Transparent polyester resins and articles therefrom
OwnerHussain Ghatta, Sandro Cobrorinventors
Life of this patent
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Abstract
Compositions suitable for preparing transparent articles comprising an aromatic polyester resin selected from a copolyalkylene terephthalate containing from 3 to 15% by moles of units derived from isophtalic acid and/or a naphthalene dicarboxylic acid and a polyxylylene amide, preferably poly (m.xylylene adipamide), in which the polyamide is dispersed in the polyester resin as domains with average numeral size of 30 to 200 nm. The compositions are obtained by premelt-mixing the polyester with a dianhydride of a tetracarboxylic acid prior mixing the polyxylylene amide using melt viscosity ratio between the polyester resin and the polyxylylene amide higher than 1.5:1, preferably from 3:1 to 8:1.
Claims19
Compositions usable for preparing articles having high transparency comprising an aromatic polyester resin and a polyxylylene amide, in which the said aromatic polyester resin is selected from the group consisting of copolyalkylene terephthalates containing from 3 to 15% by mols of units derived from isophthalic acid and/or naphthalene dicarboxylic acids and the said polyxylylene amide is dispersed in the said aromatic polyester resin matrix as domains having an average particle size from 30 to 180 nm.
7-12. (canceled)
A composition for preparing articles having high transparency comprising (1) a copolyalkylene terephthalate containing monomeric units derived from isophthalic acid and/or naphthalene dicarboxylic acid and (2) a polyxylylene amide, wherein the said polyxylylene amide is dispersed in the copolyalkylene terephthalate matrix as domains having an average particle size from 30 to 180 nm.
Dependencies are inferred from the claim text.