Patent US3931082A successfully refreshed from Google Patents.
US3931082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microcrystalline polyesters and dispersions thereof
Assignee: FMC Corp
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Filing: 1974-04-23
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Granted: 1976-01-06
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Expires: 1994-04-23
Abstract
Abstract Colloidally dispersible microcrystalline polyesters are prepared by a hydrolytic removal of amorphous regions in synthetic, linear polyesters followed by a mechanical disintegration of the resulting aggregated microcrystals to produce discrete microcrystalline particles at least 5% by weight having a particle size not exceeding 1 micron. The microcrystalline polyesters exhibit a sharp X-ray diffraction pattern and distinctly modified thermal behavior as compared to the parent or precursor polyester resin.
Inventors
- 👤 Mamerto M. Cruz, Jr.
- 👤 Nicholas Z. Erdi
- 👤 Orlando A. Battista
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/88
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
A process for separating a finely divided, microcrystalline polyester particulate product having two separate melting point ranges from a fiber forming, synthetic, linear polyester having an inherent crystalline-amorphous morphology and a single melting point range comprising hydrolyzing the polyester with a basic solution comprising an aqueous solution of a lower aliphatic amine or ammonia whereby ester groups in the amorphous regions are preferentially hydrolyzed and solubilized without substantial dissolution of the crystalline regions thereby forming a polyester material having a terminal amide group and having a higher crystallinity than the precursor polyester, removing solubilized amorphous regions, recovering an insoluble microcrystalline polyester having a terminal amide group and two separate melting point ranges and then mechanically disintegrating the recovered microcrystalline polyester until at least 5% by weight has a particle size not exceeding 1 micron.
Claim 2
Dependent Claim
134 words
A process for separating a finely divided, microcrystalline polyester particulate product having two separate melting point ranges from a fiber forming, synthetic, linear polyester having an inherent crystalline-amorphous morphology and a single melting point range comprising hydrolyzing the polyester with a basic solution comprising an aqueous solution of a lower aliphatic amine or ammonia whereby ester groups in the amorphous regions are preferentially hydrolyzed and solubilized without substantial dissolution of the crystalline regions thereby forming a polyester material having a terminal amide group and having a higher crystallinity than the precursor polyester, removing solubilized amorphous regions, recovering an insoluble microcrystalline polyester having a terminal amide group and two separate melting point ranges and then mechanically disintegrating the recovered microcrystalline polyester until at least 5% by weight has a particle size not exceeding 1 micron.
Claim 3
Dependent Claim
19 words
A process as defined in claim 1 wherein a fiber forming polyester is annealed prior to the hydrolyzing treatment.
Claim 4
Dependent Claim
25 words
A process as defined in claim 1 wherein the fiber forming polyester is poly(ethylene terephthalate) and the basic solution is an aqueous solution of ammonia.
Claim 5
Dependent Claim
19 words
A process as defined in claim 1 wherein the fiber forming polyester is poly(ester of 4,4'-isopropylidenediphenol with carbonic acid).
Claim 6
Dependent Claim
129 words
An article of manufacture comprising a finely divided, mechanically disintegrated, microcrystalline, synthetic, linear polyester product separated from a fiber forming, synthetic, linear polyester having an inherent crystalline-amorphous morphology and a single melting point range, the microcrystalline polyester product, in contrast to the fiber forming polyester, having a terminal amide group being substantially free of amorphous portions of the polyester chains, exhibiting a sharper x-ray diffraction pattern, having a lower molecular weight, having two separate melting point ranges, consisting of particles at least 5% by weight of which have a particle size not exceeding about 1 micron and being further characterized in forming a stable, colloidal soliquoid in liquid media having a minimal swelling action on the microcrystals which may solvate the surfaces without destroying the interior of the microcrystals.
Claim 7
Dependent Claim
129 words
An article of manufacture comprising a finely divided, mechanically disintegrated, microcrystalline, synthetic, linear polyester product separated from a fiber forming, synthetic, linear polyester having an inherent crystalline-amorphous morphology and a single melting point range, the microcrystalline polyester product, in contrast to the fiber forming polyester, having a terminal amide group being substantially free of amorphous portions of the polyester chains, exhibiting a sharper x-ray diffraction pattern, having a lower molecular weight, having two separate melting point ranges, consisting of particles at least 5% by weight of which have a particle size not exceeding about 1 micron and being further characterized in forming a stable, colloidal soliquoid in liquid media having a minimal swelling action on the microcrystals which may solvate the surfaces without destroying the interior of the microcrystals.
Claim 8
Dependent Claim
51 words
An article of manufacture as defined in claim 5 wherein the mechanically disintegrated polyester product consists of particles at least 95% by weight of which have a particle size not exceeding about one micron and about at least 5% by weight of which have a particle size not exceeding 0.1 micron.
Claim 9
Dependent Claim
47 words
An article of manufacture as defined in claim 5 which is in the form of a soliquoid of the mechanically disintegrated polyester product in a liquid media having a minimal swelling action on the microcrystals which may solvate the surfaces without destroying the interior of the microcrystals.
Claim 10
Dependent Claim
47 words
An article of manufacture as defined in claim 5 which is in the form of a soliquoid of the mechanical disintegrated polyester product in an aqueous media having a minimal swelling action on the microcrystals which may solvate the surfaces without destroying the interior of the microcrystals.
Claim 11
Dependent Claim
25 words
An article of manufacture as defined in claim 5 which is in the form of a soliquoid of the mechanically disintegrated polyester product in water.
Claim 12
Dependent Claim
48 words
An article of manufacture as defined in claim 5 which is in the form of a soliquoid of the mechanically disintegrated polyester product in an organic liquid media having a minimal swelling action on the microcrystals which may solvate the surfaces without destroying the interior of the microcrystals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |