US 11,802,204 B2Granted

Thermoset omniphobic compositions with improved barrier properties, related articles, and related methods

AssigneeBoard of Trustees of Michigan State University

InventorMuhammad Rabnawaz

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Abstract

The disclosure relates to a thermoset omniphobic composition (such as an omniphobic polyurethane or epoxy composition) which includes a thermoset polymer with first, second, and third backbone segments. The first, second, and third backbone segments can correspond to urethane or urea reaction products of polyisocyanate(s), amine-functional omniphobic polymer(s), and polyol(s), respectively, for omniphobic polyurethanes. Similarly, the first, second, and third backbone segments can correspond to urea or beta-hydroxy amine reaction products of polyamine(s), isocyanate-functional omniphobic polymer(s), and polyepoxide(s), respectively, for omniphobic epoxies. The thermoset omniphobic composition has favorable omniphobic properties, for example as characterized by water and/or oil contact and/or sliding angles. The thermoset omniphobic composition further has favorable barrier properties, for example with respect to water vapor and oxygen transmission as well as water absorption. The thermoset omniphobic composition can be used as a coating on any of a variety of substrates to provide omniphobic properties to a surface of the substrate. Such omniphobic coatings can be scratch resistant, ink/paint resistant, and optically clear.

Claims41

Dependent claims

A thermoset omniphobic composition comprising:

a thermoset polymer comprising a crosslinked backbone, the crosslinked backbone comprising:
(i) first backbone segments,
(ii) second backbone segments,
(iii) third backbone segments,
(iv) first linking groups linking the first backbone segments and the third backbone segments, and
(v) second linking groups linking the first backbone segments and the second backbone segments;
wherein:
the first backbone segments have a structure corresponding to a reaction product from at least one first thermosetting component reactive with at least one of a second thermosetting component and a functionalized omniphobic polymer having a glass transition temperature (Tg) of 70° C. or less,
the second backbone segments have a structure corresponding to a reaction product from at least one functionalized omniphobic polymer having a glass transition temperature (Tg) of 70° C. or less, the functionalized omniphobic being reactive with the first thermosetting component,
the third backbone segments have a structure corresponding to a reaction product from at least one second thermosetting component reactive with the first thermosetting component,
the first linking groups have a structure corresponding to a reaction product of a first functional group of the first thermosetting component and a second functional group of the second thermosetting component,
the second linking groups have a structure corresponding to a reaction product of the first functional group of the first thermosetting component and a third functional group of the functionalized omniphobic polymer,
the first functional group, the second functional group, and the third functional group are different from each other,
the first and third functional groups have a higher reaction rate with each other relative to the first and second functional groups with each other,
the thermoset omniphobic composition has a homogeneous structure, and
the second backbone segments are present in an amount ranging from 0.01 wt. % to 20 wt. % relative to the thermoset polymer.

13 more elements

A method for forming a thermoset omniphobic composition, the method comprising:

(a) reacting at a temperature from 20° C. to 150° C. and for a time from 5 min to 300 min (i) at least one first thermosetting component comprising a first functional group reactive with a second thermosetting component comprising a second functional group and a functionalized omniphobic polymer comprising a third functional group and having a glass transition temperature (Tg) of 70° C. or less, (ii) at least one functionalized omniphobic polymer comprising the third functional group and having a glass transition temperature (Tg) of 70° C. or less, and (iii) at least one second thermosetting component comprising the second functional group, to form a partially crosslinked reaction product;
wherein:
the first functional group, the second functional group, and the third functional group are different from each other, and
the first and third functional groups have a higher reaction rate with each other relative to the first and second functional groups with each other;
and
(b) curing the partially crosslinked reaction product to form the thermoset omniphobic composition.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/535,689Filed 8 Aug 2019 · us provisional application
Priority: 10 Aug 2018
Published: US 2020/0048459 A113 Feb 2020
Granted: 31 Oct 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification37 codes

C08L 75/04
Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers: polyurethanes
B05D 3/108
Post-treatment of applied coatings: curing
B05D 5/08
Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures: to obtain an…
C08G 18/10
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step