US 2008/0167440 A1 · Use of copolymerizable sulfonate salts to promote char formation in polyesters and copolyesters

Abstract

comonomers have been shown to improve flammability characteristics of polyesters and copolyesters. Incorporation of sulfonate containing monomers such as 5-sodiosulfoisophthalic acid significantly decreases the heat release capacity of copolyesters. These comonomers also increase the formation of char as measured by thermogravimetric analysis. The decrease in the heat release capacity and increase in char formation indicates that these compositions may have reduced flammability and thus are useful for producing products have reduced flammability. In particular, it has also been demonstrated that incorporation of as little as 0.1 mole % 5-sodiosulfoisophthalic acid to a polyester or copolyester significantly increases the char formation independent of composition.

Claims10

Dependent claims

An article of manufacture, comprising:

a polyester comprising:
(1a) diacid residues having at least 50 mole percent terephthalic acid residues, 1,4-cyclohexanedicarboxylic acid residues or a mixture thereof;
and
(1b) 0.1 to 5 mole % of an alkali metal or phosphonium salt of a sulfonated dicarboxylic acid;
and
(2) diol residues comprising at least 50 mole percent of ethylene glycol residues, cyclohexanedimethanol residues, or a mixture thereof;
wherein the total of the diacid residues is equal to 100 mole percent and the total of the diol residues is equal to 100 mole percent,
the polyester has 0.1 to 2 mole % of the alkali metal or phosphonium salt of a sulfonated dicarboxylic acid,
the article forms char at 600° C. of from 15.7 weight percent to 20.2 weight percent, and
the article is selected from the group consisting of a sheet, a film, a multi-layered sheet, a multi-layer film, a laminated article, an injection molded article, an extruded profile, and a thermo-formed article.

7 more elements

Dependencies are inferred from the claim text.

Use of copolymerizable sulfonate salts to promote char formation in polyesters and copolyesters

Life of this patent

Use of copolymerizable sulfonate salts to promote char formation in polyesters and copolyesters

Life of this patent

Abstract

Claims10