US3966671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester composition
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1975-01-27
•
Granted: 1976-06-29
•
Expires: 1995-01-27
Abstract
Abstract Glass-filled compositions containing saturated thermoplastic polyesters and aliphatic carboxyl-containing materials of low molecular weight having shear-dependent melt viscosity characteristics.
Inventors
- 👤 Clive Percy Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:46
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; Y; Y10; Y10S; Y10S260/00; Y10S260/35
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
A reinforced polyester composition comprising a crystalline thermoplastic linear polyester, 2 to 80 percent by weight of the composition of a reinforcing filler and sufficient of an aliphatic monobasic carboxylic acid or a salt thereof containing 1 to 8 carbon atoms to increase the melt viscosity of the composition under low shear conditions.
Claim 2
Dependent Claim
53 words
A reinforced polyester composition comprising a crystalline thermoplastic linear polyester, 2 to 80 percent by weight of the composition of a reinforcing filler and sufficient of an aliphatic monobasic carboxylic acid or a salt thereof containing 1 to 8 carbon atoms to increase the melt viscosity of the composition under low shear conditions.
Claim 3
Dependent Claim
25 words
A reinforced composition according to claim 1 in which the reinforcing filler is selected from the group consisting of glass fibre, ballotini, mica and asbestos.
Claim 4
Dependent Claim
28 words
A composition according to claim 1 in which the concentration of aliphatic carboxylic acid or salt thereof is from 0.1 to 2.0 percent by weight of the composition.
Claim 5
Dependent Claim
34 words
A composition according to claim 1 in which the thermoplastic linear polyester is a polymer in which at least 80 percent by weight of the units in the polymer chain are tetramethylene terephthalate units.
Claim 6
Dependent Claim
44 words
A composition according to claim 1 containing a sufficient concentration of fire retardant additives to render the composition self-extinguishing according to Underwriters Laboritories Test UL 94 and sufficient of the aliphatic carboxylic acid or salt thereof to render the composition non-dripping in said test.
Claim 7
Dependent Claim
23 words
A composition according to claim 5 containing from 3 to 20 percent by weight of the composition of a brominated fire retardant additive.
Claim 8
Dependent Claim
26 words
A composition according to claim 6 which included from 2 to 10 percent by weight of the composition of a compound of arsenic, antimony or bismuth.
Claim 9
Independent Claim
59 words
A method of increasing the melt viscosity of reinforced polyester compositions under low shear conditions which comprises adding to a crystalline thermoplastic linear polyester and reinforcing filler composition, an aliphatic monobasic carboxylic acid or a salt thereof containing 1 to 8 carbon atoms in an amount sufficient to increase the melt viscosity of said composition under low shear conditions.
Claim 10
Independent Claim
59 words
A method of increasing the melt viscosity of reinforced polyester compositions under low shear conditions which comprises adding to a crystalline thermoplastic linear polyester and reinforcing filler composition, an aliphatic monobasic carboxylic acid or a salt thereof containing 1 to 8 carbon atoms in an amount sufficient to increase the melt viscosity of said composition under low shear conditions.
Claim 11
Dependent Claim
27 words
A method according to claim 8, wherein said acid or salt thereof is added in an amount from 0.1 to 2.0 percent by weight of said composition.
Claim 12
Dependent Claim
24 words
A method according to claim 9 wherein said acid or salt thereof is selected from the group consisting of sodium acetate and potasium acetate.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |