Composite flame barrier laminate for a thermal and acoustic insulation blanket
View Patent ↗A multilayer laminate comprising a first polymeric film layer capable of withstanding a temperature of at least 200 C for at least 10 min, a first adhesive layer having an areal weight of from 2 to 40 gsm capable of activation at a temperature of from 75 to 200 degrees C., an inorganic refractory layer, a second adhesive layer having an areal weight of from 4 to 40 gsm capable of activation at a temperature of from 75 to 200 degrees C. and a second polymeric film layer capable of withstanding a temperature of at least 200 C for at least 10 min, wherein at least one of the first or second polymeric film layers is thermoplastic.
1. A multilayer laminate for use as a flame barrier comprising
(i) a first polymeric film layer capable of withstanding a temperature of at least 200 C for at least 10 min,
(ii) a first adhesive layer having an areal weight of from 2 to 40 gsm capable of activation at a temperature of from 75 to 200 degrees C.,
(iii) an inorganic refractory layer,
(iv) a second adhesive layer having an areal weight of from 2 to 40 gsm capable of activation at a temperature of from 75 to 200 degrees C., and
(v) a second polymeric film layer capable of withstanding a temperature of at least 200 C for at least 10 min, wherein at least one of the first or second polymeric film layers is thermoplastic;
wherein the inorganic refractory layer of (iii) comprises platelets in an amount of 100% by weight with a dry areal weight of 15 to 50 gsm and a residual moisture content of no greater than 10 percent by weight.
2. The laminate of claim 1 wherein the inorganic refractory layer comprises vermiculite.
3. The laminate of claim 1 wherein the inorganic refractory layer is perforated.
4. The laminate of claim 3 wherein the adhesive bond between inorganic refractory layer and either polymeric film is at least 1.0 lb/in.
5. The laminate of claim 4 wherein the adhesion bond between inorganic refractory layer and either polymeric film is at least 1.5 lb/in.
6. The laminate of claim 1 wherein the first and second polymeric film layer is a fluoropolymer, polyimide, polyetheretherketone, or polyetherketoneketone.
7. The laminate of claim 1 wherein the first and/or second polymeric film layer is metalized on at least one surface.
8. The laminate of claim 1 wherein either the first or second or both adhesive layers optionally contain up to 40 weight percent of a flame retardant ingredient.
9. The laminate of claim 1 wherein the adhesion bond between the inorganic refractory layer and the first polymeric film is at least 0.5 lb/in.
10. The laminate of claim 9 wherein the adhesion bond between the inorganic refractory layer and the first polymeric film is at least 0.8 lb/in.
11. The laminate of claim 1 wherein the adhesive bond between the inorganic refractory layer and the second polymeric film is at least 0.25 lb/in.
12. The laminate of claim 11 wherein the adhesion bond between the inorganic refractory layer and the second polymeric film is at least 0.8 lb/in.
13. The laminate of claim 1 wherein the inorganic refractory layer has a dry areal weight of from 20 to 35 gsm.
14. The laminate of claim 1 wherein the inorganic refractory layer has a moisture content of no greater than 3%.
15. A flame barrier layer in a vehicle or building structure comprising the multilayer laminate of claim 1 .