US3966655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polyester imide dispersions
Assignee: BASF SE
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Filing: 1974-10-10
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Granted: 1976-06-29
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Expires: 1994-10-10
Abstract
Abstract Aqueous polyester imide dispersions are prepared by allowing molten polyester imide to solidify and then comminuting it in the dry state to a particle size of 100 μm or less, whereupon the particles are milled in water to a particle size of less than 5 μum. The dispersions may be used for the manufacture of heat-resistant bonds and impregnations and for electrical insulation of metallic conductors. m.
Inventors
- 👤 Jenoe Kovacs
- 👤 Hans Jung
- 👤 Matthias Marx
- 👤 Herbert Spoor
- 👤 Wilfried Roschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/05; C08L; C08L79/00; C08L79/04; C08L79/08; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
A process for the manufacture of an aqueous polyester imide dispersion containing 20 to 60% by weight of said polyester imide in the form of solid particles having a diameter of less than 5 μm, said process comprising the steps of solidifying a composition consisting essentially of a molten polyester imide, comminuting the solid polyester imide in the dry state to particle sizes of about 10 to 100 μm at temperatures of less than 100°C, and thereafter milling the comminuted particles in water at temperatures of less than 80°C to a diameter of less than 5 μm, more than 80% of the particles having a diameter of less than 1 μm.
Claim 2
Dependent Claim
111 words
A process for the manufacture of an aqueous polyester imide dispersion containing 20 to 60% by weight of said polyester imide in the form of solid particles having a diameter of less than 5 μm, said process comprising the steps of solidifying a composition consisting essentially of a molten polyester imide, comminuting the solid polyester imide in the dry state to particle sizes of about 10 to 100 μm at temperatures of less than 100°C, and thereafter milling the comminuted particles in water at temperatures of less than 80°C to a diameter of less than 5 μm, more than 80% of the particles having a diameter of less than 1 μm.
Claim 3
Dependent Claim
47 words
A process as claimed in claim 1, wherein said milling in water of the comminuted polyester imide having a particle size of about 10 to 100 μm is effected in a dispersing machine containing milling elements of high local energy densities at temperatures of less than 40°C.
Claim 4
Dependent Claim
53 words
A process as claimed in claim 1, wherein milling of the comminuted polyester imide in water is effected in a dispersing machine having spherical milling elements of a diameter of from 0.2 to 8 mm, said milling elements being accelerated by additional stirring units having a peripheral velocity of more than 10 m/sec.
Claim 5
Dependent Claim
75 words
A process as claimed in claim 1, wherein the polyester imides are condensates of aromatic dicarboxylic acids and polyhydric alcohols and contain from 10 to 50% by weight of a reaction product of 2 moles of a cyclic anhydride of an aromatic tricarboxylic acid or tetracarboxylic acid having carboxyl groups in the ortho position and 1 mole of a diprimary amine or a compound containing 1 primary amino group and 1 hydroxyl or carboxyl group.
Claim 6
Dependent Claim
35 words
A process as claimed in claim 1, wherein the particles are milled in water to a particle diameter of from 0.05 to 1.5 μm, more than 90% of the particles being smaller than 1 μm.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 1, wherein the aqueous dispersion contains from 25 to 45% by weight of polyester imide.
Claim 8
Dependent Claim
58 words
An aqueous polyester imide dispersion obtained by the process of claim 1 and consisting essentially of water and 20 to 60% by weight, with reference to the dispersion, of the polyester imide in the form of solid particles having a particle size of less than 5 μm, more than 80% of the particles being smaller than 1 μm.
Claim 9
Dependent Claim
53 words
A dispersion as claimed in claim 7 which contains as additives from 0.1 to 10% by weight of water-soluble dispersing agents, from 0.2 to 5% by weight of esterification catalysts, from 0.1 to 10% by weight of water-soluble flow promoters and up to 25% weight of fillers, the percentages being based on solids.
Claim 10
Dependent Claim
23 words
A dispersion as claimed in claim 7 containing from about 0.1 to 6% by weight of a water-soluble, high molecular weight dispersing agent.
Claim 11
Dependent Claim
42 words
A dispersion as claimed in claim 9 wherein said dispersing agent is selected from the group consisting of polyvinyl pyrrolidone, polyvinylalcohols containing up to 30% residual acetate groups, copolymers of vinyl pyrrolidone and vinyl propionate and copolymers of acrylic acid and acrylonitrile.
Claim 12
Dependent Claim
24 words
A dispersion as claimed in claim 7 wherein said polyester imide is based upon ethylene glycol, trishydroxyethyl isocyanurate, terephthalic acid, trimellitic anhydride and 4,4'-diaminodiphenylmethane.
Claim 13
Dependent Claim
24 words
A process as claimed in claim 1 wherein said polyester imide is based upon ethylene glycol, trishydroxyethyl isocyanurate, terephthalic acid, trimellitic anhydride and 4,4'-diaminodiphenylmethane.
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 |