Patent US4313873A successfully refreshed from Google Patents.
US4313873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel method for reducing the processing temperature of thermoplastic polymers
Assignee: Bayer Corp
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Filing: 1979-06-18
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Granted: 1982-02-02
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Expires: 1999-06-18
Abstract
Abstract The present invention pertains to a method for reducing the processing temperature of a thermoplastic polymer comprising blending the thermoplastic polymer in powder form with an effective amount of a compound having a softening temperature of about 20 DEG to 200 DEG C. lower than the softening temperature of the thermoplastic polymer. The invention further pertains to novel chemical blowing agent concentrates.
Inventors
- 👤 In C. Lim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:10
CPC Classifications
C; C08; C08L; C08L55/00; C08L55/02; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08J9/00; C08J9/04; C08J9/06; C08L69/00; Y; Y10; Y10S; Y10S524/00; Y10S524/903
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A method for reducing the processing temperature of a thermoplastic polycarbonate comprising blending the thermoplastic polycarbonate in powder form having a maximum particle size diameter of less than about 1000 microns with an effective amount of a compound having a softening temperature of about 20° to 200° C. lower than the softening temperature of the thermoplastic polycarbonate.
Claim 2
Independent Claim
57 words
A method for reducing the processing temperature of a thermoplastic polycarbonate comprising blending the thermoplastic polycarbonate in powder form having a maximum particle size diameter of less than about 1000 microns with an effective amount of a compound having a softening temperature of about 20° to 200° C. lower than the softening temperature of the thermoplastic polycarbonate.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the processing temperature of the thermosplastic polycarbonate is reduced to a maximum of about 180° C.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein the compound having a lower softening temperature is present in from about 0.1 to 50% by weight, based on the weight of the thermoplastic polycarbonate and the lower softening temperature compound.
Claim 5
Dependent Claim
37 words
The method of claim 3 wherein the compound having a lower softening temperature is present in from about 0.5 to 30% by weight, based on the weight of the thermoplastic polycarbonate and the lower softening temperature compound.
Claim 6
Dependent Claim
74 words
A process for extruding polycarbonate at a temperature of at most about 180° C. comprising blending the polycarbonate in powder form having a maximum particle size diameter of less than about 1000 microns with about 0.1 to 50% by weight of a compound having a softening temperature of about 20° to 200° C. lower than the softening temperature of the polycarbonate, based on the weight of the polycarbonate and the lower softening temperature compound.
Claim 7
Dependent Claim
74 words
A process for extruding polycarbonate at a temperature of at most about 180° C. comprising blending the polycarbonate in powder form having a maximum particle size diameter of less than about 1000 microns with about 0.1 to 50% by weight of a compound having a softening temperature of about 20° to 200° C. lower than the softening temperature of the polycarbonate, based on the weight of the polycarbonate and the lower softening temperature compound.
Claim 8
Dependent Claim
36 words
The method of claim 1 wherein said compound having a softening temperature is present in from about 0.5 to 5.0% by weight, based on the weight of the thermoplastic polycarbonate and the lower softening temperature compound.
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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) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |