 words
Method according to claim 9 wherein the fibers have diameters between about 10 and about 15 microns and aspect ratios of at least about 20.
Claim 15
Dependent Claim
14 words
Method according to claim 10 wherein the amorphous, thermally stable resin is polymethyl methacrylate.
Claim 16
Dependent Claim
24 words
Method according to claim 11 wherein the amorphous, thermally stable resin is polymethyl methacrylate having a melt index between about 1 and about 25.
Claim 17
Dependent Claim
23 words
Molding composition according to claim 1 which further contains flame retardant additives in amounts up to 30 wt% of the total molding composition.
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) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |