Lightweight particles and compositions containing them

Patent metadata

Field	Value
Publication number	US-2018179415-A1
Application number	US-201815896187-A
Country	US
Kind code	A1
Filing date	Feb 14, 2018
Priority date	Aug 13, 2008
Publication date	Jun 28, 2018
Grant date	—

Abstract

Disclosed are particles that have an exterior surface coated with a thin polymeric coating, such as a coating that includes a sulfur-containing polymer. Also disclosed are compositions, such as fuel-resistant sealant and coating compositions, which include such particles. Aerospace vehicles having an aperture at least partially sealed with a sealant deposited from such a sealant composition are also disclosed.

First claim

We claim:

1 . A composition comprising:
(a) a polymeric film-forming binder comprising reactive functional groups; and (b) particles dispersed in the binder, wherein, the particles comprise a coating, wherein the coating comprises an aminoplast resin; the coated particles are characterized by a specific gravity of no more than 0.1; the composition comprises less than 5 wt % of the coated particles, wherein wt % is based on the total weight of the composition; and the composition has a specific gravity of less than 1.0.

2 . The composition of claim 1 , wherein the polymeric film-forming binder comprises a thiol-functional sulfur-containing polymer.

3 . The composition of claim 1 , wherein the polymeric film-forming binder comprises a thiol-functional polythioether.

4 . The composition of claim 1 , wherein the aminoplast resin comprises an aminoplast resin derived from an alkoxyalkyl derivative of melamine, glycouril, benzoguanamine, acetoguanamine, formoguanamine, spiroguanamine, or a combination of any of the foregoing.

5 . The composition of claim 1 , wherein the aminoplast resin comprises a condensation product of an aldehyde and an amino- or amido-group containing substance.

6 . The composition of claim 1 , wherein the aminoplast resin comprises a condensation product of formaldehyde an alkoxyalkyl derivative of melamine.

7 . The composition of claim 1 , wherein the aminoplast resin comprises a (methoxymethyl) melamine-formaldehyde resin, an ethylated-methylated benzoguanimine-formaldehyde resin, an ethylated-methylated melamine-formaldehyde resin, a methylated-butylated melamine-formaldehyde resin, or a combination of any of the foregoing.

8 . The composition of claim 1 , further comprising a curing agent.

9 . The composition of claim 8 , wherein the curing agent comprises a polyepoxide.

10 . The composition of claim 1 , wherein the particles have an average size within a range from 5μm to 300 μm.

11 . The composition of claim 1 , further comprising a reinforcing filler, an adhesion promoter, or a combination thereof.

12 . The composition of claim 11 , wherein the reinforcing filler comprises calcium carbonate.

13 . The composition of claim 11 , wherein the adhesion promoter comprises a silane.

14 . The composition of claim 1 , wherein the particles comprises thermally expanded microcapsules, microspheres, or a combination thereof.

15 . The composition of claim 1 , wherein the composition comprises from 1 wt % to less than 5 wt % of the coated particles, wherein wt % is based on the total weight of the composition.

16 . The composition of claim 1 , wherein the specific gravity of the composition is less than 0.8.

17 . A cured composition prepared from the composition of claim 1 .

18 . The cured composition of claim 17 , having a tensile strength of 1900 mega-Pascals or greater measured according to AS 5127/1a7.7.

19 . The cured composition of claim 17 , wherein the cured composition exhibits:
a percent volume swell of not greater than 40% after immersion for one week at 140° F. (60° C.) and ambient pressure in Jet Reference Fluid Type I; an elongation of at least 80% measured as described in AMS 3269a; and a tensile strength of at least 2000 mega-Pascals when measured according to AS 5127/1a7.7.

20 . An aerospace vehicle, comprising the cured composition of claim 17 .

21 . An aerospace vehicle comprising a surface at least partially sealed with the cured composition of claim 17 .

Assignees

• Ppg Ind Ohio Inc

Inventors

• Anderson Lawrence G
• Szymanski Chester J

Classifications

• C09D163/00

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• C09D181/02 Primary

  Polythioethers; Polythioether-ethers · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C09D179/04

  Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors · CPC title

• C08K9/00 Primary

  Use of pretreated ingredients · CPC title