US4352907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethyleneterephthalate ternary blends
Assignee: Plastics Engineering Co
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Filing: 1981-02-17
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Granted: 1982-10-05
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Expires: 2001-02-17
Abstract
Abstract The compositions disclosed herein comprise blends of polyethyleneterephthalate (PET) having improved impact strength and heat resistance without any sacrifice of other properties such as flexural strength, humidity resistance, low mold shrinkage, etc. These compositions comprise ternary blends of 30-95 percent, preferably 35-95 percent by weight of PET, 1-30 percent, preferably 3-15 percent by weight of an aromatic polycarbonate (PC); and 1-12, preferably 2.5-10 percent of a copolyester of terephthalic acid with ethylene glycol and cyclohexane-1,4-dimethanol.
Inventors
- 👤 Chung J. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:19
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
A polyethylene terephthalate blend having improved toughness in products molded therefrom, comprising a ternary blend comprising: a. 30-95 parts by weight of polyethylene terephthalate having an intrinsic viscosity of 0.7-1.0; b. 1-30 parts by weight of a polycarbonate of a 4,4'-dihydroxy-di(mononuclear aryl)-A compound, wherein the aryl is phenyl, tolyl, xylyl, ethylphenyl or isopropylphenyl and the A radical is --CH 2 , --C 2 H 4 --, --C 3 H 6 --, --C 4 H 8 --, --S-- or --SO 2 --, said polycarbonate having an intrinsic viscosity of 0.45-0.75; and c. 2.5-10 parts by weight of a copolyester of terephthalic acid with 10-90 mole percent of ethylene glycol and 90-10 mole percent of cyclohexane-1,4-dimethanol; the combined weight of said a, b and c totaling 100 parts by weight.
Claim 2
Dependent Claim
128 words
A polyethylene terephthalate blend having improved toughness in products molded therefrom, comprising a ternary blend comprising: a. 30-95 parts by weight of polyethylene terephthalate having an intrinsic viscosity of 0.7-1.0; b. 1-30 parts by weight of a polycarbonate of a 4,4'-dihydroxy-di(mononuclear aryl)-A compound, wherein the aryl is phenyl, tolyl, xylyl, ethylphenyl or isopropylphenyl and the A radical is --CH 2 , --C 2 H 4 --, --C 3 H 6 --, --C 4 H 8 --, --S-- or --SO 2 --, said polycarbonate having an intrinsic viscosity of 0.45-0.75; and c. 2.5-10 parts by weight of a copolyester of terephthalic acid with 10-90 mole percent of ethylene glycol and 90-10 mole percent of cyclohexane-1,4-dimethanol; the combined weight of said a, b and c totaling 100 parts by weight.
Claim 3
Dependent Claim
16 words
The blend of claim 1, in which said polyethylene terephthalate has a crytallinity of 5-70 percent.
Claim 4
Dependent Claim
30 words
The blend of claim 1, in which said polyethylene terephthalate comprises 35-95 parts by weight, said polycarbonate comprises 3-15 parts by weight and said copolyester comprises 2-20 parts by weight.
Claim 5
Dependent Claim
19 words
The blend of any of claims 1, 2 or 3 in which said polycarbonate comprises a polycarbonate of 4,4'-dihydroxydiphenyl-2,2-propane.
Claim 6
Dependent Claim
22 words
The blend of claim 4, in which said copolyester comprises 20-80 molar percent of ethylene glycol and 20-80 molar percent of cyclohexane-1,4-dimethanol.
Claim 7
Dependent Claim
19 words
The blend of claim 1, 2 or 3 in which said polyethylene terephthalate has a crystallinity of 15-50 percent.
Claim 8
Dependent Claim
20 words
The blend of any of claims 1, 2 or 3, in which said crystallinity is in the range of 30-50%.
Claim 9
Dependent Claim
44 words
A mixture of the blend of any of claims 1, 2 or 3, which also contains 5-50 percent by weight of a filler selected from the class of fiberglass, mica and amorphous silica, based on the combined weight of said blend and said fiberglass.
Claim 10
Dependent Claim
11 words
A mixture of claim 8, in which said filler is fiberglass.
Claim 11
Dependent Claim
14 words
A mixture of claim 9, which contains 20-50 percent by weight of said fiberglass.
Claim 12
Dependent Claim
14 words
A molded product of any of the blends of claim 1, 2 or 3.
Claim 13
Dependent Claim
10 words
A molded product of claim 11, produced by injection molding.
References Cited (Backward Citations)
US3651172A
Cited
US4113692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |