Char resistant foams
AssigneePolysar International S.A.
InventorsPatrick Oberle, Michel Longuet, David Walker
Life of this patent
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Abstract
The resistance to internal charring of molded styrene-butadiene latex foam rubber when exposed to a lit cigarette is improved by incorporating from about 10 to 30 parts by dry weight, per hundred parts by dry weight of latex of a compound selected from the group consisting of an organic phosphate of the formula ##STR1## wherein R is a C.sub.6-12 alkyl radical or a phenyl radical, which is unsubstituted or substituted by a C.sub.1-4 alkyl radical, butyl benzyl phthalate, and a mixture thereof.
Claims16
A latex composition comprising from about 0 to about 15 parts by dry weight of natural rubber latex and correspondingly from about 100 to about 85 parts by dry weight of styrene-butadiene polymer latex having a styrene:butadiene ratio of from about 20:80 to about 40:60, characterized in that said composition additionally comprises per 100 parts by dry weight of total latex from about 10 to about 30 parts by weight of a compound selected from the group consisting of an organic phosphate of the formula ##STR4## wherin R is a C.sub.6-12 alkyl radical or a phenyl radical which is unsubstituted or substituted by a C.sub.1-4 alkyl radical, butyl benzyl phthalate, and mixtures thereof.
A method of imparting resistance to charring to a molded foam manufactured from a latex comprising from about 0 to about 15 parts by dry weight of natural rubber latex and correspondingly from about 100 to about 85 parts by dry weight of styrene-butadiene polymer latex having a styrene:butadiene ratio of from about 20:80 to about 40:60 which method is characterized by adding to the total latex from about 10 to about 30 parts by weight per 100 parts by dry weight of said total latex of a compound selected from the group consisting of an organic phosphate of the formula ##STR5## wherein R is a C.sub.6-12 alkyl radical or a phenyl radical which is unsubstituted or substituted by a C.sub.1-4 alkyl radical, butyl benzyl phthalate, and mixtures thereof.
Dependencies are inferred from the claim text.