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Title:
LOW-ADHESION COATINGS WITH SOLID-STATE LUBRICANTS
Document Type and Number:
WIPO Patent Application WO/2018/005896
Kind Code:
A4
Abstract:
Some variations provide a low-adhesion coating comprising a continuous matrix containing a first component, a plurality of inclusions containing a second component, and a solid-state lubricant distributed within the coating, wherein one of the first component or the second component is a low-surface-energy polymer, and the other of the first component or the second component is a hygroscopic material. The solid-state lubricant may be selected from graphite, graphene, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, or poly(tetrafluoroethylene) or other fluoropolymers. The solid-state lubricant particles may be coated with a metal selected from cadmium, lead, tin, zinc, copper, nickel, or alloys containing one or more of these metals. The solid-state lubricant is typically characterized by an average particle size from about 0.1 microns to about 500 microns. The solid-state lubricant is preferably distributed throughout the coating.

Inventors:
NOWAK ANDREW (US)
SHERMAN ELENA (US)
GROSS ADAM (US)
Application Number:
PCT/US2017/040153
Publication Date:
May 11, 2018
Filing Date:
June 30, 2017
Export Citation:
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Assignee:
HRL LAB LLC (US)
International Classes:
C09J127/12; C09D127/12; C09J11/04; C09J11/06; C09J11/08
Attorney, Agent or Firm:
O'CONNOR, Ryan (US)
Download PDF:
Claims:
AMENDED CLAIMS

received by the International Bureau on 17 March 2018 (17.03.2018)

1. A low-adhesion composition comprising:

(a) fluoropolymers that are present in the triblock structure:

wherein:

(b) one or more isocyanate species possessing an average isocyanate functionality of about 2 or greater, or a reacted form thereof,

(c) one or more polyol or polyamine chain extenders or crosslinkers possessing an average functionality of about 2 or greater, or a reacted form thereof, and

(d) one or more solid-state lubricants distributed throughout said composition.

2. The low-adhesion composition of claim 1, wherein said solid-state lubricants are selected from the group consisting of graphite, graphene, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, poly(tetrafluoroethylene),

fluoropolymers, and combinations thereof.

3. The low-adhesion composition of claim 1, wherein said solid-state lubricants are particles having outer surfaces containing a metal selected from the group consisting of cadmium, lead, tin, zinc, copper, nickel, and combinations or alloys thereof.

4. The low-adhesion composition of claim 1 , wherein said solid-state lubricants have an average particle size from about 0.1 urn to about 500 um.

5. The low-adhesion composition of claim 1, wherein said solid-state lubricants are distributed uniformly throughout said composition.

6. The low-adhesion composition of claim 1, wherein said fluoropolymers have an average molecular weight from about 1 ,000 g/mol to about 10,000 g/moi.

7. The low-adhesion composition of claim 1 , wherein p is selected from 6 to 50 for each of X and Y.

8. The low-adhesion composition of claim 1, wherein said isocyanate species are selected from the group consisting of4,4'-methylenebis(cyclohexyl isocyanate), hexam ethylene diisocyanate, cycloalkyl-based diisocyanates, tolylene-2,4- diisocyanate, 4,4'-methylenebis(phenyl isocyanate), isophorone diisocyanate, and combinations or derivatives thereof.

9. The low-adhesion composition of claim 1, wherein said polyol or poryamine chain extenders or crosslinkers are selected from the group consisting of 1 ,3- butanediol, 1,4-butanediol, 1,3-propanediol, 1,2-ethanediol, diethytene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tri propylene glycol, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanedhnethanol, ethanol amine, diethanol amine, methyldiethanolamine, phenyldiethanolamine, glycerol, trimethylolpropane, 1,2,6-hexanetriol, triethanolamine, pentaerythritol, ethylenediamine, 1,3-propanediamine, 1,4-butanediamine, diemyftoluenedi amine, d imethytth iotol uenediam ine, isophoronediamine, diaminocyctohexane,

ethylenediamine, and homologues, derivatives, or combinations thereof.

10. The low-adhesion composition of claim 1, wherein said composition contains, in a hard segment, said reacted form of said one or more isocyanate species, combined with said reacted form of said one or more polyol or potyaraine chain extenders or crosslinkers.

1 1. A low-adhesion coating comprising:

(a) a substantially continuous matrix containing a first component;

(b) a plurality of inclusions containing a second component, wherein said inclusions are dispersed within said matrix; and

(c) a solid-state lubricant distributed whhin said matrix and/or within said inclusions,

wherein one of said first component or said second component is a low- surface-energy polymer having a surface energy between about 5 mJ/m2 to about 50 mj/m2, and the other of said first component or said second component is a hygroscopic material.

12. The low-adhesion coating of claim 11, wherein said solid-state lubricant is distributed throughout said coating.

13. The low-adhesion coating of claim 11, wherein said solid-state lubricant is selected from the group consisting of graphite, graphene, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, polyCtetrafluoroethylene),

fluoropolymers, and combinations thereof.

14. The low-adhesion coating of claim 11, wherein said solid-state lubricant is a plurality of particles having outer surfaces containing a metal selected from the group consisting of cadmium, lead, tin, zinc, copper, nickel, and combinations or alloys thereof.

15. The low-adhesion coating of claim 11, wherein said solid-state lubricant is characterized by an average particle size from about 0.1 junto about 500 urn.

16. The low-adhesion coating of claim 1 1 , wherein said polymer is a

fluoropolymer selected from the group consisting of polyfluoroethers, perfhioropolyethers, polyfluoroacrylates, potyfluorosiloxanes, and combinations thereof.

17. Hie low-adhesion coating of claim 16, wherein said fluoropolymer is peril uoropolyether and wherein said hygroscopic material is polyethylene glycol).

18. The low-adhesion coating of claim 16, wherein said hygroscopic material is covalently connected to said fluoropolymer in a tribfock copolymer.

19. The low-adhesion coating of claim 18, wherein said triblock copolymer has the structure:

20. The low-adhesion coating of claim 11, wherein said hygroscopic material is selected from the group consisting of poIy(acrylic acid), polyethylene glycol), poly(2-hydroxyethyl methacrylate), polyvinyl imidazole), po1y(2-methy]-2- oxazoline), po1y(2-ethyl-2-oxazoltne), poly(vinylpyrolklone), cellulose, modified cellulose, carboxym ethyl cellulose, hydroxyethyl cellulose, hydroxypropyi cellulose, methyl cellulose, hydrogels, PEG diacryalate, monoacrylate, and combinations thereof.

21. The low-adhesion coating of claim 11 , wherein said continuous matrix further contains (i) one or more isocyanate species possessing an average isocyanate functionality of about 2 or greater, or a reacted form thereof, and (ii) one or more polyol or polyamine chain extenders or crossl inkers possessing an average functionality of about 2 or greater, or a reacted form thereof.

22. The low-adhesion coating of claim 21, wherein said isocyanate species are selected from the group consisting of 4,4'-methylenebis(cyclohexyl isocyanate), hexam ethylene diisocyanate, cycloalkyl-based diisocyanates, tolylene-2,4- diisocyanate, 4,4'-methylenebis(phenyl isocyanate), isophorone diisocyanate, and combinations or derivatives thereof.

23. The low-adhesion coating of claim 21, wherein said polyol or polyamine chain extenders or crosslink ers are selected from the group consisting of 1 ,3-butanediol, 1,4-butanediol, diethyl ene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tri propylene glycol, neopentyl glycol, ethanol amine, diethanol amine, methyldiethanolamine, phenyldiethanolamine, glycerol, trimethylolpropane,

ethylenediamine,

dimethytthiotoluenediamine, isophoronediamine, diaminocyclohexane,

tetrakis(2-hydroxypropyl) ethylenediamine, and homologues, derivatives, or combinations thereof.

24. The low-adhesion coating of claim 11, said coating further comprising one or more additional components selected from the group consisting of a pigment, a dye, a plasticizer, a flame retardant, a flattening agent, and a substrate adhesion promoter.

25. The low-adhesion coating of claim 11, wherein said coating is characterized by a coefficient of friction less than 0 J measured at 50% humidity and/or a coefficient of friction less than 0.3 measured at 90% humidity.