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US 6,641,920 B2Granted
Ultraviolet protected multi-layer structures of copolyester/polycarbonate blends
AssigneeEastman Chemical Company
InventorsRoy Lee Conn, James Carl Williams, John Edward Christopher Willham
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Abstract
There is described an ultraviolet protected multi-layer structure comprising a layer produced from a copolyester/polycarbonate blend, and a protective UV absorbing compound-containing polycarbonate cap layer. Also described is a process for producing the multi-layer structures, and articles of manufacture produced from the multi-layer structures.
Claims10
An ultraviolet protected multi-layer structure comprising:
- an ultraviolet protective layer comprising at least one, or more, ultraviolet absorbing compound and at least one, or more, first polycarbonate;
- and
- a polymeric layer adjacent to the ultraviolet protective layer, the polymeric layer comprising
- a blend comprising
- (A) from about 15 to about 40 weight percent, based on the total blend, of at least one second polycarbonate, and
- (B) from about 60 to about 85 weight percent, based on the total blend, of at least one copolyester comprising
- (a) an acid component comprising from about 65 to about 85 mol percent of a dicarboxylic acid selected from the group consisting of terephthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and mixtures thereof;
- from about 15 to about 35 mol percent isophthalic acid;
- and from about 0 to about 20 mol percent of other dicarboxylic acid units having from about 4 to about 40 carbon atoms, wherein the total mol percent of dicarboxylic acid units is equal to 100 mol percent;
- and
- (b) a glycol component comprising from about 80 to 100 mol percent of 1,4-cyclohexanedimethanol and from 0 to about 20 mol percent of other glycol units having from about 3 to about 12 carbon atoms, wherein the total mol percent of glycol units is equal to 100 mol percent;
- wherein the total units of the copolyester is equal to 200 mol percent.
9 more elements
Dependencies are inferred from the claim text.