US4212966A
Expired / Lapsed
US
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Process of preparing finely divided thermoplastic resins
Assignee: Millennium Petrochemicals Inc
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Filing: 1979-03-28
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Granted: 1980-07-15
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Expires: 1999-03-28
Abstract
Abstract Powders of thermoplastic resins such as polyethylene homopolymer and ethylene-vinyl acetate copolymer are obtained by agitating molten resin in admixture with water in the presence of a dispersing system comprising a dispersing amount of a surface active agent selected from the group consisting of sulfates, sulfonates, sarcosinates, taurates, isethionates, fatty amido phosphates, fatty amide derivatives, amido amines, higher alkyl amines, substituted imidazolines, substituted betaines, ethoxylated alkylol amides, ethoxylated phenols and ethoxylated fatty ethers in combination with a dispersion promoting amount of strong base. Optionally, the dispersing system can also contain a water-soluble substantially neutral salt to further promote dispersion formation.
Inventors
- 👤 Dorothee M. McClain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:19
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/12; C08J3/16
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
116 words
A process for preparing in a finely divided form a solid organic polymeric thermoplastic resin which comprises: (a) agitating a mixture of the resin while in the molten state, a dispersion-forming amount of water, and a dispersing system comprising a dispersing amount of a surface active agent which is normally incapable of forming a dispersion of said resin in the absence of strong base in combination with a dispersion promoting amount of strong base to provide an aqueous dispersion of the resin said dispersion being formed in the absence of discharge of the hot dispersion through a restricted orifice into a zone of reduced pressure; and, (b) cooling the dispersion to provide solid particles of resin.
Claim 2
Dependent Claim
116 words
A process for preparing in a finely divided form a solid organic polymeric thermoplastic resin which comprises: (a) agitating a mixture of the resin while in the molten state, a dispersion-forming amount of water, and a dispersing system comprising a dispersing amount of a surface active agent which is normally incapable of forming a dispersion of said resin in the absence of strong base in combination with a dispersion promoting amount of strong base to provide an aqueous dispersion of the resin said dispersion being formed in the absence of discharge of the hot dispersion through a restricted orifice into a zone of reduced pressure; and, (b) cooling the dispersion to provide solid particles of resin.
Claim 3
Dependent Claim
46 words
The process of claim 1 wherein the surface active agent is selected from the group consisting of sulfates, sulfonates, sarcosinates, taurates, isethionates, fatty amido phosphates, fatty amide derivatives, amido amines, higher alkyl amines, substituted imidazolines, substituted betaines, ethoxylated alkylol amides, ethoxylated phenols and ethoxylated fatty ethers.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein solid particles of resin produced in step (b) are recovered from the aqueous dispersion.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the resin is a polyolefin.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein the resin is polyethylene or polypropylene homopolymer or copolymer.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the resin is ethylene-ethyl acrylate copolymer.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the resin is ethylene-vinyl acetate copolymer.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein the ethylene constitutes at least about 25% of the copolymer by weight.
Claim 10
Dependent Claim
14 words
The process of claim 1 wherein the strong base is an alkali metal hydroxide.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein the alkali metal hydroxide is sodium hydroxide.
Claim 12
Dependent Claim
21 words
The process of claim 1 wherein the dispersing system further contains a dispersion enhancing amount of a water-soluble substantially neutral salt.
Claim 13
Dependent Claim
12 words
The process of claim 11 wherein the neutral salt is sodium chloride.
Claim 14
Dependent Claim
27 words
The process of claim 2 wherein the sulfate surface active agent is a sodium salt of alkaryl polyether sulfate, sodium lauryl sulfate, or sodium lauryl ether sulfate.
Claim 15
Dependent Claim
29 words
The process of claim 2 wherein the sulfonate surface active agent is a sodium salt of alkaryl polyether sulfonate, sodium salt of alpha olefin sulfonate, or sodium xylene sulfonate.
Claim 16
Dependent Claim
22 words
The process of claim 2 wherein the sarcosinate surface active agent is sodium cocoyl sarcosine, sodium lauroyl sarcosine, or sodium myristoyl sarcosine.
Claim 17
Dependent Claim
28 words
The process of claim 2 wherein the taurate surface active agent is sodium N-cyclohexyl-N-palmitoyltaurate, sodium N-methyl-N-oleoyl taurate, sodium N-methyl-N-myristoyl taurate, sodium N-methyl-N-palmitoyl taurate, or sodium N-coconut acid-N-methyl taurate.
Claim 18
Dependent Claim
28 words
The process of claim 2 wherein the isethionate surface active agent is a coconut oil acid ester of sodium isethionate, or an oleic acid ester of sodium isethionate.
Claim 19
Dependent Claim
19 words
The process of claim 2 wherein the fatty amido phosphate surface active agent is a complex fatty amido phosphate.
Claim 20
Dependent Claim
15 words
The process of claim 2 wherein the fatty amide derivative is N,N-dimethyl lauramide, or N,N-ethylenebisstearamide.
Claim 21
Dependent Claim
17 words
The process of claim 2 wherein the higher alkyl amine surface active agent is an ethoxylated amine.
Claim 22
Dependent Claim
39 words
The process of claim 2 wherein the substituted imidazoline surface active agent is a substituted imidazoline derived from coconut fatty acids, lauric acid, isostearic acid, myristic acid, stearic acid, or oleic acid, or methyl (1) alkylamidoethyl (2) alkylimidazolinium sulfate.
Claim 23
Dependent Claim
52 words
The process of claim 2 wherein the substituted betaine surface active agent is coco betaine, coco amido betaine, fatty sulfobetaine, coco dimethyl ammonium carboxylic acid betaine, stearyl betaine, isostearyl amido betaine, lauryl amido betaine, myristoyl amido betaine, oleoyl amido betaine, oleoyl betaine, palmitoyl amido betaine, stearyl amido betaine or sulfo-coco amide betaine.
Claim 24
Dependent Claim
16 words
The process of claim 2 wherein the ethoxylated alkylol amide surface active agent is oleoyl diethanolamide.
Claim 25
Dependent Claim
17 words
The process of claim 2 wherein the ethoxylated phenol surface active agent is an octylphenoxy polyethoxy ethanol.
Claim 26
Dependent Claim
16 words
The process of claim 2 wherein the ethoxylated fatty ether is a polyoxyethylene (20) stearyl ether.
References Cited (Backward Citations)
US4151134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |