US5137688A
Expired / Lapsed
US
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Irradiated articles molded from polycarbonate-polyamide blends
Assignee: SABIC Global Technologies BV
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Filing: 1990-11-29
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Granted: 1992-08-11
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Expires: 2010-11-29
Abstract
Abstract Thermoplastic articles molded from amorphous polyamide and polycarbonate resin blends exhibit improved color when irradiated with ionizing radiation.
Inventors
- 👤 James L. DeRudder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:15
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/04; A61L29/049; A61L27/00; A61L27/14; A61L27/26; C; C08; C08L; C08L69/00; C08L69/005; C08L77/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
46 words
An article of improved color, molded from a thermoplastic molding composition, which comprises; from about 10-90 percent by weight of an aromatic polycarbonate resin; and from about 10-90 percent by weight of an amorphous polyamide resin; said article having been subjected to sterilization by ionizing radiation.
Claim 2
Dependent Claim
46 words
An article of improved color, molded from a thermoplastic molding composition, which comprises; from about 10-90 percent by weight of an aromatic polycarbonate resin; and from about 10-90 percent by weight of an amorphous polyamide resin; said article having been subjected to sterilization by ionizing radiation.
Claim 3
Dependent Claim
22 words
An article of claim 1 wherein the polycarbonate resin contains structural units of the formula: ##STR9## wherein D is divalent aromatic radical.
Claim 4
Dependent Claim
19 words
An article of claim 2 wherein aromatic polycarbonate resin comprises polymers selected from the group consisting of poly(ester-carbonate) polymers.
Claim 5
Dependent Claim
17 words
An article of claim 2 wherein the aromatic polycarbonate is obtained by polymerizing phosgene with 2,2-bis(4-hydroxyphenyl) propane.
Claim 6
Dependent Claim
25 words
An article of claim 4 wherein the aromatic polycarbonate is obtained by polymerizing phosgene with 2,2-bis(4-hydroxyphenol) propane and a mixture of isophthalic and terephthalic acids.
Claim 7
Dependent Claim
17 words
An article of claim 1 wherein the weight ratio of amorphous polyamide to polycarbonate is about 1:1.
Claim 8
Dependent Claim
57 words
An article of claim 1 wherein the amorphous polyamide contains structural units selected from those of the formula: ##STR10## wherein in R 1 and R 2 are different divalent organic radicals selected from the group consisting of C 2 -C 15 alkylene radicals C 3 -C 18 cycloalkylene radicals and C 6 to C 20 arylene radicals.
Claim 9
Dependent Claim
70 words
An article of claim 7 wherein the amorphous polyamide is obtained by polymerization of members selected from the group consisting of (a) terephthalic acid with, trimethylhexamethylene diamine; (b) isophthalic acid with trimethylhexamethylene diamine; (c) adipic acid, azelaic acid and 2,2-bis-(p-aminocycloxyl) propane; (d) terephthalic acid with bis (4-amino cyclohexyl) methane; (e) isophthalic acid with hexamethylenediamine; (f) terephthalic acid/isophthalic acid with hexamethylene diamine, and (g) adipic acid/azelaic acid with diphenyl methane diisocyanate.
Claim 10
Dependent Claim
81 words
An article of claim 1 which further comprises an impact-modifying proportion of a polyamide-polyether block copolymer having recurring chain units of the formula: ##STR11## wherein PA represents a saturated amide sequence formed from a lactam or an amino acid having a hydrocarbon chain containing from 4 to 14 carbon atoms, inclusive, or from a dicarboxylic acid and a diamine wherein both can have from 4 to 40 carbon atoms, inclusive; and PE represents a polyether sequence formed from a polyoxyalkylene glycol.
Claim 11
Dependent Claim
29 words
An article of claim 9 wherein the proportion by weight of the polyoxyalkylene glycol sequence to the total weight of the block copolymer is from 5 to 85 percent.
Claim 12
Dependent Claim
19 words
An article of claim 9 wherein the impact-modifying proportion is from 5 to 30 weight percent of the blend.
Claim 13
Independent Claim
74 words
A method of preparing a thermally molded, sterile, article of improved color which comprises; providing the article molded in a solid form from a blend which comprises; from about 40-60 percent by weight of an aromatic polycarbonate resin; and from about 40-60 percent by weight of an amorphous polyamide resin; sealing the article in a moisture-proof, microorganism-impermeable, ionizing ray-permeable container; and subjecting the sealed-in article to a non-destructive, sterilizing dose of an ionizing ray.
Claim 14
Independent Claim
74 words
A method of preparing a thermally molded, sterile, article of improved color which comprises; providing the article molded in a solid form from a blend which comprises; from about 40-60 percent by weight of an aromatic polycarbonate resin; and from about 40-60 percent by weight of an amorphous polyamide resin; sealing the article in a moisture-proof, microorganism-impermeable, ionizing ray-permeable container; and subjecting the sealed-in article to a non-destructive, sterilizing dose of an ionizing ray.
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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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |