Source: http://www.google.es/patents/US8916640
Timestamp: 2018-01-16 16:01:09
Document Index: 697005518

Matched Legal Cases: ['application No. 200900004', 'application No. 2', 'Application No. 07810210', 'application No. 200780031496', 'application No. 10', 'Application No. 2009103922', 'Application No. 200900004', 'application No. 2009']

Patente US8916640 - Blended polyolefin dispersions - Google Patentes
Blended polyolefin dispersions, including: (A) a liquid; (B) an olefin-based polymer dispersed in the liquid, the dispersed olefin-based polymer having an average particle size ranging from 0.1 to 5 microns; and (C) an alpha-beta unsaturated carboxylic acid-based polymer dispersed in the liquid, the...http://www.google.es/patents/US8916640?utm_source=gb-gplus-sharePatente US8916640 - Blended polyolefin dispersions
Número de publicación US8916640 B2
También publicado como US20080176968
Número de publicación 11897022, 897022, US 8916640 B2, US 8916640B2, US-B2-8916640, US8916640 B2, US8916640B2
Citas de patentes (91), Otras citas (19), Citada por (4), Clasificaciones (22), Eventos legales (3)
US 8916640 B2
a blend dispersion formed from
(A) a first dispersion comprising (i) an ethylene/α-olefin multi-block copolymer having hard segments and soft segments and (ii) a surfactant, the dispersed ethylene/α-olefin multi-block copolymer having an average particle size ranging from 0.1 to 5 microns; and
(B) a second dispersion having a pKa greater than or equal to 10 and comprising an alpha-beta unsaturated carboxylic acid-based polymer, the dispersed alpha-beta unsaturated carboxylic acid-based polymer having an average particle size ranging from 0.02 microns to 1 micron,
wherein the average particle size of (A) is larger than the average particle size of (B).
2. The blended polyolefin dispersion of claim 1, wherein the first or second dispersion further comprises at least one of water, a liquid hydrocarbon, and a water-compatible organic compound.
3. The blended polyolefin dispersion of claim 1, wherein the average particle size of (A) is at least twice the average particle size of (B) by at least 50%.
4. The blended polyolefin dispersion of claim 1, wherein the particles size of (A) is at least ten times larger than the particle size of (B).
5. The blended polyolefin dispersion of claim 1, wherein the number average molecular weight of (A) is larger than the number average molecular weight of (B), as measured by gel permeation chromatography.
6. The blended polyolefin dispersion of claim 1, wherein the number average molecular weight of (A) is at least twice the number average molecular weight of (B), as measured by gel permeation chromatography.
7. The blended polyolefin dispersion of claim 1, wherein the alpha-beta unsaturated carboxylic acid-based polymer comprises at least one of an ethylene-acrylic acid copolymer and an ethylene-methacrylic acid copolymer.
8. The blended polyolefin dispersion of claim 1, wherein the alpha-beta unsaturated carboxylic acid-based polymer is at least partially neutralized.
9. A froth produced from the dispersion of claim 1.
10. A foam produced from the dispersion of claim 1.
11. The blended polyolefin dispersion of claim 1 comprising from 80 wt % to 95 wt % of the first dispersion (A) and from 20 wt % to 5 wt % of the second dispersion (B).
12. The blended polyolefin dispersion of claim 1, wherein the blend dispersion has a pH greater than 7.0.
13. The blended polyolefin dispersion of claim 1, wherein the blend dispersion has a pH greater than 9.0.
14. The blended polyolefin dispersion of claim 1, wherein the dispersed ethylene/α-olefin multi-block copolymer has an average particle size from 0.5 microns to 2.7 microns and the dispersed alpha-beta unsaturated carboxylic acid-based polymer has an average particle size from 0.06 to 1.0 microns.
Embodiments of the blended polyolefin dispersions may be formed where the one or more polyolefin dispersions form the majority dispersion component. In other embodiments, the one or more ethylene-acid copolymer dispersions may form the majority dispersion component. Based on the above description of embodiments of the dispersions, the individual components and embodiments of the dispersions disclosed herein will be described below.
As one suitable type of resin, the esterification products of a di- or poly-carboxylic acid and a diol comprising a diphenol may be used. These resins are illustrated in U.S. Pat. No. 3,590,000, which is incorporated herein by reference. Other specific examples of resins include styrene/methacrylate copolymers, and styrene/butadiene copolymers; suspension polymerized styrene butadienes; polyester resins obtained from the reaction of bisphenol A and propylene oxide followed by the reaction of the resulting product with fumaric acid; and branched polyester resins resulting from the reaction of dimethylterephthalate, 1,3-butanediol, 1,2-propanediol, and pentaerythritol, styrene acrylates, and mixtures thereof. Further, specific embodiments employ ethylene-based polymers, propylene-based polymers, propylene-ethylene copolymers, and styrenic copolymers as one component of a composition.
BI = ∑ ( w i ( BI i - ABI ) 2 ) ( N - 1 ) ∑ w i N
When sulfur based curing agents are employed, accelerators and cure activators may be used as well. Accelerators are used to control the time and/or temperature required for dynamic vulcanization and to improve the properties of the resulting crosslinked article. In one embodiment, a single accelerator or primary accelerator is used. The primary accelerator(s) may be used in total amounts ranging from about 0.5 to about 4, preferably about 0.8 to about 1.5 phr, based on total composition weight. In another embodiment, combinations of a primary and a secondary accelerator might be used with the secondary accelerator being used in smaller amounts, such as from about 0.05 to about 3 phr, in order to activate and to improve the properties of the cured article. Combinations of accelerators generally produce articles having properties that are somewhat better than those produced by use of a single accelerator. In addition, delayed action accelerators may be used which are not affected by normal processing temperatures yet produce a satisfactory cure at ordinary vulcanization temperatures. Vulcanization retarders might also be used. Suitable types of accelerators that may be used in the present invention are amines, disulfides, guanidines, thioureas, thiazoles, thiurams, sulfenamides, dithiocarbamates, and xanthates. Preferably, the primary accelerator is a sulfenamide. If a second accelerator is used, the secondary accelerator is preferably a guanidine, dithiocarbarnate, or thiuram compound. Certain processing aids and cure activators such as stearic acid and ZnO may also be used. When peroxide based curing agents are used, co-activators or coagents may be used in combination therewith. Suitable coagents include trimethylolpropane triacrylate (TMPTA), trimethylolpropane trimethacrylate (TMPTMA), triallyl cyanurate (TAC), and triallyl isocyanurate (TAIC), among others. Use of peroxide crosslinkers and optional coagents used for partial or complete dynamic vulcanization are known in the art and disclosed, for example, in “Peroxide Vulcanization of Elastomer,” Vol. 74, No 3, July-August 2001.
In particular embodiments, it may be desired to utilize the dispersion in the form of foam. When preparing foams, it is often preferred to froth the dispersion. For example, a froth and foam may be prepared as described in WO2005/021622, which is fully incorporated herein by reference. Preferred in the practice of this invention is the use of a gas as a frothing agent. Examples of suitable frothing agents include: gases and/or mixtures of gases such as, air, carbon dioxide, nitrogen, argon, helium, and the like. Particularly preferable is the use of air as a frothing agent. Frothing agents are typically introduced by mechanical introduction of a gas into a liquid to form a froth. This technique is known as mechanical frothing. In preparing a frothed dispersion, it is preferred to mix all components and then blend the air or gas into the mixture, using equipment such as an OAKES, MONDO, or FIRESTONE frother.
The dispersion product is collected directly after the back-pressure regulator, allowed to cool, filtered, and analyzed for particle size, pH, solids content, and viscosity. The aqueous dispersion produced has a solids content of 55 weight percent, a pH of 11.4, and a viscosity (RV-2 spindle, 22.5° C., 100 rpm) of 65 centipoise. The dispersed polymer phase measured by a Coulter LS230 particle analyzer consists of an average volume diameter particle size of 0.6 microns.
Further, the blended dispersions may have properties, resulting from the selected admixture, that are greater extent than the sum of what would be expected when the two are added together or when the same polymers are formed in a single dispersion. Such a synergistic effect may be realized due to the intimate admixture of the various particles in the dispersions, retaining individual characteristics of the component dispersions, but blended so as to intimately commingle with a second particle phase.
The Kit test: the kit value of samples may be determined using TAPPI T559 cm-02. The test was performed flat as described in the TAPPI test. This involves putting five separate drops of oil onto the board's surface and inspecting the board after a specified amount of exposure time (15 seconds) to see if any pronounced darkening of the paper appears. A modified Kit test run at elevated temperature(s) may be useful in analyzing the performance of the deposited blended polyolefin dispersions. Such elevated temperatures for testing can be as high as about 80° C., but preferably tested around 50° C. Film layers made using deposited blended polyolefin dispersions may show higher Kit values at 50° C. than Kit values (also at 50° C.) for random ethylene polymer based deposited dispersions, even at similar overall ethylene polymer density and melt index.
In yet another application, blended polyolefin dispersions may be useful in forming long fiber-reinforced thermoplastic concentrates. Techniques for forming such concentrates are disclosed in co-pending, Ser. No. 60/697,324, which is incorporated by reference in its entirety.
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Clasificación de EE.UU. 524/501, 523/220, 524/522, 523/221, 521/70, 524/523, 524/505
Clasificación internacional C08J9/28, C08J9/00, C08J9/12, C08L23/08, C08J3/02, C09D123/08
Clasificación cooperativa C08J9/0061, C08J9/28, C09D123/0815, C08J9/122, C08J2423/00, C08L23/0869, C08J2323/08, C08J3/02, C08L2666/06