Patent US5721484A successfully refreshed from Google Patents.
Patent US4097435A successfully refreshed from Google Patents.
US4097435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-filled polycarbonate of improved ductility
Assignee: Bayer Corp
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Filing: 1977-04-11
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Granted: 1978-06-27
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Expires: 1997-04-11
Abstract
Abstract A glass-fiber reinforced aromatic polycarbonate is provided with improved ductility and improved mold release properties which is comprised of an aromatic polycarbonate resin, glass-fibers and an ester wax of montanic acid.
Inventors
- 👤 Herbert L. Rawlings
- 👤 Arthur L. Baron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:07
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/103; C08K3/00; C08K3/40; C08K7/00; C08K7/02; C08K7/04; C08K7/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A polycarbonate molding composition comprising (a) an aromatic polycarbonate resin, (b) about 5 to 40% by weight, based upon the total composition, of glass fibers, and (c) about 0.1 to 2% by weight, based upon the total composition, of an ester wax of montanic acid made by esterifying said acid with a fatty alcohol or a low molecular weight glycol, said alcohol or glycol having upto and including 26 carbon atoms.
Claim 2
Dependent Claim
71 words
A polycarbonate molding composition comprising (a) an aromatic polycarbonate resin, (b) about 5 to 40% by weight, based upon the total composition, of glass fibers, and (c) about 0.1 to 2% by weight, based upon the total composition, of an ester wax of montanic acid made by esterifying said acid with a fatty alcohol or a low molecular weight glycol, said alcohol or glycol having upto and including 26 carbon atoms.
Claim 3
Dependent Claim
42 words
The molding composition of claim 1 wherein about 10 to 30% by weight, based upon the total composition, of glass fibers and about 0.35 to 0.70% by weight, based upon the total composition, of an ester wax of montanic acid is present.
Claim 4
Dependent Claim
16 words
The molding composition of claim 1 wherein sufficient pigment to opacify the polycarbonate resin is present.
Claim 5
Dependent Claim
25 words
The molding composition of claim 3 wherein the pigment is present in amounts of from about 1 to 18 grams per pound of aromatic polycarbonate.
Claim 6
Dependent Claim
47 words
The molding composition of claim 1 wherein the ester wax of montanic acid consists essentially of esters of the general formula ##STR4## wherein n and n' may be the same or different and are between 25 and 31 inclusive, and a is between 1 and 13 inclusive.
Claim 7
Dependent Claim
10 words
The molding composition of claim 5 wherein a is 1.
Claim 8
Dependent Claim
19 words
The molding composition of claim 1 wherein the aromatic polycarbonate resin comprises the reaction product of bisphenol-A and phosgene.
Claim 9
Dependent Claim
20 words
The molding composition of claim 1 wherein the aromatic polycarbonate resin comprises the reaction product of bisphenol-A, tetrabromobisphenol-A and phosgene.
Claim 10
Dependent Claim
39 words
The molding composition of claim 1 wherein the aromatic polycarbonate resin has a weight average molecular weight of from about 10,000 to 200,000 and a melt flow rate range of about 1 to 24 g/10 min. (ASTM D 1238).
Claim 11
Dependent Claim
82 words
A process for improving the ductility and mold release properties of a polycarbonate comprising melt blending: (a) an aromatic polycarbonate resin, (b) about 5 to 40% by weight, based on the total composition of glass fibers, and (c) about 0.1 to 2% by weight, based upon the total composition, of an ester wax of montanic acid made by esterifying said acid with a fatty alcohol or a low molecular weight glycol, said alcohol or glycol having upto and including 26 carbon atoms.
Claim 12
Dependent Claim
82 words
A process for improving the ductility and mold release properties of a polycarbonate comprising melt blending: (a) an aromatic polycarbonate resin, (b) about 5 to 40% by weight, based on the total composition of glass fibers, and (c) about 0.1 to 2% by weight, based upon the total composition, of an ester wax of montanic acid made by esterifying said acid with a fatty alcohol or a low molecular weight glycol, said alcohol or glycol having upto and including 26 carbon atoms.
Claim 13
Dependent Claim
20 words
The process of claim 10 wherein about 1 to 18 grams of pigment per pound of aromatic polycarbonate are included.
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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |