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US4163002A
Expired / Lapsed
US
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Filler-fortified polyalkyleneterephthalate molding compositions
Assignee: Dynamit Nobel AG
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Filing: 1977-06-20
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Granted: 1979-07-31
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Expires: 1997-06-20
Abstract
Abstract A process for preparing a filler-fortified polyalkyleneterphthalate molding composition which comprises mixing a filler with a precondensate of poly-(1,4-butylene)-terephthalate and/or poly-(1,3-propylene)-terephthalate, forming the resultant mixture into a shape and thereafter polymerizing the precondensate by solid-phase condensation under solid-phase condensation conditions; a molding composition prepared by such a process comprising poly-(1,4-butylene)-terephthalate and/or poly-(1,3-propylene)-terephthalate in an amount of 20 to 98 weight percent and 2 to 80 weight percent of a fortifying filler, the amounts based upon the combined amount of polyester and fortifying filler; a shaped object prepared from molding such a molding composition and the process for molding such a molding composition into a molded shaped article.
Inventors
- 👤 Werner Pohl
- 👤 Ernst Schainberg
- 👤 Werner Schmidt
- 👤 Gunter Tappe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:42
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
52 words
A process for preparing a filler-fortified polyalkyleneterephthalate molding composition which comprises mixing a filler with a precondensate having a viscosity number of from 40 to 160 cm 3 /g of poly-(1,4-butylene)-terephthalate and/or poly-(1,3-propylene)-terephthalate, forming the resultant mixture into a shape and thereafter polymerizing the precondensate by solid-phase condensation under solid-phase condensation conditions.
Claim 2
Dependent Claim
52 words
A process for preparing a filler-fortified polyalkyleneterephthalate molding composition which comprises mixing a filler with a precondensate having a viscosity number of from 40 to 160 cm 3 /g of poly-(1,4-butylene)-terephthalate and/or poly-(1,3-propylene)-terephthalate, forming the resultant mixture into a shape and thereafter polymerizing the precondensate by solid-phase condensation under solid-phase condensation conditions.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein 2 to 80 weight percent filler is mixed with precondensate.
Claim 4
Dependent Claim
16 words
A process according to claim 1 wherein 10 to 50 weight percent is mixed with precondensate.
Claim 5
Dependent Claim
13 words
A process according to claim 1 wherein said filler is a glass fiber.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein into said mixture of filler and precondensate there is added another additive.
Claim 7
Dependent Claim
16 words
A process according to claim 1 wherein the precondensate and filler are mixed in the melt.
Claim 8
Dependent Claim
23 words
A process according to claim 1 wherein mixing of said precondensate and filler is performed in a screw mixing or strand pressing unit.
Claim 9
Dependent Claim
21 words
A process according to claim 1 wherein after the precondensate - filler mixture is formed into a shape it is granulated.
Claim 10
Dependent Claim
21 words
A process according to claim 1 wherein said precondensate has a viscosity number of from 60 to 110 cm 3 /g.
Claim 11
Dependent Claim
21 words
A process according to claim 1 wherein said precondensate has a viscosity number of from 70 to 90 cm 3 /g.
Claim 12
Dependent Claim
33 words
A process according to claim 1 wherein the solid-phase condensation is carried out until the post-condensate has a viscosity number of more than 40 and up to 300 units higher than the precondensate.
Claim 13
Dependent Claim
33 words
A process according to claim 1 wherein the solid-phase condensation is carried out until the post-condensate has a viscosity number of more than 80 and up to 250 units higher than the precondensate.
Claim 14
Dependent Claim
33 words
A process according to claim 1 wherein the solid-phase condensation is carried out until the post-condensate has a viscosity number of more than 130 and up to 170 units higher than the precondensate.
Claim 15
Dependent Claim
36 words
A process according to claim 1 wherein the solid-phase condensation is performed at elevated temperatures but below the melting point of any crystalline content of the precondensate in an inert gas stream or in a vacuum.
Claim 16
Dependent Claim
31 words
A process according to claim 14 wherein the solid-phase condensation is effected at a temperature of 5° to 60° C. below the melting point of any crystalline content of the precondensate.
Claim 17
Dependent Claim
22 words
A process according to claim 1 wherein the filler is mixed with the precondensate while the precondensate is in the molten state.
Claim 18
Dependent Claim
83 words
In a process for forming a molded object wherein a polyester molding composition is introduced into a molding machine and subjected to molding conditions, the improvement which comprises employing as the molding composition the composition comprising 20 to 98 weight percent of poly-(1,4-butylene)-terephthalate and/or poly-(1,3-propylene)terephthalate of viscosity number of 80 to 250 and 2 to 80 weight percent of a fortifying filler, based on the combined amount of poly-(1,4-butylene)-terephthalate and/or poly-(1,3-propylene)-terephthalate and fortifying filler, said composition prepared by the process of claim 1.
Claim 19
Dependent Claim
14 words
A process according to claim 17 wherein the process is an injection molding process.
Claim 20
Dependent Claim
11 words
A filler-fortified polyalkyleneterephthalate molding composition whenever prepared according to claim 1.
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) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |