US4425457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High gloss polyethylene terephthalate reinforced resin compositions
Assignee: Celanese Corp
•
Filing: 1981-09-28
•
Granted: 1984-01-10
•
Expires: 2001-09-28
Abstract
Abstract Polyethylene terephthalate resin compositions are provided containing fillers; reinforcing agents; or blends of such fillers and agents and selected alkali metal salts having anions which are oxides of Group IV of the periodic table preferably carbonates and bicarbonates. Articles molded from these compositions have high gloss surfaces and heat deflection temperatures when molded at temperatures below 110 DEG C. even without a precompounding drying stage.
Inventors
- 👤 John Christiansen
- 👤 Shau-Zou Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:12
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08K; C08K3/00; C08K3/10; C08K3/105; C08K3/18; C08K3/24; C08K3/26
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
92 words
A composition consisting essentially of: a. from about 40 to about 95% by weight of polyethylene terephthalate having an inherent viscosity of at least 0.4; b. from about 4 to about 65% by weight of a substance selected from the group consisting of a reinforcing agent; a filler material; and a blend of a reinforcing agent and filler material; and c. from about 0.1 to about 25% by weight of an alkali metal salt having an anion selected from the group consisting of an oxide of germanium, tin, lead and combinations thereof.
Claim 2
Dependent Claim
92 words
A composition consisting essentially of: a. from about 40 to about 95% by weight of polyethylene terephthalate having an inherent viscosity of at least 0.4; b. from about 4 to about 65% by weight of a substance selected from the group consisting of a reinforcing agent; a filler material; and a blend of a reinforcing agent and filler material; and c. from about 0.1 to about 25% by weight of an alkali metal salt having an anion selected from the group consisting of an oxide of germanium, tin, lead and combinations thereof.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the reinforcing material is glass fiber.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein the alkali metal salt cation is selected from the group consisting of lithium, sodium and potassium.
Claim 5
Dependent Claim
13 words
The composition of claim 1 wherein the alkali metal salt cation is sodium.
Claim 6
Dependent Claim
18 words
The composition of claim 1 which contains additionally from about 0.5 to 20 weight percent of a plasticizer.
Claim 7
Dependent Claim
109 words
The composition of claim 8 wherein the plasticizer is selected from the group consisting of a. esters of an aromatic carboxylic acid of 7-11 carbon atoms containing at least one carboxyl group per aromatic nucleus with an alcohol selected from those of the formula (HOCH 2 --) x --R' wherein x is 1, 2 or 3 and R' is a hydrocarbon radical of 2-15 carbon atoms or those of the formula HO--(R"O--) y --R"' where y is a cardinal number between 1 and 15, R" is a hydrocarbon radical of 2-15 carbon atoms and R"' is --H or a hydrocarbon radical of 2-20 carbon atoms, and b. a polyglycol.
Claim 8
Dependent Claim
21 words
The composition of claim 6 wherein the plasticizer is selected from the group consisting of neopentylglycol dibenzoate, benzophenone and a polyglycol.
Claim 9
Dependent Claim
30 words
The composition of claim 1 comprising in addition a flame retardant additive in a minor proportion but in an amount at least sufficient to render the composition nonburning or self-extinguishing.
Claim 10
Dependent Claim
15 words
The flame retarded composition of claim 8 whereby said resinous combination is non-dripping when burning.
Claim 11
Independent Claim
150 words
A method of producing molded, reinforced polyethylene terephthalate articles which comprises: (1) employing a polyethylene terephthalate resin composition consisting essentially of: (a) from about 40 to about 95% by weight of polyethylene terephthalate having an inherent viscosity of at least 0.4; (b) from about 4 to about 65% by weight of a substance selected from the group consisting of a reinforcing agent; a filler material; and a blend of a reinforcing agent and filler material; and (c) from about 0.1 to about 25% by weight of an alkali metal salt having an anion which is an oxide of an element from Group IV of the periodic table; and (2) molding said resin composition at a temperature between about 70° and about 110° C. sufficient to produce a molded polyethylene terephthalate article having a heat distortion temperature of at least 220° C. and a gloss value of at least about 15.
Claim 12
Independent Claim
150 words
A method of producing molded, reinforced polyethylene terephthalate articles which comprises: (1) employing a polyethylene terephthalate resin composition consisting essentially of: (a) from about 40 to about 95% by weight of polyethylene terephthalate having an inherent viscosity of at least 0.4; (b) from about 4 to about 65% by weight of a substance selected from the group consisting of a reinforcing agent; a filler material; and a blend of a reinforcing agent and filler material; and (c) from about 0.1 to about 25% by weight of an alkali metal salt having an anion which is an oxide of an element from Group IV of the periodic table; and (2) molding said resin composition at a temperature between about 70° and about 110° C. sufficient to produce a molded polyethylene terephthalate article having a heat distortion temperature of at least 220° C. and a gloss value of at least about 15.
Claim 13
Dependent Claim
23 words
The method of claim 10 wherein the resin composition is dried prior to being compounded and prior to being employed in the method.
Claim 14
Dependent Claim
12 words
The method of claim 10 wherein the reinforcing material is glass fiber.
Claim 15
Dependent Claim
22 words
The method of claim 10 wherein the alkali metal salt cation is selected from the group consisting of lithium, sodium and potassium.
Claim 16
Dependent Claim
13 words
The method of claim 10 wherein the alkali metal salt cation is sodium.
Claim 17
Dependent Claim
28 words
The method of claim 10 wherein the anion of the alkali metal salt is selected from the group consisting of oxides of the elements of carbon and silicon.
Claim 18
Dependent Claim
23 words
The method of claim 10 wherein the anions of the alkali metal salts are selected from the group consisting of carbonate and bicarbonate.
Claim 19
Dependent Claim
22 words
The method of claim 10 wherein the alkali metal salt is selected from the group consisting of sodium bicarbonate and sodium carbonate.
Claim 20
Dependent Claim
18 words
The method of claim 10 which contains additionally from about 0.5 to 20 weight percent of a plasticizer.
Claim 21
Dependent Claim
109 words
The method of claim 18 wherein the plasticizer is selected from the group consisting of (a) esters of an aromatic carboxylic acid of 7-11 carbon atoms containing at least one carboxyl group per aromatic nucleus with an alcohol selected from those of the formula (HOCH 2 --) x --R' wherein x is 1, 2 or 3 and R' is a hydrocarbon radical of 2-15 carbon atoms or those of the formula HO--(R"O--) y --R"' where y is a cardinal number between 1 and 15, R" is a hydrocarbon radical of 2-15 carbon atoms and R"' is --H or a hydrocarbon radical of 2-20 carbon atoms, and (b). a polyglycol.
Claim 22
Dependent Claim
21 words
The method of claim 19 wherein the plasticizer is selected from the group consisting of neopentylglycol dibenzoate, benzophenone and a polyglycol.
Claim 23
Dependent Claim
30 words
The method of claim 10 comprising in addition a flame retardant additive in a minor proportion but in an amount at least sufficient to render the composition non-burning or self-extinguishing.
Claim 24
Dependent Claim
13 words
The method of claim 21 whereby said resinous combination is non-dripping when burning.
References Cited (Backward Citations)
US3230184A
Cited
US3328339A
Cited
US3368995A
Cited
GB1104089A
Cited
US3565852A
Cited
US3629366A
Cited
US3487041A
Cited
US3547872A
Cited
US3578623A
Cited
US3547873A
Cited
US3516957A
Cited
US3673144A
Cited
US3654234A
Cited
US3595818A
Cited
US3624041A
Cited
US3814725A
Cited
US3859246A
Cited
US3575931A
Cited
US3673139A
Cited
US3953394A
Cited
US3953394B1
Cited
US3764576A
Cited
US3821156A
Cited
US4016112A
Cited
US3965064A
Cited
US3889039A
Cited
US4102853A
Cited
US4086212A
Cited
US4028289A
Cited
US4122047A
Cited
GB2015014B
Cited
US4172824A
Cited
US4220735A
Cited
DE3000855A1
Cited
US4212791A
Cited
US4351758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |