EP0111810A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
High strength, reduced heat distortion temperature thermoplastic composition
Assignee: General Electric Co
•
Filing: 1983-12-05
•
Granted: —
•
Expires: 2003-12-05
Abstract
Abstract 57 New and improved thermoplastic compositions are disclosed comprising a blend of an aromatic polycarbonate and a copolymer derived from a glycol portion comprising 1,4-cyclohexanedimethanol and ethylene glycol present in molar ratios of 1:4 to 4:1 respectively and an acid portion comprising an aromatic dicarboxylic acid selected from terephthalic acid, isophthalic acid, and mixtures thereof. The compositions are compatible with, and advantageously contain impact modifiers and flame retardants. The copolymer of the subject invention has a heat distortion temperature of from 60°C to 70°C. and when incorporated in the thermoplastic compositions of this invention provides polycarbonate-based compositions which exhibit lower heat distortion temperatures while retaining good tensile, flexural and impact strengths. The lower heat distortion temperatures of the compositions permits them to be molded and processed at lower temperatures thereby avoiding the degradation of the materials with concomitant loss in impact strength observed with higher conventional molding temperatures employed with earlier compositions.
Inventors
- 👤 Richard Brian Allen
- 👤 Deborah Lynne Allen
- 👤 Robert Alan Wiercinski
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 10:11
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08L69/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
69 words
A thermoplastic composition comprising: (a) an aromatic carbonate polymer or copolymer: (b) a polyester copolymer derived from a (i) a glycol portion comprising 1,4-cyclohexanedimethanol and ethylene glycol wherein the molar ratio of 1,4-cyclohexanedimethanol to ethylene glycol is from about 1:4 to 4:1; and (ii) an acid portion comprising an aromatic dicarbcxylic acid selected from the group consisting essentially of terephthalic acid, isophthalic acid and mixtures of the two acids.
Claim 2
Dependent Claim
69 words
A thermoplastic composition comprising: (a) an aromatic carbonate polymer or copolymer: (b) a polyester copolymer derived from a (i) a glycol portion comprising 1,4-cyclohexanedimethanol and ethylene glycol wherein the molar ratio of 1,4-cyclohexanedimethanol to ethylene glycol is from about 1:4 to 4:1; and (ii) an acid portion comprising an aromatic dicarbcxylic acid selected from the group consisting essentially of terephthalic acid, isophthalic acid and mixtures of the two acids.
Claim 3
Dependent Claim
19 words
A thermoplastic composition as recited in Claim 1 wherein the aromatic carbonate polymer component (a) is a poly(bisphenol-A carbonate).
Claim 4
Dependent Claim
36 words
A composition as recited in Claim 1 wherein component (a) comprises from 98% to 2% by weight and component (b) comprises from about 2% to 98% by weight, based upon the weight of the overall composition.
Claim 5
Dependent Claim
15 words
A thermoplastic composition as recited in Claim 1 wherein component (b) comprises poly(0.7) ethylene-co-(0.3)-1,4-cyclohexanedimethylene terephthalate).
Claim 6
Dependent Claim
15 words
A thermoplastic composition as recited in Claim 1, wherein component (b) comprises poly(0.65) 1,4-cyclohexanenimethylene-co-(0.35)-ethylene terephthalate.
Claim 7
Dependent Claim
21 words
A thermoplastic composition as recited in Claim 1 further comprising an effective impact strength improving amount of an impact modifying agent.
Claim 8
Dependent Claim
27 words
A thermoplastic composition as recited in Claim 6 wherein said impact modifying agent is a combination of a poly(alkyl acrylate) with an acrylate based core-shell acrylate copolymer.
Claim 9
Dependent Claim
69 words
A thermoplastic composition as recited in Claim 6, wherein said impact modifying agent is a selectively hydrogenated linear, sequential or radial teleblock copolymer of a vinyl aromatic compound (A) n and (A') n and an olefinic elastomer (B) of the A-B-A', A-(BAB) n -A; A(BA) n B; (A) 4 B; B(A) 4 ; or B((AB) n B) 4 type, wherein n is an integer of from 1 to 10.
Claim 10
Dependent Claim
41 words
A thermoplastic composition as recited in Claim 8 wherein in said selectively hydrogenated block copolymer 7 -(A) and (A') are selected from styrene, alpha-methylstyrene; vinyl toluene, vinyl xylene, and vinyl naphthalene and (B) is selected from butadiene, isoprene, 1,3-pentadiene and 2,3-dimethylbutadiene.
Claim 11
Dependent Claim
21 words
A thermoplastic composition as recited in Claim 1 which further comprises an effective flame retardant amount of a flame retardant agent.
Claim 12
Dependent Claim
22 words
A thermoplastic composition as recited in Claim 10 wherein said flame retardant agent comprises poly(tetrabromobisphenol-A/bisphenol-A carbonate) containing 50% by weight tetrabromobisphenol-A units.
Claim 13
Dependent Claim
67 words
A substantially transparent thermoplastic composition comprising: (a) an aromatic carbonate polymer or copolymer; (b) a first polyester copolymer derived from (i) a glycol portion comprising ethylene glycol and 1,4-cyclohexanedimethanol wherein the molar ratio of ethylene glycol to 1,4-cyclohexanedimethanol is from 1:1 to 4:1, and (ii) an acid portion comprising terephthalic acid; and (c) a second polyester copolymer comprising: (i) 1,4-cyclohexanedimethylene units; and (ii) iso- and terephthalate units.
Claim 14
Dependent Claim
67 words
A substantially transparent thermoplastic composition comprising: (a) an aromatic carbonate polymer or copolymer; (b) a first polyester copolymer derived from (i) a glycol portion comprising ethylene glycol and 1,4-cyclohexanedimethanol wherein the molar ratio of ethylene glycol to 1,4-cyclohexanedimethanol is from 1:1 to 4:1, and (ii) an acid portion comprising terephthalic acid; and (c) a second polyester copolymer comprising: (i) 1,4-cyclohexanedimethylene units; and (ii) iso- and terephthalate units.
Claim 15
Dependent Claim
21 words
A substantially transparent thermoplastic composition as recited in Claim 12 wherein the aromatic carbonate polymer component (a) is a poly(bisphenol-A carbonate).
Claim 16
Dependent Claim
21 words
A substantially transparent thermoplastic composition as recited in Claim 12 wherein said first polyester copolymer component (b) comprises poly(0.7) ethylene-co-(0.3)1,4-cyclohexanedimethylene terephthalate.
Claim 17
Dependent Claim
39 words
A substantially transparent thermoplastic composition as recited in Claim 12, wherein in said second copolymer component (c) (ii) comprises a mixture of from 10% to 25% by weight isophthalate units and from 90% to 75% by weight terephthalate units.
Claim 18
Dependent Claim
60 words
A substantially transparent thermoplastic composition as recited in Claim 12 wherein said aromatic polycarbonate, component (a) comprises from about 40% to 60% by weight; said first polyester copolymer component (b) comprises from about 10% to 30% by weight; and said second copolymer, component (c) comprises from about 20% to 40% by weight, based upon the weight of the overall composition.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.