Patent US2817426A successfully refreshed from Google Patents.
US5082897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer blends of polycarbonate, pctg and abs
Assignee: Bayer Antwerpen NV
•
Filing: 1989-12-15
•
Granted: 1992-01-21
•
Expires: 2009-12-15
Abstract
Abstract Polymer blends useful as thermoplastic molding resins comprise polycarbonate, PCTG and ABS or ASA and exhibit enhanced moldability, heat resistance and thick section toughness not available in binary blends of the components.
Inventors
- 👤 Kishore Udipi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:39
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08L69/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
A polymer blend useful as a thermoplastic injection molding resin consisting essentially of: (A) at least 10 percent by weight PC which is an aromatic polycarbonate derived from the reaction of bisphenol-A and phosgene, (B) at least 10 percent by weight of PCTG which is an amorphous polyester of terephthalic acid and a mixture of predominately 1,4-cyclohexanedimethanol, and a lesser amount of ethylene glycol and (C) at least 10 percent by weight ABS which is a polymer of butadiene or mixtures of butadiene and styrene or acrylonitrile grafted with styrene and acrylonitrile monomers; wherein said blend has the following properties: (1) melt flow into a mold (Spiral Flow) as measured by the procedure for Spiral Flow of at least 25 centimeters, (2) heat distortion temperature underload (HDTUL) as measured ASTM D648 of at least 75° C., and (3) thick section notched Izod impact resistance (IZOD-1/4) as measured by ASTM 256-56 on a 6.4 mm thick notched specimen at 23° C. of at least 140 Joules/meter.
Claim 2
Dependent Claim
165 words
A polymer blend useful as a thermoplastic injection molding resin consisting essentially of: (A) at least 10 percent by weight PC which is an aromatic polycarbonate derived from the reaction of bisphenol-A and phosgene, (B) at least 10 percent by weight of PCTG which is an amorphous polyester of terephthalic acid and a mixture of predominately 1,4-cyclohexanedimethanol, and a lesser amount of ethylene glycol and (C) at least 10 percent by weight ABS which is a polymer of butadiene or mixtures of butadiene and styrene or acrylonitrile grafted with styrene and acrylonitrile monomers; wherein said blend has the following properties: (1) melt flow into a mold (Spiral Flow) as measured by the procedure for Spiral Flow of at least 25 centimeters, (2) heat distortion temperature underload (HDTUL) as measured ASTM D648 of at least 75° C., and (3) thick section notched Izod impact resistance (IZOD-1/4) as measured by ASTM 256-56 on a 6.4 mm thick notched specimen at 23° C. of at least 140 Joules/meter.
Claim 3
Dependent Claim
22 words
A blend according to claim 1 consisting essentially of at least 20 percent by weight of each of PC, PCTG and ABS.
Claim 4
Dependent Claim
26 words
A blend according to claim 1 consisting essentially of sufficient amounts of PC, PCTG, and ABS so that said Spiral Flow is at least 30 centimeters.
Claim 5
Dependent Claim
25 words
A blend according to claim 1 consisting essentially of sufficient amounts of PC, PCTG and ABS so that said HDTUL is at least 80° C.
Claim 6
Dependent Claim
26 words
A blend according to claim 1 consisting essentially of sufficient amounts of PC, and PCTG and ABS so that said IZOD-1/4 is at least 300 Joules/meter.
Claim 7
Dependent Claim
34 words
A blend according to claim 1 consisting essentially of at least 20 percent by weight ABS and having a Spiral Flow of at least 30 centimeters and an IZOD-1/4 of at least 300 Joules/meter.
Claim 8
Dependent Claim
41 words
A blend according to claim 1 consisting essentially of at least 30 percent by weight PC and having a Spiral Flow of at least 30 centimeters, an IZOD-1/4 of at least 500 Joules/meter and an HDTUL of at least 80° C.
Claim 9
Dependent Claim
56 words
A blend according to claim 1 consisting essentially of at least 30 percent by weight PC, at least 30 percent by weight PCTG and at least 30 percent by weight ABS and having a Spiral Flow of at least 30 centimeters, an HDUTUL of at least 80° C. and an IZOD-1/4 of at least 500 Joules/meter.
References Cited (Backward Citations)
US3864428A
Cited
US4111895A
Cited
US4096202A
Cited
US4096202B1
Cited
US4180494A
Cited
US4257937B1
Cited
US4257937A
Cited
US4220735A
Cited
US4239676A
Cited
US4264487A
Cited
EP0108996A1
Cited
EP0111810A2
Cited
US4786692A
Cited
US4554314A
Cited
US4604423A
Cited
EP0175220A2
Cited
US4654400A
Cited
US4628074A
Cited
US4902737A
Cited
EP0273151A2
Cited
US4775717A
Cited
US4897448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |