US4137380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester granules and process
Assignee: Dulux Australia Ltd
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Filing: 1974-12-17
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Granted: 1979-01-30
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Expires: 1994-12-17
Abstract
Abstract Aqueous slurries of vesiculated cross-linked polyester resin granules which show a shrinkage of less than 5% on drying are prepared by a double-emulsion process in the presence of polyamine having a pKa value of 8.5-10.5 at a concentration of 0.3 to 1.4 amine groups per carboxyl group of the polyester, the acid value of which is limited to 10-45 mgm KOH per gm. The granules are of particular use as opacifying matting agents in latex paints and avoid the defect observed hitherto of cracking at high film builds.
Inventors
- 👤 Raymond H. Gunning
- 👤 Bruce C. Henshaw
- 👤 Frederick J. Lubbock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C09; C09D; C09D7/00; C09D7/40; C09D7/42; C08J2367/00; C08J2367/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
An aqueous slurry of vesiculated cross-linked polyester resin granules which are dimensionally stable in that the shrinkage of a water-wet granule on drying out and measuring by microscope examination is less than 5% and which have a vesicle volume of 65-80% of the total granule volume, the cross-linked polyester being the product of a carboxylated unsaturated polyester resin which has an acid value of 10-45 mgm KOH per gm cross-linked with ethylenically unsaturated monomer copolymerisable therewith and which has a solubility in water at 20° C of less than 5% by weight, said slurry also including a water-soluble polyamine which contains at least three amine groups per molecule and which has a dissociation constant in water (pKa value) of 8.5-10.5, at a concentration such that there are 0.3 to 1.4 amine groups present per polyester resin carboxyl group before said resin in crosslinked.
Claim 2
Dependent Claim
143 words
An aqueous slurry of vesiculated cross-linked polyester resin granules which are dimensionally stable in that the shrinkage of a water-wet granule on drying out and measuring by microscope examination is less than 5% and which have a vesicle volume of 65-80% of the total granule volume, the cross-linked polyester being the product of a carboxylated unsaturated polyester resin which has an acid value of 10-45 mgm KOH per gm cross-linked with ethylenically unsaturated monomer copolymerisable therewith and which has a solubility in water at 20° C of less than 5% by weight, said slurry also including a water-soluble polyamine which contains at least three amine groups per molecule and which has a dissociation constant in water (pKa value) of 8.5-10.5, at a concentration such that there are 0.3 to 1.4 amine groups present per polyester resin carboxyl group before said resin in crosslinked.
Claim 3
Dependent Claim
11 words
An aqueous slurry according to claim 1 including a dispersion stabiliser.
Claim 4
Dependent Claim
13 words
An aqueous slurry according to claim 2 wherein the granules include pigment therein.
Claim 5
Dependent Claim
18 words
An aqueous slurry according to claim 2 wherein the stabiliser is an 85-90% hydrolysed grade of poly(vinyl acetate).
Claim 6
Dependent Claim
23 words
An aqueous slurry according to claim 4 wherein the carboxylated unsaturated polyester resin has an acid value of 17-25 mgm KOH per gm.
Claim 7
Dependent Claim
25 words
An aqueous slurry according to claim 5 wherein the ethylenically unsaturated monomer is at least one material selected from styrene, vinyl toluene and methy methacrylate.
Claim 8
Dependent Claim
19 words
An aqueous slurry according to claim 6 wherein the ethylenically unsaturated monomer comprises at least 50% by weight styrene.
References Cited (Backward Citations)
CA856861A
Cited
CA877357A
Cited
USRE27444E
Cited
US3244772A
Cited
US3255127A
Cited
US3442842A
Cited
US3669911A
Cited
US3666697A
Cited
US3740255A
Cited
US3740353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |