Flame retardant elastomer latices
View Patent ↗A non-halogenated elastomeric latex is disclosed, using as flame retardants, an aqueous dispersion of organoclay and a conventional non-halogenated flame retardant, of which less is needed than conventionally, because of the use of the organoclay. The latex can become a film, sheet, or other article.
1. A non-halogenated latex, comprising:
(a) an elastomer latex binder;
(b) a non-halogen flame retardant selected from the group consisting of aluminum trihydrate, magnesium hydroxide, or combinations thereof; and
(c) an organoclay,
wherein the organoclay is an aqueous organoclay dispersion, comprising
(1) an aqueous based carrier and
(2) an organoclay containing a multi-charged spacing/coupling agent comprising a multi-onium ion compound having at least one ammonium ion and at least one oxonium ion.
2. The latex of claim 1 , wherein the elastomer latex binder is selected from the group consisting of elastomers and vulcanizates.
3. The latex of claim 2 , wherein the elastomer latex binder is styrenic.
4. The latex of claim 3 , wherein the elastomer latex is a styrene block copolymer, styrenated acrylic or a styrene-butadiene rubber.
5. The latex of claim 1 , wherein the elastomer has an average particle size ranging from about 10 nm to about 300 micrometers.
6. The latex of claim 1 , wherein the elastomer latex binder has an elastomer solids content ranging from about 20% to about 70%.
7. The latex of claim 1 , wherein the amount of non-halogenated flame retardant in the latex ranges from about 5 parts to about 70 parts per 100 parts of elastomer latex binder.
8. The latex of claim 1 , wherein the organoclay is formed using an intercalant having both amino end groups and carboxylic end groups.
9. The latex of claim 1 , wherein the organoclay is an intercalate which employs an intercalant having the formula:
wherein X + is an ammonium radical,
wherein Y + is an oxonium radical,
wherein R is an alkylene, aralkylene or substituted alkylene charged atom spacing moiety, straight or branched, and mixtures of moieties thereof,
wherein R 1 , R 2 , R 3 , and R 4 are moieties, same or different, selected from the group consisting of hydrogen, alkyl, aralkyl, benzyl, substituted benzyl, ethoxylated or propoxylated alkyl, ethoxylated or propoxylated benzyl, and
wherein Z 1 and Z 2 , same or different, may be non-existent, or may be any of the moieties described for R 1 , R 2 , R 3 or R 4 or one or more positively charged atoms or onium ion molecules.
10. The latex of claim 2 , wherein the elastomer has an average particle size ranging from about 10 nm to about 300 micrometers.
11. The latex of claim 2 , wherein the elastomer latex binder has an elastomer solids content ranging from about 20% to about 70%.
12. The latex of claim 2 , wherein the amount of non-halogenated flame retardant in the latex ranges from about 5 parts to about 70 parts per 100 parts of elastomer latex binder.