Elastic gas barrier coating compositions

Patent metadata

Field	Value
Publication number	US-10752806-B2
Application number	US-201514689071-A
Country	US
Kind code	B2
Filing date	Apr 17, 2015
Priority date	Jun 18, 2014
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

An elastic gas barrier coating composition includes a barrier material dispersed in an aqueous media, a polysulfide, and a curing agent reactive with the polysulfide. When applied to a substrate and cured to form a coating, the barrier material forms a continuous phase and a polysulfide elastomer forms a discontinuous phase. An elastic gas coating is also disclosed that includes a continuous phase with a barrier material and a discontinuous phase with a polysulfide elastomer. Substrates at least partially coated with elastic gas barrier coating compositions are further disclosed.

First claim

The invention claimed is:

1. An elastic barrier coating composition comprising:
a barrier material dispersed in an aqueous media;
a liquid polysulfide; and
a curing agent reactive with the liquid polysulfide,
wherein when applied to a substrate and cured to form a coating, the barrier material forms a continuous phase and a polysulfide elastomer is formed as a discontinuous phase,
wherein the elastic barrier coating composition comprises an amount of the barrier material within a range of from 10 weight % to less than 25 weight %, based on the percentage of contained solids in the elastic barrier coating composition, and wherein the barrier material comprises an aqueous polyurethane dispersion, an aqueous polyvinylidene chloride copolymer dispersion, or a combination thereof.

2. The elastic barrier coating composition of claim 1 , wherein the liquid polysulfide comprises mercapto functional groups.

3. The elastic barrier coating composition of claim 1 , wherein the barrier material further comprises an inorganic material.

4. The elastic barrier coating composition of claim 3 , wherein the inorganic material comprises a platy inorganic filler.

5. The elastic barrier coating composition of claim 1 , wherein the liquid polysulfide has a glass transition temperature of less than 0° C.

6. The elastic barrier coating composition of claim 1 , wherein the liquid polysulfide is represented by chemical formula (I):

where R is —(CH 2 —CH 2 —O—CH 2 —O—CH 2 —CH 2 )— and a+b+c+d is a number up to and including 1,000.

7. The elastic barrier coating composition of claim 1 , wherein the curing agent comprises manganese dioxide.

8. The elastic barrier coating composition of claim 1 , wherein the coating composition forms a macroscopically uniform mixture.

9. The elastic barrier coating composition of claim 1 , further comprising a crosslinker reactive with the liquid polysulfide and/or the barrier material.

10. The elastic barrier coating composition of claim 9 , wherein the crosslinker comprises a carbodiimide, an aziridine, or a combination thereof.

11. The elastic barrier coating composition of claim 1 , wherein when applied to a substrate and cured to form a coating, the coating has an elasticity of at least 25% at −40° C. as determined by measuring elongation at break, and a permeance of 51 cc·mm/m 2 ·day·atm at 23° C. as determined in accordance with ASTM method F1927-14.

12. The elastic barrier coating composition of claim 1 , wherein the elastic barrier coating composition comprises an amount of the barrier material within a range of from 10 weight % to 21 weight %, based on the percentage of contained solids in the elastic barrier coating composition.

13. A substrate at least partially coated with the coating composition of claim 1 .

14. The substrate of claim 13 , wherein the coated substrate has an elongation at break of 200% or greater at a temperature of 20° C.

15. The substrate of claim 13 , wherein the substrate comprises an elastic substrate.

16. The substrate of claim 13 , wherein the substrate is a tire.

17. An elastic barrier coating comprising:
a continuous phase comprising a barrier material; and
a discontinuous phase comprising a polysulfide elastomer,
wherein the elastic barrier coating is formed from an elastic barrier coating composition comprising an amount of the barrier material within a range of from 10 weight % to less than 25 weight %, based on the percentage of contained solids in the elastic barrier coating composition, and wherein the barrier material comprises an aqueous polyurethane dispersion, an aqueous polyvinylidene chloride copolymer dispersion, or a combination thereof.

18. The elastic barrier coating of claim 17 , wherein the coating has an elasticity of at least 25% at −40° C. as determined by measuring elongation at break, and a permeance of 51 cc·mm/m 2 ·day·atm at 23° C. as determined in accordance with ASTM method F1927-14.

19. The elastic barrier coating of claim 17 , wherein the barrier material further comprises an inorganic material.

20. The elastic barrier coating of claim 17 , wherein at least one of the following is crosslinked with a crosslinker: the barrier material with itself, the polysulfide elastomer with itself, and the barrier material to the polysulfide.

21. The elastic barrier coating of claim 20 , wherein the crosslinker comprises a carbodiimide, an aziridine, or a combination thereof.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Bowman Mark P
• Keitzer Mark
• Rakiewicz Edward F
• Martin Roxalana L
• Faler Dennis Leroy

Classifications

• C09D181/04 Primary

  Polysulfides · CPC title

• C09D175/04

  Polyurethanes · CPC title

• C08L29/04 Primary

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C09J175/04

  Polyurethanes · CPC title

• C08L81/04

  Polysulfides · CPC title