Coated fabric products
View Patent ↗This relates to the coating of air bags, which are used for safety purposes to protect occupants of vehicles such as automobiles, and of air bag fabrics intended to be made into air bags. In particular the invention relates to the top coating of air bags and air bag fabrics which have been pre-coated with a cured organic resin coating composition. The top-coat is an anti-blocking coating composition comprising at least one solid lubricant dispersed in an organic polymer binder. A process for applying the top-coat is also described.
1. An air bag having a cured coating consisting of an organic resin, wherein the air bag is top coated with an anti-blocking coating comprising at least one solid lubricant dispersed in an organic polymer binder, wherein the anti-blocking coating contains a wetting agent comprising a siloxane polyether having 1-3 alkylpoly(ethyleneoxy)siloxane groups (i) and 1 to 4 alkyl-siloxane groups (ii).
2. An air bag having a cured coating comprising an organic resin, wherein the air bag is top coated with an anti-blocking coating comprising at least one solid lubricant dispersed in an organic polymer binder, wherein the anti-blocking coating contains a wetting agent comprising a siloxane polyether having 1-3 alkylpoly(ethyleneoxy)siloxane groups (i) and 1 to 4 alkyl-siloxane groups (ii).
3. An air bag according to claim 2 , wherein the dispersed solid lubricant comprises a fluoropolymer.
4. An air bag according to claim 3 , wherein the dispersed solid lubricant comprises polytetrafluoroethylene.
5. An air bag according to claim 4 , wherein the dispersed solid lubricant comprises talc.
6. An air bag according to claim 3 , wherein the dispersed solid lubricant comprises talc.
7. An air bag according to claim 2 , wherein the dispersed solid lubricant comprises talc.
8. An air bag according to claim 2 , wherein the solid lubricant is dispersed in a polyurethane binder.
9. An air bag according to claim 2 , wherein the anti-blocking coating comprises 3 to 85% solid lubricant on a dry weight basis.
10. An air bag according to claim 2 , wherein the anti-blocking coating contains 5 to 55% by weight aluminum trihydrate as flame retardant.
11. An air bag according to claim 2 , wherein the coating weight of the anti-blocking coating is 1 to 15 g/m 2 on a dry coat weight basis.
12. An air bag according to claim 2 , wherein the dispersed solid lubricant comprises talc, a fluoropolymer, polytetrafluoroethylene, and the solid lubricant is dispersed in a polyurethane binder.
13. A process for coating an air bag or air bag fabric in which the bag or fabric is coated with an organic resin composition, wherein the air bag is top coated with an anti-blocking coating composition comprising an aqueous dispersion of at least one dispersed solid lubricant, wherein the anti-blocking coating composition contains a wetting agent comprising a siloxane polyether having 1-3 alkylpoly(ethyleneoxy)siloxane groups (i) and 1 to 4 alkyl-siloxane groups (ii).
14. A process according to claim 13 , wherein the anti-blocking coating composition comprises a dispersion of a solid fluoropolymer in an aqueous dispersion of an organic polymer binder.
15. A process according to claim 13 , wherein the anti-blocking coating composition comprises a dispersion of talc in an aqueous dispersion of an organic polymer binder.
16. A process according to claim 15 , wherein the organic resin coating comprises a hybrid resin of a urethane polymer blended with an acrylate or vinyl resin, where at least one of the components of the hybrid resin has a glass transition temperature of 20° C. or less.
17. A process according to claim 13 , wherein the organic resin coating comprises a urethane polymer.