US4440889A
Expired / Lapsed
US
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Polyethylene terephthalate molding compositions
Assignee: Honeywell International Inc
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Filing: 1982-06-23
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Granted: 1984-04-03
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Expires: 2002-06-23
Abstract
Abstract Polyethylene terephthalate molding compositions are provided which comprise a polyethylene terephthalate having an inherent viscosity of at least 0.4, a plasticizer, a lubricating polymer, a nucleating agent, a reinforcing agent or mixture of reinforcing agent and filler, and a molecular weight reducing agent for the polyethylene terephthalate. The molding compositions can be injection molded utilizing mold temperatures below 100° C. (e.g., 60°-90° C.). The molded compositions exhibit an excellent balance of properties such as tensile strength, flex modulus, heat distortion temperature and impact strength.
Inventors
- 👤 William L. Hergenrother
- 👤 John M. Doshak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:57
CPC Classifications
C; C08; C08K; C08K13/00; C08K13/02; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
214 words
Polyethylene terephthalate molding compositions which can be molded at temperatures of 100° C. or less comprising: (a) from about 40 to about 70 parts by weight per 100 parts of total composition of a polyethylene terephthalate having an intrinsic viscosity of 0.4 to 1.0 dl/g as measured at 25° C. in a 1:1: mixture of phenol and tetrachloroethane; (b) from about 0.5 to about 5.0 parts by weight per 100 parts by weight of total composition of a plasticizer selected from the group consisting of benzoate esters of polyols, phthalate esters and phosphate esters; (c) from about 0.5 to about 10.0 parts by weight per 100 parts by weight of total composition of a lubricating polymer; (d) from about 0.1 to about 5.0 parts by weight per 100 parts by weight of total composition of a nucleating agent; (e) from about 20 to about 60 parts by weight per 100 parts by weight of total composition of a reinforcing material or mixture of reinforcing material and filler; (f) from about 0.01 to about 1.0 parts by weight per 100 parts by weight of total composition of a molecular weight reducing agent for said polyethylene terephthalate, wherein said molecular weight reducing agent is selected from the group consisting of benzoic acid, neopentyl glycol and water.
Claim 2
Dependent Claim
214 words
Polyethylene terephthalate molding compositions which can be molded at temperatures of 100° C. or less comprising: (a) from about 40 to about 70 parts by weight per 100 parts of total composition of a polyethylene terephthalate having an intrinsic viscosity of 0.4 to 1.0 dl/g as measured at 25° C. in a 1:1: mixture of phenol and tetrachloroethane; (b) from about 0.5 to about 5.0 parts by weight per 100 parts by weight of total composition of a plasticizer selected from the group consisting of benzoate esters of polyols, phthalate esters and phosphate esters; (c) from about 0.5 to about 10.0 parts by weight per 100 parts by weight of total composition of a lubricating polymer; (d) from about 0.1 to about 5.0 parts by weight per 100 parts by weight of total composition of a nucleating agent; (e) from about 20 to about 60 parts by weight per 100 parts by weight of total composition of a reinforcing material or mixture of reinforcing material and filler; (f) from about 0.01 to about 1.0 parts by weight per 100 parts by weight of total composition of a molecular weight reducing agent for said polyethylene terephthalate, wherein said molecular weight reducing agent is selected from the group consisting of benzoic acid, neopentyl glycol and water.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein said benzoate ester is neopentyl glycol dibenzoate.
Claim 4
Dependent Claim
27 words
The composition of claim 1 wherein said lubricating polymer is a sodium or zinc salt of a copolymer of an alpha-olefin and an alpha-beta-ethylenically unsaturated carboxylic acid.
Claim 5
Dependent Claim
23 words
The composition of claim 3 wherein said lubricating polymer is the sodium or zinc salt of a copolymer of ethylene and methacrylic acid.
Claim 6
Dependent Claim
19 words
The composition of claim 1 wherein said nucleating agent is a calcium salt, a zeolite, or a mineral silicate.
Claim 7
Dependent Claim
17 words
The composition of claim 1 wherein said nucleating agent is calcium silicate, calcium fluoride or calcium carbonate.
Claim 8
Dependent Claim
12 words
The composition of claim 1 wherein said reinforcing material is glass fibers.
Claim 9
Dependent Claim
14 words
The composition of claim 1 wherein the molecular weight reducing agent is benzoic acid.
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) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |